How much are pulleys for a supercharger and which one has greater performance, a bigger or smaller pulley?

You can buy a pulley fairly cheap for about $60 US but in order to change it, because it'* pressed on, you will have to buy a removal device that costs about $150 US.

Going to a smaller than stock pulley has the effect of increasing the rpm of your supercharger for any given engine rpm.

Very significant power gains, depending on how much smaller you go. A lot will depend on what other mods you have done in order to free up your intake and exhaust restrictions over stock. If you go too small you will get knock retard, which will defeat the gains. Your 93 is a Series 1 engine with a smaller supercharger than my Series 2 so it has a much smaller stock pulley than mine.
***** will give you some good advice since he has the same engine.

I went from a 3.8" stock to a 3.4" and gained about 30 hp and 50 ft-lbs of torque. Real seat of the pants improvement.

Yes, pullies are around $60-70 US. The removal tool can be purchased for $130, but rented for $30. If you aren't going to remove the pulley more than 3 times, there is no reason to buy the tool, because it won't be worth the cost.

A smaller pulley will make the blower rotors spin at higher rpms, which will compress more air making more boost. The problem is that if you go to a pulley that is too small the blower will be making too much heat (when you compress air you generate heat) and it will cause knock which defeats the purpose of running higher boost. Because of this, you can only go to a certain size pulley with certain mods.

I don't know what size pulley would be good for you, but I would guess around a 2" pulley. Talk to willwren, he can definately help you out with that.

Yup, it definately isn't some little gain like an air intake or anything, you really feel it, and it really wakes up the car. One of my neighbors with a '97 GTP came over and was asking about smaller pullies for the supercharger and asked how much power it added. I told him a 3.4 pulley on a stock GTP would add 25-30hp, and he knows cars pretty well so he knows that is a significant gain, and he didn't seem to believe me. So, he said he might order a 3.4 pulley for his '02 40th Anniversary that he is supposed to be getting very soon, and I think he will be quite suprised with the gains, he seemed a little skeptical.

If there is anybody on here that hasn't put on a smaller pulley yet, DO IT. You WON'T regret it. You will love the extra power!

Okay, I am liking this conversation here! For my car, what is the recommended pully for my M62?

I don't know anything about pulley sizes for the Series I L67'*. I know that there were different sizes for the 92-93 then there were for the 94-95. I think the size you need is a 2", but if I were you I would send a PM or email to willwren. He should definately be able to help you out.

I remeber seeing on his signature that he has a 2.2" so I guess your right. I will Pm him soon. THanx

Stop the presses

NEWS FLASH!

The series 1 isn't a press-on. It'* keyed. You can use a standard gear or pulley puller, either a 2-jaw, but preferably a 3-jaw.

Series 1 differs. There'* one size for 92/93, and another for 94/95.

The first performance step for the 92/93 is 2.2" or 2.25", depending on who you buy it from. The stock 2.5" 92/93 pulley is the next step in performance for the 94/95.

Going to a 2" for the 92/93 is very extreme unless you have alot of other mods, and take VERY good care of the Eaton. Before going with the 2.2", you should have AT LEAST: Custom intake and cone filter (preferably with CAI or heat shield), 180° thermostat, preferably drilled, and another tranny cooler.

Buy your pulley from www.pulleyboys.com and make sure to get the gatorback belt with it. For the 92/93, because of the smaller diameter, the ZZP oversized idler is STRONGLY suggested by yours truly. You need it to get enough belt wrap around the smaller SC pulley to prevent belt slip.

Any other questions?

There'* a post in Forced Induction somewhere that I made to show the difference in the idlers for the 92/93. Find it, and consider it your bible for this mod.

Now let me scare you. With my raised redline (courtesy of Jet Performance Chips) and my smaller pulley, my M62 is ripping along at 13,000+ rpm'*. You better take VERY good care of the SC, or you'll be doing a rebuild on the SC in no time.

This thread is now moving to Forced Induction.......