TNT5R Race Turbo Guide

The True North Turbos TNT5R line is Black Sheep Industries' big-frame answer to the demands of class-limited drag racing in North America. Built in Canada with in-house designed compressor and turbine wheels, every TNT5R turbo features a T6 turbine inlet, a billet compressor wheel, and a construction philosophy rooted in what class racers actually need: dialled sizing, relevant bearing options, and turbine housing choices that align with sanctioning-body constraints — not just a horsepower number on a spec sheet.

This guide covers everything you need to evaluate, compare, and select the right TNT5R drag racing turbocharger for your combination: compressor sizes from 88 mm through 106 mm, ball-bearing and journal-bearing configurations, open and dual v-band turbine housings from 1.12 through 1.41 A/R, X275-specific variants, twin-turbo applications, and links to every active product in the line.

TNT5R Big-Frame Race Turbos at a Glance

The TNT5R series is a Canadian-manufactured big-frame drag racing turbocharger line built specifically for the demands of X275, no-prep, and other class-limited applications. Where most competitors publish a per-model horsepower rating and call it a selection guide, True North Turbos takes a different approach: compressor size, bearing choice, and turbine housing A/R are the filters, and they are selected against the racer's actual combination, class rules, and airflow targets.

The series spans four compressor-wheel families — 88 mm, 94 mm, 98 mm, and 106 mm billet — all sharing the T6 turbine inlet bolt pattern that is standard in serious drag racing applications. Compressor and turbine wheels are designed in-house, not sourced from third-party suppliers. As a series, the TNT5R range covers capability starting at approximately 1,600 HP in single-turbo applications and extending to 4,500+ HP in twin configurations. Individual models within the line carry no published horsepower ratings; capability is properly expressed through compressor size, airflow potential, bearing type, and race-class fit.

Browse all TNT5R race turbos →

Who the TNT5R Line Is Built For

The TNT5R line is built for racers who are selecting a turbo around class rules, target airflow, spool characteristics, engine displacement, and the packaging realities of a purpose-built drag car. These are not decisions that a horsepower chart can make for you.

Common use cases include X275 racing, where wheel-size and housing restrictions define what is legal before any performance discussion begins; no-prep builds, where spool time and traction management interact directly with compressor and housing choice; single-turbo gas and diesel drag applications, where the combination may be constrained by class rules or physical space; and high-output twin-turbo combinations at the upper end of the series range.

Regardless of application, final turbo selection should be grounded in the vehicle, the engine combination, the race class, and the supporting components — not compressor diameter alone. A racer choosing between an 88 mm and a 94 mm needs to know their class restrictions, exhaust-side configuration, and intended operating range before that decision is meaningful. This guide helps structure that process.

TNT5R Core Specifications

Every turbo in the TNT5R line is built around one of four billet compressor-wheel families: 88 mm, 94 mm, 98 mm, and 106 mm. These compressor inducer sizes serve as the primary selection filter for the entire line, establishing the airflow range and top-end capability appropriate for a given combination.

All TNT5R turbos share a T6 bolt-pattern turbine inlet — the standard used across serious drag racing hardware and compatible with T6-flanged exhaust manifolds common in class racing. Turbine and compressor wheels are designed in-house by True North Turbos.

Two bearing cartridge paths are available across the line: the ball-bearing (BB) configuration and the journal-bearing (JB) configuration. BB units use a billet-aluminium centre section; JB units use a cast-steel centre section. These paths are covered in detail in the bearing section below.

On the turbine housing side, TNT5R turbos are available in open and dual v-band configurations. Open housings are offered in 1.12, 1.24, and 1.40 A/R; dual v-band housings in 1.15, 1.22, and 1.41 A/R. Housing selection is addressed in its own section, including how to work through A/R choice for your specific application.

Choose Your TNT5R Compressor Size: 88 mm to 106 mm

Compressor inducer size is the primary starting point for any TNT5R selection. Before bearing type, before turbine housing A/R, you need to establish which compressor family puts your combination in the right airflow territory — and that calculation has to account for class restrictions, not just engine displacement or power ambition.

