S480 Turbo Guide: 80 mm S400 Specs, Fitment & Power Range

If you are searching for an S480 turbo, you are already thinking about serious horsepower — the kind that demands competition-grade fuel systems, structural engine hardware, and a built transmission before you ever hit the throttle. The S480 is an 80 mm compressor turbocharger built on the BorgWarner S400 frame, and it occupies a meaningful position in the large-frame diesel performance world: bigger than anything in the S300 series, smaller than the S500 class, and right at home in high-horsepower drag and truck-pulling builds where sustained boost at the top end matters more than snappy low-rpm spool. This guide covers every verified specification, fitment measurement, and configuration decision you need to build confidently around an S480 — including the specs that most competitors leave off the page entirely.

What Is an S480 Turbo?

An S480 turbo is an S400-frame turbocharger with an 80 mm compressor inducer. That is the entire meaning of the designation: the "S4" identifies the BorgWarner S400 series frame, and the "80" identifies the compressor inducer diameter in millimetres. Nothing in the name specifies the turbine wheel, the turbine housing, or the A/R ratio — those are build-specific decisions made separately.

Understanding this naming convention is important because the aftermarket is full of S480-labelled listings that vary considerably in turbine sizing, trim values, blade counts, and materials. When someone references a Borg Warner S480, they are invoking the S400 family's established frame architecture, but the individual configuration details still require confirmation before ordering anything downstream — housings, drains, clamps, or exhaust components.

Within the S400 large-frame family, the S480 sits in the upper-middle of the high-horsepower lineup. It is a meaningful step up from S300-frame options in terms of flow capacity, and it leaves room above it for the S483 and S485. Think of it as the entry point into competition-grade 80 mm turbo territory: capable of outputs that exceed what most performance street builds will ever need, but not the ceiling of what the S400 frame can produce.

S480 Turbo Specs: Compressor, Turbine & Common Wheel Combos

Getting S480 turbo specs right at the beginning of a build prevents expensive mismatches later. The compressor inducer is the fixed reference point; everything else — exducer size, turbine pairing, housing, and A/R — is selected to match the application.

Core S480 Compressor Spec

The defining measurement of any S480 is the 80 mm compressor inducer. This is the inlet eye of the compressor wheel, and it sets the fundamental flow ceiling and spool character of the turbo.

Common compressor exducer sizes paired with this 80 mm inducer are 96 mm and 103 mm. The exducer influences the compressor map shape, affecting where peak efficiency falls and how aggressively the wheel moves air at the top of its range. Blade counts, trim values, and billet versus cast material specifications vary by manufacturer — True North Turbos, BorgWarner distributors, and clone producers each take different approaches — and these details are not standardised across all S480 listings. If a particular spec matters to your build, confirm it directly with the supplier rather than assuming it matches another product you have seen.

As a plain-language reference point: when builders talk about an 80mm turbo in the S400 frame, this is the turbo they are describing.

Common Turbine Wheel Pairings

Turbine wheel selection is build-specific and is not automatically determined by the S480 name. The two most commonly paired turbine exducer sizes in S480 configurations are 88 mm and 92 mm. The 88 mm is the more common pairing with the 96 mm compressor exducer, while the 92 mm appears more frequently alongside the 103 mm compressor exducer.

Turbine sizing affects how quickly the wheel accelerates under exhaust energy and how efficiently it transfers that energy at the top end of a pull or pass. A larger turbine exducer moves more gas at peak flow but requires more exhaust energy to initiate acceleration. On a high-horsepower competition diesel where exhaust energy is abundant, this is generally an acceptable trade-off.

Avoid assuming that any S480 listing shares universal turbine specifications. The turbine wheel is one of the most consequential variables in the build, and it deserves the same verification as the compressor specs.

Most Common S480 Wheel Combinations

Two wheel combinations appear most frequently across aftermarket S480 offerings:

Compressor Exducer	Turbine Exducer	Typical Use Context
96 mm	88 mm	High-HP diesel competition, moderate peak flow
103 mm	92 mm	Maximum peak flow, sustained high-boost competition

These are the pairings you will encounter most often when configuring an S480 turbo, but they are not the only options in existence. Housing A/R is selected independently of wheel sizing and is addressed in the turbine housing section below.

