If you check out the results of the cam comparison, even the mildest of Comp's Xtreme Energy lineup for the 4.6L Three-Valve motors offered some pretty hefty power gains. Often as not, cam changes that improve the power output by as much as 20 hp come with a loss in low-rpm torque production. Not so with this mild cam combo for the Three-Valve motor. The Comp Xtreme Energy grinds improved the power output from 4,000 rpm to 6,000 rpm and never lost any power down low. The power gains may well have been even more impressive if we had the ability to control the variable cam timing.
With no loss and plenty of extra power, even these small Comp cams would be a welcome addition to any '05-up Mustang motor. Now all we have to do is get the rest of the cams ordered so we can bring you Part 2 of the not-so-mega-modular cam test.
The test motor was assembled, complete, and ready to run- ditto for the Fast fuel injection and even the new Bassani exhaust.
What could be better than all the power without the obnoxious noise levels?
After ensuring the power numbers...
After ensuring the power numbers repeated perfectly, we removed the valve covers, front cover, and eventually the stock cams.
The factory cam sprockets...
The factory cam sprockets were essentially locked in a fixed position. We're looking into building a dedicated wiring harness to run the factory management system on the engine dyno to allow us to adjust the cam timing on these Three-Valve motors during the testing.
Replacing the stock cams with...
Replacing the stock cams with the Comp XE253H grinds improved the peak power numbers to 397 hp and 412 lb-ft of torque. These small Xtreme Energy cams were worth as much as 20 hp at 5,300 rpm.