The general principle is straightforward: a larger compressor wheel moves more air and supports greater top-end flow potential, while a smaller compressor wheel tends to come up to boost sooner in the rpm or time-distance curve. But this relationship is not linear, and it does not operate in isolation. Available traction, the turbine housing you pair with it, your exhaust-side configuration, and any compressor-wheel size limits in your class can all shift the correct answer. Racers should balance required airflow and top-end performance against spool response, available traction, engine displacement, and class rules — not treat compressor size as a standalone variable.

No horsepower ratings are assigned to individual models. Compressor size, airflow potential, bearing choice, and race-class fit are the correct selection filters.

88 mm Turbo Options for X275 and No-Prep

The 88 mm turbo family is the smallest compressor-size offering in the TNT5R big-frame line, and it is also the family most directly aligned with class-limited racing — specifically X275 and comparable no-prep categories where compressor-wheel or housing restrictions apply.

Within the 88 mm family, the line includes two X275-specific configurations: the BB 88 X275 and the JB 88 X275. These variants are built around the X275-specific 112/102 turbine wheel and housing combination, which is designed to align with wheel-size or housing restrictions common in X275 and structured no-prep classes. Whether the BB or JB path makes more sense for a given racer's combination depends on their bearing priorities — covered in the section below — but both variants start from the same class-focused turbine specification.

Racers considering either of these configurations for a class-legal build should treat this section as a starting point for comparison, not confirmation of eligibility. Sanctioning-body rules vary across promoters and can change between seasons.

Publication note: Verify current X275 and no-prep class rule wording — including compressor-wheel, turbine-wheel, and housing specifications — with your class organiser before making a purchasing decision based on class compliance.

94 mm Turbo Options

The 94 mm turbo family is the next compressor-size step for racers whose airflow targets and top-end requirements move beyond what the 88 mm path is designed to support. This is a common choice for drag racing combinations where the engine displacement, camshaft profile, and exhaust-side setup call for greater peak airflow capability, and where class rules do not restrict the racer to a smaller wheel.

Selecting the 94 mm as your compressor family opens the same bearing-type and turbine-housing decision paths available across the TNT5R line. After compressor size, the next meaningful filter is BB versus JB bearing cartridge — a choice driven by your priorities around spool response, centre-section construction, cost, and race format. Turbine housing A/R selection follows from there.

View available 94 mm TNT5R variants →

98 mm Turbo Options

The 98 mm turbo family addresses larger-airflow race combinations — builds where displacement, cylinder count, boost target, or the requirements of a twin-turbo system call for a compressor wheel that the 94 mm family cannot efficiently serve.

Twin-turbo applications are a relevant context here. When paired turbos are matched at the 98 mm level, turbine housing selection becomes particularly important: consistent housing A/R across both units helps achieve balanced system response and avoids the kind of asymmetric spool behaviour that can create tuning headaches on an already-complex twin setup. Matching compressor size and turbine housing A/R — and bearing type where practical — is a starting principle for twin configurations at any compressor size, but it becomes more consequential as airflow demands and system complexity increase.

As with all TNT5R sizes, the 98 mm selection should be tied to engine displacement, intended operating range, packaging constraints, and class regulations — not a generic target power level.

View available 98 mm TNT5R variants →

106 mm Turbo Options

The 106 mm turbo is the largest listed compressor-size family in the TNT5R line. It is appropriate for applications where a racer's airflow needs, class rules, and build requirements together support the maximum available compressor size — typically larger-displacement engines in open or lightly restricted classes where top-end flow potential is the dominant priority.

Racers should not assume 106 mm eligibility in X275 or similarly restricted classes. If your class imposes compressor-wheel size limits, confirm those limits against the 106 mm specification with your organiser before selection.

