tispco Posted August 27, 2009 Report Share Posted August 27, 2009 The Whipple supercharger upgrade has been popular for the SGT's, so I wanted to post my experience here to hopefully save another member a lot of frustration. I installed a Whipple 400hp kit on my GT vert five months ago and I have been trying to resolve a knock / rattle issue in the motor ever since. It has been VERY frustrating, but I finally figured it out tonight! :happy feet: My vert has been to the install shop numerous times, I spoke with Ford Racing and Whipple several times. Whipple even rebuilt the supercharger and my vert sat undriveable for a five weeks while I waited on the rebuild. The problem persisted and no one could figure it out. In the end, it turned out to be a simple fix. My throttle body rattles. I swapped the throttle body from my GT-H with my vert and the rattle/knock is gone! It was very unnerving because the noise sounded exactly like engine knock to everyone that heard it, so I was worried I was going to blow the motor. The issue I had was a noise that sounds just like engine knock that is constant between 2000 – 2500 RPMs under WOT with at least 4psi of boost in any gear. All three conditions (RPMs, WOT, 4+ psi) must be there or it will not make the noise. Also, if you let off the gas in that RPM range, the noise gets louder for a second and then stops. If you have this problem after a Whipple install, check your throttle body!! Also, prior to the Whipple install, I never heard this noise. I hope this saves someone a huge headache in the future. If anyone has a GT throttle body they want to get rid of cheap, I could use one! Link to comment Share on other sites More sharing options...
gbstang Posted August 27, 2009 Report Share Posted August 27, 2009 Good info for sure! I know the E-force was having a simliar issue, but the symptom was a surging in the rpms.. My experience has only been the alternator.. I knew a bunch of racers, they have always said, the higher the horsepower, the more frequent the repairs.. GNB Link to comment Share on other sites More sharing options...
Chill Posted August 27, 2009 Report Share Posted August 27, 2009 Glad you figured it out tispco. I know I'd sleep better with the knock noise gone! Link to comment Share on other sites More sharing options...
JeffIsHereToo Posted August 27, 2009 Report Share Posted August 27, 2009 http://www.newtakeoff.com/mustang_gt_throt...cludes_tps.aspx $179.99 Link to comment Share on other sites More sharing options...
ShowCar Posted August 27, 2009 Report Share Posted August 27, 2009 Good thing it was the TB and nothing else. How she run otherwise? Link to comment Share on other sites More sharing options...
tispco Posted August 28, 2009 Author Report Share Posted August 28, 2009 Good thing it was the TB and nothing else. How she run otherwise? It is running great. The throttle body problem was VERY annoying, but otherwise I am very happy with the upgrade and additional power. Link to comment Share on other sites More sharing options...
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