2005 Ford Mustang GT Upgrades Kenne Bell Supercharger Kit
Effect of Ignition Timing--Kenne Bell Supercharged 4.6 Three-Valve
This graph illustrates the effect of changes in the total ignition timing on the supercharged Three-Valve 4.6. The six power (and torque) curves represent the power achieved running 15, 17, 19, 21, 23, and 25 degrees of total timing. Naturally, this timing curve was run with race fuel, as the supercharged motor will not tolerate 25 degrees of total timing on 91-octane (California) pump gas. You can see that each successive 2 degrees of additional timing improved the power output by 6-8 hp. The final step from 23 to 25 degrees showed less of a gain, where the jump from 19 to 21 degrees showed the greatest. Tests like this can only be run if you have complete control of the engine-management system. Using SCT software, the gang at Kenne Bell was able to eliminate coolant and air temp variables and precisely dial in the air/fuel curve. This way, the only changes were the described 2-degree changes in total timing. View Related Article
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