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JasonSmith

09-18-2007 10:24 PM

Whipple pulley?

If my 3.118" pulley makes 7 lbs of boost on a 454, what will a 2.875" pulley make on the same motor?
Hp now is supposed to be 650ish. So hom much more with the added boost?

Young Performance

09-18-2007 10:37 PM

add 2-2.5 lbs or 9-9.5 lbs of boost. Should add between 50-75 hp, depending on a few variables. Eddie

QWKRN U

09-18-2007 11:31 PM

Turn it up....

JasonSmith

09-18-2007 11:37 PM

Quote:

Originally Posted by QWKRN U (Post 2276856)

Turn it up....

I got to! I got beat @ Perry. Besides, injectors & pullies were cheaper than new propellers. :D

Griff

09-18-2007 11:53 PM

Stocking up on the XR's too, I hope. LOL:D:D

JasonSmith

09-18-2007 11:55 PM

I've used 2 of my spare drives, but 2 were stolen, so......

zt260

09-19-2007 07:37 PM

Quote:

Originally Posted by JasonSmith (Post 2276811)

If my 3.118" pulley makes 7 lbs of boost on a 454, what will a 2.875" pulley make on the same motor?
Hp now is supposed to be 650ish. So hom much more with the added boost?

It would put you at 9psi+/- and into race fuel. (to be safe anyway) From my experience expect no more than 50Hp more. It could be less depending on your setup.

BTW, the reliabilty goes way down at this point.

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