View available 106 mm TNT5R variants →

Ball Bearing vs Journal Bearing Race Turbos

Once you have identified your compressor-size family, bearing type is the next meaningful decision. Bearing selection refines your priorities around spool response, centre-section construction, cost, and durability — it does not override compressor sizing, and it does not replace proper turbine housing selection. Think of it as the second filter in a sequential process.

The TNT5R line offers two bearing cartridge paths: ball bearing (BB) and journal bearing (JB). The construction distinction is clear: BB units are built around a billet-aluminium centre section; JB units use a cast-steel centre section. Both paths are available across the TNT5R compressor-size families. The right choice depends on your specific combination, race format, and where you place your priorities — response, durability, or cost.

A ball bearing race turbo is not universally superior to a journal-bearing unit, and a journal-bearing turbo is not simply a compromise version of a BB. Each configuration serves a defined set of priorities, and the better choice is the one that matches your race application and build requirements.

Ball Bearing (BB) TNT5R Turbos

BB TNT5R models are designed for the fastest spool response within the line. The billet-aluminium centre section is a differentiating construction feature — lighter and manufactured to tighter tolerances than a cast alternative — contributing to the response characteristics that make BB turbos the choice for racers where getting on boost quickly is the highest priority in their combination.

If your race format, track surface, and combination reward aggressive early spool — whether in X275, no-prep, or a single-turbo diesel drag application — the BB path is worth prioritising. The construction quality is there; the question is whether your build actually needs and can use what the BB centre section offers.

Shop ball-bearing TNT5R turbos →

Journal Bearing (JB) TNT5R Turbos

JB TNT5R models offer a lower-cost bearing path without abandoning the race-focused design of the TNT5R line. The cast-steel centre section is well suited to sustained high-load operation — the kind of abuse that comes with repeated hard passes, extended warm-up cycles, or applications where the turbo sees consistent thermal and mechanical stress.

Racers weighing their full build budget or operating in a format where sustained durability matters alongside peak response will find the JB configuration a genuinely competitive choice, not a default fallback. Cost and durability are legitimate race priorities, and the JB path is designed around both.

Shop journal-bearing TNT5R turbos →

Bearing Choice Checklist

Before committing to a bearing type, work through these priority questions:

• Is the fastest possible spool response the highest priority in your combination? If yes, the BB path is the starting point.
• Is budget a meaningful constraint alongside race-use requirements? If yes, the JB path offers a lower-cost entry into the TNT5R line without sacrificing the T6 race turbo architecture.
• Will your turbo see sustained high-load operation — repeated hard passes, extended run-in cycles, or high thermal exposure? The cast-steel JB centre section is designed with that tolerance in mind.
• What does your race format reward? A no-prep racer managing traction on a degraded surface may prioritise different response characteristics than an X275 car dialled in on a prepped strip.
• What are your overall build requirements? Bearing type is one decision in a sequence that starts with compressor size and ends with turbine housing A/R.

Bearing choice does not replace proper compressor sizing or turbine housing selection. If you are uncertain which path suits your combination, submit your build details through the turbo spec form rather than defaulting to one configuration based on general advice.

Submit your combination for fitment support →

T6 Race Turbo Housing Options and A/R Selection

Every turbo in the TNT5R line is a T6 race turbo: the T6 bolt-pattern turbine inlet is standard across the entire series, making it compatible with the T6-flanged exhaust manifolds common in serious drag racing hardware. Housing selection is the final variable in the sequential selection process — it comes after compressor size and bearing type, and it should always be evaluated against the engine's exhaust-flow requirements, desired spool characteristics, and any class-specific restrictions on housing configuration.

A/R (area-to-radius ratio) describes the turbine housing's cross-sectional geometry relative to the scroll centreline. A lower A/R produces tighter scroll geometry that accelerates exhaust gas velocity earlier, favouring quicker spool at the cost of some peak-flow efficiency. A higher A/R opens the scroll geometry for greater exhaust-side flow capacity, supporting top-end performance at the cost of a somewhat later spool point. The right A/R for your TNT5R is not a universal answer — it depends on displacement, camshaft and head flow characteristics, boost target, intended operating range, and class restrictions.

