BMW 3 Series (E46) 1998-2002 320d 136bhp remap figures
The BMW 3 Series 320d 136bhp (1998-2002) is a diesel 2.0L model making 136bhp and 279Nm as standard. After a Stage 1 ECU remap we expect 183bhp and 420Nm - up to 47bhp and 141Nm 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 | 136 bhp | 183 bhp | +47 bhp |
| Torque | 279 Nm | 420 Nm | +141 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 136 bhp | 279 Nm | |
| Stage 1Maximum software-only performance | 183 bhp | 420 Nm | +47 bhp +141 Nm |
| Stage 1 EcoPerformance with economy in mind | 171 bhp | 409 Nm | +35 bhp +130 Nm |
| Eco mapEconomy first | 167 bhp | 402 Nm | +31 bhp +123 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
On a diesel the biggest change is normally torque: the remap changes how much fuel and boost the ECU allows across the rev range, so pulling power arrives earlier and holds on longer.
The ECU recorded for this variant is a Bosch DDE3.0. 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 136bhp?
We expect 183bhp and 420Nm against 136bhp and 279Nm as standard: up to +47bhp and +141Nm. 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 136bhp?
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: 171bhp and 409Nm expected. The Eco map is economy first: 167bhp and 402Nm. Both still sit above the standard 136bhp and 279Nm.
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