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Old 06-16-2011, 08:56 AM   #1
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Default 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.
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Old 06-16-2011, 09:07 AM   #2
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Do you have no-lift-shift activated?
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Old 06-16-2011, 09:15 AM   #3
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Quote:
Originally Posted by Doppelgänger View Post
Do you have no-lift-shift activated?
Yes I do
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Old 06-16-2011, 09:37 AM   #4
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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.
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Old 06-16-2011, 09:42 AM   #5
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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.
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