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Vacuum under WOT?

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  • #1

    Vacuum under WOT?

    Trying to iron out the bugs and we noticed that during my passes at 100% throttle I am the MAP sensor is showing 91 kPa (should be very close to 100).

    I am guessing a lot of this can be attributed to the homemade 3in. pvc intake pipe I built for it so I am going to replace it with a 4 inch aluminum pipe.

    Any other reasons that you would show vacuum during WOT? How much h/p would this eat up?
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  • #2
    A lot. I would suspect the sensor first, check it with a vacuum gauge though.

    Vacuum at WOT indicates an intake restriction of some sort and usually it has to be pretty serious to even register on a gauge. If any part of your intake tubing is collapsible that would be the suspect part. Or your throttle body may not be opening all the way.

    Then again, if you got a 3 inch inlet that is only about 76mm, that isn't really enough for shit if you ask me.
    Originally posted by racrguy
    What's your beef with NPR, because their listeners are typically more informed than others?
    Originally posted by racrguy
    Voting is a constitutional right, overthrowing the government isn't.

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    • #3
      Originally posted by Broncojohnny View Post
      A lot. I would suspect the sensor first, check it with a vacuum gauge though.

      Vacuum at WOT indicates an intake restriction of some sort and usually it has to be pretty serious to even register on a gauge. If any part of your intake tubing is collapsible that would be the suspect part. Or your throttle body may not be opening all the way.

      Then again, if you got a 3 inch inlet that is only about 76mm, that isn't really enough for shit if you ask me.
      Ya, and the pipe makes a 90* turn and I am not 100% sure if it even maintains the 3in i.d. through that turn. I am running a 4 inch filter at the end of the pipe.

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      • #4
        Originally posted by dville_gt View Post
        Ya, and the pipe makes a 90* turn and I am not 100% sure if it even maintains the 3in i.d. through that turn. I am running a 4 inch filter at the end of the pipe.
        I went and looked at your pics in the pic forum. If you aren't running mass air then just take that whole elbow off and see if that solves the issue.
        Originally posted by racrguy
        What's your beef with NPR, because their listeners are typically more informed than others?
        Originally posted by racrguy
        Voting is a constitutional right, overthrowing the government isn't.

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        • #5
          I am running a MAF. I don't think any of the pictures on this forum show the PVC intake.

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          • #6
            Originally posted by dville_gt View Post
            I am running a MAF. I don't think any of the pictures on this forum show the PVC intake.
            do you still have that cowl hood on there? if so would there be room to fun an fbody style MAF and Filter set-up? just thinking out loud here...

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