Am I wrong for going with a 3.90 pulley for my F1A?
#1
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Just needed to know what you guys thought about me going with a 3.90 pulley. How much boost will I be seeing with this pulley and am I in danger of lifting heads? I just bought my F1A and the first thing that came to my mind was lets go with the smallest pulley. This will be a street/strip car so will this be ok? I believe the smallest pully I can go with is a 3.70 (not sure), anyway I've got 80 lbs injectors and want to know what everyone thinks of my impulsive behavior!?
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#2
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Why would you want to START with the SMALLEST? The smaller the pulley, the greater the chances of belt slip. Why not start with the correct size for your application?
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It will depend on how efficient your engine is as to what boost it makes. Ive seen people use a 3.7 pulley and make 22psi on a 370 and Im running a 3.7 and 18psi is the most I can get out of it. but to answer your question if you dont have a good tuner close by then a 3.90 will probably not be the best choice. My car was a real pain to tune and if I didnt have Heintz Racing just down the street then I would have never been able to have the power that I have and it still be streetable. jeff