BMW 3 Series (E46) 2003-2005 320d 150bhp remap figures
The BMW 3 Series 320d 150bhp (2003-2005) is a diesel 2.0L model making 150bhp and 330Nm as standard. After a Stage 1 ECU remap we expect 211bhp and 442Nm - up to 61bhp and 112Nm more than stock.
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 | 150 bhp | 211 bhp | +61 bhp |
| Torque | 330 Nm | 442 Nm | +112 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 150 bhp | 330 Nm | |
| Stage 1Maximum software-only performance | 211 bhp | 442 Nm | +61 bhp +112 Nm |
| Stage 1 EcoPerformance with economy in mind | 196 bhp | 433 Nm | +46 bhp +103 Nm |
| Eco mapEconomy first | 191 bhp | 427 Nm | +41 bhp +97 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 3 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.
Engine management is by a Bosch EDC16C31 unit. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.
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 3 Series 320d 150bhp?
We expect 211bhp and 442Nm against 150bhp and 330Nm as standard: up to +61bhp and +112Nm. 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 3 Series 320d 150bhp?
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: 196bhp and 433Nm expected. The Eco map is economy first: 191bhp and 427Nm. Both still sit above the standard 150bhp and 330Nm.
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 3 Series figures
Other diesel variants
All diesel 3 Series (E46) variants · 3 Series (E46) 1998-2005 overview · All BMW figures