Aluminum pulleys offer no advantage in terms of weight, zip, nada. Heat is the issue, along with dissimilar materials, ie. SC shaft is steel. Ask Randy Webb, the expert in this field, why he won't put one on.

 

Thanks for all the input. I ordered an Alta from Randy. Nick

 

Thinking about it all, now that my work schedule has changed and I now have a day or two off during the week. I might reconsider getting the pulley now then waiting for the spring. I was thinking of the 17% as it is between both. Is the reliability just as good as the 15%? Might have to call up helix for pricing.

Garrett

 

15% Webb. Unless he was yankin my chain at the DC area pulley party my new 15% is a new Webb pulley. There was a lot of chain yankin fun going on though so I need to double check. Installed by Randy with a test drive after

Installed that and a Alta CAI at the same time. Wondered if I would really feel a significant difference. Ah, YEAH. Awesome. Wanted more low end power anf torque. Got it.

 

Aluminum pulley on a steel shaft is pretty standard engineering practice - I don't anticipate any problem there.

As to warpage, I seriously doubt it - the pulley is hanging right out there in the airstream in back of the radiator. The belt would never last if things got hot enough to warp aluminum.

George at Mini Madness has a lot more experience at this than I do, and this is what he uses on his personal and racing cars.

 

Same here as well.

 

i got a helix 19%, gobs and gobs of torque

 

I hope to have my Alta 15% S/C pulley, and my Alta 2% crank pulley installed next week. Nightly dreams of extra torque until then...

 

Alta 15% SC Pulley - Randy Webb
Alta +2% Crank Pulley - Randy Webb
Very Pleased:smile:

 

15% Germany made ET pulley bought from RSpeed at Ebay for $85 and installed by Randy Webb in PP. Satisfied Completely.

 

m7 pulley because of the new size and special coating that cut down heat transfered to the belt and ensured better grip. Don't realy notice increase in power any more.

Purchased from m7

Might be going Alta 19% soon.

James

why am I the only one mentioning the 16% from m7???

 

Any thoughts on the M7 16% pulley? Good, bad or otherwise?

 

Just asked about it. :smile:

 

It was great at first, but I don't realy notice the extra power anymore ever since I took my car in to the dealers for the emission recall and got my car back with running with a flat spot that develops in the 3000rpm range.That's why I'm thinking 19%.

The pulley is also different from what it first was, there is no more of that special coating, seems to be bad for the belts Peter says. I threw a belt a few weeks back, but am unsure that the pulley was the cause, I think it was the belt being to tight, I remember being barely able to get it on.
I put a stock belt on afterwards and all has been well since.

 

James thanks for the feedback, seems like the M7 may just be just a redesign of what the Alta pulley is for no real benefit. I think I‘m going with the tried and true Alta 15%. I want more power but also want the reliability that a 15% pulley would give and it looks like the Alta pulley is what most people are using.

Hope to see ya some time soon at a local MINI run.

 

I took off my JCW pulley and chose the M7 16% and an Alta 0% crank pulley. M7 for the 16% reduction and the Alta because of the weight. M7 looks good as well as the Alta, just a matter of choice.

 

yeah, fact that everyone had 15's made me want something different, so 16 it was. The m7 is a well designed piece like the others, maybe ol Pierre will bust out a 19% for some of us in the future.

Look foward to meeting you too man! catcha later.

 

He has his own pulley now. I have the 15% Webb pulley sitting in my room waiting for the break-in period on the MCS to be over. If I'm not mistaken, I believe Randy says on his pulleys he will have the Webb logo eventually but for right now it is polished without a logo.

 

17% Alta w/smaller belt.

LOVE IT!

/gary

 

19%.......Hellafun........With all my mods...i see over 16psi all the time.

 

Had a 15% Alta, W / GIAC liked it alot.
Went to Alta 19%, W / GIAC and Works Injectors. Very happy with the change. Went to a Gator belt (Shorter) have had no belt issues.

 

M7 16% SC pulley
M7 2% Crank pulley

Great combination.

Bill

 

M7 16% - Purchased and Installed by Randy Webb at Charlotte Pulley Party in June. I went with a 16% SC reduction to get a good bump now with a possible +3% crank pulley (for an effective 19% reduction) and GIAC down the road. Am I satisfied? Yes & No. I like it a lot, but I may still want more.

 

For the 16%, what belt did you use? Stock?

 

15% Stock belt

17% Napa#060539

19% napa#060535

You got me on 16% ( i wanna say stock ) .....Id check M7's site cuz i think thats theres.