ISR Performance SR20DET T25 Turbo Replacement - Nissan 240sx

When the stock T25 on an S13 SR20DET gives up, the choice is a used turbo of unknown history or a big upgrade with a big parts list. The ISR Performance RST25 turbo replacement for the Nissan 240SX S13 SR20DET is the middle path: a new, direct replacement turbo that bolts on in place of the factory T25 and gets the car back on the road at a sensible cost.

Turbo Specifications

• Exhaust side: 0.64 A/R turbine housing.
• Estimated output: approximately 275hp and 300tq at 12psi, as demonstrated on a customer's car.
• Complete bolt-on for S13 SR20DET setups.
• Requires a 3AN oil feed line. Do not use a 4AN feed line.
• 6 month manufacturer's defect warranty.

Fitment

Nissan S13 SR20DET. This turbo does not bolt onto an S14 SR20DET setup.

Recommended Supporting Parts

For a smooth installation on the S13, ISR recommends pairing the RST25 with:

• ISR turbo line kit
• GT drain setup, or modify the stock drain
• ISR turbine outlet O2 housing

Who Should Buy It

This is the turbo for someone dealing with a failed stock turbo, or someone who wants a modest bump over factory output with reliable, affordable hardware, without committing to a full big turbo build. With the 0.64 A/R housing it keeps the quick spool character of the factory T25 while delivering more than the stock unit. Check oil feed restrictor and drain routing carefully before first start, and verify the 3AN feed line requirement is met.

All ISR Performance products are designed for off-road use only.