Should i go from the 15% pulley to the 19%?

[Powerplay]

I was reading this thread and I though I could offer some information that I received from a MINI factory engineering person. Apparently overdriving the blower is leading to poor water-pump operation. Not because the pump is weak. Once the pump speed surpasses the design limit, it causes cavitation. Once you have cavitation the water will not flow. Fortunately this only happens at the highest rpm limits. A daily driver probably won't encounter this problem as the high revs are not sustained for long periods of time. On the track is another story...

The stock blower has no ceramic treatment like the cooper-works blower. The Ceramic rotors are a very tight fit. The clearance between the rotor and blower housing is very close. They can do this with the ceramic coatings as the rotors will not grow under full duty. The stock superchargers will fail in time. It's just a matter of time and excessive heat cycles before the rotors start to gall and fatigue.

Hope this helps

[2//KML\\9]

hey guys what will happen to the fuel consumption of the car if i go with the 15% pulley? does it changes dramatically or not? now with full tank i can do 400 km until the light on.

[Need4M3]

If you are using ur mini for track, i would recomand the 15% i heard the 19% gets to hot. For street ur fine with the 19%

[mcs]

im waiting to do mine. i have an 05 mcs with 15000 miles. im uneasy to the pulley but need more boost. Can anyone chime in on how long they have had pulley up grades with no probs et. miles.

[swest2507]

OK, I used to work for MINI, I have seen cars that came in with 19% pulleys. They didn't live long. Either the motor would blow up or the supercharger would. The biggest problem is that the 19% pulley spins the supercharger too fast, it wasn't designed to be spun so quickly and it usually goes first. If it doesn't then you end up with a blown engine

[Enzothemaddog]

I have used a 19% for a couple of years in my 'track only' MCS. I have to say you are right about eventual failure but its a long way off for most people. Its hobgobble about not tracking with a 19, most people do....or at least those with decent times if not a 17%.
As for the cavitation, i'm figuring out how to install a standalone electric water pump with temp adjustment. Adding this to JCW SC I bought so should perform without a problem.
I do have a backup SC and head if things go wrong but even with my rev-limiter based driving I expect a good 30-40,000 miles from it. Things like air ducts can slow down the failure but things do get very hot under there. But unless your a clown who does'nt realise a car needs to be cooled every ten or so laps then you probably will blow the SC with a 19%.
....IMHO

[djhellfire]

I have been using my %15 with superchips ECU flash for 60.000kms with no problems. It is both a daily driver and track car. A friend of mine has %19 on his car w/o intercooler upgrades and he is on 30.000kms or so with no problems. But under his bonnet it is way too hot. After we drive fast for 10 min there is no way that he can go past me.

For the fuel consumption; when you floor the pedal you can see the fuel going down. My whole fuel tank finishes like 180km with really hard driving all the time. But If i stay away from being naughty, I can go about 600km s with cruising around about 60-70miles/h..

[I Heart JDM]

hey any of you guy's test out the 17% pully. Any tuning or IC upgrade required? I know you have to get new spark plugs and a new belt, but is that it for the 17%? Is 17% kind of the best of bolth worlds from 15% and 19%? Any suggestions? I have about $500 bucks and lookin for a pully upgrade. Just don't know which route to take.

Thanks
Koya

[RalphzMCS]

if $500 is your budget then you could go with the 15% or 17%(add s/w and injectors later when you get extra $). There are some that run the 17% without software and bigger injectors, but it makes a really big difference if you do all three together.

[yeaaa05]

17% ftw

[kalvin]

i'm running the 17% with the JCW injectors. Its running strong i dynoed at 185@ the wheels.

[deep throat]

Where do you get these pulleys from?

[ESP]

In the US from

mini-madness
outmotoring
promini

I am sure there are a few others.

[deep throat]

Thanks for the info bro...

So is there still an issue with copreseeor wear and heat using the 19% pulley?

[Rascasee]

What I have found is that for the most all-around driving experience the 15% is adequate. But if you don't tie things together with the right kind of ECU set up, you won't get the most out of what you are trying to do.