Considering an ECU remap for your BMW Z4 2.5si 218hp? A Stage 1 remap can take this E85 - 2003 - 2008 petrol engine from 218 BHP to 235 BHP and from 250 Nm to 270 Nm of torque (naturally aspirated). This engine scores 4/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW Z4 can achieve.
The BMW Z4 2.5si 218hp is a 2.5L naturally aspirated petrol engine producing 218 BHP and 250 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 235 BHP and 270 Nm — a gain of around 17 BHP (8%) and 20 Nm (8%).
This engine has limited remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
From a technical perspective, the transmission is many variants use zf 5/6-speed automatics (where fitted); manuals also exist..
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.
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 |
|---|---|---|---|---|---|
| 2.0i 150hp | 150 → 165 | +15 | 190 → 210 | +20 | Moderate (4.5/10) |
| 2.2i 170hp | 170 → 185 | +15 | 210 → 235 | +25 | Moderate (4.5/10) |
| 2.5i 177hp | 177 → 193 | +16 | 230 → 255 | +25 | Moderate (4/10) |
| 2.5i 192hp | 192 → 210 | +18 | 245 → 265 | +20 | Moderate (4/10) |
| 2.3i 204hp | 204 → 225 | +21 | 250 → 275 | +25 | Moderate (4.5/10) |
| 2.5i 211hp | 211 → 235 | +24 | 250 → 270 | +20 | Moderate (4/10) |
| 3.0i 231hp | 231 → 246 | +15 | 300 → 320 | +20 | Moderate (4/10) |
| 3.0i 258hp | 258 → 278 | +20 | 300 → 320 | +20 | Moderate (4/10) |
| 3.0si 265hp | 265 → 280 | +15 | 315 → 360 | +45 | Moderate (4/10) |
| 3.5i - N54 - 306hp | 306 → 370 | +64 | 400 → 500 | +100 | Good (7.5/10) |
| 3.5i - N55 - Twinscroll - 306hp | 306 → 350 | +44 | 400 → 520 | +120 | Good (7/10) |
| 3.5is - N54 - 340hp | 340 → 370 | +30 | 450 → 500 | +50 | Moderate (5.5/10) |
| M 3.2 343hp | 343 → 365 | +22 | 365 → 385 | +20 | Moderate (4/10) |
Get a personalised remap quote for your BMW Z4. 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.
