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BigD
GenIII
4/06/2001
11:14:37
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 Subject: Underdrive Pulleys
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Message:
Does anyone know the benefit of underdrive pulleys? I have a 4.7 and I am contemplating if there is a good reason for me to get the pulleys.
2000 RC 4.7L V8
3.92...Mods on the way
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Shawn
GenII
4/24/2001
19:42:41
| RE: Underdrive Pulleys
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Message:
They free up some horsepower by creating less parasitic drag on the engine.
Shawn Keefe
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Boomer
Unregistered
4/27/2001
19:47:00
| RE: Underdrive Pulleys
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Message:
They do free up HP by reducing the weight of turning componets and by turning items such as a/c and power steering less. You may run into a problem with the a/c not putting out as much, if you have a sound system you'll need to get a higher amp alternator. Just a couple of pros and cons....
Boomer
97 4x4, 5.2, JBA's, other stuff and MUDDDDD.
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Kris
*GenII*
4/28/2001
00:59:20
| RE: Underdrive Pulleys
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Message:
Nope Boomer, the all underdrive pulleys are only for the Waterpump, Alternator, and the Crank. The A/C and the powersteering pullies stay stock, the belt still moves at the same speed so the A/C and the steering will NOT be affected. I know this because I put pullies on my truck from ASP. Only the water pump and the alternator turn slower due to a bigger size pulley size.
Kris Harnack
1994 Dodge Dakota SLT
V6 / RC / SB / Auto
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Bernd
GenIII
4/28/2001
01:00:46
| RE: Underdrive Pulleys
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Message:
And the waterpump pulley can be done as well. I have a connection that builds custom pulleys for that purpose.
Bernd D. Ratsch
1997 Dodge Dakota SLT
Supercharged w/Nitrous
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kota on 20s
Unregistered
4/28/2001
01:57:19
| RE: Underdrive Pulleys
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Message:
so are they worth the money? can you really feel the difference?
Eric 98 dropped on 20s
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Bernd
GenIII
4/28/2001
14:58:24
| RE: Underdrive Pulleys
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Message:
For those few extra ponies for the race track, yes. For you charging system, no. If you're going to be swapping out pullies, stick with only the Crank pulley.
Bernd D. Ratsch
1997 Dodge Dakota SLT
Supercharged w/Nitrous
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Boomer
Unregistered
4/28/2001
15:06:53
| RE: Underdrive Pulleys
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Message:
It's a serpentine belt thing......1 giant belt turning all these other thingies, you mess with the size of the pullies the rest will run but different speeds, now if one had a belt for each individual item (a/c, alternator, etc.)... But I'm no physists (or spelling bee major). All the turning power comes off the crank's pully, that's where it all starts, if you change the size of that one, the rest are effected (not by much though)
To answer your question.....the ones I put on my Sebring did help, I noticed a change. But as far as this engine, I don't know.
Boomer
97 4x4, 5.2, JBA, need more power!!! No more mud, washed it today!
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jeffster
GenIII
4/28/2001
16:40:31
| RE: Underdrive Pulleys
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Message:
Does the tentioner have enough adjustment that you don't need a new belt if your swaping out the crank pully?
Waiting for my 2001 black 4.7 RC Sport 5 speed 3:92 limited slip
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