BMW 8 Series (G15) 2019> 840d 315bhp remap figures
Thinking of remapping a BMW 8 Series 840d 315bhp? The standard car makes 315bhp and 681Nm; with a Stage 1 remap from our Leicester workshop we expect around 407bhp and 802Nm, up to +92bhp and +121Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 315 bhp | 407 bhp | +92 bhp |
| Torque | 681 Nm | 802 Nm | +121 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 315 bhp | 681 Nm | |
| Stage 1Maximum software-only performance | 407 bhp | 802 Nm | +92 bhp +121 Nm |
| Stage 1 EcoPerformance with economy in mind | 384 bhp | 792 Nm | +69 bhp +111 Nm |
| Eco mapEconomy first | 377 bhp | 786 Nm | +62 bhp +105 Nm |
Who is the Stage 1 map for?
- Drivers who want stronger pulling power for overtaking, hills and towing, with no parts to fit.
- Daily and motorway drivers who want the engine to feel less strained at cruising speed.
- Anyone who wants the biggest software-only change we list for this engine.
What this means for your 8 Series
Diesel remaps work mainly on boost pressure, fuel delivery and torque limiters, which is why the Nm gain is usually the figure you feel in everyday driving, particularly when overtaking or towing.
The ECU recorded for this variant is a Bosch MD1CP002. Newer ECUs often protect their software, so we read the exact unit and version on the car before confirming the figures on this page.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the BMW 8 Series 840d 315bhp?
We expect 407bhp and 802Nm against 315bhp and 681Nm as standard: up to +92bhp and +121Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the BMW 8 Series 840d 315bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 384bhp and 792Nm expected. The Eco map is economy first: 377bhp and 786Nm. Both still sit above the standard 315bhp and 681Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More BMW 8 Series figures
Other diesel variants
All diesel 8 Series (G15) variants · 8 Series (G15) 2018> overview · All BMW figures