The BMW M3 CS (G80) is rated 543 hp (SAE; EU 405 kW / 550 PS · US market) at 6,250–7,200 rpm and weighs 3,915 lb (US curb, M3 CS (about 75 lb under the M3 Competition per BMW)), or 7.2 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 power543 hp · SAE; EU 405 kW / 550 PS · US market @ 6,250–7,200 rpm
Torque479 lb-ft @ 2,750–5,950 rpm
Redline7,200 rpm
Stock boost2.10 bar (30.5 psi), gauge
Transmission8-speed M Steptronic, M xDrive
DrivetrainAWD
Curb weight3,915 lb · US curb, M3 CS (about 75 lb under the M3 Competition per BMW) · 7.2 lb/hp
GenerationG80 (M3 CS) · the M4 CSL (G82, 2022) shares the 550 PS state of tune at 1,625 kg DIN, RWD · 2024 model year (US production from March 2023) · pre-facelift (before the LCI, BMW’s term for the facelift)
rotating assembly ceiling · fails first: fueling and traction before the rotating assembly · 93 AKI / E85 · no named source: site planning estimate · same S58; site planning figure
Induction ceiling~680–800 hp
stock turbo / supercharger ceiling · fails first: stock turbos out of efficiency; the CS already runs 30.5 psi · 93 AKI (98 RON) · source: MHD Tuning, S58 Super License (stage 2, 93 octane) · MHD rates stage 2 on 93 at 680 hp for the G8x S58 (t3); the factory already spent part of the turbo margin on the CS boost increase
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)~680 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
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