BHP+20 hp (7%)
Standard
300 hp
Tuned
320 hp
Torque+20 Nm (5%)
Standard
430 Nm
Tuned
450 Nm
Suitability
Limited (3.5/10)Gains Profile
Limited headroomHeadroom
LowHummer H3 5.3 V8 300hp ECU Remapping
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.
How this engine compares
- 1stof 3 Hummer H3 engines by power gain
- 14%of the 9,842 engines we hold gain data for see a smaller power increase
- 8%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
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.
Considerations
!Naturally aspirated engine: gains are usually limited; results vary widely.
!High tuned torque: check transmission torque capacity and service history.
Other H3 2006 - 2010 Engines
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