Engine Drivetrain 1st Gen Cooper S Most liked posts in thread: 15% vs 17% Pulley

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

 

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.

 

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

- andrew

 

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.

 

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

 

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:

 

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

 

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.

 

That was just good a fax pas to pass up.

 

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.

 

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.

 

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

 

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.

 

Simple. Both. Done.:cornut:

 

Very logical advice, +1

 

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

 

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.