True that stock calibrations run a rather rich mixture. They do that so that your cat converter doesn't turn into a molten ball of fire
. In a sence they're "putting out" your cat, if you don't do this your cat will live a rather short life. Newer cars do it differently but up until 99 that's how GM was doing there calibrations
.
If you don't have a cat, lean it out a bit but ALWAYS have a way of measuring improvements. Don't go by the butt dyno, those are rarely accurate.
__________________
, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue
