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Old 05-10-2014, 12:42 AM   #1
CarNoobLovingIt

 
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Default Any significant gain from upgrading the crank pulley only?

I was thinking of getting the underdrive pulley kit upgrade but I don't want any electrical or cooling issues so I was thinking of just upgrading the crank pulley and leaving the alternator and waterpump stock. Is there any significant gain for just upgrading the crank pulley? I'm not looking for crazy horsepower numbers but any little bit helps you know so any input?
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Old 05-10-2014, 08:17 AM   #2
cliffyk
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Taking the diameter of the Steeda UDP crank pulley (4.875") as a base number, using only the crank pulley would result in under-driving both the water pump and generator by 25%; vs. the -39% (w/p) and -32% (gen) reductions achieved using the complete UDP set. This is not an insignificant reduction so some effect from using just the UDP crank pulley will be had.

That said, UDPs do not add any horsepower they simply reduce the horsepower required to power the water pump and generator--by reducing the speed at which they run--freeing up that HP (about 1.5 to 2.5 HP max, normally 0.25 to 0.5 HP) to push the car forward. This very small gain is noticeable only on hard acceleration and higher engine speeds, and even then not all that noticeable.

If you are the sort that never "floors it" and always shifts at 3k rpm then don't bother, you will never know they are installed. Fuel economy at cruising speeds will improve a tiny bit, maybe 0.25 MPG...
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Old 05-10-2014, 09:09 AM   #3
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Quote:
Originally Posted by cliffyk View Post
Taking the diameter of the Steeda UDP crank pulley (4.875") as a base number, using only the crank pulley would result in under-driving both the water pump and generator by 25%; vs. the -39% (w/p) and -32% (gen) reductions achieved using the complete UDP set. This is not an insignificant reduction so some effect from using just the UDP crank pulley will be had.

That said, UDPs do not add any horsepower they simply reduce the horsepower required to power the water pump and generator--by reducing the speed at which they run--freeing up that HP (about 1.5 to 2.5 HP max, normally 0.25 to 0.5 HP) to push the car forward. This very small gain is noticeable only on hard acceleration and higher engine speeds, and even then not all that noticeable.

If you are the sort that never "floors it" and always shifts at 3k rpm then don't bother, you will never know they are installed. Fuel economy at cruising speeds will improve a tiny bit, maybe 0.25 MPG...
Thanks bro, that's exactly what I needed to know.
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Old 05-10-2014, 03:45 PM   #4
DeathRattle
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If you install a UDP kit, you will not have any cooling or electrical issues at all...if the install is done correctly. I've had a UDP set-up on my 03 Mustang GT for years and never had any problems at all. For the price, it doesn't hurt to have it. You can find them really cheap used.
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Old 05-10-2014, 03:45 PM
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