Expected gains of +44 BHP and +120 Nm torque
Get Your Free Quote ↓Considering an ECU remap for your BMW Z4 3.5i - N55 - Twinscroll - 306hp? A Stage 1 remap can take this E85 - 2003 - 2008 petrol engine from 306 BHP to 350 BHP and from 400 Nm to 520 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 Z4 can achieve.
The BMW Z4 3.5i - N55 - Twinscroll - 306hp is a 3.0L turbocharged petrol engine producing 306 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 350 BHP and 520 Nm — a gain of around 44 BHP (14%) and 120 Nm (30%).
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 5/6-speed automatics (where fitted); manuals also exist. at this torque level, transmission and driveline servicing history becomes especially important..
Considerations: Turbo petrol: fuel quality and cooling can influence repeatable performance.. 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 |
|---|---|---|---|---|---|
| 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) |
| 2.5si 218hp | 218 → 235 | +17 | 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) |
| 3.5is - 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) |
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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.