MCS 'Works' supercharger

[GTT 280]

The standard MCS supercharger has an overpressure of 11.6 PSI.
Can anybody tell me what the works version is ?

[S2000&CooperS]

It's either 14.0 or 15.0psi - I've read different things. But one thing is sure, the extra boost is definitely noticeable!

[QQQ]

With the jcw supercharger the maximum boost raises to 1.0 bar (14.5 psi); standard supercharger 0.8 bar (11.6 psi)

[jlm]

my non-JCW rig with the 15% pulley recorded 18psi max last night at the dragstrip.

[GTT 280]

Quote: Originally Posted by jlm

my non-JCW rig with the 15% pulley recorded 18psi max last night at the dragstrip.

How can this be if BMW have to fit an improved larger supercharger to gain their extra PSI. If you are getting 18 PSI then aren't you over straining something along the way ?

[Hubert]

I believe that JCW has got a huge safety margin in their design, just in case there're owners out there who like to drive at full boost all the time. They probably need this margin in hand to be confident enough to offer the warranty.

In reality, very few people would be consistently driving at max boost everyday so 18psi may still be ok for the standard supercharger!

[QQQ]

Quote: Originally Posted by EB MINI

How can this be if BMW have to fit an improved larger supercharger to gain their extra PSI. If you are getting 18 PSI then aren't you over straining something along the way ?

The JCW supercharger is not 'larger' than the standard supercharger, it just (like all the other tuners) uses a smaller pulley for more boost. Only other difference is that the JCW supercharger has ceramic (instead of teflon) coated rotors

[bigbaddaboom]

QQQ, how many times you mentioned that? heheh!

[QQQ]

Quote: Originally Posted by bigbaddaboom

QQQ, how many times you mentioned that? heheh!

To tell you the truth big, I wondered about that myself too when writing it, hehe.

I guess not enough though, still many out there who actually believe the jcw comes with a larger ss (Mike Cooper won't mind about that I reckon )

[Paul]

Still worth pointing out as QQQ says, because a lot of people think it's a different and/or larger charger altogether, which it isn't.

[jlm]

it is arguable that a ported head with less flow restriction would show less boost (while flowing more air/fuel), given the same blower output.

[GTT 280]

Quote: Originally Posted by Paul Mullett

Still worth pointing out as QQQ says, because a lot of people think it's a different and/or larger charger altogether, which it isn't.

So, aside of making money and the possible fact of warranty, why do they insist of using a new supercharger for the JCW MCS when they sould simply use the original one.

If there is no change in the structure of it, other that teflon and ceramic, surely these should both be equally robust ?

Just when I thought the JCW came with a bigger and better SChgr. - You do get a modified cylinder head though - you do don't you ????

[Paul]

The cylinder head as far as I know is ported and polished, a few people who've had a look have said not very well, however JCW/Mike Cooper claim a 7 bhp gain from the head modifications. He claimed in his webchat 20% increased flow of exhaust gases due to the head modifications.

Also cacording to Mike Cooper, again in his web chat, the supercharger has larger veins, abrasive coating on the rotors, and a smaller pulley and belt.

[Andy@Ross-Tech.com]

jlm's car has some other breathing mods as well, his car puts out more boost than mine with the exact same pulley:

[GTT 280]

Quote: Originally Posted by Andy@Ross-Tech.com

jlm's car has some other breathing mods as well, his car puts out more boost than mine with the exact same pulley:

Does this chart conclude therefore that the modified cylinder header of the JCW MCS conversion is a true benefit ?

Intrested to hear from Paul that the comments received about the JCW MCS cylinder head aren't that bad. How have these comments been qualified I wonder ?

Is there a modifiying house that offers the exact same modification spec as the JCW MCS upgrade ? eg. Cyclinder header, (possible SChgr), exhaust, ECU

In the EVO review, I was intrested to see the performance of the JCW and Schintzer mods in gears 4, 5 and 6. they seem to be better than the BBR mod which is 220 BHP.