Improve bhp & torque: Light weight crank pulley & alternator pulley

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Guna;449029 said:
Despite all this negative issues about lighter pulleys I am still very curious la guys.I was talking to a certain reputable aftermarket shop guy that he has fixed it on hundreds of cars over the last 3 years with no major problems.He said he is aware of the risk if you put in the wrong ones but he almost swears by what he has.He mentioned of a particular brand called RUFF and that it would cost somewhere in the region of RM2,400 plus labour to change three though the kit comes in a set of fours.He was about to explain why only three when he had to put the phone down coz he was in the middle of something.I was also talking to some friends who drive some fast cars like Audi Quattros who don't seem to have a problem with the mod.The idea of deriving that much power from a simple and yet not so expensive mod is really tempting guys and I hope some super sifus here could give us the serious pros and cons.But for now,I think I'll hold the plans till I'm assured.

i think the other pulley is the alternator pulley which is a big No-No. It basically under-drives your alternator and will affect BMW's sensitive electrical system, so the aftermarket guy is right in not installing the alt pulley. I'm assuming that the set of four pulley also includes the lightened crank pulley.

http://www.ruff.tw/BMW/CP.html
http://www.ruff.tw/BMW/UP.html
 
RM2k plus for pulleys is similar to what they're asking for ECU re-maps.. the latter more effective in unleashing extra horses perhaps?
 
mizhan;449046 said:
RM2k plus for pulleys is similar to what they're asking for ECU re-maps.. the latter more effective in unleashing extra horses perhaps?

True bro but think of the what is the effect of both things done.....I'm trying to polish up my maths.....now sifus.....is it safe?
 
B33mEr;449045 said:
i think the other pulley is the alternator pulley which is a big No-No. It basically under-drives your alternator and will affect BMW's sensitive electrical system, so the aftermarket guy is right in not installing the alt pulley. I'm assuming that the set of four pulley also includes the lightened crank pulley.

http://www.ruff.tw/BMW/CP.html
http://www.ruff.tw/BMW/UP.html

Thank you buddy,that was quite informative.I'm wondering if you have any experience with these things?would you care to share?
 
Guna;449074 said:
Thank you buddy,that was quite informative.I'm wondering if you have any experience with these things?would you care to share?

Nope ... i don't have any 1st hand experience just reading and listening feedbacks from those that have. Check out http://www.uucmotorwerks.com/ they have a host of articles explaining the do's and don't when it comes to pulleys among other things :D
 
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