This is for anybody who has done a IAC restrictor mod to fix those annoying GT revs.
Ever since day one for me I have never gotten it really *right*. My copper cap is probably a tab bit too restrictive at the moment, but that probably doesn't relate to the problem. To my experience so far the effects of the cap affect the idle, between shifts, and engine braking (every instance where my foot's off the gas). The only area of benefit seems to be between shifts, which is the whole point of the mod, and is something I really can't live without anymore.
Which sucks because the low startup idle is painful in the cold weather and the engine braking is much more jolty (feels like the same drivetrain slack you would normally feel but worsened). I have grown a habit to never entirely let off the gas to engine brake, rather just ease it in, and to add gas on a cold startup to the regular 1100-1200 warm up RPM period.
All of these downsides are fine by me if I can have my quick shifts, but another thought keeps nagging on me now. Does this IAC mod cause me to run richer? I notice when I first start up and rev a little the car sounds really badass, almost gurgly as the revs come up and down superfast. But after a few minutes of driving the tone softens and the revs slow a lot more, as if the computer were adapting to something. Something such as an abnormal restriction of airflow, and remedying that by adding more gas. I still get slightly faster shifts but the effect is clearly changed. I don't want to be running needlessly rich all the time if that is indeed the case.
Does this sound right to anybody else? I almost can't live without this mod, but I won't run it if it will be doing so much more negative than positive.
Ever since day one for me I have never gotten it really *right*. My copper cap is probably a tab bit too restrictive at the moment, but that probably doesn't relate to the problem. To my experience so far the effects of the cap affect the idle, between shifts, and engine braking (every instance where my foot's off the gas). The only area of benefit seems to be between shifts, which is the whole point of the mod, and is something I really can't live without anymore.
Which sucks because the low startup idle is painful in the cold weather and the engine braking is much more jolty (feels like the same drivetrain slack you would normally feel but worsened). I have grown a habit to never entirely let off the gas to engine brake, rather just ease it in, and to add gas on a cold startup to the regular 1100-1200 warm up RPM period.
All of these downsides are fine by me if I can have my quick shifts, but another thought keeps nagging on me now. Does this IAC mod cause me to run richer? I notice when I first start up and rev a little the car sounds really badass, almost gurgly as the revs come up and down superfast. But after a few minutes of driving the tone softens and the revs slow a lot more, as if the computer were adapting to something. Something such as an abnormal restriction of airflow, and remedying that by adding more gas. I still get slightly faster shifts but the effect is clearly changed. I don't want to be running needlessly rich all the time if that is indeed the case.
Does this sound right to anybody else? I almost can't live without this mod, but I won't run it if it will be doing so much more negative than positive.