Thread: !!! LET Motorsports Pulley Failure !!!
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Old Nov 23, 2008 | 12:23 PM
  #213 (permalink)  
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BrianBrave
<--- Huge Horsepower
Joined: Apr 2007
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From: So Cal
Default Re: !!! LET Motorsports Pulley Failure !!!
Originally Posted by onehundred80
My basic question is why increase the crank pulley diameter thereby increasing the speed and stress on every compoonent attached to the belt
Why not decrease the pulley sizes on those components you want to speed up, this could have led to the idler pulley being increased in size.
For example how fast can a water pump spin before it gets inefficient?Surely spinning the alternator faster than is needed wastes power?
Not the cheapest initial cost but? ......
Six-of-one -- half-a-dozen of the other.

Installing a new pulley on my electrically clutched supercharger that only provides 7HP in gains - - is just not worth the cost or the risk. Not saying it's a bad product - just not enough gains for the price and possibility of damaging my SC.

The largest crank pulley (185mm) increases the other pulley ratios (except the WP and Idler) by 20%. So you really only begin to overdrive them VS a stock crank pulley when your driving above 5K RPM. Your usually in the "sport" mode of driving at those RPM's - during normal driving there really is no issue. Example: 2,500 RPM with a 185mm is the same as 2,000 RPM with a stock crank pulley. No big deal.

That's well worth the risk and cost for the potential gains in PSI - - IMO.

A proper bearing will solve one issue, unfortunately the WP had to be reduced in size to clear the larger pulley. I've had to replace failed WP on my stock truck, so if I have to replace the WP on my SRT6 a little sooner as a cost of more performace -- OK.
 
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