Originally Posted by kelvash2000
hey guy i was just wondering what could cause my 03 excursion 6.0 to run slower with my custom tunes. with the performance tune that comes with sct i ran a 14.9 at the track but when i put it on my xtreme street from IDP it runs a 15.3 and same with another custom tune i got from Truck source diesel is san antonio. It runs fine and the tranny does not feel like its slipping or anything.yall got any ideas?
Tune may need a little adjustment? I'm sure IDP will take care of you, by the way.
Did the truck spin off the line with the custom tunes?
Runnin in 4x4 or 2?