BHP+55 hp (12%)
Standard
445 hp
Tuned
500 hp
Torque+116 Nm (9%)
Standard
1234 Nm
Tuned
1350 Nm
Suitability
Good (6.5/10)Gains Profile
Power-focusedHeadroom
MediumGMC Sierra 6.6 V8 445hp ECU Remapping
Considering an ECU remap for your GMC Sierra 6.6 V8 445hp? A Stage 1 remap can take this 2017 -> diesel engine from 445 BHP to 500 BHP and from 1234 Nm to 1350 Nm of torque (turbocharged). This engine scores 6.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your GMC Sierra can achieve.
How this engine compares
- 1stof 21 GMC Sierra engines by power gain
- 82%of the 9,842 engines we hold gain data for see a smaller power increase
- 87%of engines with torque data see a smaller torque increase
Comparisons are calculated from our own recorded Stage 1 figures.
Assessment
The GMC Sierra 6.6 V8 445hp is a 6.6L turbocharged diesel engine producing 445 BHP and 1234 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 500 BHP and 1350 Nm — a gain of around 55 BHP (12%) and 116 Nm (9%).
This engine has moderate remap suitability, with gains weighted towards peak power — the improvement is most noticeable at higher RPM. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.
Considerations: 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
!High tuned torque: check transmission torque capacity and service history.
Other Sierra 2017 -> Engines
| Engine | BHP | Gain | Torque | Gain | Score |
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