Considering an ECU remap for your BMW 4 Series 420d 190hp? A Stage 1 remap can take this F36 - May/2016 - 2021 diesel engine from 190 BHP to 220 BHP and from 400 Nm to 440 Nm of torque (turbocharged). This engine scores 6.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 4 Series can achieve.
Comparisons are calculated from our own recorded Stage 1 figures.
The BMW 4 serie 420d 190hp is a 2.0L turbocharged diesel engine producing 190 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 220 BHP and 440 Nm — a gain of around 30 BHP (16%) and 40 Nm (10%).
This engine has moderate remap suitability, with gains weighted towards peak power — the improvement is most noticeable at higher RPM. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.
From a technical perspective, the ECU is typically a Bosch EDC17 (likely), and the transmission is many variants use zf 8-speed automatic (where fitted); manuals also exist..
Considerations: High tuned torque: check transmission torque capacity and service history.
Fuel economy note: possible improvement with conservative driving.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
| Engine |
|---|
| BHP |
|---|
| Gain |
|---|
| Torque |
|---|
| Gain |
|---|
| Score |
|---|
| 418i 136hp | 136 → 170 | +34 | 220 → 280 | +60 | Moderate (5.5/10) |
| 418d 150hp | 150 → 190 | +40 | 320 → 400 | +80 | Excellent (8/10) |
| 420i 184hp | 184 → 250 | +66 | 270 → 440 | +170 | Good (6.5/10) |
| 425d 224hp | 224 → 270 | +46 | 450 → 500 | +50 | Good (7/10) |
| 430i 252hp | 252 → 287 | +35 | 350 → 450 | +100 | Moderate (5.5/10) |
| 430d 258hp | 258 → 310 | +52 | 560 → 650 | +90 | Good (7/10) |
| 435i 306hp | 306 → 370 | +64 | 400 → 520 | +120 | Moderate (5.5/10) |
| 435d 313hp | 313 → 360 | +47 | 630 → 700 | +70 | Good (6.5/10) |
| 440i 326hp | 326 → 380 | +54 | 450 → 560 | +110 | Moderate (5.5/10) |
Get a personalised remap quote for your BMW 4 Series. We'll connect you with a trusted professional in your area.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.
We recommend discussing your specific vehicle with a qualified remap professional before proceeding.
