UltraPower GM / Workhorse 8.1L Custom Tuning (ECM & TCM)
Most orders are shipped within 24 hours from the order date. Orders placed on the weekend or after cutoff on Friday, and orders placed on select holidays are processed on the next business day. Please see our shipping terms for more information.
We are now offering 5-speed Allison Transmission tuning for 2001-2005 model years. The main change you will notice is the transmission will shift into overdrive below 50 MPH when under light throttle. We also demand more load before it will downshift when pulling hills which means less downshifting. Increased line pressures also helps prolong the life of the transmission and optimizes the shift points.
If you have a non-Allison equipped vehicle or a 2006+ with 6 speed transmission, change the quantity of the UPTCM to zero (0)
- 2001-2011 Workhorse Chassis with 8.1L
- 2001-2007 GM Pickup Trucks and SUV’s with 8.1L (May require Passkey and Crankshaft Relearn Procedure
- 2001-2010 Chevrolet Kodiak and GMC Topkick with 8.1L
The GM 8.1L UltraPower ECM has long been the ultimate performance modification you can make to your GM 8.1L powered RV or truck with the highest power gains on the market! Thousands of satisfied customers have reported fuel economy increases as well as less transmission downshifting because of the increased horsepower and torque. The UltraPower ECM performs very well on both stock engines and ones that have been upgraded with other modifications.
What sets us apart from the others? Banks even admits their handheld AutoMind only changes one parameter within the computer, whereas UltraPower changes approximately 400 parameters. That is the difference between cookie-cutter and custom!
While most tuners rely on “canned” tune files (not custom), our GM 8.1L Custom Tuned ECM is tailored specifically to YOUR vehicle. We require the VIN so that we can pull up your vehicle’s specific parameters and create a truly customized tune for your vehicle.
UltraPower 8.1L ECM Benefits:
- Fuel mileage improvement of up to 1 MPG
- Gains of 50-60 Horsepower and Torque Gains of 70-80 lb-ft
- Maintains speed and higher gears when climbing hills
- Improved throttle response coupled with more power makes driving more enjoyable
- Includes a datalogger that you plug into the OBD2 for us to analyze and optimize engine efficiency and performance
INSTALLATION INSTRUCTIONS (Workhorse Application)
ECM Removal Video (Workhorse Application):
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