programmers

[y2kz71yukon]

I would like to change the tire size on our Envoy, but I can't find a programmer (Hypertech, Superchip, etc.) to correct speedo, ABS, etc. Don't care about performance gains, (though our 4.2 could use some help) really just want the correction. Any help appreciated.

[Envoy Fan]

Talked with my GMC dealer about this last month. No help at this time from GM. Don't know of any aftermarket aids either.

 

This chart will tell you how much your speedo is off after changing tires...

 

http://www.eunos.com/tirecalc/

[Valsport]

have you checked with Granitelli motorsports? they may have a diablosport predator for the envoy

[blue2kzr2]

Wester's, sold through Tbyrne Motorsports (tbyrne on here) can re-calibrate for different tires. It's a little expensive but you also have A LOT of modifications he can program the truck for. If you look around on here, there are people seeing MPG AND performance gains, so long as they can keep their foot out of the throttle.

[Envoy Fan]

I would like to have a custom tune by Wester, Nelson, or Pcmsforless, but no one has one yet for the 4.2L I-6. They all say this is a good engine, but I don't understand why one of these custom tuners has not jumped all over this opportunity. Must be close to 1 million of the 4.2's out there now, and Colorado and Canyon are using a 4 or 5 cyl version of this engine.