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With the under drive pulley the belt speed would be lower and all the belt driven accessories would be slower to protect them from the extra wear and tear of driving at highter revs a lot.
I don't think the belt tension would change and in theory the slower speed would make the accessories driven by the belt last longer.
I guess your trying to get some stats to see if this is actually the case?
What is the diameter of the original vs U/D pulley I'd be curious to calculate what percent slower it makes things over the original?
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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