idle valve on thottle body - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-09-2010, 02:06 AM   #1
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Default idle valve on thottle body

Does this have to be connected to the intake tract?

Can I instead just mount a small filter?

Reason I ask is because the intercooler pipe kit i have was made for my old 93 that had it on the opposite side... routing the hose to bend around is a pain in the *** right now, and ive had to set my idle artificialy high to compensate cause it just a kinked no-flow mess.

Is this going to mess anything up in megasquirt besides the fact that i need to tune the idle properly now?

Do I need to mount a one way check valve, or should it close when under boost?
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Old 02-09-2010, 02:32 AM   #2
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Yeah, you can just throw a filter on it.
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Old 02-10-2010, 08:31 PM   #3
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I remember reading somewhere in this forum that, under boost, the idle valve will be pushed the other way and will leak.
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Old 02-10-2010, 08:34 PM   #4
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It will leak. I believe it was magna that tried to put a piece of broom handle in his and it ended up ejecting it at high speed :P.
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Old 02-10-2010, 09:00 PM   #5
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Quote:
Originally Posted by Jeff_Ciesielski View Post
It will leak. I believe it was magna that tried to put a piece of broom handle in his and it ended up ejecting it at high speed :P.
Pics or it didnt happen!
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Old 02-10-2010, 09:24 PM   #6
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Quote:
Originally Posted by SKMetalworks View Post
Pics or it didnt happen!
Happened to me when I was troubleshooting my idle valve. Mine was a bung plug though, not a broom handle =P I swear I didn't even get 9psi before I heard it shoot out and hit my hood from the inside lol.
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Old 02-19-2010, 01:05 AM   #7
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Interesting. I've had mine plumbed to atmosphere forever. I should throw the 2001 throttle body in there (plumbed in through the TB casting).
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Old 02-19-2010, 05:59 AM   #8
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Sav, I think it varies on your valve, I've placed a 1-way valve inline with a mini filter on my IAC and noticed no increase in MAP, it hummed like a bitch at idle too so I removed it.
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Old 02-19-2010, 06:25 AM   #9
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I noticed a difference in power when I removed my VTA idle valve, enough of a difference that I'd say it'd been a boost leak the whole time.
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Old 02-19-2010, 11:22 AM   #10
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Quote:
Originally Posted by richyvrlimited View Post
it hummed like a bitch at idle too so I removed it.
Set your PWM multiplier to 10 and it will go away.

Jim
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Old 02-19-2010, 03:13 PM   #11
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Originally Posted by Reverant View Post
Set your PWM multiplier to 10 and it will go away.

Jim
It wasn't/isn't the IAC that was humming it was the 1 way valve
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