Considering an ECU remap for your BMW 4 Series 420d 184hp? A Stage 1 remap can take this F32/33 - May/2016 - 2019 diesel engine from 184 BHP to 220 BHP and from 380 Nm to 440 Nm of torque (turbocharged). This engine scores 7/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 4 Series can achieve.
The BMW 4 serie 420d 184hp is a 2.0L turbocharged diesel engine producing 184 BHP and 380 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 220 BHP and 440 Nm — a gain of around 36 BHP (20%) and 60 Nm (16%).
This engine has moderate remap suitability, with a balanced spread of gains across both power and torque — providing a noticeable improvement across the rev range. 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 |
|---|---|---|---|---|---|
| 418d 150hp | 150 → 190 | +40 | 320 → 400 |
| +80 |
| Excellent (8/10) |
| 420d 163hp | 163 → 220 | +57 | 380 → 440 | +60 | Good (7.5/10) |
| 420i 184hp | 184 → 250 | +66 | 270 → 440 | +170 | Good (6.5/10) |
| 420d 190hp | 190 → 220 | +30 | 400 → 440 | +40 | 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) |
| 435d 313hp | 313 → 360 | +47 | 630 → 700 | +70 | Good (6.5/10) |
| 440i 326hp | 326 → 400 | +74 | 450 → 585 | +135 | 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.
