The TNT55 JB 88mm is the entry point to the journal bearing side of the TNT55 line — the same compressor covers, compressor wheels, and turbine design as the ball-bearing series, on a cast steel center section that brings the platform in at a lower price without touching its aero.

As a supercore the unit weighs just 25lbs, and stays under 65lbs with the largest T6 turbine housing attached. The oil system is non-negotiable: -6 feed, -12 drain, no restrictor — running one causes premature shaft and thrust wear leading to failure.

Key Specs

• 88mm compressor wheel, 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: 85,000
• 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 with a restrictor will cause premature shaft and thrust wear leading to failure. It requires a -6 feed and a -12 drain.