Your Vehicle
GMC Sierra 4.8 V8 302hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible.
Power HP
Torque Nm
Book your Stage 1 remap
499 € VAT included · pay online, the work is done at the workshop you choose
Power Graph
GMC Sierra 4.8 V8 302hp: da 302 a 320HP
Remapping GMC Sierra
MasterTuning is a leader in developing remapping for GMC. La GMC Sierra 4.8 V8 302hp può passare da 302 HP a 320 HP con un incremento di 18 HP.
The development of each remap is customized by MasterTuning.
- 100% tested and customized files guarantee
- Tested and developed on a 4x4 dyno
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details GMC Sierra 4.8 V8 302hp
The GMC Sierra 4.8 V8 302hp is equipped with a petrol engine that produces 302 HP and 414 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this GMC can achieve 320 HP (+6%) and 435 Nm (+5%).
Our Stage 1 tuning for the Sierra 2008 - 2013 delivers an impressive gain of +18 HP and +21 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code L20 identifies this specific powerplant configuration. The Delco E38 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
With 302 HP from factory, this GMC Sierra is already a performance vehicle. Our remapping extracts even more potential, delivering exhilarating acceleration and enhanced driving dynamics for enthusiasts who demand the best.
Technical Specifications — GMC Sierra 4.8 V8 302hp
Factory technical data for the GMC Sierra 4.8 V8 302hp (2008 - 2013), used by MasterTuning engineers to develop a tailored, dyno-tested remap for this specific powerplant.
| Engine code | L20 |
|---|---|
| ECU / Control unit | Delco E38 |
| Fuel | Petrol |
| Compression ratio | 8.8 |
| Bore × stroke | 96.0 X 83.0 mm |
| Stock power | 302 HP · 414 Nm |
| Remapped power (Stage 1) | 320 HP (+18) · 435 Nm (+21) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your GMC Sierra.
Frequently Asked Questions - GMC Sierra
How much power can I gain from remapping my GMC Sierra?
With MasterTuning Stage 1, your GMC Sierra 4.8 V8 302hp can gain +18 HP (from 302 to 320 HP) and +21 Nm of torque. This represents a 6% increase in power.
Is ECU remapping safe for the GMC Sierra engine?
Yes, MasterTuning's remapping for the GMC Sierra 4.8 V8 302hp is developed within safe parameters. All calibrations are tested on our 4x4 dyno and stay within the mechanical limits of the L20 engine.
Is the GMC ECU remapping reversible?
Absolutely. The original factory calibration of your GMC Sierra is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my GMC warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
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Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
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