Housing selection should follow your compressor size, engine combination, race class, and intended use. If you have not yet worked through compressor sizing and bearing choice, start there.

Open T6 Turbine Housings

Open turbine housings are available in 1.12, 1.24, and 1.40 A/R across the TNT5R line. These three steps give racers a practical range from tighter, response-focused geometry to broader, peak-flow-oriented configurations.

The 1.12 A/R is the tightest option in the open-housing range — the appropriate choice when the engine combination, class restrictions, or traction conditions place a premium on getting on boost quickly, and where peak exhaust-flow capacity is a secondary concern. The 1.24 A/R occupies the middle of the open-housing range, suitable for combinations where the response-versus-top-end balance is more evenly weighted. The 1.40 A/R is the largest open-housing option, appropriate for larger-displacement or higher-revving combinations where exhaust-flow capacity at peak operating conditions is the dominant consideration.

Class rules and vehicle packaging can both influence housing choice independent of airflow considerations. If your class restricts housing configuration or if physical clearance in the engine bay limits your options, those constraints should enter the selection process before A/R preference.

Racers unsure which open-housing A/R suits their combination should submit their full build details rather than defaulting to a middle-of-the-range selection without supporting analysis. Get housing fitment help →

Dual V-Band T6 Turbine Housings

Dual v-band housings retain the TNT5R line's standard T6 turbine inlet configuration while adding v-band discharge couplings at both the turbine inlet and outlet. Available A/R options are 1.15, 1.22, and 1.41 A/R — a range comparable to the open-housing family, though the specific steps differ slightly.

The decision to run dual v-band is as much a packaging and system-design consideration as it is an A/R choice. V-band connections can simplify exhaust routing in tight engine bays, support quicker turbo service intervals on race cars that see regular maintenance between events, and offer a cleaner connection approach in custom exhaust fabrication. These are genuine advantages in certain build contexts, not merely cosmetic differences.

As with open housings, the appropriate A/R within the dual v-band range depends on the engine combination, operating range, and desired response characteristics. If you are building a twin-turbo application, matching both turbos to the same A/R within the dual v-band family is an important baseline for achieving even system response.

Outlet, discharge, and flange dimensions beyond the confirmed T6 inlet bolt pattern are not published here. Verify fitment-specific dimensions with Black Sheep Industries before fabricating exhaust or discharge connections.

How to Select a TNT5R Turbine Housing A/R

Work through housing A/R selection in this order:

1. Start with your compressor size and the engine's expected airflow demand. The compressor family you have already selected sets the context for how much exhaust energy the turbine side needs to handle.
2. Refine around desired spool behaviour versus peak-flow requirement. A lower A/R supports earlier spool; a higher A/R supports greater peak-flow capacity. Where your combination actually operates — and where it needs to be on boost — drives this trade-off.
3. Account for race-class restrictions. Some X275 and no-prep classes specify or restrict housing configurations. Confirm what is permitted in your class before selecting an A/R.
4. Include exhaust-side configuration and vehicle packaging. Manifold design, collector positioning, downpipe routing, and available clearance all interact with housing choice in ways that can override a purely performance-based A/R selection.
5. Confirm the selected housing against current regulations where X275 or no-prep class compliance is part of the build requirement.

If this process surfaces uncertainty — particularly around compressor-housing interaction, class regulations, or exhaust-side configuration — submit your combination through the spec form before ordering. Request TNT5R selection support →

X275 Turbo Configurations and Class-Limited Racing

For racers building around X275 class rules, the TNT5R line offers specific configurations purpose-built for the compressor-wheel and housing parameters common in this class. The x275 turbo discussion cannot be separated from the class context: the defining characteristic of an X275-targeted build is not the power level or the compressor diameter in isolation — it is the combination of compressor wheel, turbine wheel, and housing specification that either meets or falls outside class restrictions.

