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07-02-2021, 01:12 PM | #11 |
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Re: Xfi 2.0 question on lt1
Idle Air Control - it's a computer controlled (sometimes poorly) air leak into the intake that a race car doesn't normally need.
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Phil Molski PMR Performance S/C 1623 |
07-02-2021, 03:35 PM | #12 |
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Re: Xfi 2.0 question on lt1
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07-02-2021, 04:18 PM | #13 | |
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Re: Xfi 2.0 question on lt1
Quote:
There was also something to do with the emissions. I cant remember all the details, but the engines needed to idle faster while getting the 02's up and heated ( they don't work when their cold) so the closed loop could handle the emissions issues. During that short "heating period" time the emissions went out of wack. So they "Idled up" for a few seconds on a startup/restart to keep the emissions down during that short period until they switched over to Closed Loop. Usually around 7 seconds
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Jeff Niceswanger 3740 SS Last edited by Jeff Niceswanger; 07-02-2021 at 04:48 PM. |
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07-02-2021, 05:33 PM | #14 |
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Re: Xfi 2.0 question on lt1
Got it...
Kinda what I suspected... Is it tied physically to the throttle shaft or just lean/rich the mixture via controlled air leak?... A friend resto-modded his street car with an LS-X and it hunts at idle... Doesn't really seem to run like I would have expected a computer controlled car to run. Seems rich all the time too... Sorry for the questions but I really don't know anything about modern fuel injection. Trying to learn. If it ain't got pills or jets I'm lost!... |
07-02-2021, 05:44 PM | #15 | |
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Re: Xfi 2.0 question on lt1
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Jeff Niceswanger 3740 SS |
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07-02-2021, 05:56 PM | #16 |
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Re: Xfi 2.0 question on lt1
Will disconnecting the IAC hurt the performance performance of ET or MPH?
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07-02-2021, 06:18 PM | #17 |
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Re: Xfi 2.0 question on lt1
Nope.
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Phil Molski PMR Performance S/C 1623 |
07-02-2021, 06:30 PM | #18 | |
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Re: Xfi 2.0 question on lt1
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Makes sense. Can I PM you some day with more questions? (rather than stepping on this thread) |
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07-02-2021, 07:29 PM | #19 |
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Re: Xfi 2.0 question on lt1
Sure, anytime
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07-02-2021, 11:13 PM | #20 |
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Re: Xfi 2.0 question on lt1
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