The TNT55 JB 94mm is the middle step in the journal bearing TNT55 range — more compressor than the 88 for combinations that need the airflow, while holding the same 85,000 RPM shaft speed ceiling. It shares its compressor covers, compressor wheels, and turbine design with the ball-bearing series, on a cast steel center section.

Supercore weight is just 25lbs — under 65lbs with the largest T6 turbine housing attached. Feed it right: -6 feed and -12 drain, never a restrictor, which causes premature shaft and thrust wear leading to failure.

Key Specs

• 94mm 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 94mm with a restrictor will cause premature shaft and thrust wear leading to failure. It requires a -6 feed and a -12 drain.