Car
Car: BMW M6 F13 (2012) – Cedric
Engine: 4.4 32V Bi-Turbo (V8) (S63B44)
Manufacturer data: 560 ch (552 hp) @ 6000-7000 rpm – 680 Nm (502 lb.ft) @ 1500-5750 rpm
ECU: Bosch MEVD 17.2.8
Mapping (David): Ethanol conversion + slight performance optimization (combustion efficiency only)
Configuration: Decatalyzed exhaust + EURO 6 injectors from M6 F13 phase 2 (2015-2017) for reliability reasons
Fuel: E85
PerfectPower Weighing
Date: Thursday, December 11, 2025
Place: France (77)
Result: 1893 kg (4173 lb) with 1/4 of a full tank ==> 1938 kg (4272 lb) with full tank (80 L)
PerfectPower Car Sheet
Note: The car weight is given with a full tank (PerfectPower and manufacturer standard) and the additional weight with a 80 kg (176 lb) person on board (arbitrary standard), but these two fields must of course be systematically adapted to the real measurement conditions during each session!
PerfectPower Results
Single session – Adjustment
Date: Wednesday, May 20, 2026
Place: France (77)
Software: PerfectPower Androïd 7.2
Hardware: David’s Xiaomi MI 8 + RaceBox Mini 25 Hz driven by PerfectPower
Power (I-II) measurement conditions:
- Mode 2 “GPS only”
- DIN 70020 standard (engine results corrected for 1013 hPa and 20°C (29.92 in Hg and 68 °F))
- Calculation of losses on parameters (standard mode in PerfectPower)
- With 2 people on board (Cedric & David) and with 1/4 of a full tank (stock) and full tank (maps 1 and 2)
- In 3rd gear from 2000 to 7200 rpm (rev limiter)
- With the WIXGEAR universal magnetic windshield mount even if it doesn’t matter in mode 2
- Official Result of each map tested = Average of 2 measurements performed in both directions of the road according to the strict recommendation of PerfectPower in order to eliminate the effects of road slope and wind
Accelerations (III) measurement conditions:
- Mode 2 “GPS only”
- Measurement stop mode “Normal” (stop when the user slows down)
- With 2 people on board (Cedric & David) and with full tank
- Stop as soon as 200 km/h is reached
- With the WIXGEAR universal magnetic windshield mount even if it doesn’t matter in mode 2
- One measurement performed in direction 2 of the road, but this one is almost flat and no wind was blowing that day, which makes the times valid
Note: The E85 used for this session was actually verified E81.
I) Map 2 (ethanol conversion + slight performance optimization)
Official Result = Average of the 2 measurements
Comparison of results with manufacturer data for this engine (S63B44):
- Max Power: + 50.2 ch / hp & + 9.0 %
- Max Torque: + 78.0 Nm & + 11.5 %
II) Comparison:
Stock
Map 1 (Ethanol conversion)
Map 2 (Ethanol conversion + slight performance optimization)
Official Results Stock / Map 1 / Map 2
Comparison of stock results with manufacturer data for this engine (S63B44):
- Puissance maxi: + 29.0 ch / hp & + 5.2 %
- Couple maxi: + 21.1 Nm & + 3.1 %
One thing is certain: Cedric’s M6 engine is in great shape! Now, without downplaying the impressive performance of delivering nearly 30 hp more than the advertised horsepower (!), two elements must be taken into account:
- Cedric’s M6 is not completely stock mechanically since it has a decatalyzed exhaust, which can provide a significant gain, especially at high revs (which we are observing here)!
- We do not know the policy used for the homologation of this S63B44 engine, and it could be the so-called “minimal” engine policy (which consists of selecting for homologation the least powerful engine among all those measured, which guarantees that all engines produced are GUARANTEED to deliver the advertised horsepower!), which would be corroborated by the various dyno tests in Europe of cars equipped with this engine (M5 F10 and M6 F12/F13)!
But again, this does not detract from the remarkable performance of Cedric’s M6, the most powerful car in the PerfectPower Lab!
Calculation of BEFORE (Stock) / AFTER (C2) gains:
- Puissance maxi: + 21.2 ch / hp & + 3.6 %
- Couple maxi: + 56.9 Nm & + 8.1 %
End Wednesday…