calculator for injector sizing on fords?

[aggie97]

Looking for crank hp vs. injector sizing.

Considering upgrading heads/cams this fall and need to see if my 30# injectors are going to cut it. Goal is 420 to 425 crank hp....

gracias.

[Sleeper]

Na I assume. 30's should be fine.

[91GriggsGT]

Here is some info from the ford racing website. According to their tech sheet, you would need something around 32lbs injectors with those hp goals to stay around the 85% duty cycle.

I kind of went over kill and dropped 42s in mine. Really did not need that big of injector, but it gives me room to go to a bigger motor when I want too and not have to drop money on injectors again.

http://www.fordracingparts.com/downl...ingEFIComp.pdf

[Stroked_gt]

http://www.eastcoastrollingthunder.com/jmiller/finject1.htm

[Justa4Banger]

http://www.rceng.com/technical.aspx?UserID=15834340&SessionID=9VstAIGeJrlp0HCjvta7

do your own math..

According to this site (which spot on IMO) you should be looking at 35#'s for 450 Crank hp...@ 80% duty cycle..

check it out.