2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Those with FD upper intakes

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Old Sep 21, 2012 | 04:44 PM
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Those with FD upper intakes

which ports did you hook up the injector air bleeds and omp injector vacuum lines to?

that is all.

thanks.
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Old Sep 21, 2012 | 10:56 PM
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I used the air bleeds as a vacuum source and I have no oil injectors.
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Old Sep 22, 2012 | 12:14 AM
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I capped all my bleeds(removed diffusors) and i premix so...good luck!
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Old Sep 22, 2012 | 06:38 AM
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I run the omp spider to the port on the lim
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Old Sep 22, 2012 | 08:16 AM
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I decided to remove the omp and pre-mix only.

Last edited by tuscanidream; Sep 22, 2012 at 08:19 AM.
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Old Sep 23, 2012 | 11:34 AM
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i as well removed everything and going to use pre-mix.
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Old Sep 23, 2012 | 12:59 PM
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there's no real port large enough on the FD UIM to match the spider. you could taper it down to a normal vacuum line and run it to one of the pre throttle body ports but it won't flow air sufficiently.

running the spider to a port on the LIM draws air the reverse direction so the injectors won't work properly!
the FD pulled air from the charge pipe right off the twins which is a static air port, do not hook them up to a vacuum port.

only spot that may work is the PCV valve port, but i have not checked to see if it is static pre throttle body or if it is a post vacuum port, most boingers they are hooked to vacuum post throttle body which will not work for this application. best bet would be pairing the injectors and running 2 to a single static port per pair.
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Old Sep 24, 2012 | 10:42 AM
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Originally Posted by RotaryEvolution
there's no real port large enough on the FD UIM to match the spider. you could taper it down to a normal vacuum line and run it to one of the pre throttle body ports but it won't flow air sufficiently.

running the spider to a port on the LIM draws air the reverse direction so the injectors won't work properly!
the FD pulled air from the charge pipe right off the twins which is a static air port, do not hook them up to a vacuum port.

only spot that may work is the PCV valve port, but i have not checked to see if it is static pre throttle body or if it is a post vacuum port, most boingers they are hooked to vacuum post throttle body which will not work for this application. best bet would be pairing the injectors and running 2 to a single static port per pair.
Thank you for a detailed and informative response. ive been hoping someone would give me some info. so basically i just need both hooked up before the throttle body? if i understand correctly they just cant see vacuum right?

do u know which ports on the uim are the static ports?
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Old Sep 24, 2012 | 12:11 PM
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I drilled and tapped the bottom of the TB into the non vacuum passage for the idle air screw passage.

I put a large 90 nipple there to feed my oil injector tops and fuel injector airbleeds.
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Old Sep 24, 2012 | 12:13 PM
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i'd have to do an airflow test to figure out which are and which aren't, most on the FD are vacuum ports but not all. if you blow air into the port and it comes out before the butterflies upstream then it should be a static port. or you can run the engine and hook up a vacuum gauge to each port, if it registers vacuum then it's not a suitable port.
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Old Sep 24, 2012 | 03:26 PM
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Originally Posted by BLUE TII
I drilled and tapped the bottom of the TB into the non vacuum passage for the idle air screw passage.

I put a large 90 nipple there to feed my oil injector tops and fuel injector airbleeds.
do you have pics of this or can show/explain where?
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Old Sep 24, 2012 | 07:44 PM
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I'd like to kno to
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Old Sep 29, 2012 | 04:30 PM
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so would it be best to hook these up between the turbo and the throttle body, or before the turbo in the intake? should they see no vac or no boost?
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Old Sep 29, 2012 | 04:37 PM
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On the FC, air for injectors and OMP are pulled from before the throttle plate in the charge air stream. You could take your intercooler pipe and then tap it with fittings.
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Old Sep 30, 2012 | 08:22 AM
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Originally Posted by arghx
On the FC, air for injectors and OMP are pulled from before the throttle plate in the charge air stream. You could take your intercooler pipe and then tap it with fittings.
I did this on my old set up, in the greddy elbow
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Old Sep 30, 2012 | 12:47 PM
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thanks guys, i might use the 3/4" port in the back of the stock elbow to provide airflow, anyone see a problem with this?
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