The 3-valve 4.6-liter V8 Mustangs may soon be overshadowed by the brilliant new 5.0-liter 2011 Mustang GT’s. That doesn’t have to mean being slower than their new brethren! With the new Stangs starting at over $30,000, the former 2005-2009 Mustangs can be bought and outfitted nicely for less cash.
One tried and true way to increase performance, especially with non-stock engines is with cam phasers, which adjust the cam timing so the intake valve closes sooner at lower rpm and later at higher rpm. Timing is normally retarded about 10 degrees when measured in crankshaft rotation at full throttle, but at part throttle Ford calibration can retard timing as much as 60 degrees for better fuel mileage and reduced emissions.
Anytime you advance the cam, the intake valves get closer to the pistons, and anytime you retard the cam, the exhaust valves get closer. If precautions aren’t taken, then an aggressive cam could smash and burn all the valves into the pistons.
Along comes Comp, whose phaser-limiter kit allows the cams to be retarded a max of 10 degrees so you can slap in healthier cams for more power. With the limiter and new cams, you can get 25-30 additional horsepower at the rear wheels.
By also swapping out the valvesprings you can get 48-hp added at the rear wheels. You can get even more power by tweaking the cam timing curves in the computer. The cost of just the limiter is $185.75 from Summit Racing.