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what am i doing wrong with my GT . why won't it go!!

2217 Views 11 Replies 8 Participants Last post by  RedRunner
Hey everyone I need some help from the guru's out there. Here is the situation. I have this 2005 Mustang Gt. I put a C&l cold air intake and A Diablosport tune. After perfecting my times at the track i got the car to run 13.59 in the 1/4 with a reaction time of .052 top speed of 102.65 now in the last week i went and put on the Steeda underdrive pullies, Put a set of Magnaflow exhaust and Reflashed the car with the Diablosport 93 C&L tune and ran 93 octane in the car my best time has been 13.572 with a reaction time of .047 at a top speed of 104.50 . Now i have been at it and cannot believe that with the pullies,tune and the exhaust the car did not get better. what did i do wrong? any suggestions. or maybe i have something else that i need to do. I am going to put the Zex nitrous kit on but for now i need to get the car right. can anyone help . Thanks in advance. :doh:
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The C& L tune is a generic tune.

After you tune it withe the c * L tune, you need to have it on a dyno to get the correct a/f ratio...I am guessing you are running way to lean.

don't use any of that octane boost junk either. that stuf really doesn't bind to the gasoline and will just waste your will clean the system though.

Are you an auto or stick?

auto's have 3:31 gears while the sticks have the 3:55's

next mod should be switching to 4:10's then the 1/4 mile times will come down.

I was not too impressed with the tune, though it did take my car form a constant 14.1 down do a contant 13.8

pullies will help your top end speed and your reaction times are great, but do not effect your overal 1/4 time.
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cheapest I've seen 4:10's 179.00

any speed shop should be able to swap aout the gears for 200 bones.
then use your diablosport predator to recalibrate the spedometer.
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