Hi, I'm looking to get a 15% pulley in the not too distant future. As a disclaimer - I've done extensive searches and could find very little about the new Alta V2.0 pulley. I know 15% is 15% as far as power goes, and the aluminum hub makes very little if any difference in rotational inertia. All I'm looking for is anyone's take or first hand experience on this new design - it really is quite different than the others. It uses what appears to be some type of collet that attaches to the supercharger shaft totally independantly of the outer pulley part. Then the outer pulley part attaches via bolts to the collet (i.e. the outer bolts don't provide any clamping force). Most other pulleys rely on the circumferential bolts to clamp it to the hub, but with this design the circumferential bolts just hold the outer pulley to the collet.

Is this more secure? (I've read a very few accounts of the more conventional design slipping on the supercharger shaft & would like to reduce this possibility as much as possible). I know Alta makes good stuff - its just that the vast majority of people's previous experience has been with the classic version of the Alta pulley.

Thanks for any info!

 

We installed three of the new V2's this weekend and to be honest the new design does make sense to help slippage. However, that being said, the one part that didn't make total sense was the position of the two screws that hold the sleeve on. One is partially blocked by the lip on the SC making it hard to get an allen bit on it for the torque process.

Overall I was impressed with the pulleys. The one gripe aside, they work like a champ and I think they will help to reduce possible slippage.

FYI, I have a MINI-Madness 15% and love it as well.

 

There are already several pulley designs on the market that work perfectly well, but one feature of the Alta 2.0 pulley that I really like is that it provides an option for cars where the supercharger shaft has been worn or scored from previous damage.

Alta claims that their new pulley will clamp tightly, even if the supercharger shaft diameter has been reduced by as much as 20 thousandths of an inch, either from the damage itself, or from the machining/polishing required to fix previous damage.

I think providing a solution for those with worn shafts is much more innovative than simply varying the number of clamping bolts or using exotic materials for an otherwise-conventional pulley.

 

It will.... The way the new sleeve is made is very slick and has teh ability to clamp down to a much lower diameter. So, if the shaft is damaged, this pulley will probably do the trick.

 

I've had a 15% MINI-Madness pulley for 3 years before changing for a 19% Helix.

In 3 years, I've never threw a belt with the MINI-Madness. I thing a good supercharger pulley starts with a simple design.

Alta V2 looks very good. It uses the good design from V1 and adds great engineering to it!

 

When I installed my Alta V2.0 15% pulley, I didnt have the means to use my torque wrench on the little allen bolts. I also didnt use thread locker as per the instructions. I did get the bolts as tights as I could on the little allen wrenches, not over torqued. 2000 miles and no problems so far.

 

Thanks for the info! The Alta will definately be a contender in my pulley search (I have also heard good things about the Madness pulley, although I'm also considering the Helix as well).

 

I love my madness pulley but the V2 is a good design change.

 

I have been told that the V2 design makes it very easy to change to a smaller or larger pulley. All that would be requires would be small hands.

 

You would have been told correctly as the sleeve is the same for the smaller pulley. You simply have to get your hand in there, remove the screws and slap the new one on.

 

I am currently runnung the 17% and was one of the 3 Daflake hepled install.
Hearing talk of some wanting to go from 15 to 17 the V2 design would be much easier. It would definately be a pain to get in there with the engine as is, but not as bad as raising the engine again.

 

I have a 19% KMT pulley and it hasn't any belt slipage. Also all my friend here in Slovenia has the same 19% KMT pulley and they do NOT have any problems with it.

With 15% alta V.1 my belt everytime when I start my engine has sliped.
The grooves of that pulley are very bad. Sharp end which damage the belt.

Also the V.2 must damage the belt. This sharp cuting groves with holes couldn't be good for nothing. That is not the solution for sliping belt.

If you have the right grooves belt wouldn't slip! My KMT pulley is made in factory which producting pulleys for many acknowledged factory in the europe (and world).

So like I said there is no problems about sliping belt. The grooves has the right angle and the radious in the end, so there is no belt damage!!!

The cuting belt (what the holes in the grooves on alta V.2 DO) it ISN'T solution for sliping belt. It's just the way to destroy the belt and belt tensioner.

 

I can't fully comment on the "sharpness" of the grooves, but I will say that of the 4 MINI's installed, none have slipped. Alta, Mini-Madness and Helix are all good solutions IMHO.

I have never heard of KMT so I can't comment on them either.

 

I have never seen a pulley slip of any design.

Just wanted to throw in a tech discussion of pulley design as well. There are a couple of things I have done to the design that are unique for a few reasons.

1. WMS uses stainless steel for thermal expansion property reasons, considering the shaft of the supercharger is also steel. It also does not corrode like aluminum may.

2. WMS has changed the pitch of the grooves in the pulley to minimize belt slippage and friction.

3. I also reduced heat through friction on the belt sidewall to pulley interface by machining the pulley differently than other pulleys on the market. This technique also reduces the rotational mass.

4. WMS uses a center hole to allow for alignment checks as well as a further reduction in mass.

5. WMS has implemented a positive stop on both the pulley to shaft and pulley to hub surfaces for bolt torque.

Here is a link to the catalog page which can also link to the FAQ on our site.

Let me know if you have any other questions about our product or the Alta unit. The Alta bit looks like a nice piece as well - we have changed the groove design on our pulley for specific concerns after track testing through several seasons.

Hope that helps!
Randy

 

I've never heard of the KMT pulley either - sounds like it must be overseas only. Thanks for the info Randy - I'll check out the Webb pulley as well (from your description it does sound like a lot of thought & development has gone into it).

 

I have never seen a slipping pulley either. I have only read about them here and I think that was only once. Anyway, Randy's product is also top notch and recommended.