AUS RWD /// platform file
Ford AU Falcon XR6 Turbo build guide
Barra · 4.0 turbo I6. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Ford AU Falcon XR6 Turbo makes 360 hp stock at roughly 3,900 lb (10.8 lb/hp). Its stock internals are good for about 900 hp, the fuel system for around 480 hp, and the stock turbo(s) flow about 450 hp. Below is the limit sheet carbuildcheck analyzes against, plus the platform's documented weak points.
01 Factory card
Stock power360 hp
Curb weight3,900 lb · 10.8 lb/hp
LayoutRWD
InductionTurbocharged
02 What stock parts support
Engine internals~900 hp
Fuel system~480 hp
Induction ceiling~450 hp
Clutch (manual)~400 hp
Transmission (auto/DCT)~500 hp
Cooling (sustained)~500 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
Valve springs are the Barra’s first fuse — they drop cylinders before anything else breaks. Springs with the first big tune.
Oil pump gears are the next known weak point at serious power. The bottom end itself is legendary.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85, driveline before sticky tires.
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