Pulley Dabate!!! CHEESY!!!!
Laughing Gas
Joined: Aug 2004
Posts: 782
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I was interested in pulleys at one time, but i think BrianA said that they had problems not being able to power the alternator, waterpump, fan, etc. well enough, causing irreversible damage to the lower west indies and northern half of iceland.
Posting Guru
Joined: Jul 2003
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From: Scottsdale Az is home, St
You have to remember that UD Pulleys dont really "free up" horsepower, but slow down the accessories to "improve" horsepower. I dont like them, nor do I think its a good investment. I would rather save the 90 dollars ( About 78 dollars plus shipping) towards a chip or tuner, or even putting it away for a turbo. You can buy a BRAND NEW, not refurbished, t04E 57 trim turbo for about 350 dollars. 
In the end, I personally would not buy a UDP.
Garrett
In the end, I personally would not buy a UDP.Garrett
Laughing Gas
Joined: Aug 2004
Posts: 782
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That's exactly what i was saying, what garrett just said. It slows everything down, and detrimental damage may occur to the engine mechanism of your transporter automobile.
I wonder, with turbo, intercooler, and all piping/manifolds, and a TUNE, how much would we be looking at spending? DIY style, that is.
I wonder, with turbo, intercooler, and all piping/manifolds, and a TUNE, how much would we be looking at spending? DIY style, that is.
Postmaster
Joined: Mar 2003
Posts: 4,513
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From: La Tech University, La
Well, if you did the pulley correctly you would not cause any damage, what I mean by correctly is get a slower spining alternator that creates the same power. they are out there, as are ones made for higher revving engines that create same power at lower revs. If you where to get an alternator for a diesel for example they are made to work at slower RPMs. Also get a high capacity water pump and eletric fans. The only part I dont know if you could swap out to work just fine would be the power steering pump. Granted even those may be out there, again, check on soemting mad efora heavier duty truck that is designed to see lower RPMs but function the same. Of course, you could always go with an eletric water pump which would free up more HP along iwth the UD pulley and eletric fans. But to do it properly and save your motor you need morethan just a pulley.
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Senior User
Joined: Sep 2003
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There are too many drivability issues for such meager gains. Jimmy’s right. You could replace most (if not all) of the belt driven equipment to offset the drivability issues, but this would be fairly expensive and still not yield any real HP gains.
Thumbs down for under drive pulleys.
Thumbs down for under drive pulleys.
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Super Moderator
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From: Isanti, MN
Jimmy Dean, you can put on accessories that put out the same power at lower revs.......but that means they are harder for the engine to spin.
It's an issue of energy conservation. In order for your alternator, AC, p/s, etc to function right, they require a certain amount of mechanical energy. When you put on an underdrive pully, you aren't giving them enough energy, so you have to mount accessories that do the job at lower revs. BUT, in order to have the same effect at lower revs, they are harder to spin, pulling the same energy from the crank at lower revs as they would with a regular crank pully at higher revs. End result would be no gain at all!
Energy can't be created.....period.... In order to put more energy to the wheels, the rest of the truck's systems WILL suffer.
I think it doesn't make sense except for racing applications, that don't depend on spinning accessories at idle.
It's an issue of energy conservation. In order for your alternator, AC, p/s, etc to function right, they require a certain amount of mechanical energy. When you put on an underdrive pully, you aren't giving them enough energy, so you have to mount accessories that do the job at lower revs. BUT, in order to have the same effect at lower revs, they are harder to spin, pulling the same energy from the crank at lower revs as they would with a regular crank pully at higher revs. End result would be no gain at all!
Energy can't be created.....period.... In order to put more energy to the wheels, the rest of the truck's systems WILL suffer.
I think it doesn't make sense except for racing applications, that don't depend on spinning accessories at idle.
Senior User
Joined: Oct 2003
Posts: 117
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From: Cincinnati
I've had a 25% underdrive crank pulley on my car for 2 years. No charging issues at all, car still cranks right up in freezing weather (it was about 14 degrees this morning) and the car still has the original 5 year old Motorcraft battery it came with.
The only time you may have issues is if you let your car sit and idle for long periods of time. Also, if you have a sound system that draws a lot of power you may have trouble.
Oh yeah, don't buy one if you ever plan on getting supercharged
So I'm gonna have to go against the grain on this one, but it's just my opinion...and you know what they say about those
The only time you may have issues is if you let your car sit and idle for long periods of time. Also, if you have a sound system that draws a lot of power you may have trouble.
Oh yeah, don't buy one if you ever plan on getting supercharged
So I'm gonna have to go against the grain on this one, but it's just my opinion...and you know what they say about those
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Postmaster
Joined: Jun 2003
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From: Lufkin
but it's just my opinion...and you know what they say about those
What do they say about those?
I'm going against the grain so to speak on this one too. I don't really consider myself too naive, but I think the UD Pulley wouldn't be a total flat out loss. I wouldn't get one right now due to the fact that there would really be no point. If they gave me any power, it would be like below 5 hp's man...what's the point of that? BUT, when every bolt on is on, and pulleys are the only thing left, I think I'd get them.
Senior User
Joined: Oct 2003
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From: Cincinnati
If you're going to spend $100+ on an air intake, you might as well spend the money on a UDP..and on a near stock motor, the pulley will give you more power. Another advantage that an underdrive pulley has is that unlike intake and exhaust mods which net you top end power, a pulley will increase power throughout the RPM band. But like Garrett said, don't expect much power...you would pick up 5-10hp at the rear wheels and about as much torque, at most.
And Joe, about opinions...opinions are like a-holes, everybody has one
And Joe, about opinions...opinions are like a-holes, everybody has one
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Postmaster
Joined: Jun 2003
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From: Lufkin
And Joe, about opinions...opinions are like a-holes, everybody has one
And they usually stink! (you forgot that part) I almost said that, but I use that for "excuses" instead of "opinions" but both work great!
Garrett,
Because the vast majority of 20-30 year old newlyweds can't even dream of affording a supercharger.