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Old 09-11-2006, 07:15 PM   #1 (permalink)
 
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Default underdrive pully=vibration=bad

I was told from more than one person that underdrive pullies throw off the balance of a motor and cause internal vibration. This internal vibration supposedly damages that motor. I see a lot of people talking about this as being a good mod. Whats the deal?
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Old 09-12-2006, 01:34 PM   #2 (permalink)
 
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I wish daewootech.com was opened to I could copy stuff from there...as it's been talked about allot. Most cars have a harmonic tensor built into the pulley that help balance things out...without that it does do allot of damage. Our cars don't have one but have some other system in place to help smooth out the vibrations. Still having a lighter/smaller pulley causes more pulses/vibrations in the engine.
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Old 09-14-2006, 10:21 PM   #3 (permalink)
 
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so having one isn't the best for out cars but not as bad as some.
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Old 09-16-2006, 08:01 PM   #4 (permalink)
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I think your over stating it.
On the plus side, it removes that chunk of cast iron, taking off 9 lb that the engine had to move directly.
10LB (origonal) - 1lb (new inproved pully)=9lb
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Old 09-16-2006, 11:33 PM   #5 (permalink)
 
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Quote:
Originally Posted by goldenwarrior
so having one isn't the best for out cars but not as bad as some.
Well I dont know for sure if it hurts the life of the engine, but it doesn't help. The engine revs faster...vibrates faster... all that.
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Old 09-17-2006, 09:53 PM   #6 (permalink)
 
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I would like to see the underside of one of our engines. It seriously feels like we have balance shafts. Various nissans have them and they do balance out the engine, but rob horsepower and cause the rpm's to drop slowly like they do on our cars. I know our number one problem is that heavy as hell pully, but if there are balance shafts that would also relieve alot of extra drag as well.
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Old 09-20-2006, 06:15 PM   #7 (permalink)
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If I remember right its internal weights and dampener. The UD pulley does alot for how fast the RPMs fall off, but alot of that is the trans and the TCM causing that slow rolldown. With the catback freeing the exhaust up when you lift off it and the torque converter lets go the engine falls off real fast but the car still has that heavy geared feeling. I was going to do a short vid of a couple of free revs to answer aquestion about how it should sound when you let off full throttle, Ill post it here so you can hear how fast it drops off.
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