Zero problems with my 17% Alta pulley. They rented/borrowed me their puller with everything to use it. Idk if they still do it but mine worked fine. No regrets at all.

 

Just be sure to use a tourque wrench to put the pulley on, and a dab of lock-tite...it will be fine. Most folks did prefer the older Alta pulleys collet style fastening method (still used on virtually all other pulleys), but the one you got should serve you well...just get/borrow a puller.

 

Yep it will work fine for a D2D street car, as long as you arent an overly agressive driver. There are a lot of the V2 pullies out there, and I have only heard of a few problems off the track.

 

Thats te comments that worry me. Could uyou tell me what problems happened off track? As well as on track.

My driving can get agressive from time to time. And car will see track time about once a month.

 

Simply put the metal expands and contracts at different rates...so the effect is like tightening/loosening the bolts a bit...as long as you use a tourqe wrench and a bit of locktite, you should avoid this issue.
The advantage of the Alta v2 mounting method is it is a bit more tolerant to mounting on a SC ith prior dammage...like from a pulley that had previously slipped...or so I have heard. Installed correctly, no pulley should slip, especially a stainless one. Alta's pulley is aluminum, and they switched mounting methods...I don't think they developed a new version cause they felt like it...there is usually a reason....

 

Why does everyone say there pulley is aluminum? It is still a 2 piece design, the piece that fits over the supercharger shaft is stainless stell. The piece that bolts to that, is aluminum.

 

"I don't think they developed a new version cause they felt like it...there is usually a reason...." ZippyNH

Reason being R56 in this case.^^^^

Pretty much everyone slowed way down developing new parts for the R53 when the 56 came out, and ALTA was one of the first to jump ship.

Personaly I have seen a few bolts back out of aluminum pullies, and saw one that was totaly seised in place and the dealer couldnt even get it off.

 

It is still bolting a pice of aluminum to a pice of steel, the temprature fluctuations between the 2 pices stretch the little bolts holding them togeather and they come loose.

 

The vibration causes more bolt movement than the temperature change. considering the entire motor is made of aluminum, there is no problem with the pulley being made of the same material. If anything it has less rotating mass witch takes less energy to spin it. I've been running a alta v2 15% on the cooper for over 30k miles and ZERO problems.

The linear thermal expansion of aluminum from roughly 70* to 572* is only .00013"'s
and stainless steel is .000094"s, I don't think that .000036 of an inch is going to make any marginal difference.

 

lol those last numbers were crazy. i ordered the pulley package also and the intake system....hope everything turns out well. Then intake will be installed by me but the pulley by a shop.