I was originally against the 19% pulley because of the possibility of wear and tear on the supercharger. I would like to modify my car but still make it last. Therefore I have been picking mods in compination to ease the negative effects on the mod. I want to up my performance by going from a 15% to a 19%. People have been running the 19% for a while and no problems yet. It is obvious that the 19% will cause more heat to the supercharger in relation to the 15% or stock. Has anyone taken apart the supercharger to see the effects on the internals? This would be a good indication of some wear. Does anyone know if Erik or anyone else has done this. Everyone is basing the reliability of the 19% because there car hasn't broken down yet. Has anyone recording between 25,000 or 50,000 miles on the 19%? I am curious if the coating on the vanes is still intact and whether any excessive wear has been noted. The old one has some pictures of supercharger that was run with too small of a pulley.



Does anyone recommend the Endyne or Pilo mod to the supercharger? Does anyone make a supercharger cooler? The intercooler is great, but a water cooler at the supercharger would not only make the air cooler, but also prolong the life and efficiency of the supercharger, something an intercooler doesn't do. By putting a cooler on the supercharger it may be possible to continue to push the limits. Anyone with some thoughts?

 

As A matter of fact i took mine off today, after 40000 miles with a 19% i was plannig to take some pics and post them tomorrow, everything looked fine to me....

 

That is what I wanted to hear. Awesome. Did you have 40,000 miles just with the 19% or was the total miles of the supercharger. If that was 40,000 miles just with the 19%, how many miles does the supercharger have? Pics would be great. Thanks.

 

Caddman,

You are from Charleston right? If so, what types of outside temps were you running at with your car (i.e. was this late last summer, mostly during the winter...)? Thanks. Just trying to collect some more information about the pully.

I will be in Charleston in May on vacation. I really like the town. I lived in West Ashley for about 2 years and enjoy every chance I have to go back.

 

We drove to Charleston, SC last month in our Cooper CVT. Very nice and fun town. Lotsa of history too.

_________________
'02 Cooper CVT PW/B, MFSW, CD Boost, 15" 8-Spoke silver wheels.
'04 MCS CR/W, UJ Roof Flag, Aux Input, HK, Sport MFSW, Rain sensing, Auto dim mirror, 16" silver V-spoke wheels, Chrome grille, Chrome mirrors, OBC, front fogs.

 

40k with the 19%, 57k total on supercharger, approx 2k with 15%...

AS far as temps, i drive it every day so i have seen lows around single digits, and highs around 100... (dgszweda1, Hey give me a call maybe we can get together) i also do autocrosses in the summer heat, as well as race days from FL to VA..

Ill get some pics up in an hour or two

 

Here we go!!

 

Any sign of contact between the rotors or between the rotors and the case?

 

No, the "lines" i see on the ends of the rotors are the same lines i see on a stock SC i have here (im have modded the stock hence the SC change out) they are mere machine marks the coating is still intact over the marks, the pictures make the "ends" of the rotors look shinier but they are not thats just flash angle i guess. they are the same grey color as the faces of the rotors, i see no bare metal....

 

or "scratches" in the coating....

 

also i have spun the SC all "blades" look the same, no variations in color or anything to possible signs of overheating...

 

caddman,
Would I be able to have a 19% reduce pulley and commute to work about 70 miles per day? Is that safe or should I just get the 15%.........and plus one more question does this void my warranty?

thanks

tony

 

Excellent pics. Thanks. Some of the most informative statements regarding the wear on the supercharger.

How does the look of the blades (i.e. smoothness, physical appearance...) compare to the stock one that you have in the shop? Also, how does the color compare to the stock on that you have in the shop? What modifications are you having done to the supercharger, or have you already had them done? Do you recommend them? have you noticed any difference?

I know a lot of questions, but you have given some excellent information. Are you running a larger intercooler? Have you noticed any difference with using one if you have in the hotter temperatures? Thanks.

 

atn57,
I dont think that would be a problem, both the 15% and 19% void warranty

 

Actually i have heard that the JCW pulley is actually only 13.8% in reduction. Can anyone vouch for that? I think maybe the 17% is the best compromise but i am sticking with the 15%. I will be getting head work done probably, and an exhaust, and finally GIAC. That should be plenty of HP. No reason to change to 17 or 19 imo.

