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Old 10-11-2001, 05:09 PM   #1
Scoobie Steve
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Subaru L Ver 6 STi Type R

Default Idle Air Valve Question

Where should this be hooked up, before or after the turbo. I have mine hooked up before the turbo and i think it is returning the boost back to the intake, like a BOV. Would there be any problems hooking it up to the pressure side of the intake.
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Old 10-12-2001, 01:57 AM   #2
kaos200
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Default

What??
Do you mean the Idle air control valve? (IAC)
Why are you installing another one?
they are supposed to go from the "boosted" side. To the intake manifold AFTER the TB.
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Old 10-12-2001, 04:28 AM   #3
HndaTch627
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i am lost as to why he is even playing with his IAC(Idle Air Control)

Jeremy
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Old 10-12-2001, 04:52 AM   #4
Eric SS
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swap and N20. gone. : (

Default

I'm kinda lost also...

Eric
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Old 10-12-2001, 07:42 PM   #5
Scoobie Steve
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Default

Sorry to confuse, i should have mentioned it is a 2.2l, it has a IAC valve on the side of the intake(not the TB). In stock form a 1/2 hose ran from the intake piping to the IAC Valve. Now that the car is turboed i wanted to know where i should hook it up, Before or after the turbo?
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Old 10-12-2001, 07:51 PM   #6
kaos200
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after, or else if you put it preturbo, when the turbo is sucking air, it would also be taking (trying to atleast) air from the valve, and that could cause leakage problems
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Old 10-12-2001, 10:15 PM   #7
MZM
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Impreza 93 STI

Default IAC hookup

Hi Scoobie.

Quote:
i should have mentioned it is a 2.2l, it has a IAC valve on the side of the intake(not the TB). In stock form a 1/2 hose ran from the intake piping to the IAC Valve. Now that the car is turboed i wanted to know where i should hook it up, Before or after the turbo?
I think you mean where do you connect the inlet 1/2" hose for the IAC, correct? If this is the case , fabricate a filtered air source after the air cleaner and before the turbo inlet. There is likely already is such an outlet if you use the standard aftermarket intakes available. This is the source of air for idling and starting, so you don't want boost pressure into the IAC. Does this answer the question?

Mike McBride
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Old 10-12-2001, 10:50 PM   #8
kaos200
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Default Re: IAC hookup

Quote:
Originally posted by MZM
Hi Scoobie.



This is the source of air for idling and starting, so you don't want boost pressure into the IAC.

Mike McBride
WOW you get boost pressure at idle and starting, damn how small is that turbo!@!?
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Old 10-13-2001, 03:15 AM   #9
MZM
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Default Comedian

Quote:
kaos200 WOW you get boost pressure at idle and starting, damn how small is that turbo!@!?
Kaos you are a funny guy. In the interest of imperical scientific evaluation, plug your IAC inlet on the boost side of your turbo and report back about what happened.

MM
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Old 10-13-2001, 03:57 AM   #10
kaos200
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Quote:
Originally posted by MZM


Kaos you are a funny guy. In the interest of imperical scientific evaluation, plug your IAC inlet on the boost side of your turbo and report back about what happened.

MM
hehe, already did. Ran normal, Idled normal, started normal
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