EURO AWD /// platform file
Audi S4 / S5 (B8) build guide
3.0 TFSI supercharged V6. What the stock hardware reliably supports, where it breaks first, and the fastest safe path to more.
The Audi S4 / S5 (B8) makes 333 hp stock at roughly 3,900 lb (11.7 lb/hp). Its stock internals are good for about 550 hp, the fuel system for around 460 hp, and the stock supercharger setup supports about 480 hp. Below is the limit sheet carbuildcheck analyzes against, plus the platform's documented weak points.
01 Factory card
Stock power333 hp
Curb weight3,900 lb · 11.7 lb/hp
LayoutAWD
InductionSupercharged
02 What stock parts support
Engine internals~550 hp
Fuel system~460 hp
Induction ceiling~480 hp
Clutch (manual)~400 hp
Transmission (auto/DCT)~480 hp
Cooling (sustained)~450 hp
Community-documented crank-hp planning figures, conservative by design. How these are used in the score →
03 Where it breaks first
The blower runs out of efficiency up here. Dual pulley plus cooling is the honest ceiling on stock hardware.
Direct-injection carbon buildup is a when-not-if service. Walnut blast before chasing misfires.
04 The typical path
Tune → pulley → fueling. Blower cars scale fast; heat and fuel are the guardrails.
Analyze your S4 / S5 (B8) build
Tap your mods, set a goal. Score, weak link, roadmap. Free, no login.
Check this build →
05 Related platform files