Quote:
Originally Posted by swchopper
I am going to attempt this. You're not the first to tell me about richening it up. It still is hard to get that thru my thick skull, doesn't seem to make sense. But I trust you're experience, so that's what I'm going to try and do. Thanks!  |
you are correct, it seems opposite of what your brain would tell you. But it is true, at least with the aftermarket speed density systems like Accel, BigStuff 3, FAST, etc.
I had to pull over on the way to Hot August Nights with the Chevelle and richen the entire fuel map 30%. It was dead lean at about 5000 ft altitude. After I richened the map I also allowed minus and plus 25% of fuel adding/subtracting through the computer, and the same high altitude tune ran perfect down at sea level. That is how a local tuner gets them to run at altitude and sea level. By the way, mine is Bigstuff 3 with altitude compensation, but it won't work at higher elevations, maybe good to 2500-3000' feet at best.
Jody