09 GT500 556 rwhp

[BradyPPC]

A few months back we had the opportunity to work on yet another GT500 for a customer. When we received the car, it was already equipped with a Steeda 2.7 pulley, FRPP cold air kit, Bassani long tube headers, and full Bassani 3" exhaust. The car had a few minor problems the customer wanted worked out.

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/20100303093512_1_.jpg

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/20100303093423_1_.jpg

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/20100303093349_1_.jpg

 

The car was making decent power on the tune it came in, 537 rear wheel horsepower to be exact. The goal was to eliminate a nagging check engine light, quieten down the exhaust a tad, and we were asked to make sure everything else was in line as well.

 

Two 12" resonators were installed directly after the collectors to help calm the noise of the exhaust. With the installation of the resonators we were also able to eliminate two exhaust leaks that were affecting the front oxygen sensors. We then moved on to verify that the correct heat range spark plugs were installed and set to the proper gaps. In this case, stock plugs were reused in the original install and they were still set at the stock gap. The stock plug is way to hot for any additional boost and is a huge no no on these cars. We went ahead and put the correct plugs set at the correct gap in the car. To help eliminate belt slip we installed a Metco 90mm axillary idler pulley. The idler not only takes up belt slack from using the smaller pulley, but it also helps wrap the belt further under the smaller pulley, allowing for more pulley contact.

 

The smaller supercharger pulley before the installation of the auxillary tensioner.

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/DSC03157.jpg

 

You can see how much more contact the belt has with the supercharger pulley after the installation of the auxillary tensioner.

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/20100305175126_1_.jpg

 

Next it was time to move onto tuning. The first thing we did was ditch the previous tune and Istarted from scratch.Since power was good with the tune in the car, the plan was to improve driveability, eliminate the check engine light, and make sure the car was safe. The result was gains as high as 20 lb/ft tq in the lower rpm ranges and 19 horsepower up top and a very nice progressive pedal. Another added benefit is that @ 6200 rpm, where the original tune was falling off, the PPC tune is still on the rise. I probably could have pulled the car a little higher and saw more peak horsepower but for safety sake, I left the stock rev limiter @ 6250 rpm and did not feel the need to pull any higher.

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/555hpgraph.jpg

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/before_after.jpg

 

Here is the before and after graphs broke out every 50 rpm for comparison.

 

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/p1.jpg

http://i548.photobucket.com/albums/ii353/brady/Ford/Mustang/GT500/Tim%202009%20GT500/p2.jpg

Edited June 7, 2010 by Brady@PPC

[BradyPPC]

Video for anyone interested