This has been haunting me for as long as I can remember but I thought I'd try to pick everyone's brain one more time.
My car continues to backfire when I shift gears. It actually backfires when I get back on the throttle after shifting slowly especially at low RPM's. If I shift quickly and over 3000 rpm, it does not backfire. Seems like a build up of fuel between shifts that re ignites.
I think it is worse since I installed my aluminum flywheel as the engine speed drops rapidly between shifts.
Here's the specs on the engine:
550's
Walbro and fpr
CT26 54 trim
15 lbs boost
3" exhaust with CAT
Lexus afm
BOV vented to atmosphere
Apexi SAFC version 1 - pulling up to 22% fuel at wot and full boost
Checked for vacuum, exhaust and intake leaks and none found
Reset TPS
Throttle linkage dash pot ok
AFR's 14.5 at idle and cruising. 11.0 to 11.5 under boost.
Can't recall fuel pressure
The only thing that I have never changed is the ECU.
Lmk what you think.
Thx
My car continues to backfire when I shift gears. It actually backfires when I get back on the throttle after shifting slowly especially at low RPM's. If I shift quickly and over 3000 rpm, it does not backfire. Seems like a build up of fuel between shifts that re ignites.
I think it is worse since I installed my aluminum flywheel as the engine speed drops rapidly between shifts.
Here's the specs on the engine:
550's
Walbro and fpr
CT26 54 trim
15 lbs boost
3" exhaust with CAT
Lexus afm
BOV vented to atmosphere
Apexi SAFC version 1 - pulling up to 22% fuel at wot and full boost
Checked for vacuum, exhaust and intake leaks and none found
Reset TPS
Throttle linkage dash pot ok
AFR's 14.5 at idle and cruising. 11.0 to 11.5 under boost.
Can't recall fuel pressure
The only thing that I have never changed is the ECU.
Lmk what you think.
Thx