MustangWorks.com : Ford Forums - View Single Post

red82gt · 01-20-2003, 11:33 PM

The road demon will have a leaner calibration than the speed demon for normal driving. The speed demon can also be had with mechanical secondaries. If you want more performance-speed demon, if you want more driveability-road demon. The main difference is that the road demon has smaller main jets and larger power valve passages so that it is leaner at cruise and part throttle and then the extra fuel under load comes from the power valve. The speed demon has larger main jets and smaller power valve passages so it gets less of its fuel from the power valve and more from the main jets.
Why are you getting rid of the Holley 650 DP?

01-20-2003, 11:33 PM	#2
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	The road demon will have a leaner calibration than the speed demon for normal driving. The speed demon can also be had with mechanical secondaries. If you want more performance-speed demon, if you want more driveability-road demon. The main difference is that the road demon has smaller main jets and larger power valve passages so that it is leaner at cruise and part throttle and then the extra fuel under load comes from the power valve. The speed demon has larger main jets and smaller power valve passages so it gets less of its fuel from the power valve and more from the main jets. Why are you getting rid of the Holley 650 DP? __________________ 393W: AFR 205's, hydraulic roller, TKO600.