The BMW M3 Competition xDrive (G80 facelift) is rated 523 hp (SAE, Competition xDrive; EU 390 kW / 530 PS · US market) at 6,250 rpm and weighs 3,990 lb (US curb, M3 Competition xDrive sedan (Competition RWD 3,891 lb, base 3,840 lb)), or 7.6 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 power523 hp · SAE, Competition xDrive; EU 390 kW / 530 PS · US market @ 6,250 rpm
Torque479 lb-ft @ 2,750–5,730 rpm
Redline7,200 rpm
Stock boostnot sourced in this audit
Transmission8-speed M Steptronic
DrivetrainAWD
Curb weight3,990 lb · US curb, M3 Competition xDrive sedan (Competition RWD 3,891 lb, base 3,840 lb) · 7.6 lb/hp
GenerationG80 (M3) · G82 (M4) · 2025– (production from July 2024); only the Competition xDrive gained 20 hp, RWD Competition stays 503 hp, base 473 hp · facelift (LCI, BMW’s term)
rotating assembly ceiling · fails first: fueling and traction before the rotating assembly · 93 AKI / E85 · no named source: site planning estimate · same S58 as the pre-facelift Competition; site planning figure
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 lists G8x 2021+ without a facelift split; stage 2 on 93 is rated 680 hp (t3), E40 800+ hp (t4)
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 (t3) and E40 at 800+ hp (t4) on stock fueling; the full-E85 map is fuel-system limited at 680 hp (t1); the site plans on 680 hp
Transmission (automatic)~800 hp
gearbox / driveline rating · fails first: 8HP76 and the xDrive transfer case · 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 · no named source: site planning estimate · site planning figure; no named source in this audit
⚑Mechanically the pre-facelift S58 recipe with 20 hp more on the xDrive Competition; the pre-facelift tuning playbook carries over (MHD lists one G8x map family).
⚑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
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85; a automatic gearbox calibration before sticky tires.
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