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JCW Engine upgrade kit, does that include a NEW JCW Supercharger?
...or do they just retrofit the JCW upgrades to the standard supercharger on the S? Who know the answer to that question?
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CDMINI; Generation 1's; PW/B S, R.I.P.; BRG/Silver S traded; Chili Red/White MC traded; 2008 DS/B Clubman S, now the "ex", I met a FORD and one thing led to another....
From what I can tell, the 02-04 models have a different model supercharger than the 05-06 models. So the 02-04 JCWs get a supercharger upgrade, while the 05-06 JCWs just get the new pulley (plus headers, intake, exhaust, etc).
'06 MCS all have the same supercharger, thats right !
Prior to 7/2004 the supercharger was "only" 4th generation and therefor was not coated. The JCW-kit had the 5th generation supercharger as upgrade.
After 7/2004 the supercharger was coated, therefor 5th generation, but with the standard pulley. The JCW-kit uses the 5th gen supercharger again, but only with a smaller pulley.
'06 MCS all have the same supercharger, thats right !
Prior to 7/2004 the supercharger was "only" 4th generation and therefor was not coated. The JCW-kit had the 5th generation supercharger as upgrade.
After 7/2004 the supercharger was coated, therefor 5th generation, but with the standard pulley. The JCW-kit uses the 5th gen supercharger again, but only with a smaller pulley.
Edited. NM, your correct. I had 04 JCW and it had the upgraded SC. Correct.
The coating, well.... i switched from uncoated to coated some time ago. I did not notice any boost increasement !
I think the coating is good for that the hot compressed air does not flow back between the shovels. Some tuners here in Germany did some tests and they said that in low rpm, i.e. 3000rpm, there is little more boost available.
IT's a coating that is put on the rotors that wears away during initial use to get tighter tolerences. It reduces leakage around the rotors and is good for a few % in boost increase.
Everything I've heard up to this point says that the JCW pulley is 14.7%.
Well, I have both here in front of me ! Standard is 65mm and JCW is 58mm... now calculate for yourself.
Over here in Germany we always messure in mm and not in percent. So we avoid any mistakes by calculating. JCW has always been 58mm, we measured several from when the kit startet to now.
Well, I have both here in front of me ! Standard is 65mm and JCW is 58mm... now calculate for yourself.
I'm only said what what I've read, I'm not claiming from personal experience that it is correct! If the information is wrong, the information is wrong. I have no qualms about that.
Here's one place I probably got the idea:
Quote:
Originally Posted by Webb Motorsports
I have personally installed over 400 15% reduction pulleys, and have not had a single issue with any of them. I have installed 4 pulleys greater than 15% reductions, and have had issues with all of them. Based on this, the preliminary testing we did, manufacturer discussions, and the fact that a few months after we came out with a 15% reduction recommendation John Cooper Works came out with a pulley on their supercharger that was within .03" of a 15% reduction, I can confidently say that the 15% reduction pulley is the best choice for not only performance, but reliability as well.
But I've seen it elsewhere too. Oh well - if it's 12%, it's 12%! I have no problem being wrong. Did the standard MCS pulley size change between 2004 and 2005? Just wondering.
Well, I have both here in front of me ! Standard is 65mm and JCW is 58mm... now calculate for yourself.
Measurement of pulley diameter is based on chord diameter of the belt wrapped around the pulley, which is a (consistant) larger dimension than measuring the pulley directly. I believe Doctor O published the formulas in an older thread. The smaller chord diameter of the JCW pulley provides just under 15% increase in blower speed compared to standard.
Manufacturers of Micro-V belts publish standard tables on how to calculate this stuff, so we don't need to re-invent it here.
Pretty sure the zorst is only a cat back, no headers...
Quote:
Originally Posted by shinka
From what I can tell, the 02-04 models have a different model supercharger than the 05-06 models. So the 02-04 JCWs get a supercharger upgrade, while the 05-06 JCWs just get the new pulley (plus headers, intake, exhaust, etc).
2005 BRG/W JCW
2009 fJCW BamaCooperS's ole Red
