backfire
09-29-2010, 10:08 PM
#16
Racer
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No, the venturi delete does not delete the ISV. There is a metal pipe underneath the intake manifold. That is the venturi tube, which is what gets deleted. It also deletes the cycling valve (factory boost controller). You will need an aftermarket electric or manual boost controller if you do this.
09-30-2010, 11:43 AM
#17
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People with whom I tracked in 944T's and I used to compare how much flame we could shoot at the track.
The gasoline in the pipes has momentum and, even though the electronic signal changes instantaneously, some gasoline continues flowing because the energy in the flowing gas forces the control open.......flame......
The gasoline in the pipes has momentum and, even though the electronic signal changes instantaneously, some gasoline continues flowing because the energy in the flowing gas forces the control open.......flame......
10-01-2010, 01:32 AM
#18
Three Wheelin'
To the OP, keep in mind though that turbo cars naturally pop and sputter with small amounts of unburnt fuel going out the exhaust. The high heat from the turbo can heat up that fuel to the point of ignition as it exits the back and makes for nice fireworks for the car behind you. So my guess is you're running slightly rich on off-throttle applications. The flames are probably because you're running with no cat.
10-01-2010, 01:52 AM
#19
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i dont have flames yet. haha. but sometimes my gauge shows im running rich when it usually says nothing on the gauge when decelerating in gear. because it doesnt seem consistent i thought something might be off. then again, im a noob and still learning
10-01-2010, 09:05 AM
#20
Drifting
To the OP, keep in mind though that turbo cars naturally pop and sputter with small amounts of unburnt fuel going out the exhaust. The high heat from the turbo can heat up that fuel to the point of ignition as it exits the back and makes for nice fireworks for the car behind you. So my guess is you're running slightly rich on off-throttle applications. The flames are probably because you're running with no cat.
10-01-2010, 01:46 PM
#23
Three Wheelin'
I have a straight through exhaust, I have backfiring/flames on fast upshifts, and backfiring on downshifts.
However, check the TPS for proper adjustment. When its adjusted improperly, it will backfire several times when you downshift ( and not engine brake very well ), indicating the DME is still seeing a part throttle signal with the throttle released.
If all that is in order, some backfiring is normal.
However, check the TPS for proper adjustment. When its adjusted improperly, it will backfire several times when you downshift ( and not engine brake very well ), indicating the DME is still seeing a part throttle signal with the throttle released.
If all that is in order, some backfiring is normal.
10-01-2010, 06:54 PM
#25
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I have a straight through exhaust, I have backfiring/flames on fast upshifts, and backfiring on downshifts.
However, check the TPS for proper adjustment. When its adjusted improperly, it will backfire several times when you downshift ( and not engine brake very well ), indicating the DME is still seeing a part throttle signal with the throttle released.
If all that is in order, some backfiring is normal.
However, check the TPS for proper adjustment. When its adjusted improperly, it will backfire several times when you downshift ( and not engine brake very well ), indicating the DME is still seeing a part throttle signal with the throttle released.
If all that is in order, some backfiring is normal.
