MPI PowerGrip GT2 sprockets

[onrof]

I see some guys say they have a 24 tooth sprocket on their superchargers. The gates catalog only shows 22, 26, then 30 tooth sprockets. Anyone know where I can get my hands on a 24?

Also, what sheeve is used? model #? they all look so similiar and my local gates dealer is as confused as I.

I've been calling MPI but it's always busy or some mom with a crying infant answers and takes a message. She finally told me yesterday that Al was no longer with the company and mack would call me back.

 

[Srxspec]

Part number P24-8MGT-20

I get them from my local Gates distributor.

 

[onrof]

thanks, would you know which model # sheeve? is it different for top and bottom? I have the stage 2 MPI

 

[Srxspec]

By bushing are you asking which taper lock fits?

Pulleys with 22-28 teeth take taper lock part # 1108 (then specify shaft size, 7/8" for crank gear and 3/4" for supercharger gear in stage 1 units).

Pulleys with 30-32 teeth take taper lock part # 1210 (then specify shaft size, 7/8" for crank gear and 3/4" for supercharger gear in stage 1 units).

 

[onrof]

Thanks srxspec!

Could I ask a dumb question? I tear up the belts, tops of cogs get lobbed off, probably because of the small sprocket and high rpm. If I switched to say two 26's or two 30's would i still have the same boost as with two 22's.

 

[Srxspec]

If you look at your belt can you see if it's wearing more on the front side or backside of the teeth?

My thoughts are that you need to add a blow off valve to keep the boost pressure from feeding back against the supercharger impeller when closing the throttle plates. I would look at adding a Turbo XS Type S Blow Off Valve or the equivalent.

Yes any two gears with the same teeth would work assuming the belt is the correct length to run those gears. The Stage 1 Apex/RX-1 models use a 600mm length belt and can be used with up to 26/24 pulleys (26/22, 24/24, etc will fit with this belt) where as the Vector Stage 1 uses a 640mm length belt and uses 30/22 pulleys.

 

[onrof]

I believe it wears the front side looking at my collection of old belt if i'm remembering if i installed the belt readable or not. So i would think that is on the throttle. I would like to get the valve though since i've got piano wire holding my fuel rack to the motor just to keep it from blowing off. Where do I get that valve? I'm just going to call you..... thanks