S55B30T0SourceUS tech sheet engine type; commonly written S55B30
Layout
Inline-6, 4 valves/cyl, two mono-scroll turbochargers, High Precision direct injection, VALVETRONIC, Double-VANOSSourceUS 2015 sheet calls them 'Two single scroll turbochargers'
7,500 rpmSourceMotorTrend spec table 'REDLINE 7,500 rpm'. BMW sheets do not state redline; the oft-quoted 7,600 rpm limiter is not primary-sourcedSources differ: 7,500 (MotorTrend) vs 7,600 (common forum/press claim, unverified)
Power (US)
425 hpSource@5,500-7,300 rpm; identical MY15-MY18 per US sheets
Power (EU)
317 kW · 431 PSSourceUK sheet labels it 'Kw/hp 317/431' (metric hp = PS)
155 mph limited · 174 mph with M Driver's PackageSource155 mph / 250 km/h limited per sheet; 174 mph (280 km/h) with M Driver's Package (7ME). US price guides list 7ME only on MY2018 ($2,500); MY15-17 US availability unconfirmed
3.462:1SourceSame for 6MT and 7DCT, all MYs and CS
Differential
Active M Differential: electronically controlled multi-plate LSD, 0-100% lock, standardSource
Weight & size
Curb weight (US)
MY2015 6MT 3540, 7DCT 3595 · MY2017 6MT 3575, 7DCT 3630 · MY2018 6MT 3575, 7DCT 3630SourceMY2015 from 2015 sheet; MY2017/18 from those sheets (sources: us17_tech, us18_tech). MY2016 sheet not foundSources differ: US curb weight rose 35 lb between MY2015 and MY2017 sheets; reason not stated (likely LED lights/equipment)
M Compound: front 4-piston fixed calipers, vented & cross-drilled discs 15.0 in (380 mm); rear 2-piston fixed, 14.6 in (370 mm)SourceInch diameters from US 2015 sheet; mm conversions = inch*25.4 rounded (380/370)
Carbon ceramic brakes
M Carbon Ceramic (option 2NK): front 6-piston fixed calipers, 15.75 in (400 mm) discs; rear 4-piston fixed, 15.0 in (380 mm)SourceDisc diameters: BMW US 2015 sheet (MotorTrend measured 15.8/15.0 in). Piston counts: BMW M3 CS EU press kit (
Wheels & tires (US std)
18 in Style 513M V-spoke (2PN): F 9Jx18 255/40 ZR18 95Y, R 10Jx18 275/40 ZR18 99YSourceSizes from us15_tech; style code from US price guides MY15-MY18. UK sheet misprints front tyre as 225/40
Optional wheels (US)
19 in Style 437M double-spoke (2VY silver / 2VZ black), $1,200: F 9Jx19 255/35 ZR19, R 10Jx19 275/35 ZR19, Michelin Pilot Super SportSourceSizes from MotorTrend 2015 comparison spec table ( required for CCB
Suspension
Front aluminium double-joint spring strut; rear aluminium five-link; Adaptive M Suspension (2VF) $1,000 option MY15-16, standard MY17+ (ZSU standard suspension no-cost delete)SourceOption/standard status from US price guides MY15/MY16 (2VF $1,000) and MY17/MY18 (ZSU delete option)
Inside & trim
Seats
M sport front seats, electric adjust, heated; 5 seatsSource
Fuel & price
EPA mpg
Manual 17/26/20 · DCT 17/24/19SourceSame on MY18 US sheet (us18_tech); fueleconomy.gov cross-check pending