TNT5R's X275-specific offerings are the BB 88 X275 and JB 88 X275 configurations. Both are built around the X275-specific 112/102 turbine wheel and housing combination — a purpose-built turbine specification that addresses the wheel-size and housing parameters that are commonly relevant in X275 and structured no-prep classes. These are not general 88 mm variants with a class label attached; the turbine specification is the defining feature.

Racers in X275 and comparable no-prep categories evaluate these configurations specifically because the turbine wheel and housing are spec'd for the constraints of those classes. That said, no configuration in the TNT5R line — including the BB 88 X275 and JB 88 X275 — should be purchased on the assumption of universal class legality. Rules vary by sanctioning body and event organiser, and they change. Verification is mandatory before ordering.

BB 88 X275 and JB 88 X275 Options

The two X275 product paths differ by bearing cartridge and centre-section construction, not turbine specification. Both share the 112/102 turbine wheel and housing combination that defines the X275 variant; the choice between them is a bearing decision.

The BB 88 X275 prioritises fastest spool response within the X275-compatible configuration. The billet-aluminium centre section and ball-bearing cartridge are appropriate for racers whose combination rewards aggressive early spool and who are prepared to invest accordingly in the centre-section specification.

The JB 88 X275 offers the same X275-targeted turbine specification at a lower cost of entry, with a cast-steel centre section suited to sustained high-load operation. Racers weighing the bearing decision alongside class budget constraints or formats that place a premium on durability over repeated events will find the JB path a legitimate choice — not a compromise.

Both configurations should be compared against current class restrictions at the time of purchase. Bearing type is a secondary consideration relative to confirming that the turbine wheel and housing specification aligns with what your class organiser currently enforces.

Shop BB 88 X275 →
Shop JB 88 X275 →

Confirm X275 and No-Prep Rules Before Ordering

This is not a formality. X275 and no-prep class rules — including compressor-wheel diameter, turbine-wheel specifications, housing restrictions, and related parameters — vary between sanctioning bodies and event promoters, and they are revised periodically. What was legal last season may not be this season, and what is legal at one event may not carry over to another.

Before purchasing any TNT5R configuration for a class-limited application, confirm the following with your class organiser:

• Maximum allowable compressor-wheel inducer diameter
• Turbine-wheel size restrictions, if any
• Housing configuration or A/R restrictions
• Any additional applicable technical requirements

Black Sheep Industries does not make universal class-legality claims for any TNT5R product. If you need help evaluating a specific configuration against your current class rules, submit your combination and class details through the spec form and the team can assist in the review.

Submit your combination for class review →

No-Prep Turbo Selection: Spool, Traction, and Top-End

No-prep drag racing presents a distinct turbo selection challenge: you are balancing spool time and top-end airflow potential against traction conditions that can vary lane-to-lane, pass-to-pass, and event-to-event. A no prep turbo setup that works beautifully on a fresh surface can become a wheel-speed problem on a degraded one, and the turbo choices that contribute to that outcome — compressor size, housing A/R, bearing type — all interact with one another in ways that a generic selection guide cannot capture.

Start with compressor size as your initial filter, then use bearing type and turbine housing A/R as refinements. Compressor size sets the airflow range; housing A/R shapes the spool-versus-peak-flow trade-off; bearing type refines response within the selected compressor and housing combination. Working through this sequence with your actual build details — not a target horsepower number — produces a meaningfully more useful starting point than any turbo-diameter-to-power chart.

There is no single best housing or turbo size for no-prep racing without full build details. Anyone offering one is skipping the combination variables that actually determine whether a turbo choice works on a degraded surface.

Prioritise the Complete Combination

No-prep turbo selection is a whole-combination exercise. Engine displacement and camshaft profile determine the airflow demand range your compressor needs to operate within efficiently. Target boost level and exhaust-side setup — manifold design, collector size, exhaust volume — define how the turbine housing needs to handle exhaust energy to meet spool and top-end targets. Intended race conditions, including surface prep and expected 60-foot strategy, influence how aggressively you can actually use early boost without wheel-speed penalties.

