so here is my thoughts. on my experimental powerdyne system. i dont notice much boost at all until higher rpms, rpms, as tequilaboy sez, that are so high they are dangerous to the blower itself. I still have to do dyno tuning.

So on my forged 383, with , lets assume a slightly lower than stock compression, with the new AFR 195 76 cm heads, and Snow system, (Accel DFI Gen VII Computer, 42 lb injectors, would it make more sense to go with a different blower that would produce boost at lower rpms range and go through 10 psi

or upgrade the powerdyne to the newer impeller etc. from 928motorsports?

 

Mark,

From what I've gathered, the powerdyne can flow about 860 cfm in stock form. This appears to be just enough flow to support about 6-7 lbs of boost in 350 cubic inch LT1 applications, when pullied to 36-40,000 rpm or more at 6,000 rpm. This seems to be the performance limit of the blower.

You have larger displacment and better heads than an LT1, so your engine demands more airflow. As a result the boost in your car will likely be lower by 15-20% (a guess on my part).

The impeller upgrade looks attractive, since it is advertised to provide 20% more flow and 20% more boost which should push the flow in the region of 1000 cfm. Effectively making the powerdyne a bigger blower. I'm hoping this is true, since it would give me a future upgrade option as well. I'm very curious if it delivers.

From the numbers thrown around, it would appear that with the impeller upgrade, you may be able to achieve similar boost levels as an pullied LT1, maybe getting back up to 6-7 psi. Pehaps even 8 psi depending upon pulleys etc.

If you want to achieve 10 psi or more, I would think a bigger blower would be necessary.

There may be another blower that shares a common mounting configuration with the powerdyne, so you may be able to use your existing bracket.

Vortech perhaps? I know I've seen some pictures that show a similar circular 7 hole mounting arrangement, but I'm not certain which blower it was.

 

Mark,

If you end up not using the 2.7" pulley, I might be interested.

It should work ok with my underdrive (roughly 6")crank pulley.

I haven't decided if I want to run my stock 7" crank and a 3.12" blower pulley, or use my smaller crank pulley with a 2.7" or keep it as is with the smaller crank pulley and 2.93".


I wouldn't be surprised if I end up buying both a 3.12" and 2.7" pulley in the future.

 

I was thinking the same thing. . . about the vortech. Im going to finish tuning this system in the spring, see where it is at. according to the boost gauge, im getting 6 lbs now, at high rpms. i am guessing that a vortech by design would not be so limited with the rpms, esp. after i added the higher rpm lt1 intake.

 

ill def. keep u in mind if it comes to that.