Hey folks,
Need some input from the experts on if the SC on the 05/06 S is the same one as in the JCW kit or not. This subject was brought up in another thread in the general area and will be the deciding factor on ever going to a 15% pully in regards to engine and SC longevity.

Here is the quote
Quote:

Originally Posted by bavmotors
Doesn't the 05-06 mcs use the john cooper works supercharger?

And from me;
I would think not....but if someone more knowledgable could let us know it would be great. I'm getting my info from the Bentley manual and it shows the components of the JCW kit, one of which is the SC which apparently is engineered to handle higher speeds with more efficiency. To quote 010-16 in the 6/2006 edition of the Mini Cooper Service Manual.

"An Enhanced Eaton Supercharger with specially-coated vanes that generate increased flow pressure. The supercharger was fitted with a smaller pully, allowing the unit to spin at a higher RPM."

 

05/06 came with the jcw charger. Its really not much different on non jcw cars. It simply has black coated rotors that disapate heat better allowing increased effciency over early generation. The smaller pulley is only on the jcw kit cars.

The m45 unit is on all cars. 05/06 all got the jcw variant m45 which had black coating. The jcw kit cars also got a smaller pulley from factory.

 

The S/C's are the same, the coating refered to are on all the '05+ S/C's, just the smaller pulley. The reason S/C's were furnished in the kit was because of the pressing of the pulleys.

There is 0 data to support shortened engine or S/C life due to the 15% pulley.

 

Same as stated above....only difference is the pulley on the ,2005+ cars...

 

What about a 17% pulley (that's provides more charge, right)? I know that I don't have a supercharger on my car, just curious.

 

IMO , just do a pulley....
Stories of failed sc happen with both stock and modified cars....do other factors determine if/when they fail....
The coating served yo prevent heat transfer from the metal body, and to slightly increase efficiency by allowing for Tighter clearances....
Pulley size...
Much debate... Lots depends on driving style...
For me avalibility of 93 octane fuel tipped the scales..glad I did it...
The smaller sc brings the boost in at a LOWER RPM...makes in town driving more enjoyable...if you drive with a Lightfoot, you can even gain a few fractions of a mpg....
For a gen1 Mini, a pulley is a no brainer IMO...
Just need to pick a size...17% for street IMO...15% for folks who like to rev lots....
Add a bigger rear sway bar, and a CAI to make a bit more noise...and you have a fun, reliable car making safe power....

 

If you go to the john cooper works website, its separate from mini usa.com
There on that site they have posted several technical diagrams showing the HP, and Torque, and other read outs between the base, the S, and the JCW edition.
You can see exactly what the pulley sizes do, and the specs on the different cars.
If i remember right the major difference is the JCW super charger has a second air flow port that the S cooper doesn't have. That increases the amount of air it can pack into the cylinders.

 

The SC was the same on all 2005+ cars...both were coated also, JCW and S..
The difference was the PULLEY size...

 

The pully now, it was steel on the JCW, but alloy on a number of other aftermarket sources. I did read about one aftermarket pully on Motoringfile that was steel. I would think similar metals would help with heat transfer?

Also, for a person like me who shifts when the engine wants to at 4k, not at the end of the torque curve, would I see much advantage to a 15%

 

This is the key to a much discussed issue. The same can be said for the 17 and 19%. No individual, organization, or tuner has ever, or will ever conduct a controlled study on the various pulley sizes and their effect on longevity. Every opinion that you've read on it (mine included) are based upon conjecture.

BTW, I hear that Chili Red Coopers have a slightly higher top speed because of the aerodynamic properties of the clear coat. Anyone else hear that?

 

Hmmm, I heard it was just the "Red".

 

Most pulleys (except the Alta, I think), are stainless steel....weight difference compared to alloy is minimal...heat transfer is not much of an issue... More of a concern with expansion/contraction on very different materials (could loosen over time), or even have galvanic corrosion due to disdimilar metals....but installed right, tightened with a tq wrench, and maybe a dab of locktight used, installs are safe and reliable.
Guessing with your rpms/shifting habits, a 17% would be perfect...after months of debate, my mechanic, also a mini guy suggested it....have been very happy. Think of the reduction as spinning the sc faster at the lower rpms...so you are seeing the benefits of more boost at lower rpms...avoiding the lack of tq at low rpms (below 2000 or), and even improving the lower end a bit.
And yes...red is faster....every cop knows that!!!
I think I bought blue so my car is stealthy.... The red car behind me always gets the ticket!!