How much increase in boost?

[NERD]

My buddies got a PI vortech car that was making 10lbs with an S-trim and he upgraded to a T-trim, got a Power Pipe and upgraded to a 10% overdrive crank. Our question is, How much boost will his boost go up?

We've heard a few different thing.

Since the CFM of the S/C is increasing by 200cfm, wouldn't that increase boost? So the by that logic boost would have to increase. 1000 CFM vs 1200 CFM

I would give +3-4lbs for the 10% overdrive crank pulley and 2-3 for the boost pipe.


Any thoughts? Experience preferred please anyone can guess.

He's worried about lifting the heads from too much boost.

 

[NERD]

Anyone?

 

[stang94X]

there no real answer until you get a boost gauge hooked up, its the only way to know for sure

 

[Paul]

Boost is a measure of restriction, not volume. It would be difficult (IMHO) to predict the increase in boost. If he's concerned about popping a head gasket, then perhaps he should start with a larger blower pulley or smaller crank pulley.

Any commentary provided here would likely be just blind guessing, and not value-added.

Paul.

 

[Dalamar]

another factor is that the intake and heads will only flow so much air.

With the T trim, it may come on sooner, and give you some more air up top.
hard to guesstimate, and there's more to it thank peak pressure, like paul said.

 

[NERD]

So far, he's had it to 4200 and his boost what already at 12lbs. As long as there's no/minimal belt slip he should see every bit of 18-20lbs. He was just worried that if the boost was too much he'd lift the head.