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BMW 640d Gran Coupé: Stage 1 + xHP Stage 3, 389bhp & 770Nm

6 October 2026 · DC Remapping UK

This BMW 640d Gran Coupé F06 came in for our Stage 1 custom dyno tune for the N57 3.0 diesel, with an xHP Stage 3 calibration for the ZF 8-speed.

BMW 640d Gran Coupé rear three-quarter on the dyno
The 640d Gran Coupé on our 4WD linked dyno.

The numbers

It made 307bhp and 626Nm on the baseline run and left making 389bhp and 770Nm, more torque than an F90 M5:

MeasurementStockDC Stage 1 + xHP ST3
Engine power307.5 hp @ 4,273rpm389.4 hp @ 3,914rpm
Engine torque626 Nm @ 2,498rpm770 Nm @ 2,434rpm
Wheel power271.3 hp355.6 hp
BMW 640d Gran Coupé dyno graph, stock vs DC Stage 1 + xHP ST3
The dyno printout, stock in red, tuned in blue.

Over 700Nm from 2,100 to 3,900rpm

The gain is not just at the peak. Tuned, this 640d holds over 700Nm from around 2,100 to 3,900rpm and carries more than 100Nm extra all the way from 2,150 to 5,000rpm, with up to 180Nm more in the mid-range. xHP Stage 3 lets the 8-speed handle that torque properly, with quicker, sharper shifts.

BMW 640d Gran Coupé rear view on the rollers
Strapped down for back-to-back runs.

How it was done

Diagnostics and a health check first, then stock 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, original software backed up and fully reversible.

BMW 640d Gran Coupé front quarter with the bonnet up
Diagnostics and a health check before any tuning.

Got a 640d? See our BMW 640d tuning page, check your car’s gains and price, or read about the other 640d we tuned.

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