whipple and a 6LB lower what PSI

[porsches4lunch]

I am looking to get a Whipple and already have a 6 LB lower pulley. How much PSI should i see with this combination? Should i back off to a 4 LB pulley? or should i just put the stock one back on and change the pulley on the Whipple?

 

[Mach2]

I have a stroker motor so I lose about 4lbs of boost over stock motors but I run a 6lb lower with 3.25 upper and see about 18 pounds for a street tune for the track I switch in the 8lb lower and race gas. But with a stock engine with a 6lb and stock whipple pulley you will see about 19 psi.

 

[BlackSabbath]

That combo is rated for 19psi but don't be surprised if you see 20-20.5 with good air and a 12" CAI.

 

[ETW]

I'm running a 3.5 upper and 6lb lower, and have been told that makes 19psi. Is this right?

 

[EJ23]

I have a 6lb lower and 3.25 upper and see about 20-21psi. Does this sound right with my exhaust??

 

[porsches4lunch]

Well, if the Stock lower pulley with the stock Whipple pulley generates 13 PSI then i gues it would stand to reason that a 6LB lower would add 6 PSI for a total of 19 PSI. This may be a little lower once i slap on the long tubes and off road X pipe.