Motoring Alliance :: MINI Cooper Forums   Motoring Alliance :: MINI Cooper Forums
Home Register Reviews Gallery Library Support M/A Sponsors Clubs Garage Search Mark Forums Read

Go Back   Motoring Alliance :: MINI Cooper Forums > 1st Generation MINI > Tuning & Modification :: 1st Generation MINI > Cooper S Engine & Drivetrain


» Random Garage

Bella

gregd
Advertisement

» Ad Links
» Recent Threads
Go to first new post Word Association
63,430 Replies, 1,043,358 Views
Go to first new post Soooooo Whatcha Eating?
1,267 Replies, 52,759 Views
Go to first new post What did you do with your MINI today?
11,765 Replies, 511,446 Views
Go to first new post WRC - 2016
73 Replies, 1,771 Views
Go to first new post Want amber rear turn signals
6 Replies, 817 Views
Go to first new post I miss my Whitney!
7 Replies, 112 Views
Go to first new post Best ODB2 Scanner?....
5 Replies, 145 Views
Go to first new post Audio upgrade to base system?
5 Replies, 1,064 Views
Go to first new post Noob Question
5 Replies, 315 Views
Go to first new post IMSA 2016
96 Replies, 2,990 Views
Go to first new post More upgrades for Boogie
11 Replies, 358 Views
Go to first new post MINI/Mini Trailers
37 Replies, 3,044 Views
Go to first new post Favorite Picture of your Mini!
78 Replies, 2,483 Views
Go to first new post New member to the fam!
17 Replies, 361 Views
Advert
Tire Rack: Revolutionizing tire buying since 1979

Sponsor

Reply
 
LinkBack Thread Tools Display Modes
Old 07-30-2009, 07:33 PM   #1
Super Moderator
 
goaljnky's Avatar
 
Join Date: Apr 2009
Location: LaLaLand, Left Coast, Overpopulated and Underfunded
Posts: 3,222
15% vs 17% Pulley

OK, so the car's been out of the body shop for almost 3 weeks now. And all of a sudden I have an itch. So, should I drop a 17% pulley into my factory JCW with RMW tune? Will I need to have Jan re-tune it?

Those running the 17: any long term negative effects?
__________________
My cars gain 50 whp simply by me getting in. Even on the passenger side.

I am the world's second most interesting man. Quench your thirsts, my friends!
goaljnky is offline   Reply With Quote
Old 07-30-2009, 07:41 PM   #2
Super Moderator
 
goaljnky's Avatar
 
Join Date: Apr 2009
Location: LaLaLand, Left Coast, Overpopulated and Underfunded
Posts: 3,222
P.S. What size is the stock JCW pulley?
__________________
My cars gain 50 whp simply by me getting in. Even on the passenger side.

I am the world's second most interesting man. Quench your thirsts, my friends!
goaljnky is offline   Reply With Quote
Old 07-30-2009, 08:01 PM   #3
Stage 4
 
mini_racer's Avatar
 
Join Date: May 2009
Location: Austin, TX
Posts: 1,052
I went with a 15% on my JCW. The JCW pulley I took off measured to be 11.45%. To maximize any gains a re-tune is recommended, and more important the further you more away from the stock pulley.

Most consider the 15 to be more for track and the 17 more for street, so the use of the car is a factor to consider.
mini_racer is offline   Reply With Quote
Old 07-30-2009, 08:25 PM   #4
Space Cowboy
 
ScottinBend's Avatar
 
Join Date: May 2009
Location: Bend, OR USA
Posts: 8,298
The 17 will generate more heat thus the reason the 15 is most widely suggested.
__________________
Sir, I will not allow you to insult me in this manner.......
Really? In what manner would you prefer? ......

If it uses lipstick or a dipstick, it's gonna give you trouble

2004 EB/W R53 with stuff
ScottinBend is offline   Reply With Quote
Old 07-30-2009, 09:21 PM   #5
Stage 4
 
Join Date: May 2009
Posts: 3,119
17 will give you help down low, but up high it'll spin faster than supercharger can handle, just generating a bunch of heat, but no improvement in power at higher RPMs. You're a track rat right? I'd stay with 15, it still helps down low, and is pretty much is the upper limit of what the supercharger can usefully handle at high RPM's. And it's not like there's going to be a huge difference in performance even down low going from 15 to 17, I don't think that small of a change is really going to be worth it, just my 2 cents.

I have the JCW, and eventually (when I'm having some other stuff done) probably swap out to a fifteen. Don't know why they didn't go with a fifteen in the first place....
__________________
cct1 is online now   Reply With Quote
Old 07-30-2009, 09:26 PM   #6
Founder
 
Nathan's Avatar
 
Join Date: Mar 2009
Location: Short North
Posts: 24,790
JCW didn't come with a 15 as at redline thats out of the S/C range and being OEM and all....
__________________
Bow wow wow yippie yo yippie yeah. GC
Nathan is offline   Reply With Quote
Old 07-30-2009, 09:33 PM   #7
Stage 4
 
Join Date: May 2009
Posts: 3,119
Really? Even 15% is out of the S/C range at redline? Didn't know that, I thought 15 was the upper limits. Learn something new every day! Maybe I'll just stick with my JCW.

The other thing is belts--seems folks go through belts fairly quickly with the 17's.
__________________
cct1 is online now   Reply With Quote
Old 07-30-2009, 09:58 PM   #8
Stage 1
 
Bimmer Lite's Avatar
 
Join Date: May 2009
Location: NJ
Posts: 187
Internet hearsay tells me the JCW pulley is an 10-12% reduction depending on which site you remember reading.

- Marc
__________________

mbiunno@roundel.org
Bimmer Lite is offline   Reply With Quote
Old 07-30-2009, 11:35 PM   #9
Super Moderator
 
goaljnky's Avatar
 
Join Date: Apr 2009
Location: LaLaLand, Left Coast, Overpopulated and Underfunded
Posts: 3,222
OK, a quick google search finds this:

MotoringFile Archive MF Review: Webb Motorsports 15% Pulley

which claims JCW is a 14.6 reduction. True?
__________________
My cars gain 50 whp simply by me getting in. Even on the passenger side.

I am the world's second most interesting man. Quench your thirsts, my friends!
goaljnky is offline   Reply With Quote
Old 07-30-2009, 11:40 PM   #10
Stage 4
 
mini_racer's Avatar
 
Join Date: May 2009
Location: Austin, TX
Posts: 1,052
Not true for the pulley I took off my 2006 JCW car. See post #3.
mini_racer is offline   Reply With Quote
Reply

Bookmarks

Tags
15%, 17%, pulley

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Powered by vBadvanced CMPS v3.1.0

All times are GMT -4. The time now is 12:37 AM.

Powered by vBulletin; Version - A Very Customized 3.8.2
Copyright ©2009 - 2016, Jelsoft Enterprises Ltd.
Clubs, Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.


Motoring Alliance is an independently operated web site supporting MINI owners and enthusiasts worldwide. All original artwork and design is Copyright © 2009 - 2016 Motoring Alliance.
Single Sign On provided by vBSSO