BHP+17 hp (6%)
Standard
304 hp
Tuned
321 hp
Torque+24 Nm (5%)
Standard
447 Nm
Tuned
471 Nm
Suitability
Limited (3.5/10)Gains Profile
Limited headroomHeadroom
LowBuick Rainier 5.3 V8 304hp ECU Remapping
Considering an ECU remap for your Buick Rainier 5.3 V8 304hp? A Stage 1 remap can take this 2004 - 2007 petrol engine from 304 BHP to 321 BHP and from 447 Nm to 471 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 Buick Rainier can achieve.
How this engine compares
- 1stof 3 Buick Rainier engines by power gain
- 12%of the 9,842 engines we hold gain data for see a smaller power increase
- 13%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The Buick Rainier 5.3 V8 304hp is a 5.3L naturally aspirated petrol engine producing 304 BHP and 447 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 321 BHP and 471 Nm — a gain of around 17 BHP (6%) and 24 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 Rainier 2004 - 2007 Engines
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