boomers03gmc

ok i have hptuners. im a little confused with everyone talkin about how "the computer needs to learn a tune," and "after about 500 miles u will notice your tune gets better." cause when i change things with my pcm. they are instant. it doesnt take a few days of driving around for me to notice them. if i add a lot of line pressure it changes right then and gets more firm. same with timing exc. same with tuning a truck on a dyno. a dyno tuner can get 20-30 hp out of a pcm with in an hour on the dyno and the gains are instant.


so am i missing sumthing here? is there a difference in changing the pcm compared to rewriting it. either way they can be competley new to the truck.

explain please

boomers03gmc

any one?

P Mack

iTrader: (6)

You're not missing anything. The only things that really learn are fuel trims and idle trims, and if you get all the tables right they shouldn't need to learn anyway.