 

>>Actually i have heard that the JCW pulley is actually only 13.8% in reduction. Can anyone vouch for that? I think maybe the 17% is the best compromise but i am sticking with the 15%. I will be getting head work done probably, and an exhaust, and finally GIAC. That should be plenty of HP. No reason to change to 17 or 19 imo.

You are correct the JCW is right around 14%.

 

i think for some dealership its close enough for goverment work....

 

>>Does anyone make a supercharger cooler? The intercooler is great, but a water cooler at the supercharger would not only make the air cooler, but also prolong the life and efficiency of the supercharger, something an intercooler doesn't do. By putting a cooler on the supercharger it may be possible to continue to push the limits. Anyone with some thoughts?


Interesting idea. I wonder if anyone with more technical ability has any thoughts about this. How hot does the metal of supercharger get? Is this any hotter than the engine block temp? Is this any hotter than the TB temp? Would cooling the supercharger actually drop the temp of the air entering the combustion chamber? Or is it more efficient to attempt to cool the air at the intercooler?

 

I think if you could get it to work it would be a good idea, but i think ther would be problems with expansion diffrences that could cause big problems, for one you couldnt just cool the case it would cause it to "shrink" then ther probably would be an interference problem with the hot rotors, the rotors are spinning so it would be difficult to cool them, and if you were to have a "rifle bored" shaft it could cause a weaker shaft,(not to mention how would you get coolant into the blades themselves) we have to remember the SC takes around 60hp at peak RPM, so therefore maybe a shaft strength would be comprimised rifle bored, BUT most of these limitations could be designed around, but modifing would couldnt happen......

 

This is a little off-topic, but has anyone gotten the JCW upgrade (stronger supercharger, supposedly) and then swapped out the 14% (13. pulley for a 17% or 19% pulley? What kind of power increases would we be talking about here?

Doug

 

That would be a very expensive experiment.

 

We have a customer who swapped the JCW pulley for the 17% (note of interest: anyone with a removal tool will find that it works well on the JCW pulley as well because of its bigger flange). He drives like a maniac from NYC to Florida on a semi-regular basis. We didn't do dynos on his car, so I don't know if the increase was more than a non-JCW charger. From what I understand the "special" coating on the JCW vanes is being used for all MCSs now. In any case we dynoed JLM's MCS before and after installing a specially coated and ported charger. From what I remember, there wasn't much increase. Isn't that correct JLM?

 

I wouold have to agree, i just installed my modded SC, proted polished, blocked off blowby ports, etc, etc. and its a little louder whine, mut maybe 1/2 lb or so more boost, no dyno yet waiting on a more similar day, but its doesnt feel any diffrent on the butt dyno. granted i dont have the special coating i dont think, looks the same anyways, even though the supercharger is off an 04 that got a works upgrade, the SC only had 4 miles on it....

 

>>We have a customer who swapped the JCW pulley for the 17% (note of interest: anyone with a removal tool will find that it works well on the JCW pulley as well because of its bigger flange). He drives like a maniac from NYC to Florida on a semi-regular basis. We didn't do dynos on his car, so I don't know if the increase was more than a non-JCW charger. From what I understand the "special" coating on the JCW vanes is being used for all MCSs now. In any case we dynoed JLM's MCS before and after installing a specially coated and ported charger. From what I remember, there wasn't much increase. Isn't that correct JLM?


Erik,

Okay you can't leave us haging. What is the news on the new MCS being coated? Is this true? I am very interested in this statement, mainly because BMW has bought my Mini back and I am getting a new 04. Thanks.

 

Dgz:

My local MINI tech told me that all of the new superchargers are coated with the "special" JCW coating. It was a factory coating upgrade that they gave to the JCW kits first so that they could sell them as different and better. According to the tech, all of the chargers now have that same coating. I haven't seen this first hand, so it still has to be considered hearsay, albeit heresay from a pretty good authority.

Eric