Class restrictions, where they apply, define the boundary conditions before any performance discussion begins. No-prep is not always an unrestricted class; many no-prep events operate under turbo sizing rules that are as specific as X275, and some share the same technical parameters.

Packaging constraints — firewall clearance, intercooler placement, downpipe routing — can also influence whether a single-turbo or twin-turbo setup is physically viable in your specific chassis, independent of what the combination might theoretically support.

Forum-reported combinations are a useful starting point for understanding what other racers have run in similar configurations, but they should not replace build-specific selection. A combination that worked for someone else's engine, tune, and chassis may behave entirely differently in yours.

Avoid Generic Horsepower-Based Turbo Matching

The TNT5R selection process is deliberately different from the horsepower-claim approach used by most competitors in the big-frame turbo market. Precision, Garrett, Forced Inductions, and Work Turbochargers all publish per-model horsepower ratings; the TNT5R line does not. That is not a marketing gap — it is a principled position.

Horsepower-based turbo matching is imprecise in the best case and misleading in the worst. The actual airflow behaviour of a turbo depends on compressor map efficiency, turbine housing A/R, bearing response characteristics, and the engine combination it is matched to. Attaching a power number to a compressor diameter and calling that selection guidance obscures the decision-making process rather than supporting it.

Black Sheep Industries assesses compressor size against airflow potential, bearing choice against response and durability priorities, housing A/R against exhaust-flow matching, and race-class fit against current regulations. The approved capability framing for the TNT5R series — approximately 1,600 HP at the single-turbo entry point through 4,500+ HP in twin applications — describes the series range, not a rating assigned to any individual model. Using that framing as a selection tool is not the intent; it establishes the scale of the line in a context that racers understand.

This approach, paired with build-specific review through the turbo spec form, produces selections that are actually defensible — which is more useful to a racer than a confidence-inspiring number that may not reflect their combination.

Single vs Twin TNT5R Turbo Applications

Single and twin turbo configurations should both be selected around the engine combination, class rules, packaging, spool goals, and target airflow — not around a compressor-size label or a generic power ambition. The TNT5R line supports both applications, and the selection logic is the same either way: compressor size first, then bearing type, then turbine housing A/R, evaluated against the specific combination.

Single-turbo setups are common across gas and diesel drag builds where class rules limit the available configuration, where packaging constraints make a twin setup impractical, or where the build strategy favours the simplicity and response characteristics of a single large-frame turbo. Twin configurations extend the upper end of the series range — the 4,500+ HP series-capability framing reflects twin-application potential — and are appropriate where the complete combination requires total airflow capacity beyond what a single compressor family can efficiently support.

Neither configuration is inherently superior. Prescribing a single or twin layout based only on compressor-size preference misses the point. The right answer depends on the build.

When a Single T6 Race Turbo Makes Sense

A single-turbo TNT5R setup makes sense in a wide range of race combinations: class-limited applications where twin turbo is not permitted, chassis configurations where packaging physically constrains the exhaust and inlet routing to a single-turbo layout, and build strategies where the simplicity, tuning predictability, and cost efficiency of a single unit are part of the design intent.

Diesel drag racing is a natural single-turbo application within the TNT5R range — large-displacement diesel engines produce exhaust volume well-suited to driving a single big-frame T6 race turbo, and many diesel drag classes operate under single-turbo rules. Gas drag applications at the single-turbo level are similarly common, particularly in class-limited categories or builds where the engine combination has not outgrown the upper end of what a single TNT5R compressor family can support.

In all single-turbo applications, compressor size, bearing type, and turbine housing A/R still need to be selected against the full combination. A single setup does not simplify those decisions — it focuses them on one turbo rather than two.

