Why the Fox Conversions?

Killer,
I'm seeing the boost gains down-low up top I'm yet to see...but going from 2 1/4 to 3" is going to increase flow, and let that supercharger breathe much better. I hear what you are saying about the more flow=less boost, but this kit helped me p/u 2psi right off the bat in the lower rpms.

Paul,

I was thinking the same thing, but then I was also wondering why is it when you install a powerpipe you pick up boost. That has to be freeing up more air than the stock s/c set up ?

onebad95 said:

Paul,

I was thinking the same thing, but then I was also wondering why is it when you install a powerpipe you pick up boost. That has to be freeing up more air than the stock s/c set up ?

Click to expand...

You pick up boost with a powerpipe because with it you decrease the restriction IN FRONT of the blower. Anytime you do this you make it more efficient and it is able to pull more air in per revolution of the blower, so more air is pushed out of it and therefore boost goes up. It goes back to the statement I made above about the KB blower. On a KB, the MAF, TB, inlet tube, etc are all in front of the blower itself. So on a KB, you will see an increase in boost with a powerpipe (a NA one), AND you will see an increase in boost with a bigger MAF and TB. The less of a restriction you have BEFORE, NOT AFTER the blower the more air it can push per revolution. In theory if you add a bigger MAF and TB to a centrifical SC, which are AFTER the blower, you will see a boost DECREASE because as I said, boost is nothing more than a measurement of backpressure in the area AFTER the SC compresses it. So... going back to what I said above, if the fox inlet flows more and is less of a restriction, you should see a DECREASE in boost, not the other way around.


Just remember, boost doesn't equal airflow, its a measurement of the backpressure in the intake track.

Def. makes sense, and I'm with you...when I ported my heads I lost boost...same principle.
Mainly the gains I'm seeing is where before at like 3k I'd only have 3-4psi, now I'm seeing 6psi really quick...It was a very obvious change.

I'm gonna be switching to a fox body set up myself this winter. Picked up a system II intake for $300. Gonna hit up the local speed shop for as many stock parts as I can and then go from there. I'm basically doing it becuase i wanna run a blow-through mass air and the fox setup will allow me more room.