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zzp under drive water pump pulley



An underdrive pulley is not a very great $/hp investment, but with that said it is virtually no compromise. it is made of lightweight aluminum and saves about 1 lb of rotating mass while spinning your water pump slightly slower. I have one on my car to go along with an Alt UD pulley, and while the differences may not be as noticable as putting on a smaller supercharger pulley, I cannot see how it wouldn't give me 3-4 hp and maybe .1 mpg's which will help with efficency.
 


From a reliability stand point, isn't there a reason why they didn't spin them slower stock?

Probably just a safety factor for the coolant flow. If you have the UD pulley and run low on coolant you might start over heating before a stock pulley.
 
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