hi all as you read in my last post i traded me m3 in on my mini and im looking to get a little closer to that good old m power.has any one done the over drive pully swap and can you acculy feal the diff?? and also its solt with or with out software, will the stock ecu compsate for the incresed boost? witch kit is a know good one?? thanks Chris

 

It's the most effective mod you can make on the car. The stock ECU can deal with a 15% pulley with no problem, and the power increase is quite satisfying, even if no other mods are done.

 

If I could figure out what you were saying I'm sure I'd have the answer, but I have no idea what you're talking about. If you want to get a 15% REDUCTION pulley that bolts in place of the stock unit on your supercharger, board sponsors like Webb Motorsports, M7, Alta, BMP/Promini and others would be happy to set you up with this item.

 

Biggest bang for the buck for the Mini bar none. Should cost you in the neighborhood of $400 installed at any experienced mini tuner.

Randy
M7 Tuning

 

first, welcome to NAM. :smile:

The 15% reduction pulley makes a healthy increase in power. The pulley attaches to the shaft of supercharger. Since the pulley is 15% smaller, it spins the supercharger faster, increasing power. No software is required.

One of the members of this forum has 125,000 miles on his MINI with the 15% pulley on it most of the time. It's one of the modification which has proven itself reliable.

 

Mine just arrived last night, now I'm searching for an installer that can do it right away!! It's the Alta and it looks great! I got it here for $106 shipped! http://www.jscspeed.com/mini/engine/alta_pulley.htm

 

Yay! We all agree on the pulley! :smile:

 

don't think about it for another minute - the pulley is an absolute must!

If you want to compliment the pulley - consider doing CAI and exhaust at the same time. Air cleaner can be as simple as changing stock filter for something like a TGI filter. Exhaust can be as simple as doing the one-ball .

The most hp/torque bang for the buck is pulley, CAI & Exhaust. After that you each pony comes at a higher price ! I recently did my MCS with the objective increasing hp/torque as cheap as possible (making a better daily driver) - total cost was about 800 w/ installation. I did 15 pulley, CAI & One-ball AND I LOVED THE RESULTS. Took about two hours.

see pic gallery - bahamabart

 

ya, but what was youi powerban increase? and i talked with my mechanic and he said that the stock pulley size is spinning the charger atr the optimum speed. He said that any more results in cavitation... i dont know..

 

This was the result of the 15% pulley on my car with no other mods, same dyno, same day:

 

Numbers! w00t!

 

YMMV!

 

Chris, do the pulley. I would recommend the Alta as it is stainless steel and installation meathod seems to be bullet proof. Do have an experienced installer do it. If you want more punch, the cold air intake and a good exhaust would be next. The stock computer will handle any of these mods but a good ECU upgrade such as the UNICHIP will improve the performance. I did the 15% pulley, Alta intake, and Milltek exhaust, dynoed at 180HP. It is also recommended to run a colder range spark plug such as a Denso. A UNICHIP is next as soon as I can get Randy at Webb MS to call me back and take the order, Randy are you listening???

 

Complete load of BS

 

The mechanic was probably talking about the waterpump. There have been problems with 19% reduction pulleys causing cavitation. The 15% is totally safe in this regard.

 

My 2002 MCS has a 15% pulley & Alta intake. When the pulley was installed I immediately noticed that I had more torque at lower RPMs. The seat-of-the-pants dyno is confirmed in the actual dyno runs that Andy showed. It like the difference between night & day.

Subsequently, I also added the German MTH software upgrade, and the MCS received another kick in the pants.

I have never heard of anyone having any trouble with their car after getting a 15% transplant, and I've never heard anyone complain about the results. I note that the JCW "factory" enhancement has a 14+% pulley on its "approved" supercharger.

Go for it !!!

 

ok then im ordering one now!!!!!!!!!!!!!!!

 

Wrong. The S/C pulley has nothing to do with any other pulley. The only way the water pump can spin faster is from a smaller water pump pulley or larger crank pulley.

 

Wrong. The water pump is driven off the backside of the supercharger, so changing the speed of the supercharger by 15% changes the speed of the water pump by exactly 15%. That said, I haven't heard of any problems from overspun water pumps.

 

Looking at Andy's dyno graph, i'm quite surprised at the A/F ratio. The stock run has a super-smooth A/F curve, but the pulley run looks pretty ugly in terms of how it jumps around. I wonder if the desired A/F ratio is jumping around at all or if really has trouble keeping the fueling where it wants it in that area of the map. As if the factory ignored the upper load ranges somewhat assuming it would never see those areas in real world driving. Either way, both curves are extraordinarily rich! I am quite familir with the fact that forced induction engines run significantly richer than stoich, but I would think we'd be looking at something like 11:1. That gets into the 9:1 range. I would think that one could safely lean out the mixture closer to this 11:1 range and pick up a little horsepower, but I don't have any experience with this motor yet, so I could be wrong. Maybe the charge temp is just so crazy hot that they have to run it this way just to prevent detonation. I know Evo's run like this from the factory, and just leaning them out some makes a noticeable difference. Is this basically what the 'chips' designed to work with the 15 percent pulley do? (along with perhaps some slight octane specific timing tweaks)

 

Here's a detail of the A/F on those runs:



Matt, is your employer looking into making MINI parts ? An Inconel manifold would be OUTSTANDING!

 

Me=DUMASS!

 

Andy,

You're a quick one. I guess if anybody here was going to pick up on where I work it would be you. :smile:

As for making parts for Minis. Not very likely. We've got too much on our plate as it is with just the VW/Audi crowd. However, that won't neccessarily stop me from digging into the binary on the weekends to home brew myself a chip. Particularly after seeing the A/F ratios on your dyno chart. :smile: But at least it doesn't look nearly as jumpy in the detail shot, would probably be pretty easy to cook something up that will add a few HP and throttle response. I'll look into it more and see what others are doing after the car arrives. (hopefully middle of next week)

 

I like what I'm seeing... I've had questions myself a bout the 15% pulley and you tech guys ie. Matt and Andy have shed light on a dark place and it sounds encouraging. I'm going for the Mods mentioned in earlier posts. CAI' pulley and exhaust to start then who knows.

Thanks for all the info
Matt I am looking forward to you results with the A/F tinkering, lets us all know what you find out.

 

some of the web sites for the pully state 03+ for year i have a 02 is ther a diffrance or do they just have ther years wrong