RRR

Planning on running a p600b w/ fmic with a 15# pulley and maybe a 23% underdrive pulley. Planning on running a much bigger k&n filter as well.

How much boost can I expect from this setup and horsepower/torque?
anyone with a similar setup to compare dyno numbers or people that ran/run the 15# pulley how much boost shows on the guage-mods?
My car has the black bowtie in the bumper cut out so the fmic is visable.
How much boost will the 23% underdrive pulley add? the filter?

Engine will consist of: (93 octane with toulene added CAM tuning later)

50# injectors
dual intank walbro 255s
studded 2 bolt main
forged crank
forged rods
forged dished pistons
arp bolts
stock heads
stock cam
1.6 roller rockers
long tubes (might run mac mids for a while though)
4l60e with a s10 converter and oil cooler
stock 10 bolt

Ponyhntr

Well, if it's a 15# pulley, I would think it makes 15 psi. ATI doesn't rate their pulley's in #'s, just for that reason. A 2.55" 12 rib pulley may make 15 psi on a stock engine with a P600B, but not on a 383. On an engine like yours I would expect between 10 and 12 psi.

Also, a underdrive pulley on a LT1 F-body will not effect boost, because the blower is driven by it's own crank pulley. An underdrive pulley on a car like a LT1 Corvette will actually make LESS boost, as it would slow the blower down.

I would imagine that you should expect about 500-525 to the wheels, but that's just a guess.

CALL911

I've never seen a P600 make anything more than 11#'s of boost, so guessing that you make that, my estimate on your RWHP will be around 465 or so with your setup.

If you would change up the heads and cam, I would guess maybe another 75+ extra RWHP though.

RRR

Yeah, it seems that no one makes 15# with what is referred to as the 15# pulley. I heard one guy mad 12# but I think he said boost decreased when he did heads and exhaust so I don't know if he was making 14-15# before that. Anyone else care to comment on the 15# pulley?

Ponyhntr

What more are you looking for?

JWS6

Mods in sig, stock ATI inlet collapsing, the car saw 10.5# boost, 498RWHP. This was wit the 2.55" pulley(15#'s)

rskrause

A quick way to estimate max boost. Courtesy of yours truly.

http://www.kennedysdynotune.com/Blower%20CFM.htm

You can use the formula with a compressor map to estimate boost at less than max impeller rpm.