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<blockquote data-quote="ess530i" data-source="post: 299098" data-attributes="member: 13496"><p>hi guys...time to reactivate this thread with my nightmare! Pussy you’re damn right about the special rubber damper…</p><p></p><p>about 3 weeks ago i replaced my stock crankshaft pulley to lightweight ones. immediately after the upgrade (i would now call it a downgrade), there was vibration on my gearknob at certain rpm range. YES, there was substantial improvements on engine response which i thought could outweigh any issues i would face but wrong. the very next day, my air-cond belt broke. last week, my power steering hydraulic hose assembly broke and gone with the oil. today, my engine oil pump broke and my mechanic said it was his first time encountering such problem with BMW (also very rarely with the hydraulic hose assy). i can only think of one explanation which is the lightweight pulleys causing too much initial pressure to the belt system causing the components being driven to fail. lack of the rubber damper could also be the main factor as vibration can kill a lot of components. </p><p></p><p>the car is still in the workshop as i write and have yet to know the total damage. so far its RM120 x 2 (towing) + RM200 (aircond belt) + RM2,200 (PAS hydraulic hose assy incl labor) + RM1,000 (used oil pump incl labor) + RM900 (lightweight pulleys) = RM4,540.00</p><p></p><p>i will be replacing the lightweight pulleys to my stock one but its unfortunate i have to go through this costly experience. btw my car is supercharged so i'm still researching if the failures had to do with the incompatibilty with the SC or would affect stock cars as well. anyway u guys with or without SC better be informed and carefully consider before doing the upgrade. needless to say i do not recommend them at any cost as the risk is just too big.</p><p></p><p>here's an interesting article to read about this topic:</p><p></p><p><a href="http://www.dinancars.com/bmw/technial-info/the-dangers-of-power-pulleys-and-understanding-the-harmonic-damper" target="_blank">http://www.dinancars.com/bmw/technial-info/the-dangers-of-power-pulleys-and-understanding-the-harmonic-damper</a></p></blockquote><p></p>
[QUOTE="ess530i, post: 299098, member: 13496"] hi guys...time to reactivate this thread with my nightmare! Pussy you’re damn right about the special rubber damper… about 3 weeks ago i replaced my stock crankshaft pulley to lightweight ones. immediately after the upgrade (i would now call it a downgrade), there was vibration on my gearknob at certain rpm range. YES, there was substantial improvements on engine response which i thought could outweigh any issues i would face but wrong. the very next day, my air-cond belt broke. last week, my power steering hydraulic hose assembly broke and gone with the oil. today, my engine oil pump broke and my mechanic said it was his first time encountering such problem with BMW (also very rarely with the hydraulic hose assy). i can only think of one explanation which is the lightweight pulleys causing too much initial pressure to the belt system causing the components being driven to fail. lack of the rubber damper could also be the main factor as vibration can kill a lot of components. the car is still in the workshop as i write and have yet to know the total damage. so far its RM120 x 2 (towing) + RM200 (aircond belt) + RM2,200 (PAS hydraulic hose assy incl labor) + RM1,000 (used oil pump incl labor) + RM900 (lightweight pulleys) = RM4,540.00 i will be replacing the lightweight pulleys to my stock one but its unfortunate i have to go through this costly experience. btw my car is supercharged so i'm still researching if the failures had to do with the incompatibilty with the SC or would affect stock cars as well. anyway u guys with or without SC better be informed and carefully consider before doing the upgrade. needless to say i do not recommend them at any cost as the risk is just too big. here's an interesting article to read about this topic: [url]http://www.dinancars.com/bmw/technial-info/the-dangers-of-power-pulleys-and-understanding-the-harmonic-damper[/url] [/QUOTE]
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