MINIMAX Upgrades

mileage, but we honestly were not easy on the throttle and did not have enough time behind the wheel to log definitive fuel mileage improvements. We suspect that drivers will pick up 1-2 mpg if they can control their right foot and maintain similar driving habits. But of course power is addictive, so it is highly possible that your mileage may vary!

The DSP4 switch uses an OBD interface cable that has a pass through allowing the OBD-II diagnostic port to still be used without requiring the switch to be unplugged from the truck. After Delo completed the tie rod sleeve installation he installed the DSP4 switch in the Colorado and finishd in less than 30 minutes even while we slowed him down with our photography. He chose to mount the switch below the dash near the center console where it would be out of the way yet easy to access to change power levels. He routed the cable along the bottom of the dash, securing it with cable clamps and secured the slack with zip-ties. After the DSP4 switch was installed, Bob Peterson from Duramax Tuner flashed their tune files into the truck using his laptop PC and an EFILIVE V2 interface.

During testing, the steering felt solid and secure and the power delivery was smooth with noticeably more grunt from the little 4-cylinder Duramax mill, especially in the high-power Duramax Tuner “Performance Tune” mode that delivers 52 extra horsepower and an additional 80 lb-ft of torque to the rear wheels.

 Then the sleeve can be tightened against the tie rod end, acting as the jam nut to replace the factory jam nut that was removed earlier.

 After reinstalling the wheel, Delo checks the torque on each lug nut. It is a good idea to re-check the torque after driving the vehicle for the first time and again after 500 miles.

 Delo drills a mounting hole for the DSP4 switch under the dash near the center console, where it will be out of harm’s way but easy to reach to change tunes on the fly.

 The Socal Diesel DSP4 switch will be used in conjunction with Duramax Tuner tunes to improve the power and performance of the 2.8L LWN Duramax 4-cylinder engine and 6L50 transmission.

 Once the sleeve is installed and measured he reinstalls the tie rod end before reinstalling it in the spindle.

 The switch fits perfectly and is secured with the included mounting hardware.