Ford AU Falcon XR6 Turbo (FG / FG X, Barra 270T) build guide
Barra · 4.0 turbo I6. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Ford AU Falcon XR6 Turbo (FG / FG X, Barra 270T) is rated 362 hp (ADR 270 kW / 367 PS (secondary listing) · AU market) at 5,250 rpm and weighs 3,900 lb (site estimate 3,900 lb, unverified: no Ford Australia kerb weight on a fetched page (listings 1,760–1,806 kg)), or 10.8 lb/hp. On enthusiast estimates its stock internals are taken to about ~800–900 hp, the fuel system to around ~480 hp, and the stock turbo(s) are taken to about ~450 hp. Below: the sourced spec sheet, the limit sheet carbuildcheck analyzes against, and the platform's community-documented weak points.
Units
01 Spec sheet sourced
EngineBarra · 3,984 cc · I6
Bore × stroke92.25 × 99.31 mm
Compression8.8:1
Inductionsingle turbo
Fuel systemport (sequential multiport)
Rated power362 hp · ADR 270 kW / 367 PS (secondary listing) · AU market @ 5,250 rpm
Torque393 lb-ft
Redlinenot sourced in this audit
Stock boostnot sourced in this audit
Transmission6MT · ZF 6AT
DrivetrainRWD
Curb weight3,900 lb · site estimate 3,900 lb, unverified: no Ford Australia kerb weight on a fetched page (listings 1,760–1,806 kg) · 10.8 lb/hp
GenerationFG (2008–2014) and FG X (2014–2016), 270 kW; BA (2002–2005) 240 kW, BF (2005–2008) 245 kW; FG X Sprint 325 kW · 2008–2016
rotating assembly ceiling · fails first: valve springs first (t1), oil pump gears next, then pistons on lightly tuned early engines · 98 RON / E85 · source: Street Machine (stock bottom end) · over 500 rwkW on stock bottom ends (t2) is roughly 780+ crank hp; the site plans on ~800 hp with springs, studs and gears done, down from its earlier 900 figure
Induction ceiling~450 hp
stock turbo / supercharger ceiling · fails first: stock turbo out of efficiency · 98 RON · no named source: site planning estimate · site planning figure ~450 hp; no named stock-turbo ceiling in this audit
Fuel system~480 hp
stock fuel-system ceiling · fails first: stock injectors and pump · 98 RON · no named source: site planning estimate · site planning figure; no named source in this audit
Clutch (manual)~400 hp
stock clutch torque capacity · fails first: stock clutch slip · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~500 hp
gearbox / driveline rating · fails first: ZF 6HP26 is strong; the 6MT gearsets first · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~500 hp
thermal ceiling for sustained load · fails first: oil temperature on sustained load · no named source: site planning estimate · site planning figure; no named source in this audit
⚑Valve springs are the Barra's first fuse (Street Machine: the first thing you changed); they drop cylinders before anything else breaks.
⚑Oil pump gears are the next known weak point at serious power (Street Machine); the bottom end itself is reported past 500 rwkW.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85; the clutch on a manual, a gearbox calibration on a automatic before sticky tires.
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