JDM RWD /// platform file
Toyota Supra Mk4 Turbo build guide
2JZ-GTE · 3.0 twin-turbo I6. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Toyota Supra Mk4 Turbo makes 320 hp stock at roughly 3,400 lb (10.6 lb/hp). Its stock internals are good for about 800 hp, the fuel system for around 450 hp, and the stock turbo(s) flow about 420 hp. Below is the limit sheet carbuildcheck analyzes against, plus the platform's documented weak points.
01 Factory card
Stock power320 hp
Curb weight3,400 lb · 10.6 lb/hp
LayoutRWD
InductionTurbocharged
02 What stock parts support
Engine internals~800 hp
Fuel system~450 hp
Induction ceiling~420 hp
Clutch (manual)~380 hp
Transmission (auto/DCT)~650 hp
Cooling (sustained)~460 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
JDM-spec ceramic turbine wheels can let go past stock boost — export/steel-wheel turbos are the safe baseline.
Single-turbo territory: plan a metal head gasket and ARP studs with the kit, not after it lifts.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85, driveline before sticky tires.
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