Lower ICP will extend the burn time of the fuel and provide a little more push in low to mid RPM torque. Higher ICP will improve atomization and cause a faster burn, which at high RPM is great but may result in a loss of power at lower RPMs as the burn will completer faster than the piston can properly align to use it. What can often help when running higher ICP levels is to reduce timing a bit more so that the heat expansion occurs at the proper point for maximum effective pressure on the piston.
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Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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