O/T BMW Mini Cooper S
Turbo Mini Forums

I know a few on here have these, the supercharged one.

I've got our gerts in bits at the moment, it was making a horrible whirring noise which was the tensioner and idler pulley on the charger belt u/s.

However whilst I'm at it I'm thinking of fitting a smaller charger pulley.

What I have read so far seems to suggest I can just fit a smaller pulley and a harder plug and away you go with roughly another 30 bananas.

Really what I'm asking, has anyone done this, and more to the point is it do able with the engine in the car, as if not I won't bother.

Thanks gents

Edited by Tom Fenton on 2nd Apr, 2012.

My mate said its a bit of a bitch he ended up with the whole front end off (the new mini comes to bits so easy its just bolts) and did it that way! it don't reallyt show a noticeable differnce down low but its better top end and also the superchargers do need rebuilding after certain amount of miles :(

i think you need a proper puller for these Tom, i think there heated and cooled onto the shaft making it a pig to get off

Yes i moved to the darkside

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Well thats what my mate did with his and a custom air box and his made 196bhp

Matt W

Ian_W is your man to answer this Tom.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Company called gt tuning do the puller and the smaller pulley and does give ya more bananas

its abit before my time these unfortunately, i've not played around that much with the mk1 MINIs but i know the pulley is press fit on there and it is bloody tight in that area so you may struggle with the engine in situ.

They no longer sell them as a individual item only as part of there kit now !!

Yes it can be done by its self but its not recommended to go any more that 15%, also it does require the special tool to remove it. If you look at places such as gt tuning, lohen and mstyle tuning you can buy stage 1 kits like you can for the proper mini.

The turbo build has finally started

Buy the parts from Lohen, very friendly & helpful. They can sell you the removal pulley tool as well. Job will take you aprox 4-5hrs. Warm the engine up first as this will help you remove the OE pulley. You can run a 15 or 17% pulley, but if you do decide to go for the 17% you may consider changing the intercooler to a higher spec. Check the bypass valve is sealing properly too as you can gain boost this way too if not correctly set at the factory.

Pulley can be fitted with the engine in the car. You need to remove the drivers side engine mounts and jack the engine up to get enough clearance.

Edited by Grahamxx on 4th Apr, 2012.

Graham