Underdrive Pulley needed?
02-14-2006, 11:37 AM
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Underdrive Pulley needed? Is the pulley a needed mod? Some have it, some dont. Short of a higher potential to throw belts, and some small gains, is it really needed?
I'm scared to touch the stock pulley
unless it will really help the HP gains.
I'm scared to touch the stock pulley
unless it will really help the HP gains. 
02-14-2006, 12:07 PM
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i dont have one yet...but ive never read anything but good things about them...and dynos prove HP gains
sooo
your choice...im actually looking into the MARCH myself because its the best deal and comes with both belts!
sooo
your choice...im actually looking into the MARCH myself because its the best deal and comes with both belts!
02-14-2006, 12:16 PM
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I run a 25% Ud pulley and it has given me a about .2 down the quater, but non cammed cars it doesn't seem to make much difference, perhaps a little better economy,
but it does stop the belt squeal overrun problem.
I have never thrown or worn out a belt in 60,000 miles after fitting it.
I have the'powerbond brand'
but it does stop the belt squeal overrun problem.
I have never thrown or worn out a belt in 60,000 miles after fitting it.
I have the'powerbond brand'
02-14-2006, 05:19 PM
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I think the main reason that people get it other then the HP/ET/MPH gains is that when you're doing a cam swap you have to remove the stock pulley regardless of if you want to put on a UD pulley or not (QTP's two peice timing cover aside). You also have to reinstall a pulley regardless. You might as well put a better piece on, it's exactly the same amount of work as having a stock one.
02-14-2006, 06:18 PM
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Originally Posted by Zeus
I think the main reason that people get it other then the HP/ET/MPH gains is that when you're doing a cam swap you have to remove the stock pulley regardless of if you want to put on a UD pulley or not (QTP's two peice timing cover aside). You also have to reinstall a pulley regardless. You might as well put a better piece on, it's exactly the same amount of work as having a stock one.
That makes perfect sense. I am planning a cam swap, so that would work.
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02-14-2006, 07:33 PM
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I had an ASP underdrive pulley and didn't like it, I'm glad to be rid of it. It really effected the driveability of my T/A. It made my T/A very hard to steer at idle speeds, parking was a bitch. It made my turn signals work very slow and my battery went dead a few times.
I did notice a difference at the race track, I picked up a tenth on a 1/8 mi. track and my tires wouldn't hook as well. There were definetly power gains, I couldn't deal with the steering problems though, so I took it off. You will only notice it at the track not while driving normally.
I'm not going to say it's a bad mod, but I will say that it didn't work for me.
I did notice a difference at the race track, I picked up a tenth on a 1/8 mi. track and my tires wouldn't hook as well. There were definetly power gains, I couldn't deal with the steering problems though, so I took it off. You will only notice it at the track not while driving normally.
I'm not going to say it's a bad mod, but I will say that it didn't work for me.