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post #1 of 5 (permalink) Old 02-14-2008, 11:17 AM Thread Starter
 
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Underdrive pully dyno sheets

anyone have dyno sheets showing gains from ud pullies alone? I read an article on some site tht i cant find saying that after running a car with no belt at all they only gained 3hp so im skepticle.
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post #2 of 5 (permalink) Old 02-14-2008, 11:34 AM
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Underdrive pulleys do not free up much horsepower at all. Most companies say 10-12 but in reality it is generally about 3-7 or so. The link below was done on a 6.0L 2500 Series with ac. That claim is pretty accurate.

http://www.slponline.com/coming_soon_100230.asp

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post #3 of 5 (permalink) Old 02-15-2008, 06:21 PM
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Here is a semi-relevant dyno sheet from my Splitport 94 LX. The difference between the two pulls was that on the blue one I had installed a 25% UD crank pulley, swapped from the stock 94 exhaust to a much better flowing setup (click here for info on that), and tuned for 93 octane as opposed to 87 octane.



Keep in mind, that was back in 2003. If I felt like messing with the tune, I'm sure I could get more power out of the car now.

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post #4 of 5 (permalink) Old 02-15-2008, 07:27 PM
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exactly how much power do you think the exhaust attributed to that much of an increase?
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post #5 of 5 (permalink) Old 02-16-2008, 04:48 AM
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I'm not going to speculate there. It is evident that the exhaust did help in the upper rpm's, but as to numbers, I don't have a definite answer.

-Rod

Rod @ AzzKicker Cars
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90 XR7-The Meth Addict-KB SC'd 5.0L DOHC Stroker
2004 Mustang GT-The Driver-Intake/Exhaust/3.73's
1995 F150 4x4-The Mud Toy-5.0L/4R70W/33's/Warn 8274 Winch
94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
2 - 90 35th Anny Ed SC's
And a TON of parts cars!
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