This BMW 640d Convertible (F12) came in for our Stage 1 custom dyno tune for the N57 3.0 twin-turbo diesel, with an xHP Stage 3 calibration for its ZF 8-speed automatic, both developed on the same visit.
The 640d Convertible strapped down on our dyno.
The numbers
On the baseline run it made 300.9bhp and 608Nm. With our calibration and xHP Stage 3 it made 388.0bhp and 782Nm, with 348.8bhp at the wheels. That is 87.1bhp and 174Nm more:
Measurement
Stock
DC Stage 1 Custom & xHP ST3
Engine power
300.9 hp @ 4,404rpm
388.0 hp @ 4,244rpm
Engine torque
608 Nm @ 2,308rpm
782 Nm @ 2,361rpm
Wheel power
264.5 hp @ 4,273rpm
348.8 hp @ 4,202rpm
The dyno printout: stock in red, our Stage 1 + xHP ST3 in blue.
Watch the full dyno run
This is the final pull on our dyno, filmed from behind the car, from the start of the run right through to the end. Tap Sound on to hear it.
The final power run on our dyno: 388.0bhp and 782Nm.
More torque than a BMW M8
BMW’s M8 and M8 Competition both make 750Nm from the factory. Tuned, this 640d made 782Nm on our rollers, from the same N57 the car left the factory with: it holds over 750Nm from around 2,100 to 3,150rpm and over 700Nm all the way to around 3,750rpm.
N57 3.0 twin-turbo diesel: health checked and logged before any tuning.
Where the gain is
The peak is only part of it. Tuned, this 640d carries 100Nm or more extra torque from around 2,000rpm to the top of the stock run, 150Nm or more from around 2,150rpm, and close to 190Nm more at around 3,400rpm. Power stays above 350bhp from around 3,350rpm, with 80bhp or more over standard from around 3,100rpm to the top of the stock run. In normal driving that is the part you feel: it pulls harder through the mid-range, holds on for longer and needs fewer downshifts.
The gearbox, tuned with the engine
xHP Stage 3 was flashed into the ZF 8-speed on the same visit. It removes the factory torque limiter and raises line pressure for the extra torque, with quicker shifts in D and harder, faster shifts in Sport and Sport+, so the engine and gearbox are calibrated as one package instead of two separate jobs.
Baseline runs first: every calibration starts from the car’s own numbers.
How it was done
Diagnostics and a health check first, then baseline runs on our 4WD linked dyno with live data logging. The engine calibration was built from there with repeated runs, the gearbox was flashed with xHP Stage 3, and the final pulls verified the result. No generic files: a calibration written for this car, proven on our dyno.
Bonnet up between runs: every change logged and checked on the rollers.
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