2024 GMC Sierra AT4X 1500 Whipple 3.0L Supercharger Package
Project Overview
This 2024 GMC Sierra AT4X arrived already loaded with upgrades but needed professional calibration to make everything work in harmony. The truck’s stock L87 had been replaced with a forged-internal L86 built by Golen Engine, featuring a Stage 3 camshaft, Whipple 3.0L supercharger, Nick Williams 103mm throttle body, long-tube headers, LT4 fuel system, triple in-tank fuel pumps, and a 3200 stall converter.
Specs
- Platform:
- 2024 GMC Sierra AT4X
- Engine:
- L86 built with forged pistons and rods
- Drivetrain:
- Stock 10Spd w/ 3200 stall converter
- Brakes:
- Stock
- Wheel/Tire:
- 35" Tires
- Audio & Connect:
- Stock
- Interior:
- Stock
- Baseline:
- Est. 350 HP / 383 dFtLb
- Final Output:
- 675 HP / 566 dFtLb
- Dyno:
- Mainline ProHub Dyno
Engine & Transmission Calibration
We began by unlocking the ECM through Trifecta Performance, allowing full access for tuning all the engine modifications. With careful calibration on our Mainline Hub Dyno, we dialed in fueling, boost, and drivability to safely extract every bit of performance from the combination—resulting in 675 HP and 566 lb-ft of torque.
To make the most of the upgraded converter, we also installed an unlocked TCM from HP Tuners, giving precise control over shift timing and converter behavior. The result is a powerful yet refined setup that delivers massive power with smooth drivability—exactly what this AT4X needed to back up its aggressive look.
Dyno Results
Note: Forged L86 by Golen Engine · Stage 3 Camshaft · Whipple 3.0L Supercharger · LT4 Fuel System · Triple In-Tank Pumps · HP Tuners TCM Calibration
