Not sure if I should post here or in 'Fueling'. I just tuned a C5 that we put an ATI supercharger on. Changed injectors to SVO 42# and adjusted flow rate OK but not offset. While monitoring with EASE and running on a dyno, all fueling looks great except at idle where it goes pig rich. Out of FTC 19 everything goes to normal. The MAF raw frequency is in 3400-3500 range, which is really high. Any ideas why this is happening, or a fix?

 

Just tweak the MAF rate below 5000hz and tell the pcm you are flowing less air than it expects. You can smooth it a bit at the first few cells for a smooth transistion.

I think the issue is really the offset but I'm not comfortable in tweaking that (my ignorance of how how offset works )