Submit your single-turbo combination for fitment review →

Planning a Twin-Turbo Combination

Twin TNT5R arrangements are appropriate where the complete combination — engine displacement, target airflow, operating range, and class permissions — requires greater total airflow capacity than a single compressor family can efficiently serve. The 4,500+ HP series-capability framing applies at the twin-application level of the range; individual turbo models within that arrangement do not carry ratings derived from that framing.

The key principle in twin-turbo planning is matching. Paired turbos should be matched on compressor size, bearing type, and turbine housing A/R. Mismatched housing A/Rs between two turbos in a twin setup create asymmetric spool behaviour that complicates tuning and can produce uneven cylinder loading across the engine. Matched configurations are not a guarantee of even system response — manifold design, exhaust routing, and cylinder-bank characteristics all contribute — but matched turbo specification is the baseline from which a balanced system can be built.

When planning a twin setup, also account for the physical realities: available space for two turbos, two intercooler circuits or a shared core, downpipe routing, and the exhaust manifold design required to drive two T6-flanged housings efficiently. These packaging considerations can influence the housing type — open versus dual v-band — and the A/R selection as much as the airflow targets do.

Submit your twin-turbo combination for fitment support →

Shop the TNT5R Race Turbo Line

The TNT5R line comprises ten active products spanning four compressor-size families, two bearing cartridge paths, and two X275-specific variants. The sections below organise the full lineup by compressor size and bearing type, with dedicated links for each configuration. Use the canonical collection as your browse-all destination and the bearing-type collections when you have already narrowed to a BB or JB preference.

Do not treat product-page specifications as a substitute for proper selection — individual product pages contain configuration details, but the selection guidance in this document establishes the process that should precede a product-page review.

Browse All TNT5R Turbos

The canonical TNT5R collection is the central destination for comparing the complete lineup side by side:

Browse all TNT5R race turbos →

When filtering the collection, start with compressor size — 88 mm, 94 mm, 98 mm, or 106 mm — then apply bearing type (BB or JB) and confirm X275 variant availability if your class requires it. Housing options are addressed on individual product pages.

Shop by Bearing Type

If you have already determined your bearing preference, the bearing-specific collections provide a direct path to the relevant TNT5R products:

Shop ball-bearing TNT5R turbos →
The BB collection includes all TNT5R configurations built around the billet-aluminium centre section. Choose this path if spool response is the highest priority in your combination.

Shop journal-bearing TNT5R turbos →
The JB collection includes all TNT5R configurations built around the cast-steel centre section. Choose this path if lower cost, sustained high-load durability, or a combination of both is the priority.

Shop by Compressor Size and Race Class

88 mm TNT5R Turbos

• TNT5R BB 88 →
• TNT5R JB 88 →

88 mm X275 Variants

• TNT5R BB 88 X275 →
• TNT5R JB 88 X275 →

The X275-specific variants include the 112/102 turbine wheel and housing combination. Confirm current class rules before ordering.

94 mm TNT5R Turbos

• TNT5R BB 94 →
• TNT5R JB 94 →

98 mm TNT5R Turbos

• TNT5R BB 98 →
• TNT5R JB 98 →

106 mm TNT5R Turbos

• TNT5R BB 106 →
• TNT5R JB 106 →

Need Help Choosing a TNT5R Turbo?

The selection process outlined in this guide — compressor size, bearing type, turbine housing A/R, class rule verification — covers the sequential logic, but it assumes you have the build information needed to work through it. If you are still unsure which TNT5R configuration suits your combination after reviewing the guide, the right next step is to submit your build details for a combination-specific review.

Before reaching out or submitting a spec form, have the following information ready:

• Engine displacement and configuration (cubic inches / litres, cylinder count, fuel type)
• Race class and sanctioning body (X275, no-prep, diesel bracket, open class, etc.)
• Current or intended exhaust setup (manifold type, collector size, T6 flange availability)
• Target use (class racing, testing, dual use)
• Packaging considerations (known clearance constraints, single vs twin layout)
• Current supporting components that may influence turbo choice (intercooler, wastegate, boost controller)

The more complete your combination details, the more useful the selection support will be. Generic requests without build context will always produce less precise guidance than a properly detailed combination submission.

