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Thread: Quick question

  1. #1
    SCH Member
    Join Date
    Jan 2009
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    Quick question

    I got my fmu and my msd box on today and drove it a little. I didn't get on it hard as I want to take it to the dyno first to check air fuel ratio's. (I won coupons for three free pulls) My question is that when I'm accelerating slowly my vacuum reading increase's from 12 to around 20. Even though I hear the turbo whistleing quite loud. If I get on it a little the vaccum goes down and starts to come up on the boost side. The most I saw today was around 3lbs. There again I didn't get on it really. I guess that just figured that the vacuum reading would go down while driving instead of up first. Later Kris

    The whining that I'm hearing is coming from the intake not the supercharger. Normal? I have the gt40 tubular intake.

  2. #2
    SCH Moderator "SN Guru" speedytang's Avatar
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    Dec 2002
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    Marengo, Ohio
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    Sounds like you have a vacuum leak or a leak from the supercharger to the intake. If your on the pedal at all, not even under boost you should never see the vacuum increase unless you let of the throttle a little.

  3. #3
    SCH Member
    Join Date
    Jan 2009
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    54
    I got me a handheld propane torch last week. I'll give that a try. Kris

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