USA AWD /// platform file
Ford Focus RS (Mk3) build guide
EcoBoost · 2.3 turbo I4. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Ford Focus RS (Mk3) makes 350 hp stock at roughly 3,450 lb (9.9 lb/hp). Its stock internals are good for about 460 hp, the fuel system for around 430 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 power350 hp
Curb weight3,450 lb · 9.9 lb/hp
LayoutAWD
InductionTurbocharged
02 What stock parts support
Engine internals~460 hp
Fuel system~430 hp
Induction ceiling~420 hp
Clutch (manual)~380 hp
Transmission (auto/DCT)~420 hp
Cooling (sustained)~420 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
Early cars had a head-gasket recall — verify the fix is documented before tuning on top of it.
The rear drive unit overheats and derates to FWD on long sessions. Cool-down laps or an RDU cooler.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85, driveline before sticky tires.
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