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Underdrive Pulleys
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<blockquote data-quote="DanPromote" data-source="post: 120814" data-attributes="member: 1834"><p>I've tested both undersized and lightened crankpully not on BMW but on Protons before. Nevertheless the results should be the same mechanically :-</p><p></p><p>1. Undersized pully - faster pickup but causes a lot of problems, car dies off suddenly during corners due to lack of battery power and fuel consumption is higher</p><p></p><p>2. Lightened pully but replica of original (same size as original) - has all the advantages of the undersized pully but none of the disadvantage as it is the same specs as the original pully, only thing is that it is made of Aluminium T7 material (the lightest grade and the toughest, same type of grade used for aircraft parts). Overall around 30% of the original weight only.</p><p></p><p>So if you have a chance, go for lightened pully but not undersized pully.</p><p></p><p>* Where was the undersized pully from? Suprisingly it is original from Proton! They used it for their export models and the car was driven for the past 7 years with this problem without knowing until it was taken out.</p></blockquote><p></p>
[QUOTE="DanPromote, post: 120814, member: 1834"] I've tested both undersized and lightened crankpully not on BMW but on Protons before. Nevertheless the results should be the same mechanically :- 1. Undersized pully - faster pickup but causes a lot of problems, car dies off suddenly during corners due to lack of battery power and fuel consumption is higher 2. Lightened pully but replica of original (same size as original) - has all the advantages of the undersized pully but none of the disadvantage as it is the same specs as the original pully, only thing is that it is made of Aluminium T7 material (the lightest grade and the toughest, same type of grade used for aircraft parts). Overall around 30% of the original weight only. So if you have a chance, go for lightened pully but not undersized pully. * Where was the undersized pully from? Suprisingly it is original from Proton! They used it for their export models and the car was driven for the past 7 years with this problem without knowing until it was taken out. [/QUOTE]
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