any body running a 6 rib 3.1 blower pulley with the factory crank pully from ati
if so how much boost you making?

 

Here's a bump for you. I'm curious too as to what people are seeing with this combination, but... See the info below.

How much boost the blower can produce depends on many variables.
* Cubic inch. The larger the engine the less boost it will make with a supercharger.
* Headers and exhaust. A better flowing system will produce less boost, requires a smaller pulley to regain the loss in boost. Ultimately though, more power will be gained.
* Camshaft and heads. A camshaft with some overlap will leak out some boost through the valves. Better flowing heads react a lot like a better flowing exhaust system.
* Altitude. Elevation plays a big part in how much boost is produced. Those people living in the higher elevations have to spin the blower harder to see boost.
* Condition of engine. An engine with real good sealing rings will ultimately produce more boost than one with worn rings.
* Rpm. An engine that is spun up higher in the rpm range will normally produce more boost.

Bob

 

thanks bob i have several deferint pulleys with this and just want to see what would be the best set up
i have just about got this ready to go on
hopefully in a couple more weeks i can give you a call and get the rest of my stuff i need

 

another bump, im curious as well

 

When I first installed my P1SC kit I had a stock crank pulley on it and a 3.20 blower pulley was good for 8 psi, but it slipped really bad. About that time the MMS stuff was big. So after seeing a the dust build up everywhere I went with the MMS set-up and bigger pulley in 2003.

 

I think you would be slipping at that point, on a 6 rib

 

I would expect 9lbs. But a regular procharger pulley would probably slip. Maybe if you have it coated or a reichard racing pulley.

I'm attempting to get my 6-Rib to work as I just don't have the added fun money to invest in the SDCE setup.

 

The SDCE is worth the initial investment. When you add up the cost of belts and pulleys to try and make the 6 rib work comes to under the price but to make good boost hassle free it is worth IMO. I still am running the MMS crank pulley with a 3.5" RR pulley. I am waiting until I upgrade to a F1A then I will do the SDCE.

 

So I should forget about running 9-10psi on my 6 rib P1 setup?
It sounds like 7-8 is about the most you want to try and run on a 6 rib P1 setup.. true?

 

I up to 12psi with mms crank pulley and 3.2 supercharger pulley, but i'm overspinning the p1sc 68,000, max is 62k i think.

 

where is everyone getting these MMS pulleys? Do they make them anymore?

 

Nope. Otherwise I would have probably grabbed one. However SDCE might have a comparable one.

 

The MMS crank pulley is 7.85" and the SDCE is 7.25"
You might as well buy the whole set-up though.