Turbo Spec Form
True North Turbos TNT5R JB 88mm X275 T6 112/102 Turbine
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Built for X275 class racing, this TNT5R JB pairs the 88mm compressor with the class-spec 112/102 turbine — the journal bearing route to a legal combination without giving up the TNT5R's compressor covers, wheels, or turbine design, all shared with the ball-bearing series on a cast steel center section.
The supercore weighs just 25lbs and stays under 65lbs with the largest T6 turbine housing attached. Run it on a -6 feed and -12 drain with no restrictor — a restricted feed causes premature shaft and thrust wear leading to failure.
Key Specs
- 88mm compressor wheel with X275 112/102 turbine, journal bearing, cast steel center section
- Requires -6 feed and -12 drain — no restrictor
- Supercore weight: 25lbs; under 65lbs with largest T6 turbine housing
- Max operating RPM: 80,000
- Available in 112x102 T6 turbine housing, multiple A/R options
- Built to order
Frequently Asked Questions
What's the difference between the JB and BB TNT5R?
The JB (journal bearing) TNT5R uses a cast steel center section, versus the billet aluminum center section on the BB (ball bearing) version. Both share the same compressor covers, compressor wheels, and turbine design.
Can I run this turbo with a restrictor?
No. Running the TNT5R JB 88mm X275 with a restrictor will cause premature shaft and thrust wear leading to failure. It requires a -6 feed and a -12 drain.