The BMW M3 / M4 Competition (G80/G82) is rated 503 hp (SAE, Competition; EU 375 kW / 510 PS · US market) at 6,250 rpm and weighs 3,890 lb (US curb, M3 Competition sedan (M4 Competition 3,880 lb); DIN 1,730 kg), or 7.7 lb/hp. On enthusiast estimates its stock internals are taken to about ~900 hp, the fuel system to around ~680–800 hp, and the stock turbo(s) are taken to about ~680–800 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
EngineS58 · 2,993 cc · I6
Engine codeS58B30T0
Bore × stroke84 × 90 mm
Compression9.3:1
Inductiontwo mono-scroll turbochargers
Fuel systemdirect (High Precision Injection)
Rated power503 hp · SAE, Competition; EU 375 kW / 510 PS · US market @ 6,250 rpm
Torque479 lb-ft @ 2,750–5,500 rpm
Redline7,200 rpm
Stock boost1.70 bar (24.7 psi), gauge
Transmission8-speed M Steptronic (Competition); 6MT on base cars
DrivetrainRWD
Curb weight3,890 lb · US curb, M3 Competition sedan (M4 Competition 3,880 lb); DIN 1,730 kg · 7.7 lb/hp
GenerationG80 (M3) · G82/G83 (M4) · G81 (Touring) · 2021–2024 pre-facelift; base manual cars rated 473 hp US / 480 PS EU · pre-facelift (before the LCI, BMW’s term for the facelift)
rotating assembly ceiling · fails first: fueling and traction long before the rotating assembly · 93 AKI / E85 · no named source: site planning estimate · site planning figure; the sources describe stock internals holding the fuel-system ceiling, not a rod limit
Induction ceiling~680–800 hp
stock turbo / supercharger ceiling · fails first: stock turbos out of efficiency · 93 AKI (98 RON) · source: MHD Tuning, S58 Super License (stage 2, 93 octane) · MHD rates stage 2 on 93 at 680 hp (t3) and on E40 at 800+ hp (t4); the site plans on the 93-octane figure
Fuel system~680–800 hp
stock fuel-system ceiling · fails first: HPFP flow on full E85 (MHD: fuel system limited at 680 hp, t1); on 93 and E40 the stock fueling carries the stage-2 ratings · 93 AKI and E40 on stock fueling; full E85 is HPFP-limited · source: MHD Tuning, S58 Super License (stage map ratings) · MHD rates stage 2 on 93 at 680 hp with no fuel note (t3) and E40 at 800+ hp (t4); only the full-E85 map is marked fuel-system limited, at 680 hp (t1); the site plans on 680 hp
Clutch (manual)~550 hp
stock clutch torque capacity · fails first: stock manual clutch (base cars) slip · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~800 hp
gearbox / driveline rating · fails first: 8HP76 torque-converter box, well above stock · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~650 hp
thermal ceiling for sustained load · fails first: charge-air heat soak on repeated pulls · no named source: site planning estimate · site planning figure; no named source in this audit
⚑Stock internals are reported holding 650–700 whp on E85 (bmwtuning.co); fueling and traction tap out long before the block.
⚑Stock high-pressure fueling walls at 680 hp on full E85 per MHD; E30–E40 blends run on the stock pumps. Port injection is the chapter for full E85.
04 The typical path
Flash first (MHD rates stage 1 on 93 at 650 hp on a stock car); catless downpipes and an E30–E40 blend are chapter two on the stock fueling; port injection only for full E85. Traction and brakes long before the block.
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