JDM RWD /// platform file
Nissan 240SX / Silvia build guide
SR20DET · 2.0 turbo I4. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Nissan 240SX / Silvia makes 250 hp stock at roughly 2,800 lb (11.2 lb/hp). Its stock internals are good for about 420 hp, the fuel system for around 320 hp, and the stock turbo(s) flow about 300 hp. Below is the limit sheet carbuildcheck analyzes against, plus the platform's documented weak points.
01 Factory card
Stock power250 hp
Curb weight2,800 lb · 11.2 lb/hp
LayoutRWD
InductionTurbocharged
02 What stock parts support
Engine internals~420 hp
Fuel system~320 hp
Induction ceiling~300 hp
Clutch (manual)~280 hp
Transmission (auto/DCT)~350 hp
Cooling (sustained)~330 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
SR rocker arms pop under boost spikes — rocker arm stoppers and clean boost control before big turbo pulls.
Most SRs are 30 years old and tired. Compression + leak-down test before you spend a dollar on power.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85, driveline before sticky tires.
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