S480 Turbo Horsepower Range & Required Supporting Mods

Realistic Horsepower Range

S480 turbo horsepower potential, as cited by Black Sheep Industries, falls in the range of 1,230–1,405 HP at the crank. The TNT480 80 mm T6 product specifically is rated at 1,345–1,405 HP, placing it at the upper end of the S480 power band.

These are not numbers associated with a mildly modified truck. They represent competition-level output that requires a purpose-built engine, a supporting fuel system capable of delivering at this level, and drivetrain components that will not fail under sustained stress. If your build target is a four-digit dyno number in this range, the S480 is appropriately sized. If your target is 600–800 HP, this turbo is the wrong tool.

Required Supporting Modifications

At the horsepower levels the S480 is designed to produce, certain supporting modifications are not optional upgrades — they are prerequisites for reliable operation. Running an 80 mm turbo into an otherwise stock or mildly modified engine is a path to rapid component failure.

Fuel system: Injectors, lift pump, high-pressure pump, and fuel tuning must all be capable of delivering at the power level you are targeting. The turbo cannot produce usable horsepower that the fuel system cannot support, and attempting to push beyond fuel system limits creates dangerous combustion conditions.

Head studs: Factory head bolts are not designed for the cylinder pressures generated at 1,200-plus horsepower. Upgraded head studs are a structural requirement, not a precaution.

Built transmission: Stock transmissions are not rated for the torque loads produced at this power level. A transmission built for competition use — with upgraded clutch packs, converter, and valve body — is required before the engine sees full boost.

The power potential of any S480 build depends on the complete system: turbo, fuel, tuning, engine structure, and drivetrain. The turbo alone does not determine the number on the dyno sheet — but it does set the ceiling that everything else must be built to reach.

S480 T6 Turbine Housing & A/R Selection

Why T6 Is Common on S480 Builds

S480 turbos are most frequently configured with T6 turbine housings, and there is a straightforward reason for it. The S480's larger compressor and turbine wheels demand a turbine inlet that can flow enough exhaust gas to drive the wheel efficiently at high output. The T6 bolt pattern offers a larger inlet area than T4, and for high-horsepower drag and truck-pulling applications where sustained elevated boost is the goal, that flow capacity is meaningful.

To be clear on terminology: T4 and T6 refer to the turbine inlet flange bolt pattern — the interface between the exhaust manifold and the turbine housing. A T6 inlet means a T6 bolt pattern at that junction. The outlet configuration is a separate consideration addressed in the marmon section below.

T4-flanged S480 housings exist and are used in some builds, but T6 is the predominant choice for the power levels this turbo targets.

Recommended S480 A/R Range

For most S480 T6 applications, a turbine housing A/R in the 1.25–1.45 range is appropriate. Selecting within this range is an application-specific decision with real trade-offs on either side.

A smaller A/R (towards 1.25) tightens the housing scroll, which accelerates exhaust gas velocity and improves spool response. The downside is reduced flow capacity at the top end, which can become a ceiling on peak power in builds where the engine is held at high RPM for an extended run.

A larger A/R (towards 1.45) opens the scroll for maximum top-end flow, which is the preferred configuration for long-course sled pulls or top-speed-oriented drag builds where sustained boost at high RPM is more important than how quickly boost builds at the start. The trade-off is slower low-RPM response.

There is no universal "correct" A/R for an S480. The right choice depends on engine displacement, intended RPM range, track or course length, and how the full combination is tuned. If you are unsure, discuss the application specifics with your turbo supplier before committing to a housing.

S400 T6 Outlet & Marmon Fitment

The S400 T6 turbine housing exhausts through a 146 mm (5.75") full marmon outlet. The corresponding marmon clamp is 99502-0588. If you are planning an S480 T6 installation and already have an existing exhaust system, verify that it terminates in a 5.75" marmon before assuming compatibility.

