Built for X275 class racing, this TNT55 JB pairs the 88mm compressor with the class-spec 112/102 turbine — the journal bearing route to a legal combination without giving up the TNT55'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 TNT55?

The JB (journal bearing) TNT55 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 TNT55 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.