JAPAN AWD /// platform file
Subaru WRX (VA, 2015–2021) build guide
FA20DIT · 2.0 turbo flat-4. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Subaru WRX (VA, 2015–2021) is rated 268 hp (SAE · US market) at 5,600 rpm and weighs 3,269 lb (US base curb, 6-speed manual (CVT Premium 3,450 lb with options)), or 12.2 lb/hp. On enthusiast estimates its stock internals are taken to about ~400–438 hp, the fuel system to around ~400 hp, and the stock turbo(s) are taken to about ~400–563 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
EngineFA20DIT · 1,998 cc · flat-4
Bore × stroke86 × 86 mm
Compression10.6:1
Inductiontwin-scroll turbo with intercooler, 15.9 psi max boost
Fuel systemdirect (GDI)
Rated power268 hp · SAE · US market @ 5,600 rpm
Torque258 lb-ft @ 2,000–5,200 rpm
Redline6,700 rpm
Stock boost1.10 bar (15.9 psi), gauge
Transmission6MT · Sport Lineartronic CVT
DrivetrainAWD
Curb weight3,269 lb · US base curb, 6-speed manual (CVT Premium 3,450 lb with options) · 12.2 lb/hp
GenerationVA · 2015–2021 (268 hp throughout)
Verified againstSubaru of America, 2016 WRX specifications (PDF) (primary, read 2026-09-06); Subaru of America, 2015 WRX debuts (press release) (primary, read 2026-09-06) · The mass rests on one document.
02 What stock parts support enthusiast estimates
Engine internals~400–438 hp
rotating assembly ceiling · fails first: connecting rods at 320–350 whp / 325–350 lb-ft (t1) · 93 AKI · source: 8020 Automotive, FA20 WRX performance mods · 320–350 whp (t1) is 400–438 crank at the 20 % AWD loss the site uses; the site plans on 400 hp, the bottom of that band
Induction ceiling~400–563 hp
stock turbo / supercharger ceiling · fails first: stock turbo out of efficiency near 450 whp (t2); the rods go first on most builds · 93 AKI to E85 · source: 8020 Automotive, FA20 WRX performance mods (stock turbo ceiling) · a full bolt-on car lands near 320 whp, about 400 crank at 20 %, and the stock turbo has been taken to ~450 whp on E85 (t2, roughly 560 crank); the site plans on 400 hp and lets the rod estimate carry the warning
Fuel system~400 hp
stock fuel-system ceiling · fails first: low-pressure pump first past ~30 % E85 (8020, t3), then the HPFP from lost lubricity · 93 AKI; blends above ~30 % E85 need an LPFP · source: 8020 Automotive, FA20 WRX performance mods (fuel system) · 8020 puts a full bolt-on car at 320 whp (~400 crank) on the stock fuel system on pump gas (t1); the site plans on 400 hp
Clutch (manual)~310 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 (CVT)~360 hp
gearbox / driveline rating · fails first: CVT torque limit; the 6MT holds more · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~370 hp
thermal ceiling for sustained load · fails first: oil temperature on track · no named source: site planning estimate · site planning figure; no named source in this audit
Tuning limitsenthusiast estimates, crank hp on the stated fuel; sources: 8020 Automotive, FA20 WRX performance mods; method: the analyzer plans on the lower bound of each range
Planning figures, conservative by design, never a manufacturer claim. How these are used in the score →
03 Where it breaks first community-documented
FA20DIT rods are the fuse (8020: they commonly fail at 320–350 whp). Conservative tunes live long lives; aggressive off-the-shelf maps end up on engine stands.
Same rule as the EJ: the tuner matters more than the parts list (community consensus).
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 CVT before sticky tires.
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