Considering an ECU remap for your Hummer H3 5.3 V8 300hp? A Stage 1 remap can take this 2006 - 2010 petrol engine from 300 BHP to 320 BHP and from 430 Nm to 450 Nm of torque (naturally aspirated). This engine scores 3.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your Hummer H3 can achieve.
The Hummer H3 5.3 V8 300hp is a 5.3L naturally aspirated petrol engine producing 300 BHP and 430 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 320 BHP and 450 Nm — a gain of around 20 BHP (7%) and 20 Nm (5%).
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.
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
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 |
|---|---|---|---|---|---|
| 3.5 220hp | 220 → 240 | +20 | 305 → 325 | +20 |
| Moderate (4/10) |
| 3.7 242hp | 242 → 260 | +18 | 328 → 350 | +22 | Moderate (4/10) |
Get a personalised remap quote for your Hummer H3. 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.