Final selection should account for current class rules and the full vehicle combination, not compressor diameter or bearing type alone.

Submit Your Turbo Combination

Get TNT5R turbo selection help →

Submit your build details through the turbo specification form. Include your race class, engine combination, exhaust configuration, and packaging notes. The team at Black Sheep Industries reviews combination submissions and can help you identify the right compressor size, bearing type, and housing A/R for your application.

Relying on forum recommendations or generic online charts — even well-intentioned ones — is not a substitute for a build-specific review. Combinations vary too much for generic advice to be reliably applied.

Canadian Orders and Cross-Border Considerations

Black Sheep Industries is a Canadian manufacturer and supplier. The TNT5R line is priced in Canadian dollars (CAD), and current store policy covers US duties for orders shipping across the border — meaning US-based racers can order without factoring in additional duty costs on top of the listed price.

For full details on pricing, shipping, duties, and cross-border ordering, refer to the store's current shipping and ordering information. Policies are maintained at the site level and may be updated; the version on the site at the time of your order governs.

View shipping and ordering information →

TNT5R X275 Turbo FAQ

What size turbo is used for X275 racing?

X275 racing typically involves compressor-wheel and turbine-wheel size restrictions that define the upper limit of what is permitted in class. Within the TNT5R line, the BB 88 X275 and JB 88 X275 configurations are specifically built around the X275-relevant 112/102 turbine wheel and housing combination. Whether these configurations are legal for your specific class depends on current rule wording from your sanctioning body or event organiser — confirm before ordering. If your event runs an open or less restrictive no-prep format, other compressor-size families in the TNT5R line may also be appropriate; start with the selection process outlined in this guide.

What is the difference between a ball bearing and journal bearing race turbo?

The primary difference is in centre-section construction and the resulting response characteristics. TNT5R ball-bearing (BB) units use a billet-aluminium centre section and are designed for the fastest spool response within the line. Journal-bearing (JB) units use a cast-steel centre section, offer a lower cost of entry, and are designed to handle sustained high-load operation. Neither configuration is universally superior; the right choice depends on your race format, combination, and priorities around response, durability, and budget.

How do I choose a T6 turbine housing A/R?

Start with your compressor family and the engine's exhaust-flow requirements. Lower A/R values — 1.12 in the open-housing range, 1.15 in the dual v-band range — prioritise quicker spool by accelerating exhaust gas velocity sooner. Higher A/R values — 1.40 and 1.41 at the top of each respective range — prioritise peak-flow capacity at the expense of some early spool response. Refine the selection around your desired operating range, class restrictions, exhaust manifold configuration, and packaging constraints. If those variables produce a clear answer, proceed; if not, submit your combination through the spec form for a build-specific housing recommendation.

Should I run a single or twin turbo for no-prep racing?

That depends on your engine combination, class rules, packaging, and total airflow targets. Single-turbo setups are appropriate where class rules, physical constraints, or build strategy favour one turbo; twin setups extend the series' total airflow capacity for combinations that have outgrown what a single compressor family can efficiently support. There is no universal answer without build context. If your class permits twin turbos and your combination benefits from greater total airflow, the TNT5R line supports both paths. Use the spec form if you are weighing the two configurations for your specific build.

Are TNT5R X275 turbos legal for my class?

Black Sheep Industries does not make universal class-legality claims for any TNT5R product, including the X275-specific variants. Class rules — including compressor-wheel, turbine-wheel, and housing specifications — vary between sanctioning bodies and event promoters, and are revised periodically. The BB 88 X275 and JB 88 X275 are built around the 112/102 turbine wheel and housing combination that is commonly relevant to X275-class restrictions, but whether they are legal for your specific event requires confirmation from your class organiser. Verify current rule wording before ordering.