15% vs 16% pulley?

[Minipnut]

Just if you wanna drive the car to brisbane i can get it put on no probs its what... only a 3000k drive through desert Sheesh

[J u s t]

Quote: Originally Posted by Minipnut (original)

Just if you wanna drive the car to brisbane i can get it put on no probs its what... only a 3000k drive through desert Sheesh

Hahaha. Thanks so much for the kind offer mate .. But I'd have to give it a miss on this occasion. Will speak to other ClubMINI people on this end to see if someone has had a go at this themselves.

[Jaw_F430]

Quote: Originally Posted by Snowie (original)

Ohh how wrong you are - the fixing of a pulley is of paramount importance.

Pulley slip / misalignment = damaged SC = ££££ss

As Snowie has said here it is very important. I fitted a 15% MED engineering pulley as my first mod in 2005 which is the same fitment type as the M7. It failed about 2 months ago now, but luckily the belt tension kept the pulley on the SC and I managed to get home using no boost. I was expecting the SC shaft to be worn were the pulley had been spinning but when I stripped it there was minimal wear on the shaft, it was the pulley that was knackered.

The problem is that the MED pulley only clamps on a small part of the shaft, therefore the rest of the pulley does not have any contact with the SC shaft so exaggerated it is a balancing act!! Bad design IMO. The Alta V2 is made with a hub that you put on the shaft first and clamps the whole area of the SC shaft giving maximum clamping force and then the pulley outer goes onto the hub.

[DaFlake]

The design of the M7 is nice, but out of all the pulleys that I fitted, it was the one that had issues. the sleeve was very tight fitting and was slipping on the car. I had fitted about 15 pulleys before it and had no issues. This one was just a pain thus giving me a bad taste for them.

As Jaw pointed out, the Alta is a good design and the only pain with them is getting the bolt closeset to the SC base torqued as the lip gets in the way. Still, well worth the money in my opinion. That being said, I have the MINI Madness on mine and love it.

[MINIMANIAUK]

This time of year with 15% pulley the inlet temp to the intercooler is around 150 C @ around5000 RPM -with every 1% increase the temp goes up , if the charger has any wear the temp goes up ,if the intercooler is less efficient with oil inside ,or your intake filter not clean,etc etc - and all for what ? a couple of ft lb torque below 5000?

[k-huevo]

The V-2 design was the only pulley style I had issues installing; my recommendation is for the collet style V-1 MINI COOPER :: North American Motoring - Alta 15% Pulley Install Problems , post #12.

Here’s a how-to Lone Star Mini Club Forums - Supercharger Pulley Install .

I hope MINIMANIAUK meant to use Fahrenheit instead of Celsius; I haven’t see inlet temps that high even with a 19% on a heat soaked dyno run @ >38C ambient.

[D-MAN]

Have not had any issues with my M7 16% pulley, and no problems with the install, for what it is worth...

[Lucky Dave]

All of these pulley use some form of clamping which can let go.

Having seen and used the GTT pulleys for many years without any problems it could be worth considering.

On the road our run about mini is reduced by 20%!! and its very punchy, but not ideal for track work due to the extra heat, but I quite like changing gear at 5-6K and the pull is nice!

[MINI-Morgan]

Quote: Originally Posted by Lucky Dave (original)

All of these pulley use some form of clamping which can let go.

Having seen and used the GTT pulleys for many years without any problems it could be worth considering.

On the road our run about mini is reduced by 20%!! and its very punchy, but not ideal for track work due to the extra heat, but I quite like changing gear at 5-6K and the pull is nice!

The testing is going well then! Have you logged all your temps too?

[DaFlake]

What about cavitation of the water pump?