For reference, the S400 T4 turbine housing uses a smaller 117 mm (4.62") half marmon outlet — a different clamp and a different exhaust interface entirely. These two outlet configurations are not interchangeable, and confusing them during the planning stage creates fitment problems that are expensive to resolve after parts have been ordered.

Marmon outlet compatibility is one of the details that forum threads and generic turbo listings consistently skip over. Confirm your outlet size, clamp part number, and exhaust system compatibility before finalising the housing selection.

S480 Spool, Streetability & Best-Fit Applications

Spool Trade-Off Compared With S475 and S476

The S480 spools more slowly than the S475 or S476, and this characteristic is fundamental to understanding where it fits in a build plan. Larger compressor and turbine wheels require more exhaust energy to accelerate to operating speed, which means boost builds later in the RPM range. The payoff is greater peak flow capacity at the top end — but the low-RPM response is sacrificed to get there.

The exact spool delta between an S480 and an S476 on any given engine is application-dependent. Engine displacement, exhaust manifold design, back pressure, and tune all affect how quickly the turbo comes on. What can be stated clearly is that anyone moving from an S476 to an S480 should expect a noticeable shift in boost onset timing, and their tune and driving strategy should reflect that.

Where an S480 Makes Sense

The S480 is purpose-built for competition applications where peak flow and sustained high boost matter more than quick spool. Its best-fit use cases are:

• Serious drag racing where the engine is at operating RPM by the time maximum boost is needed.
• Truck and tractor pulling where a sustained, high-boost run is required across the length of the track.
• Competition diesel builds on any platform where the full combination — fuel, engine, trans, and tune — is built to match.

Common platforms for S480 builds include heavy-duty Cummins, Duramax, and Power Stroke diesels converted for competition use. These engines have the displacement and exhaust energy to drive the larger wheel combination effectively.

Street use or towing with an S480 is uncommon precisely because of the spool characteristics described above. A turbo this size in stop-and-go traffic or moderate towing conditions will spend most of its time below its efficient operating range. There are better tools for those applications.

S480 Turbo Cummins Placement

For builders running an S480 turbo on a Cummins platform, the application context is almost always competition: sled pull trucks, drag trucks, and dedicated dyno builds where the 5.9 or 6.7 has been extensively modified to support four-digit horsepower.

The Cummins engine family is well-represented in the high-horsepower diesel competition world, and the S480 shows up regularly in purpose-built Cummins competition trucks. However, "S480 turbo Cummins" is not a bolt-on description — it implies a full build that includes appropriate fuel system upgrades, head studs, a built transmission, and chassis-specific fitment planning. Drain length clearance in particular is worth planning carefully in common Cummins chassis, where tight engine bays can make the longer drain length options relevant.

S400 Fitment Details: Oil Drain, Bolt Centre & Drain Length

Fitment details for the S400 frame are precise enough that small measurement errors create real problems. The measurements in this section are exact and should be treated as such.

S400 Oil Drain Bolt Centre

The S400 large-frame oil drain uses a bolt centre of 50.8 mm (2.00"). This is the centre-to-centre distance between the two drain flange bolt holes, and it is the measurement used when sourcing or fabricating a drain flange.

The critical warning here: mid-frame turbos — a separate frame class, not an S400 variant — use a 50 mm (1.97") bolt centre, a difference of only 0.8 mm (~1/32"). These two flanges look nearly identical, and the difference is imperceptible without measurement. If you are fabricating a custom flange or sourcing a drain adapter, measure with calipers. Do not assume by eye, and do not assume a mid-frame flange will seat on an S400 just because the numbers look close on paper.

Throughout this guide and any related BSI documentation, the correct term for this measurement is bolt centre. It is not a bolt circle and it is not a bolt pattern — those terms apply to different interface types and using them interchangeably creates confusion when sourcing parts.

S480 Oil Drain Port Size

The S400 large-frame centre housing requires a 12AN drain port. This is not a preference or a best-practice suggestion — it is a fitment requirement.

A 10AN fitting is undersized for an S400 and should not be used. Running an undersized drain creates backpressure in the oil return circuit, which leads to oil pooling in the centre housing, seal stress, and eventually bearing failure. This is a reliability issue that shows up in forum threads regularly, and it is entirely avoidable by using the correct port size from the start.

