ISR Performance RS3871 Turbo - Nissan SR20DET

Our RS3871 is a compact bolt-on upgrade turbo for the SR20DET, rated up to around 380hp. It's the budget-friendly path to real top-end power over the factory T25/T28 without jumping into the deep end of a full custom build.

What It Does

Replaces the factory turbo with a larger compressor and exhaust housing for more airflow and meaningfully more top-end power. It still spools cleanly on a 1.8L to 2.2L four-cylinder, so daily drivability stays intact. The 0.64 A/R turbine housing is the right balance for street and drift use, and the compact form factor keeps weight down compared to bigger factory-style options.

Fitment

Designed for the Nissan SR20DET, and suitable for any 1.8L to 2.2L four-cylinder application where the flange and supporting hardware work out. Requires a 3AN oil feed line. Not compatible with 4AN feed lines.

Supporting Parts to Plan For

To do a proper bolt-on install, plan on the following:

• 90-degree 2.00" to 2.25" coupler (for the hot pipe)
• ISR intake kit (SR20DET S13 or Z32 MAF, depending on your build)
• 45-degree 3.00" to 2.75" coupler (for the intake kit)
• ISR turbo line kit (chassis-specific, top-mount or bottom-mount)
• ISR turbine outlet O2 housing
• Larger injectors (sized for your fuel and boost target)
• Upgraded fuel pump
• ECU retune or standalone ECU

Product Details

Brand: ISR Performance

Part Number: IS-RS3871

Type: Bolt-On Upgrade Turbocharger

Vehicle Fitment: Nissan SR20DET (1.8L-2.2L four-cylinder)

Compressor Inlet: 3"

Turbine Housing A/R: 0.64

Power Rating: Up to ~380hp

Oil Feed: 3AN required (NOT 4AN compatible)

Sold: Individually

Legality: Off-road and competition use only