Quote: Originally Posted by
lomedicojb 
So since I have a predator, all I have to do is install the open downpipe, and then add 5-10% fuel, retard 2 degree's of timing, and then go datalog from there and adjust as needed? What parameters will I be watching for when tuning with the open downpipe other than my a/f ratios? I will probably be running it open most of the time, so if I have it closed, would I have to worry about hurting something when I go WOT? Or will the only concern just be not going quite as fast? Basically I will not be doing two tunes, I'll just tune for the open downpipe and hopefully it'll be ok when it's closed as well. If that's not going to work, let me know. I just don't want to have to pull over and switch my tunes all the time for if it's closed or open because that will get annoying?
well what i have given you is how to set it up for a tune, add some fuel and pull some timing. street tune and slowly pull fuel till you get to 11.5-11.3 at full boost and slowly add timing untill you get no knock (if you get knock retard pull a tiny bit out in that area)
if you want to be safe just leave it tuned for open header, it will lose a tiny bit of power but be safe
