This 400 chassis journal bearing turbo is capable of 1400-1520hp on your average sub-6.0L pushrod V8, and the same 85mm frame is equally at home on LS and big-block swaps, import six-cylinder builds, and high-performance diesel trucks.

Featuring our newest 85mm compressor wheel designed by us, as well as our 96x88 turbine wheel. This turbine wheel is the result of extensive research over the past few years to help alleviate some of the backpressure associated with maxing out the standard BW 96x88 design.

The 85mm sits just below the 88mm at the top of the range, trading a little peak airflow for slightly earlier response — a good pick if the 88 feels like more turbo than your combination can light.

Key Specs

• 85mm compressor wheel, journal bearing
• 96x88 turbine wheel
• T4 flange, 1.25 A/R
• Rated 1400-1520hp on sub-6.0L pushrod V8 applications
• Built to order

Replaces / Cross-Reference

The TNT485 is a direct bolt-on replacement for S483 and S485 turbochargers and other 85mm S400-frame units. Built on the same 400 frame, it uses the mounting hardware you already have:

• Turbine inlet: T4 — fits your existing T4 manifold
• Turbine discharge: 4.62" (117mm) half marmon — same flange and clamp
• Compressor discharge: V-band, sized to your charge pipe
• Oil drain: 50.8mm (2.00") bolt centre, 12AN port — same drain

Full model mapping: S400 replacement cross-reference. Housing selection: A/R guide.

Frequently Asked Questions

Is the TNT485 a direct replacement for an S485?

Yes. The TNT485 is built on the 400 frame, so it is a direct bolt-on replacement for S483 and S485 turbochargers. Your T4 manifold, half marmon downpipe flange, clamp, compressor discharge and 12AN oil drain all carry over.

What is the TNT485 T4 1.25 rated for?

1400-1520hp on your average sub-6.0L pushrod V8, using our 96x88 turbine wheel on a T4 1.25 A/R flange. The same frame is used across gas, import and diesel builds.

Should I run the 85mm or the 88mm?

The 88mm has a slightly higher airflow ceiling; the 85mm responds marginally earlier. If your combination struggles to light an 88, the 85 is the safer pick.

Is this turbo built to order?

Yes. Every TNT485 is built to order.

Power ratings on this page are quoted in crank horsepower (HP). Figures previously published in wheel horsepower (WHP) have been restated using our in-house tested conversion — the hardware and its capability are unchanged.

BorgWarner and S400 are trademarks of BorgWarner Inc. Black Sheep Industries Inc. and True North Turbos are not affiliated with or endorsed by BorgWarner Inc. Model designations are used for identification and fitment reference only.