Holy crap that's interesting! Here are some excerpts from their website:

...15% more air ACROSS THE ENTIRE RPM BAND...

...your 1200 and 1220 Paxton can produce almost the same 1200 CFM as a 1500 model...

http://www.928motorsports.com/parts/paxton_impeller.php

Dyno that thing already and tell us if it's true!

 

Is there a price diff btw the 1220 and the 1200?

 

The 1200 is significantly more efficient then the 1220 above 6 psi.

 

hmm very interesting, my 1200 should be here soon, if you have good results, I may ship mine out for a new impeller before it goes on the car. In for updates.

 

This is definitely going on my mod list if it works as advertised... I'm starting to wonder if I should even install the smaller pulley I just bought.

@RedCelica, I don't think there is a price difference when you order a kit from SOS. 1200/1220 are the same compressor housing, just a different impeller if I understand correctly. So it's just a question of which is more properly sized for the boost level you're planning to run.

 

I am supposed to install it on Saturday. Talked to the owner at 928 and he said these things were super easy to install. Just have to take the volute off, the nut holding the impellar, and istall the new one. The directions call for a. 006 clearance or more between the impellar and housing. They provide shims to get the clearance right.

Sent from my DROIDX using Tapatalk

 

Keep us posted...

I went back and read their product info again and found this:

In-car and on-bench testing has shown that our impeller moves about 20% more air at the same RPM as the original one, and at about 20% greater PSI.
Isn't that essentially the same result you'd get from using a smaller pulley? Is this intended to be a solution for people who've already maxed out their blower rpm, since the 928 motorsports impeller can spin higher than the original impeller?

 

seems like it's greater flow per rpm than the original 1200/1220 impeller, so you should make more power per psi.

 

just remember the impeller can spin to 60K but the bearings cant!!! I went with this impeller on my SOS 1200 550whp build.

 

I will not be spinning the bearings over the 53000 limit. I currently have a 3.2 inch pulley which spins the blower to 50422 rpms according to paxton's formula. With the smaller 3inch pulley and stock impellar I would be overspinning the blower by 700rpms.