s14sliding

I'm trying to figure out which vac port to use for the fuel pressure regulator. It's an s13 sr20det with greddy style intake manifold. As you can see in the pic one port I need to get a nipple for. But those are the only vac sources at the TB. I have 3 nor vac sources under the plenum which one I'm using your map sensor. Other 2 are free. Thanks for any info guys.


uploadfromtaptalk1392864808396.jpg


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s14sliding

Here's a better pic of the TBuploadfromtaptalk1392865501063.jpg

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crazywoody

Your pictures are not the best but i believe its the small one directly on the TB.

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s14sliding

the first pic i just wanted to show the vacuum sources i have up at the TB the second pic well that didnt come out to well lol

OnTheChip

There should be a port that's behind the throttle plate for the FPR.

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s14sliding

Only vacuum sources I have near the throttle body are the three shown in the first picture. One looks to be going directly into the throttle body and the other two are behind the throttle on the actual manifold itself.

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cotbu

The ones you want to use for vacuum, for the fpr are on the manifold. either one will work, choose by size if they are different.

if you look at the bottom nipple on the throttle body, you can see that it is, in front of the throttle plate. We call this a boost only source. Even though that is incorrect, it sees vacuum when the throttle plate is cracked open. Not what you want for the fpr vacuum.

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jr_ss

Cotbu is correct. Any source AT the throttle body is considered a "boost" source only. Some of those lines on your TB are coolant ports as well, not sources at all.

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s14sliding

i was thinking of using one of the vac ports under the plenum for the FPR. Not sure if thats a good idea though? if not I`ll def be using one of the two ports after the TB.

s14sliding

Yes i know some are coolant lines. So the smaller Vac nipple at the TB would that be good for say a boost gauge?

sil80dude

Just run it off that little one on the right of the TB. Go to the hardware store and get a little copper "T" and just T into it.

codyace

There should be three ports on the bottom of the Freddy manifold too. 1/8" NPT thread. Get a nipple and run a dedicated line for the FPR.

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s14sliding

Yes thank you that is exactly what I'm going to do.

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