Quote Originally Posted by ScottinMA View Post
Gary,

Agreed. I just wanted to keep people up to date with the most recent chatter from Alpine. As for the other company, a telephone call to determine whether it is, in fact, at 53 mm pulley is simple.
I've been lookin' at this for a couple of days, & the pic on their website is what got me to digging...now I gotta be the turd again...

According to this...

Alpine/NGM Stage II Supercharger Pulley 2.8"

This pulley was designed by NGM to bring the boost and power level of the Alpine supercharger kit for the 2.7L Tiburon up to Stage II level. With headers and catback and the addition of this pulley, you should see a boost increase of approximately 6lbs. Total boost you should see is around 6lbs.

$165.95 $145.95
This product was added to our catalog on Sunday 14 January, 2007.

The pulley they're offering is 2.8", the 5 lb. pulley on the Alpine S/C I've got, is approx (hey, it's cold out there) 2.25" outer lip - outer lip, which would put it near 2.125" actual dia.

Check me if I'm wrong here, but increasing the size of the driven pulley is going to make it spin slower.

It would stand to reason that their 6 lb. pulley is larger than our 5 lb. pulley because they're using a larger drive pulley on the crank.

We have a 6.5", 7.0", and 7.5". This pulley set will allow you to increase boost if you do not desire to change out the blower pulley. This set will also allow you to increase boost above and beyond the upper pulley change. We have plenty of combinations for you.


Our Alpine crank pulley measures approx 5", outer lip - outer lip.