A guy I know put a 2.80 pulley, NGK TR6 plugs, and a Diablo chip on his '03 Cobra. Then he had it dyno'd on a "Mustang" dyno, which showed consistent a/f ratios of 13.2 or so until 3900 rpm, at which point it dropped to 12.7 or so until shut down at 6000 rpms. I told him it was waaaay too lean; should be running closer to 11.0 or so. I am by no means an expert on this, and was wondering what others might think. He is planning on installing the ls1motorsport 3" stainless exhaust soon, and I think he's really risking getting even leaner still.
BTW, he had stock cat-back and silencer removed, but only turned 385 RWHP. The a/f sampling was done with sensors installed in the front O2 sensor bungs.
/puzzled/
Thanks for any advice,
CW:shrug:
BTW, he had stock cat-back and silencer removed, but only turned 385 RWHP. The a/f sampling was done with sensors installed in the front O2 sensor bungs.
/puzzled/
Thanks for any advice,
CW:shrug: