07gt with boost issue

Discussion in '2007 - 2014 Shelby GT500 Tech' started by 89hatchlx, Jun 7, 2009.


  1. 89hatchlx

    89hatchlx New Member

    Joined:
    Oct 9, 2008
    Messages:
    59
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Dirty South Jerzzzz
    :( Just picked up a 07 GT five speed with a Saleen Stage 1 blower. That was put on by JDM Engineering in Jersey. Day one boost hit 8 psi no problem held steady untill you let off the gas day two hardly wants to hit 4 psi and the boost gauge flutters like a butterfly. Car still seems to be running great but it just weird i know it should hold steady... Anyone have and ideas or info on what i can do to fix or check? All help is greatly appreciated... Thanks
  2. lx93notch

    lx93notch New Member

    Joined:
    Oct 10, 2007
    Messages:
    24
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    coventry, rhode island
    it could be possible that you have some belt slippage goin on there, thad be the first thing to check along with the tensioner
  3. stangzilla100

    stangzilla100 New Member

    Joined:
    Oct 20, 2008
    Messages:
    106
    Likes Received:
    0
    Trophy Points:
    0
    belt slip is probly the culprit. hows the a/f and the fuel pressure?
  4. whitegt500

    whitegt500 New Member

    Joined:
    Jun 18, 2009
    Messages:
    15
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    san angelo TX
    another problem may be if they didnt upgrade the spark plugs and may be blowin out the spark under hard acceleration, i have my plugs gapped at .30 and anything over .35 maybe causing that
  5. My06Stang

    My06Stang New Member

    Joined:
    Sep 3, 2005
    Messages:
    15
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Florida
    You should pull the plugs and make sure they are the colder HT0 not the stock motorcrafts. the other thing would be to check the color of the injectors they should be BLUE at least. those are generally the cobra injectors so it makes sure you have pleanty of fuel.

    Belt slip could be the issue also just a loose boost line if it is not electrical. the saleens use a sender for that stuff so it could be bad.


    you should have a shop check it out.

Share This Page