BMW 8 Series 840d Stage 1: 320→400hp | DMS Tuned

BMW 8 Series 840d Stage 1: 320→400hp

BMW 8 Series 840d Stage 1: 320hp → 400hp, 680→800Nm. Validated DMS calibration, proven on our dyno — not an off-the-shelf file. From €450. Athens + remote.…

BMW 8 Series Stage 1: 320 hp → 400 hp

Factory output for the BMW 8 Series 840d is 320 hp and 680 Nm. A Stage 1 remap targets 400 hp and 800 Nm — 80 hp (+25%) and 120 Nm (+18%).

Those are the figures we work to on this engine. They are a starting point, not a promise: the number we hand back is the one your car makes on our dyno, measured before and after on the same day, in the same conditions.

Where the 120 Nm shows up

On a diesel the useful change is torque, not peak power. Going from 680 Nm to 800 Nm fills in the mid-range, which is where a BMW 8 Series actually spends its time — pulling from 1,800 to 3,000 rpm in a high gear, overtaking without dropping two gears, towing or carrying weight without the engine falling on its face.

Peak power moves too, 320 hp to 400 hp, but you will feel the 120 Nm far more often than the 80 hp.

What Stage 1 involves on a BMW 8 Series

We read the ECU, log the car as it stands, and put it on the dyno to confirm the 320 hp baseline — a tired or faulty engine gets diagnosed before it gets mapped, not after.

The calibration is written for your car, not pulled from a file library. We adjust fuelling, ignition timing, injection timing and boost, then re-run the dyno to verify the 400 hp and 800 Nm figure and check knock, lambda and temperatures under load.

Turnaround is same-day for most cars. Stock file is archived, so the car can go back to standard whenever you want.

BMW 8 Series remap price and booking

Stage 1 for the BMW 8 Series 840d starts at €450, including the dyno runs before and after and the stock-file archive.

We work from Leoforos Karamanli 127, Artemida 19016, east of Athens, and tune remotely across Europe where the ECU allows it. WhatsApp +30 697 728 8810 with your registration for a straight answer on your car.

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