If you are sourcing drain components, confirm 12AN compatibility before purchasing. The extra few minutes of verification is considerably cheaper than a failed bearing mid-pass.

Drain Length Options

Drain length is an independent specification that has no relationship to bolt centre or port size. It is purely a clearance consideration based on where the drain flange exits the turbo centre housing relative to the oil pan or return fitting on the engine.

BSI offers drain length options at:

• 35 mm (1.38")
• 65 mm (2.56")
• 100 mm (3.94")

In tight chassis installations — which are common in competition trucks with heavily modified engine bays — the 100 mm option may conflict with surrounding components. Builders using common Cummins chassis configurations have flagged this as a planning item worth checking before the turbo goes on the engine. Map the drain path in your chassis before selecting a length.

Terminology Note: Bolt Centre vs Bolt Pattern

To avoid ordering errors and miscommunications with fabricators:

• Use bolt centre when referring to oil drain flanges. This is the centre-to-centre measurement between two bolt holes on a two-bolt drain flange.
• Use bolt pattern when referring to T4 or T6 turbine inlet flanges, inlet gaskets, and turbine housings. These are multi-bolt circular arrangements where "pattern" is the appropriate descriptor.

Most competitor content treats these terms as interchangeable. They are not, and using the wrong term when describing an oil drain dimension or a turbine housing interface creates real confusion in the ordering and fabrication process.

S480 vs S483, S485 & Other Large S400 Options

S480 vs S483 and S485

The S480 is not the largest compressor the S400 frame accommodates. The S483 and S485 both use larger inducers — 83 mm and 85 mm respectively — and are positioned above the S480 in flow capacity.

Both the S483 and S485 target power levels beyond the 1,405 HP mark, making them the appropriate choice when a build has genuinely exceeded what the S480 can support at the compressor. The exact power delta between an S480 and an S483 or S485 on a given engine is builder-specific and dependent on the full combination — there is no universal dyno figure that cleanly separates them. What is clear is that the progression from 80 mm to 83 mm to 85 mm inducer is a meaningful increase in potential peak flow, with corresponding increases in the turbine and fuel system requirements needed to support that flow.

If your build is approaching or exceeding the 1,405 HP ceiling and your fuel system, engine, and transmission are already built to that level, the S483 or S485 becomes the next conversation. For most competition builds targeting this range, the S480 — and specifically the TNT480 — is appropriately sized.

S480 vs S488 Keyword Handling

For shoppers comparing s480 vs s488: before drawing conclusions about power differences or spool characteristics between these two designations, verify the compressor inducer size, turbine wheel, housing A/R, and any available dyno data for the specific products you are comparing. The "S488" designation is not universally standardised across all aftermarket manufacturers, and direct power or spool comparisons between specific products require confirmed, matching specifications rather than assumed performance from the designation alone. This page focuses on verified S480, S483, and S485 research — for S488 details, consult the manufacturer directly with specific product data in hand.

TNT480 80 mm T6: BSI's S480-Mapped Product

How the TNT480 Relates to the S480 Turbo Page

This supporting guide maps directly to the live TNT480 80 mm T6 product from Black Sheep Industries. The TNT480 is BSI's S480-class offering: an 80 mm S400-frame turbocharger configured with a T6 turbine housing and rated at 1,345–1,405 HP.

Everything covered in this guide — compressor sizing, turbine housing selection, A/R range, fitment measurements, and supporting mod requirements — applies directly to the TNT480 as a real, purchasable product. The horsepower rating sits at the upper end of the S480 range, consistent with a T6 housing and a competition-grade wheel combination. Before ordering, confirm that your fuel system, head studs, transmission, and chassis fitment are all aligned with what this turbo demands.

Shopify Product CTA

Ready to configure the TNT480 for your build? View the TNT480 80 mm T6 product page to confirm specifications, select your configuration options, and order with confidence.

Black Sheep Industries is a Canadian store with CAD pricing and a buying experience built for Canadian customers. US duties are covered, so cross-border buyers are not left navigating unexpected charges after the fact. If you have build-specific questions before ordering, reach out directly — the team understands competition diesel builds and can help confirm fitment before anything ships.

