Z28KLR

So today I went to change from "performance tune" to "factory HP tune" so I can go back to 87 octane for a little while. I modified parameters with the factory hp tune the same as was the performance tune (all OBD-II except for egr switch turned to off because of my o/r midpipe, and set axle ratio to 4.09).

For whatever reason the speedometer reads approximately 20-25 mph faster than actual speed. I double checked all of the modified parameters just to make sure, even restored factory tune and then reloaded the "hp tune" (made sure it was set to "manual trans") and modified the parameters again as mentioned above with the same results.

Long story short, for now I just reloaded the performance tune with modified parameters and everything's good again, but I'd like to know what's up with the "factory HP tune" axle ratio parameter not working as it should.

Mike@DiabloSport

You running the latest revision?

Z28KLR

No, I was unaware that there were any software revisions or updates. I'll check Diablosport's site and see what I can find out.

Brodiemannn

Im having the same problem, where can i check the revision?

Mike@DiabloSport

Top line of the main menu on the Predator screen.