Turbo Spec Form
True North Turbos TNT5R JB 106mm T6
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The TNT5R JB 106mm is the flagship of the journal bearing line — the largest compressor in the TNT5R range, with 112x102 or 114x108 turbine housing options behind it. It shares its compressor covers, compressor wheels, and turbine design with the ball-bearing series, on a cast steel center section rated to 74,000 RPM.
Despite the wheel size, the supercore weighs just 25lbs — under 65lbs with the largest T6 turbine housing attached. Oil the platform properly: -6 feed, -12 drain, no restrictor, or premature shaft and thrust wear will lead to failure.
Key Specs
- 106mm 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: 74,000
- Available in 112x102 or 114x108 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 106mm with a restrictor will cause premature shaft and thrust wear leading to failure. It requires a -6 feed and a -12 drain.