Custom ECU and transmission tuning for 2017–2020 GM full-size SUVs equipped with the Gen V 5.3L (L83) or 6.2L (L86) V8. Let our experienced team build a custom calibration for your truck. Expect a power increase of 15–40 RWHP depending on modifications, a 1–2 MPG improvement in fuel efficiency, and noticeably improved part-throttle response and drivability.
This is one of the most cost-effective upgrades available for your full-size SUV.
Supported Vehicles:
Cadillac Escalade / ESV (2017–2020)
Chevrolet Suburban (2017–2020)
Chevrolet Tahoe (2017–2020)
GMC Yukon / Yukon XL / Denali (2017–2020)
Engines & Transmissions:
5.3L V8 (L83) — Gen V, paired with 6L80E 6-speed
6.2L V8 (L86) — Gen V, paired with 8L90E 8-speed
ECM: E92 | TCM: T43 (6-speed) or T87A (8-speed)
Transmission Tuning:
We fully tune the transmission — speedometer recalibration, torque management, shift firmness, and shift points.
6L80E (5.3L): Uses the T43 controller. (InternalTCM)
8L90E (6.2L): Uses the T87A controller. (External TCM)
Octane Recommendation:
We can tune for whatever octane you prefer, but we strongly recommend premium (91+). Many of these trucks spark knock on the stock spark tables with regular fuel. Premium allows more aggressive timing, which produces the most power and the best fuel economy.
HP / Torque Estimate (Stock / Bolt-On):
5.3L L83: 15–25 RWHP / 20–30 RWTQ
6.2L L86: 25–40 RWHP / 30–45 RWTQ
Cam swaps, headers, and forced induction produce significantly larger gains.
What We Can Adjust:
Fan 1 and Fan 2 on/off temperature thresholds
90-second key-off fan run (activates above your thermostat threshold)
Active Fuel Management (AFM / DOD) disable
Variable Valve Timing (VVT) Disable
VATS / Passlock security deletes
Axle ratio change
Tire size correction
Speed limiter removal
Torque management / torque abuse mode adjustment to eliminate launch bog
Unused engine code suppression (specify in order notes)
Throttle lag removal
WOT fueling optimization
WOT spark timing optimization
Raised rev limiter
Raised shift points
Downshift table adjustment to reduce lag
Increased transmission line pressure
Year-specific MAF calibration
Power Enrichment (PE) engagement tuning to reduce knock retard
Torque converter lockup table refinement to extend transmission life and eliminate TCC hunting
VIN correction
E85 / flex fuel enable
Emissions Removal Notice:
Emissions equipment deletes (rear O2 sensors, catalytic converters, EVAP, EGR, AFM) are intended for off-road, race, or competition use only and are not legal for street-driven vehicles. Customer is responsible for compliance with all applicable federal, state, and local laws including the Clean Air Act.
Custom ECU and transmission tuning for 2017–2020 GM full-size SUVs equipped with the Gen V 5.3L (L83) or 6.2L (L86) V8. Let our experienced team build a custom calibration for your truck. Expect a power increase of 15–40 RWHP depending on modifications, a 1–2 MPG improvement in fuel efficiency, and noticeably improved part-throttle response and drivability.
This is one of the most cost-effective upgrades available for your full-size SUV.
Supported Vehicles:
Cadillac Escalade / ESV (2017–2020)
Chevrolet Suburban (2017–2020)
Chevrolet Tahoe (2017–2020)
GMC Yukon / Yukon XL / Denali (2017–2020)
Engines & Transmissions:
5.3L V8 (L83) — Gen V, paired with 6L80E 6-speed
6.2L V8 (L86) — Gen V, paired with 8L90E 8-speed
ECM: E92 | TCM: T43 (6-speed) or T87A (8-speed)
Transmission Tuning:
We fully tune the transmission — speedometer recalibration, torque management, shift firmness, and shift points.
6L80E (5.3L): Uses the T43 controller. (InternalTCM)
8L90E (6.2L): Uses the T87A controller. (External TCM)
Octane Recommendation:
We can tune for whatever octane you prefer, but we strongly recommend premium (91+). Many of these trucks spark knock on the stock spark tables with regular fuel. Premium allows more aggressive timing, which produces the most power and the best fuel economy.
HP / Torque Estimate (Stock / Bolt-On):
5.3L L83: 15–25 RWHP / 20–30 RWTQ
6.2L L86: 25–40 RWHP / 30–45 RWTQ
Cam swaps, headers, and forced induction produce significantly larger gains.
What We Can Adjust:
Fan 1 and Fan 2 on/off temperature thresholds
90-second key-off fan run (activates above your thermostat threshold)
Active Fuel Management (AFM / DOD) disable
Variable Valve Timing (VVT) Disable
VATS / Passlock security deletes
Axle ratio change
Tire size correction
Speed limiter removal
Torque management / torque abuse mode adjustment to eliminate launch bog
Unused engine code suppression (specify in order notes)
Throttle lag removal
WOT fueling optimization
WOT spark timing optimization
Raised rev limiter
Raised shift points
Downshift table adjustment to reduce lag
Increased transmission line pressure
Year-specific MAF calibration
Power Enrichment (PE) engagement tuning to reduce knock retard
Torque converter lockup table refinement to extend transmission life and eliminate TCC hunting
VIN correction
E85 / flex fuel enable
Emissions Removal Notice:
Emissions equipment deletes (rear O2 sensors, catalytic converters, EVAP, EGR, AFM) are intended for off-road, race, or competition use only and are not legal for street-driven vehicles. Customer is responsible for compliance with all applicable federal, state, and local laws including the Clean Air Act.
