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Thread: afpr and boost controller are on the same vacuum line

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    Forum User Feedback Score 0 b3kgt's Avatar
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    afpr and boost controller are on the same vacuum line

    just installed an automotive afpr and the afpr and boost controller are on the same vacuum line on the back of the plenum. but the boost controller needs a uninterrupted and there is only one spot on the back. for those who have the same setup as I do where did you lines go?

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    Forum User verified Feedback Score 6 (100%) MADMarc's Avatar
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    Sounds like you're running to both of them from the rear nipple? I ran my ebc from there and teed off from the nipple on the front of the manifold neck just passed the throttle body. One side of the tee goes to the bpv and the other side goes to the AFPR. I have an AEM afpr and it is mounted on the rail though so you will have to run a longer line or splice it from elsewhere if you want to keep the ebc on its own. Yours on the firewall?
    60% of the time, my car works every time.

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    Member Not Verified Feedback Score 7 (100%) mb3000's Avatar
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    Boost controller should be run from the nipple on the y pipe or an equal pre-throttle body source, you have the afpr connected correctly. The bov should be connected to the larger nipple on the front side of the plenum.

    You don't have to run your lines this way, but it is logical.

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    Forum User Feedback Score 0 b3kgt's Avatar
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    yes both my boost controller and afpr are mounted on the firewall. madmarc so your afpr is sharing the same vacuum line as the bov? I drove around with the boost controller and afpr on the same line and it didnt seem to cause a problem but im sure they printed the warning for a reason

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    IIRC I have the FPR and factory boost solenoid both connected to the rear nipple. BOV to the front nipple. Have no issues...... Can't recall how it was from stock though......

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    Forum User verified Feedback Score 6 (100%) MADMarc's Avatar
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    You're making me want to double check, hahah. But yes, I am pretty sure I ran it that way...I know I did it for a reason but dammit I don't remember why any more.

    EDIT: FOUND IT! This is from the vac reduction walkthrough on the other forum.

    "...the cleanest method of connecting the FPR to a pressure/vacuum source is to use a plastic T: Plenum port-T-FPR. Not only can you get a plastic T with differently-sized ports to solve the nipple size problem, but you can also then run a vacuum line from that T to the BOV, which also requires a vacuum/pressure source to operate properly."

    I should have specified that the EBC needs to be connected to the nipple on the y-pipe, not the intake manifold. Just like he said, it should be pre throttle body. And since your fpr is on the firewall I'd just recommend leaving the vacuum line for the fpr where it is and then running a vac line to the ebc from that nipple. Have you done the vacuum reduction? I should have asked that first, lol, sorry.
    Last edited by MADMarc; 05-24-2011 at 09:19 PM.

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    MMM HMM
    boost controller pre throttle body, cause it does not need to see vacuum.
    fuel pressure post throttle body cause it needs vacuum.

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    Edit on mine above. I wasn't thinking straight at the time. I have my MAP sensor and FPR on the same line. Boost solonoid is still in the stock location. Sorry.

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    SKADOOSH!!! verified Feedback Score 1 (100%) J_Parker's Avatar
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    I have mine set up (Vac reduction) with my boost controller on the front nipple on the throttle body, AFPR on the back nipple of the plenum, and BOV on the front side of the plenum. I ran like that for a long time with no problems.
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