[madmac]

Hi, i have had a works supercharger fitted to my cooper s and nothing else, the car seems very quick and being the sad muppit that i am i did some basic timmings on the performance. It seems to be doing 0-100 in just over 16 seconds, i am a little confused because that is the kind of performance you get from the full works package and packages like the Hartage. i was expecting an extra 15-20 hp gain but the 0-100 time seems to suggest more, is this possible or do you not need 200 + bhp to get quick 0-100 times?

[Will_'S']

The JCW car is not as quick as figures suggest. Rolling road tests have shown some produce less than the figures declared this id due to testing conditions i.e non-engineered enviroment.
As to the power output against times there's prob not much between a standard s and a jcw upto about 40-50 when the jcw will start to pull away. The main difference is in the bends the earlier introduction of the superchargers full boost means you can get more power quicker than the standard supercharger.

[madmac]

Thanks for your response, i accept what you are saying but i am still suprised that i seem to be getting similar performance to other modified mini's esp comparing it to the Hartge conversion. In the case of the Hartge, pulley upgrade + ecu remap +?

I guess the question really is if my timmings are correct and this suggests a similar bhp to either the Works or Hartge cars then it seems most, if not all of the power is coming from the pulley conversion rather than the ecu upgrade?

Anybody else out there running just a pulley upgrade with similar results?

[alski]

this might be part of the answer, if you have post o4 mcs, then with lsd, and 170 bhp you might
be getting the power down better, the bigger hp of the works wont be available until your moving a bit anway so reducing the difference between the 2 times, you may have smaller wheels?
this is ment to assist take off as well, also cold at moment might help slightly??
but to be honest you need to do back to back tests with the real deal to be sure

[madmac]

mk1 cooper s, 163bhp and no limited slip diff, i do have the works superchager which is supossed to have coated rotors giving better seal though. Apparently the 04 cooper s has the same supercharger with a standard pulley size, i wonder if the change in coating and better seal accounts for the increased bhp on the 04 mcs?

[MINIAC]

Quote: Originally Posted by madmac (original)

mk1 cooper s, 163bhp and no limited slip diff, i do have the works superchager which is supossed to have coated rotors giving better seal though. Apparently the 04 cooper s has the same supercharger with a standard pulley size, i wonder if the change in coating and better seal accounts for the increased bhp on the 04 mcs?

The term "04 MCS" has different meanings for users in the UK and US, so please use build date so we're both on the same page

Starting with July 2004 builds, MCS models were fitted with Eaton's 5th Generation Supercharger, the same type used in the Works Kit, albeit without the reduction pulley:

Quote:

The 5th Generation Superchargers incorporate an innovative rotor coating that allows for tighter internal clearances compared to previous applications. These tighter clearances allow for increased supercharger efficiency and performance, resulting in improved horsepower and torque at lower engine RPMs. [MotoringFile]

There were also changes made to the exhaust system and ECU map at this time, all of which contributed to the 7 bhp gain over previous models.

Most of the horsepower gains of the Works Kit are attributable to the reduction supercharger pulley.

[madmac]

Many thanks, i think this now answers my original question, allthough if it is true that most of the increased power is coming from the upgraded superchager on the works car i wonder what if any you are actually getting from the works cylinder head? Or is that only on there to help reduce heat and help the engineers tune the car to give the correct C02 levels? I wonder how much out of optimum tune for co2 reasons the works car is actually running at? i have been able to get hold of a works exhaust system as well, i have mainly bought this to enhance the experience, but i now wonder what extra bhp this should give if any?

[CoolCarStuff]

...I would do some research on here before fitting the JCW zorst... there are some interesting test results on here.....

[sam_a156]

Quote: Originally Posted by Will_'S' (original)

The JCW car is not as quick as figures suggest. Rolling road tests have shown some produce less than the figures declared this id due to testing conditions i.e non-engineered enviroment.
.

Well, there is JCW and there is JCW, check this out:

http://www.mini2.com/forum/engine-dr...t=dyno+results

In short, originally my JCW was about 190hp or so. Today, very close - or (with small air box mods) - slightly above the marketed 210hp.

It seems that BMW has shipped/installed many JCW packages with wrong ECU mapping at least in Germany and Poland - might be true elsewhere as well?

Initially (quite correctly) I did not feel big difference between MCS and MCSW, but after the latest ECU map...well, even my better half can tell

But as you can also read from the thread I linked above, you can do a lot with only a S/C pulley and ECU map.

Ps. Much of the JCW mods have to do with increasing the reliability (warranty)...not so much to do with power.