Placement Under the S400 Pillar

This S480 page sits within the broader S400 turbo education pillar on the BSI site. If you are still working through frame sizing, turbine housing selection, or large-frame turbo fundamentals, the S400 pillar page covers those topics with the same level of detail applied here.

To be clear on what this page has and has not determined: the S480 designation confirms an 80 mm compressor in the S400 frame. It does not automatically determine turbine wheel size, housing A/R, or drain configuration. Those decisions must still be confirmed for your specific build before ordering any supporting components.

S480 Buyer Checklist Before Ordering

Use this checklist as a pre-order confirmation tool. Every item here corresponds to a build decision or measurement that, if wrong, creates problems after the turbo is in hand.

Build Readiness Checklist

• Confirm your horsepower goal falls within the S480-appropriate range (1,230–1,405 HP)
• Fuel system is upgraded: injectors, lift pump, high-pressure pump, and tuning are all capable at target power
• Head studs are installed — factory head bolts are not adequate at this power level
• Transmission is built for competition use — a stock automatic or manual is not appropriate
• Use case is confirmed as competition-focused: drag racing, truck pulling, or sustained high-boost competition

Turbo Configuration Checklist

• Compressor/turbine wheel combination confirmed: 96 mm / 88 mm or 103 mm / 92 mm — verify with supplier
• T6 turbine housing confirmed as appropriate for the application
• A/R selected within the 1.25–1.45 range based on RPM range, track length, and tune
• T6 marmon outlet compatibility verified: 146 mm (5.75") full marmon, clamp 99502-0588

Fitment Checklist

• Oil drain bolt centre measured with calipers and confirmed as 50.8 mm (2.00") — not assumed
• Drain port confirmed as 12AN — 10AN is undersized and should not be used
• Drain length selected based on chassis clearance: 35 mm (1.38"), 65 mm (2.56"), or 100 mm (3.94")
• Exhaust system verified for 146 mm (5.75") full marmon outlet compatibility

S480 Turbo FAQ

What size turbo is an S480?

An S480 is an S400-frame turbocharger with an 80 mm compressor inducer. The designation tells you the frame family (S400) and the compressor inducer diameter (80 mm). It does not specify the turbine wheel, turbine housing, or A/R — those are selected separately based on the build.

How much horsepower can an S480 turbo make?

BSI cites a realistic crank horsepower range of 1,230–1,405 HP for S480-class builds. The TNT480 80 mm T6 product is specifically rated at 1,345–1,405 HP. These are competition-level outputs that require upgraded fuel systems, head studs, and a built transmission to achieve reliably. They are not numbers available from a modified stock engine.

Is an S480 turbo streetable?

Street use is uncommon with an S480. The larger compressor and turbine wheels spool more slowly than smaller S400 options like the S475 or S476, which means boost builds late in the RPM range. In stop-and-go traffic or moderate towing conditions, the turbo operates below its efficient range most of the time. The S480 is optimised for competition applications where high RPM and sustained boost are achievable and expected.

What A/R should I run on an S480 T6?

The recommended A/R range for most S480 T6 applications is 1.25–1.45. Smaller values within that range (towards 1.25) improve spool at the cost of top-end flow; larger values (towards 1.45) maximise top-end flow at the cost of low-RPM response. The right choice depends on your engine, RPM range, course or track length, and tune. There is no single universal answer.

What oil drain size does an S480 need?

The S400 large-frame centre housing requires a 12AN drain port. A 10AN fitting is undersized for an S400 and will create oil backpressure issues that can lead to seal failure and bearing damage. Additionally, confirm the oil drain bolt centre is 50.8 mm (2.00") — not 50 mm, which is the mid-frame dimension. The difference is only 0.8 mm (~1/32"), so measure with calipers rather than estimating by eye.

This guide covers verified S480 specifications and Black Sheep Industries fitment data. For TNT480 product configuration and pricing, visit the TNT480 80 mm T6 product page. For broader S400 frame education, see the S400 turbo pillar.