has anyone seen any problems due to changing a pulley on your mcs? this is without doing any other mods. the mechanic at my dealer says there has been several cars that came in with problems due to changing the pully.

 

Any details - i.e. what kind of problems? You mean electrical problems?The SC pulley shouldn't affect anything electrical. Changing a crank pulley (larger diameter) would overspin the alternator, but it shouldn't be enough to cause any 'problems'.

edit: this was originally posted in 'Electrical' hence my question above - in this forum (Drivetrain) the question doesn't make any sense!

 

there is a ton.....no make that tons of info to the contrary. start doing searches

 

Which post were you responding to, SpiderX? To the contrary of which perspective -- inMiMini's mechanic's or Eric's?

 

He is saying theat there is tons of info contrary to the mechanic saying there have been issues.

There are reams of info about there being no problems with the pulley and only a very few isolated problems with it, most of whcih are not really directly related to teh pulley anyway.

 

Why would the JWC kit have a simular reduction pulley if MINI knew it would cause problems with any of their other systems? I say game on!

BTW, I have no problems with mine, but its only been on 4 weeks.

 

I think the only problem....










...is you'll be more likely to get a speeding ticket

 

I did not mean to be flipant........talk to Eric at Helix, Randy at WMS or Ryan at Detroit Tuned and the point being made that the JCW kit comes for all practical purposes a 15% and what you have is a mechanic that probably miss diagnosed a problem (don't get me started) and the path of least resistance is to blame the pulley.

I have a thread going about doing a mod to the supercharger and someone posted the redline of the Eaton M45 at 17200rpm which is within the limits of the 15%.

As Ryan says the only problem is.........drum roll........you might get a speeding ticket

 

Well, I know I had horrible gas mileage for the tank right after installing the 15% Pulley. I had lots of fun though

 

yea i have no trouble getting one now. but ill tell you the passport laser jammer/ radar detector is the ****!!!

 

i was told gas mileage would increase when driving normal, but if stepping on it might decrease it a bit i will only know for sure when i get it back with the pulley installed.

 

With a smaller pulley does the engine rev at a lower rpm because hp is created at a lower rpm? If so wouldn't allow for bettr mpg due to lower rpm?

 

Yes, it does theoretically allow for slightly better milage since you can make more power at a lower rev. However, most after most people get the pulley put on, the part of the brain that likes to have fun does not allow their foot to stay out of the gas, at least for a couple of weeks.

 

I don't argue with that. Was just wondering for crusing

 

I just had my 15% installed this past Sunday. I have been told that it was not safe in regards to fuel management to run a 15% w/out tuning. I think there are plenty of folks out here who just have a 15% w/out any tuning who have gone problem free,right?

Could this be one of the concerns the mechanic was trying to talk about?

 

Wouldn't engine speed still be at the same RPM when you're cruising at 60mph whether you have a stock, 15% or 19% pulley? Just because it's making more power at the same RPM does not mean it will cruise at a lower RPM.

 

From what I have read, the MCS runs really rich and you shouldn't have any problems with air/fuel mixture with the 15% pulley but you won't be able to get max hp from the pulley without tuning.

 

Could you please be more specific re 'tuning?' Are you taking chip, or what?

Thanks !!!

Hey Leel, are you running just the 15% pulley or other mods too?

Hugh

 

Don't mean to hijack but since this is heading off topic anyway...Is there a REAL seat of the pants increase in low end torque by just adding a 15% pully to a stock car? I want to feel a real diference, not a "Gee, I think it might be quicker" feeling.

 

A few solutuions are MTH, UNICHP, APEXI, and GIAC. You can do a quick search in this forum and you will find all the information you will need.

 

I think it depends on what gear you use. I have been thinking and have come to this conclusion; if a pulley reduces the chance of a downshift, or allows more use of the 6th gear instead of 5th, then you 'may' (not calculated yet) be running the SC at a lower rpm then before.

 

Yes, that is what I meant.

I remember reading that too, I believe Alta themselves had released this info. I would like the chip, but my gas here is limited to 90 octane; possibly when I get back to the states.

 

Bikeguy57,
No.
The pulley will create a noticeable increase in power in the middle and top end, but it will not "fix" or dramatically change the low end torque problem that many of us feel. Certainly a good mod, but don't expect a miracle regarding the change in torque.

 

I have had the 15% pulley for about a year and I have a K&N panel filter now that someone was gracious enough to give me while I decide if I want to get a CAI or not. I will be getting the MTH software soon after I get the latest emission thing loaded at the dealer, I just have not had a chance to get there.


I think the reason that milage might improve is beacuse the MINI runs so darn rich in stock trim that you are throwing fuel down the exhaust pipe to be burned by the CAT. At any rate, we are not talking much of an improvement.

 

Well, for the record the JCW does replace the supercharger as well as the pulley. From what I understand the blades are coated with a lower friction coating to compensate for the reduced pulley size