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Boost stays steady but power drops

Discussion in 'EFI Tuning Questions and Engine Management' started by blkhors, Oct 1, 2009.

  1. blkhors

    Joined:
    Dec 30, 2003
    Hey Guys

    Looking for suggestions.

    Dyno attached. So here's the probelm:

    Boost remains constant at ~13PSI however as soon as power builds it's starts to drop.
    It's a hellion kit with a GT40 turbo on a 04GT.
    stroked
    turbo cams

    plugged cat? downpipe restrictions?

    Thanks
     
    blkhors, Oct 1, 2009
    #1

  2. blown99

    Joined:
    Feb 11, 2008
    What size GT40? 82 or an 88. I run the gt4082 on my 2v pi motor and it definatly does not fall off like yours does. Mine pulls good to low 5krpm before I get valve float. I recently removed the free flow cat and that woke it up a lot. I also have a 3" downpipe split into two 2 1/2. 42lb inj, lmaf, tweecer for a tuner. What are your timing tables like? Who is tuning this for you? Any pics? Why did you stop at 13psi?
     
    blown99, Oct 1, 2009
    #2

  3. wildcardfox

    Joined:
    Aug 1, 2008
    What's your fuel system... I had a similar problem like this, and it turned out to be the fuel system that was starving the pumps once we hit a certain rpm...

    also what valve springs are you using? stock or beehive?
     
    wildcardfox, Oct 1, 2009
    #3

  4. 1crzhrs

    Joined:
    Sep 29, 2009
    what size springs you floating? what seat pressure?
     
    1crzhrs, Oct 1, 2009
    #4
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