R50/R53 :: Hatch Talk (2002-2006) Cooper (R50) and Cooper S (R53) hatchback discussion.

R50/53 4% Crank Pulley Sale!

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Old Jul 30, 2015 | 07:28 AM
  #1  
M7Speed's Avatar
M7Speed
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From: Mooresville,NC
4% Crank Pulley Sale!

A larger 4% oversize speed increasing crank pulley will add just that little extra added supercharger boost and performance. This beautiful design is a result of advanced computer modeling and high precision CNC machining. Made in the USA from billet 6061-T6 aerospace grade aluminum alloy with a deep black anodize coating, the M7 Speed 4% oversize - speed increasing pulley will provide a lifetime of reliable use. Weighing in at just 13 ounces and supplied with a brand new high strength ARP bolt and precision ground flat washer, the M7 Speed 4% crank pulley is best in class. Each M7 Speed product is Engineered....Tested....and Proven to PERFORM!

Retail- $154.00

SPECIAL PRICE & FREE Shipping - $127.00

www.m7speed.com


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Last edited by M7Speed; Jul 30, 2015 at 01:11 PM.
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Old Aug 3, 2015 | 09:32 AM
  #2  
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JaysinStrife
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From: Council Bluffs, Iowa
So I understand the HUGE debate of increased wear and such on undampened pulleys, but what if the car is driven sparingly? Does everyone still advise to run a dampened unit? Car has 61K so pick up an ATI or a lightened pulley? As I said car will probably be driven max of 5K a year if that.
 
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Old Aug 3, 2015 | 10:06 AM
  #3  
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ZippyNH
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From: Southern NH
Originally Posted by JaysinStrife
So I understand the HUGE debate of increased wear and such on undampened pulleys, but what if the car is driven sparingly? Does everyone still advise to run a dampened unit? Car has 61K so pick up an ATI or a lightened pulley? As I said car will probably be driven max of 5K a year if that.
If you go too small on the crank pulley, you run the alternator so fast you can overcharge the electric system and run the AC compressor too fast...
2% crank reduction is tested....some folks DO change the alternator pulley too to avoid issues...alta was selling one for a bit...
Changing the SC pulley keeps all the other items running at the same speed.....
Changing the crank pulley speeds EVERYTHING UP...
So dampened vs undamped debate assiide, there are other considerations.
 
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