Lifetime Premium Member
Join Date: Jul 2012
Location: Middle River, MD
Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...
I know Wayne has a stick car. Are you other guys getting popping with stick or auto?
I've never had, or heard a pop in mine, ever, but it's a sissy stick, aka automatic, lol.
Exhaust popping on decel is NOT NORMAL, but can surely be tuned out.
My daily driver truck, is tuned via HPTuners. I have the Decel Fuel Cut Off (DFCO) pretty aggressively to try and get a little better mileage. It definitely burbles and gurgles (like popping) on decel, when in DFCO mode...I'm thinking that must be what's happening, at least in Wayne's case.
Possibly having the DFCO in play for too long, and when it dumps some fuel to re-wet the cylinders as it's coming off/out of DFCO mode, it causes a pop due to the excess fuel.
I'm thinking maybe since I have an automatic, the DFCO related RPM drop isn't as severe, so not noticeable, or maybe not even there on my car???
Does that make sense to anyone?
1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI