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  • vac/boost lines

    I am to the point of hooking in the vac/boost lines for the BOV, wastegate, gauge, and FMU. There is no fitting on the turbo itself, and I do not have a boost regular.

    Can I hook all of these to the same vacuum source? There is a line at the top of the 3.4 I think I can T off. (I think it's 1/8". FPR and MAP hose?)

    I am confused by the fitting sizes. The tubing for the Autometer gauge is very small. It claims to be 1/8", but there is no way I get that on to a 1/8" barb for the T. What size is this?

    The FMU as an SAE #4 fitting (1/4"?), and the BOV and WG have a 1/4. Should I run 1/4" tubing all the way from the T off the vac line or should I run 1/8 tubing and convert at the fitting? I am confused because wouldn't the pressure change when the diameter of the tube changes?

    Or should I run the gauge off the 1/8" line (how the hell do I hook that in?) and find a 1/4" line for the others? Is there another source in the 3.4 to tap into like the PCV hose?

    Thanks for the help!
    Last edited by SpeedingFirebird; 02-20-2010, 10:57 PM.


    http://www.cardomain.com/memberpage/799659

  • #2
    Re: vac/boost lines

    Off that T fitting is fine, I hooked up my vacuum gauge there and it isnt a problem also shraeder valve is right behind that t fitting.

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    • #3
      Re: vac/boost lines

      Originally posted by Slowside View Post
      Off that T fitting is fine, I hooked up my vacuum gauge there and it isnt a problem also shraeder valve is right behind that t fitting.
      Where do I change the hose size though? Right at that 6-way T?


      http://www.cardomain.com/memberpage/799659

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      • #4
        Re: vac/boost lines

        That would be fine really doesn't matter except just keep it looking clean. I plan going off my TB into a 5 way splitter and just mounting the splitter zip tied to the top of the TB.
        08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
        96' Camaro M5 to A4 conversion, alot of mods . GT35R Turbo full suspension. Built engine

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        • #5
          Re: vac/boost lines

          6 way? Off the top of that valve is a T, I hooked up a male T fitting to that between it and the hose. And I pull 20 inches of mercury at idle

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          • #6
            Re: vac/boost lines

            Originally posted by Slowside View Post
            6 way? Off the top of that valve is a T, I hooked up a male T fitting to that between it and the hose. And I pull 20 inches of mercury at idle
            6 -way: in, FPR (out), boost gauge, BOV, WG, and FMU.


            http://www.cardomain.com/memberpage/799659

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