Boost guage banging/fluttering

Discussion in '2011+ Mustang GT 5.0L Tech' started by OX1, Jun 12, 2019.

  1. OX1

    OX1 forum member

    Finally got a boost guage. Nothing special, 2-1/8 mechanical.

    I have it tied into the port that is on side of sensor that sends boost signal
    to Roush boost-a-pump.

    Getting into boost, guage needles bangs (flutters) like crazy.
    I assume it is reading the boost spikes from the blower rotors?

    Is there a better source and/or something to put in the vac line
    so it "normalizes" that vac/boost signal?
  2. 01yellerCobra

    01yellerCobra forum member

    It shouldn't bounce from any port. Think about if that's the signal going to the BAP. It would screw it up. The boost doesn't spike like that. It's pretty constant. I'd check your line and make sure you don't have any leaks.
  3. Sky Render

    Sky Render Stig's Retarded Cousin S197 Team Member

    Yeppers. Sounds like a boost leak.
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