Data under review — The figures shown for this engine variant are currently being verified. They may be updated as we refine our data.
Considering an ECU remap for your BMW 4 Series 420i 184hp? A Stage 1 remap can take this F32/33 - 2013 - 2016 petrol engine from 184 BHP to 250 BHP and from 270 Nm to 440 Nm of torque (naturally aspirated). 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.
The BMW 4 serie 420i 184hp is a 2.0L naturally aspirated petrol engine producing 184 BHP and 270 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 250 BHP and 440 Nm — a gain of around 66 BHP (36%) and 170 Nm (63%).
This engine has moderate remap suitability, with gains weighted towards torque — you will notice the difference most strongly in mid-range pulling power and in-gear acceleration. The tuning headroom is classified as high, based on the percentage gain available from the factory output.
From a technical perspective, the transmission is many variants use zf 8-speed automatic (where fitted); manuals also exist..
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. Unusually high gain for NA engine: treat as an estimate and verify against the exact engine variant.. High tuned torque: check transmission torque capacity and service history.. Large torque increase: drivetrain condition (clutch/gearbox) becomes more important at this level.
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 (1.5T) 136hp | 136 → 165 | +29 | 220 → 270 | +50 | Good (7.5/10) |
| 418D 150hp | 150 → 190 | +40 | 320 → 400 | +80 | Excellent (8/10) |
| 420D 163hp | 163 → 220 | +57 | 380 → 440 | +60 | Good (7.5/10) |
| 420D 184hp | 184 → 220 | +36 | 380 → 440 | +60 | Good (7/10) |
| 420D 190hp | 190 → 220 | +30 | 400 → 440 | +40 | Good (6.5/10) |
| 425D 218hp | 218 → 270 | +52 | 450 → 500 | +50 | Good (7/10) |
| 428i 245hp | 245 → 280 | +35 | 350 → 430 | +80 | Moderate (5/10) |
| 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 → 365 | +59 | 400 → 500 | +100 | Moderate (5.5/10) |
| 435xD 313hp | 313 → 365 | +52 | 630 → 710 | +80 | Good (6.5/10) |
| M4 - 431hp | 431 → 500 | +69 | 600 → 650 | +50 | Moderate (4.5/10) |
| M4 Competition 450hp | 450 → 500 | +50 | 550 → 680 | +130 | Moderate (5/10) |
| M4 GTS 500hp | 500 → 530 | +30 | 600 → 700 | +100 | Moderate (4.5/10) |
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.
