Injector duty cycle Issues
#26
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Intake Vacuum Leak Physical Check
This is way old school, but if you partially block the air intake at idle and RPMs increase, rather than drop, then there definitely is a vacuum leak. Have you tried that?
Last edited by MPG > HP; 09-18-2012 at 01:04 PM.
#31
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I personally would try addressing this in the fuel table first (7500 rpm/0.6 Load/3rd gear map). Messing with the VE map effects a number of other variables. Ultimately the P2s may not match up with the OE NA transition programming
Last edited by TeamRX8; 09-20-2012 at 09:50 PM.
#32
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at 60% load and or a certain % of throttle position the fuel pump voltage changes.
I would think that you may want to check the fuel pressures during these periods. It is just another metric you want to eliminate before you start chasing tuning.
The fpr is supposed to supply a constant pressure--very true. But you never know and it is a variable that could have this type of affect. Especially when you are such a high rpm and only using very light throttle.
It probably is NOT Fp related---but it could be.
I would think that you may want to check the fuel pressures during these periods. It is just another metric you want to eliminate before you start chasing tuning.
The fpr is supposed to supply a constant pressure--very true. But you never know and it is a variable that could have this type of affect. Especially when you are such a high rpm and only using very light throttle.
It probably is NOT Fp related---but it could be.
#34
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you are thinking in one dimension.
If the fuel pump is switching from low to high speed,or high speed to low speed functioning it is possible to have fluctuating fuel pressures. If that is happening then the the a/f's theoretically could be bouncing around.
It would be interesting to do primary testing of the fuel delivery system constancy during the milliseconds that are being questioned.
If the fuel pump is switching from low to high speed,or high speed to low speed functioning it is possible to have fluctuating fuel pressures. If that is happening then the the a/f's theoretically could be bouncing around.
It would be interesting to do primary testing of the fuel delivery system constancy during the milliseconds that are being questioned.
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