Engine Drivetrain 1st Gen Cooper S 15% vs 17% Pulley

Discussion in 'Tuning and Performance' started by goaljnky, Jul 30, 2009.

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  1. k-huevo

    k-huevo Club Coordinator

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    The JCW pulley is the best size SC overdrive pulley. Keep you money in your pocket or get an NS1 camshaft. An NS1 will provide more gain than the difference between the 11.45% reduction JCW and any smaller pulley.
     
  2. andyroo

    andyroo New Member
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    anyone ever sell their JCW pulley?

    i'm not really a power guy....but a little more oomph would be nice. how do pulleys supposedly improve street driveablity?

    - andrew
     
  3. mini_racer

    mini_racer Well-Known Member

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    the JCW pulley is a one piece design that is pressed on with the SC out of the car. It is not practical, maybe not even possible, to install one of these pulleys with the SC in the car.

    Get a two piece design pulley with a collet that clamps around the shaft. Talk to K-huevo if you want something larger than the commonly available 15, 16, and 17% reduction pullies. Keith can hook you up to a ~13% pulley from Werkin Mini.
     
  4. andyroo

    andyroo New Member
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    Interesting.....thanks. This isn't high on my list of things to do, but maybe i'll check out that 13% pulley.

    - andrew
     
  5. k-huevo

    k-huevo Club Coordinator

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    When an OE pulley like the JCW or stock pulley is removed, it deforms slightly and the land tops become scored where the two clamp halves of the pulley removal tool meet. To re-install on an assembled supercharger, the pulley would require heating to above 350 degrees for five minutes and then pushed on the shaft. Sections of the OEM paint/coating may not survive the high heat treatment. So, yes it is impractical to reuse an OEM pulley.

    Improved drivability may mean different things for different people. A reduction pulley will improve acceleration earlier in the power band up to a point, what you experienced before at 5k rpm is now available at 42.5k rpm, it won’t do anything for sub-3k rpm acceleration however, because you’re not on boost yet. Throttle lag can be perceived as poor drivability, for that symptom I like the healing power of the Sprint Booster.
     
  6. Nathan

    Nathan Founder

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    42.5k rpm WOW, you dropped a small turbine in a MINI?
     
  7. goaljnky

    goaljnky New Member

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    :ihih: I want me some of that.
     
  8. k-huevo

    k-huevo Club Coordinator

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    Things sure must be slow when admin & moderator have nothing better to do than gang up to ridicule a decimal misplacement. There was a time when Jerry could be relied upon to edit a post to his liking and Nathan to send a “courtesy†note identifying spelling or word usage errors. Admit it, you miss Nitrominis don’t you!:wink5:
     
  9. goaljnky

    goaljnky New Member

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    I do, I do. :sad:
     
  10. Norm03s

    Norm03s New Member

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    A different approach to MINI tuning but the 17% did it for me. Then the VGS from Andy.. BANG for the buck
     
  11. BThayer23

    BThayer23 Well-Known Member

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    So on a stock S engine with intake and catback, what would you recommend installing first, pulley or camshaft? Car is a daily driver with a half dozen track weekends a year and 80k miles, and the goal is to find usable power between 3.5k - 6k rpm and maintain reliability and engine life to the greatest extent. Budget is modest.

    I'm thinking there's an outside chance you'll say do the camshaft first, but I'm curious why or why not.
     
  12. Nathan

    Nathan Founder

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    That was just good a fax pas to pass up.
     
  13. mini_racer

    mini_racer Well-Known Member

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    #53 mini_racer, Oct 6, 2009
    Last edited: Oct 6, 2009
    I think you meant............
    That was just too good of a faux pas to pass up.

    Sorry, that was just too good of a faux pas to pass up. I mean come on.....if you are going to correct a faux pas, you can't have a faux pas in so doing. :D
     
  14. Nathan

    Nathan Founder

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    My only excuse is it was pre-coffee

    Besides internet law states that when pointing out a flaw in spelling or grammar one will make a mistake in doing so.
     
  15. mini_racer

    mini_racer Well-Known Member

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    Ok, I was not aware of that particular internet law. I am sure I will need to use it myself sooner rather than later........
     
  16. k-huevo

    k-huevo Club Coordinator

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    At 80k miles I would invest in a compression test first, if you have excessive blow by, a set of Total Seal rings and a light hone will probably net more than either bolt-on option. If you’re loosing compression by a valve, it’s time to consider a head. If all is healthy go on to the next step. Neither cam nor pulley will impact engine life so remove that as a determining factor. Now narrow it down to budget considerations for parts and labor. Are you paying for the labor? If not, the choice is narrowed to the part and the supercharger pulley wins the decision.
     
  17. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    Simple. Both. Done.:cornut:
     
  18. Norm03s

    Norm03s New Member

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    Very logical advice, +1
     
  19. Norm03s

    Norm03s New Member

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    Today, @09:58 AM and you haven't had coffee yet???
    Coffee first, then thinking, typing, doing stuff;)
     
  20. Nathan

    Nathan Founder

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    Well 8:58am, I'm in the central time zone. Coffee was brewing and I was just getting to the office from that long commute across the living room.
     

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