Justin@VMP
July 17th, 2007, 12:30 PM
Keith has a 2006 4.0L Manual Mustang. He still has single exhaust with the Ford Racing muffler. He bolted on a procharger kit and has two pulleys for it. The "9psi" pulley actually makes 11psi at 6200rpm. The "12psi" pulley makes 13psi at 6200rpm. All runs were done in 4th gear. The fuel pump is stock, the injectors are 39/42lb 03/04 cobra pieces, and the maf is stock with a mafia on setting 2, an extender is required to keep it from pegging in blow through. Keith's car has TR6 plugs, based on the 3rd run it seems there is a little spark instability on the top end. On the way back to GA he logged 27mpg. I consider fuel mileage and driveability to be a very important part of the tune.
His 12/13psi run pretty much overlays exactly with Rebecca's aftercooled Vortech at 13psi. The procharger makes 1/2 lb more boost under the curve and the same peak boost. The power curves lay on top of each other except for the very end where Rebecca's car pulls to 351rwhp, for whatever reason it made a few more up top, possibly due to better spark.
Keith with A/F:
http://www.vmptuning.com/dynographs/keithatiaf.jpg
Keith with boost:
http://www.vmptuning.com/dynographs/keithatiboost.jpg
Rebecca 13psi aftercooled vortech:
http://www.vmptuning.com/06/7psiVS13psi.jpg
His 12/13psi run pretty much overlays exactly with Rebecca's aftercooled Vortech at 13psi. The procharger makes 1/2 lb more boost under the curve and the same peak boost. The power curves lay on top of each other except for the very end where Rebecca's car pulls to 351rwhp, for whatever reason it made a few more up top, possibly due to better spark.
Keith with A/F:
http://www.vmptuning.com/dynographs/keithatiaf.jpg
Keith with boost:
http://www.vmptuning.com/dynographs/keithatiboost.jpg
Rebecca 13psi aftercooled vortech:
http://www.vmptuning.com/06/7psiVS13psi.jpg