Backfiring on rev matching
 

Hey guys,

I've had this happen enough times now to call it a problem. While at the track coming into a slow corner off a high speed run I'll begin downshifting and rev matching a couple gears. Sometimes it works without any issues but other times I just get a load of backfire and the revs don't climb. What would this be caused by, too much fuel for transient throttle? It only happens at the track, never on the street. I haven't captured any logs while this is happening.

I'm only running 10psi, so I wouldn't think it's spark blowout. And throttle blips might ever only see 1-2psi.

Do you have no-lift-shift activated?

Yes I do

Well, there is your problem. Turn it off and see what happens. I might not be right but when I've run NLS, if I don't rev just right and use the clutch just right, the ECU will still think the enigne is under load and activate NLS settings even when you're trying to heel-toe downshift. I don't exactly know how it works...hopefully someone else can explain it better. NLS is kinda fun in traffic.

I'll try that. But my settings only allow it to activate above 6500rpm....Maybe my throttle blips get it that high, I haven't really watched that closely.