Blown06

iTrader: (32)

Heres the current setup:
346/D1sc
54375 impeller speed at shift point (about 87% of max)
creeps up to 15 psi at shift point (just barely hits 15)

If I change to a pulley combo to max out the D1 at 62000 impeller speed, how much boost should I expect to gain?

I have no idea what kind of rwhp it makes right now, but it traps 126 mph in a 4550 lb. truck. I'm guessing somewhere between 600 and 650 rwhp. Do y'all think it would be possible to hit 130 mph or more with this pulley change?

Other details in sig.

Rickys S/C Z28

iTrader: (13)

i dont know but im doing the same thing this year right now im running a 7.25 crank and a 3.7 headunit but im going with a 3.4 headunit this year that SHOULD be max rpm and im hoping to see some were around 17-18 psi but but i would rather see 700RWHP i dont care about boost numbers LOL

blue00ZZleeper

iTrader: (5)

No it wont be maxed out. 7.65 w/ 3.4 blower at 6700ish rpm is max. Always remeber you can go up in crank pully to make more boost and retain decent belt wrap.

Blown06

iTrader: (32)

My current pulley combo is 7.4" crank, 3.85" blower shifting at 6900 (6-rib).
My new pulley combo is 8" crank, 3.65" blower shifting at 6900 (8-rib).

Rickys S/C Z28

iTrader: (13)

im not sure on how to do the math but from what i have seen a 7.25 crank and a 3.40 head unit spinning to 6800 should be 64k right?

I_Need_Land

iTrader: (12)

7.65/3.4 @ 6800 = max

AFASTYZFR1

iTrader: (55)

7.25/ 3.4 @ 6800 = 59450

max is 62000 on a D1SC and 65000 on P1SC, its close


Pm me your email and I can send you the calculator, or you can find it on the forum.

Rickys S/C Z28

iTrader: (13)

thanks man!!

viper9403

iTrader: (14)

Should make around 18#, blower will eventually run out of cfm.

thevho

whats the smallest pulley u can go on the D1 ...?? and were do you get them at..?? what about the crank...??

Blown06

iTrader: (32)

Pulley size isn't really the question you should be asking as you could in theory put any pulley you want on it. Procharger doesn't recommend spinning this blower too far past 62000 rpm. So if you looking for max power you need a pulley combo for your given shift points or max rpm to achieve this impeller speed.

Use this equation to help you out.

(Crank Pulley Dia. x Max RPM x Blower Step Up Ratio)/Blower Pulley Dia.= Impeller RPM

For example a typical maxed out F-body setup would be
Crank Pulley: 7.65"
Blower Pulley: 3.4"
D1sc Step Up: 4.1
Max RPM: 6800

7.65 x 6800 = 52020
52020 x 4.1 = 213282
213282 / 3.4 = 62730 rpm impeller speed

lablackbeast

iTrader: (5)

what set up would yal run so it wont be maxxed out....??