Drivetrain Wouldn't a 2% crank and 15% sc pulley = more than 17%?
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#4
I am currently on my 3rd R53... On my first one I ran a 15% pulley and never had a problem on around 80K hard miles, on my second MINI I had a 19% pulley, and ran that for close to 70K miles with no problems, and I currently have 6k miles on a 17% pulley and 3% crank pulley, I have never had any problems with any of my cars, so I would say your fine, but thats just my experience.
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1.15 * 1.02 = 1.173
So the combined effect of the two pulleys on the supercharger is 17.3 %
#7
I don't think I was clear in my original post.
What im saying is that if you multiply x% by the supercharger pulley size, you will end up with a much different 'decrease' than you would if you mulplied x% by the crank pulley size, given that the crank pulley is much larger than the sc pulley.
In other words, 1% x sc pulley size < 1% x crank pulley size.
Am I way off base?
What im saying is that if you multiply x% by the supercharger pulley size, you will end up with a much different 'decrease' than you would if you mulplied x% by the crank pulley size, given that the crank pulley is much larger than the sc pulley.
In other words, 1% x sc pulley size < 1% x crank pulley size.
Am I way off base?
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#8
The actual physical size of the pulleys doesn't matter - just the percentage of increase/decrease.
If you increase the circumference of the crank pulley by 2%, the supercharger will spin 2% faster. If you decrease the circumference of the supercharger pulley by 15%, the supercharger will spin 15% faster. That's all the math you need - the fact that the crank pulley is so much larger than the supercharger pulley doesn't come into it.
If you increase the circumference of the crank pulley by 2%, the supercharger will spin 2% faster. If you decrease the circumference of the supercharger pulley by 15%, the supercharger will spin 15% faster. That's all the math you need - the fact that the crank pulley is so much larger than the supercharger pulley doesn't come into it.
#11
I am currently on my 3rd R53... On my first one I ran a 15% pulley and never had a problem on around 80K hard miles, on my second MINI I had a 19% pulley, and ran that for close to 70K miles with no problems, and I currently have 6k miles on a 17% pulley and 3% crank pulley, I have never had any problems with any of my cars, so I would say your fine, but thats just my experience.
#12
The smaller pulleys won't give you problems as people think they do. The point of not going to a 17% or a 19% like you have, is because they actually hurt the power due to all the heat being created in higher rpm's. If you only drive your car on the streets and want good down low torque then that is fine. However, on the track and auto-x a 19% will hurt your hp numbers.
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