Discussion Starter · #1 ·
Within the last month I have been getting more after fire then normal, I used to get just on downshifts at low rpms. Now I get it more offer, letting off in 1st in parking lots (it's funny as hell to see people jump XD) a few times letting off on the highway around 85 at 2500 to 3000. Now I have a blown gasket connecting the main pipe to the muffler. I currently have a full exhaust (4-2-1 header, manga flow hi flow, Megan cat back) as well as a lightly built up engine (03 qr block 07+ internals, stage 2 cams, 10:1 compression) at first I thought I was just running rich and needed to tune (haven't had the time to tune yet) so I was just going to remake some gaskets that were stronger (high temp copper core, hi temp goop, and stainless outer) I went to auto zone to look for some of the material I needed and while there the guy behind the counter suggested my timing could be the cause of the after fire. He seems to think that my exhaust value is opening to early. Is it timing? Is so how do we with qrs adjust? Can we advance/retard our timing?