Trying to tune a 427 in a 2013 Camaro, its an LQ4 block with LS3 heads and intake, and a big cam .600+ big, 2" long tube headers. No VVT or DOD, what I cant get around is a popping noise and some back fires around 2000-3000 after shifts and lugging it before passing gear. I have tried everything I can think of from shuting down VVT tables and Oil pressure enable disables, timing give it more or take it away, have though about messing with the DFCO, the MAF curve tuning helped the car in the fuel trims but not with the popping. Out of ideas. Any help will be greatly appreciated.
I will load a log file and tune file shortly.
Holden