15%-17%-19% pulleys!!!

[KMK163]

Hello guys, waht are the differences on these pulleys and which one do you prefer to use for having a bhp of around 200-210. Thanks.

[Tonyt3]

Quote: Originally Posted by KMK163

Hello guys, waht are the differences on these pulleys and which one do you prefer to use for having a bhp of around 200-210. Thanks.

Difference is circumferance, 200-210 a 15% is most suitable. The higher the percentage reduction, the more likely hood of problems.

JCW use around a 14.5% reduction.

[venox22]

The JCW pulley i measured last week, was 11.1% reduction, can anybody shed any light see below!!

http://www.mini2.com/forum/engine-dr...ly-11-a-4.html

[Richard Crofts]

Most basic tuning kits on the S are 200-225 and they use a 15% pulley

JCW is on or around 15% also.

19% is way too far IMO and will lead to all sorts of issues and a car that runs very hot is my guess.

I know of cars running nearly 230-50bhp with a 15% pulley

[Tonyt3]

Quote: Originally Posted by venox22

The JCW pulley i measured last week, was 11.1% reduction, can anybody shed any light see below!!

http://www.mini2.com/forum/engine-dr...ly-11-a-4.html

This just does not make sense. Are you sure you have your measurements right, have you double checked the maths, have you checked the part number? No one make 11% pulleys as far as I'm aware. There must be an anomoly somewhere.

[venox22]

Check the thread link, Roland at GTT first one at 11% a while back!!!

[Tonyt3]

Quote: Originally Posted by venox22

Check the thread link, Roland at GTT first one at 11% a while back!!!

sorry, couldnt be bothered to read it all. Did you check the part number against the proper part number? as I say, must be an anomoly somewhere.

[venox22]

no there is no part number on the face of the pulley that you can see, do you have the part number's for the jcw pulley/sc

[Tonyt3]

Quote: Originally Posted by venox22

no there is no part number on the face of the pulley that you can see, do you have the part number's for the jcw pulley/sc

no, but seeing Roland tomorrow, willask him if he's taken any off recently....

[venox22]

ok cool, thinking of getting his Hybrid JCW box conv, have you had that done???

[roland2003]

Hi, yes although we get a lot of JCW cars in ,we dont get to measure many JCW pulleys. Reason being you can't 'get in' to measure it in situ. Also we don't remove many as most people do as Tony has, which is fit the GTT +3% Crank pulley. -Much more cost effective as is lighter too. Regards Roland GT Tuning

[minti]

Supercharger-Pulley sizes (due to my limited knowledge):
Cooper S Standard: 65mm (belt 6PK 1388)
JCW & Kelleners (11%): 58,2mm (belt 6PK 1370 (or 6PK 1374 ?))
Digitec(DT) & RMS: 57mm
Hartge &
hitec inkl. MTH (13%): 56,5mm
Minimania (Ultrik): 55,6mm
Alta (15%): 55,6mm (belt 6PK 1365)
GTT 17%:
Schäfer: 54mm
Alta (19%): 54mm (belt 6PK 1352)

[KMK163]

Ok guys thanks. So a 15% is all i need. Another question do the different brands of pulleys have many differences? If i get an alta lets say or a gtt would it be a difference?

[venox22]

Works Pulley - 57.9mm = 11% reduction

[Tonyt3]

Quote: Originally Posted by venox22 (original)

Works Pulley - 57.9mm = 11% reduction
GP Pulley - 56.5mm = 13.6% reduction

Can I ask where you get this information from, as I dont beleive that the specs for the GP said there was any difference in Pulley size...?