Quote:
Originally Posted by C5GTO
Questions:
5) After muffler replacement, did you need to "re-tune" the motor because of back pressure change. I've had my EFI computer calibrated on a dyno to get A/F ratio right. Will I need to have it re-calibrated because the lower back pressure could introduce a risk of an overly lean condition?
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If you have Mass flow EFI (has a mass meter in the intake piping) I doubt there will be any tuning changes needed. If it is speed density (MAP sensor) you may need some tuning. If it is alpha-n (uses throttle position only) it definately will need tuning.
Even Mass Flow has a Alpha-N type table that is used when the MAF fails. That table is also used during rapid throttle changes, when the MAF is not fast enough to give accurate data. It is not a precise control strategy. I do not think it will matter, but you may want to speak to someone more knowledgeable.