Underdrive Pulleys?? - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-04-2008
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Underdrive Pulleys??

I see a lot about these bulldog underdrive pulleys or something like that. Are they worth the money? what do they do?
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Old 12-04-2008
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Underdog, www.stuffforyourranger.com/store

Everyone that runs them says they're great, a inexpensive way to free up more power.
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Old 12-04-2008
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They slow down things like your alt, air compressor, power steering pump, etc.. so there is less parasitic drag.

Upside: You gain a little power

Downside: All of your accessories wont run as well at idle.
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Old 12-04-2008
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The accessories will still run just as good if you get the pullies to go along with them. The only time you'll notice a difference a difference is if you have a heavy wattage stereo system.
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Old 12-04-2008
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so they're a pretty awesome upgrade??
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Old 12-04-2008
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so if your pushing 2500 watts with an aftermarket 180 amp alt then a pully will screw things way up right? if not im all for it who wouldn't want more power..
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Old 12-04-2008
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They aren't a bad upgrade. I have heard someone talk about alternator issues?? But i am assuming its cause you are changing out the size of the pulley. Other than that they aren't a bad idea.

But I am sure this thread will turn to a debate cause some people love em and otherwise will just bash them.
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Old 12-04-2008
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There is a new pulley for the alternator that speeds it back up to stock RPMs.
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Old 12-04-2008
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^^ Well there you go problem is solved.

My question is doesnt this mess up the belt length having a ton of different size pulleys?

EDIT:

I know there is a different belt for the pulley set but what if you only use a couple of the pulleys?
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Old 12-04-2008
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Quote:
Originally Posted by fddriver02 View Post
There is a new pulley for the alternator that speeds it back up to stock RPMs.
so then what you get less power right? but you still get more power then stock? so lets say you get 20 hp from the pully but when you put in the alternator pully you not get 10 but still that 10 more then stock? [using the hp numbers as examples]


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Originally Posted by jaycheetwood View Post
^^ Well there you go problem is solved.

My question is doesnt this mess up the belt length having a ton of different size pulleys?

just loosen the tension er
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Old 12-04-2008
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I believe that the alt pulley doesnt mess with the hp/t numbers.... if you have put them on before... the weight is incredible.. the weight of a stock alt pulley felt the same as the new underdog crank pulley... thats gotta say something right there... Ive noticed much better mpgs, better pick up on the bottom adn topend... plus you get a cool whine lol.... but if you are pushing some serious wattage id suggest getting the alt off an exploder they are bigger... but if you are just running stock lights and stero you will be fine... if you have offroad lights they will dim a little... but I think its worth it at the pump even though gas prices are down

But I havent seen a dyno sheet that proves that the alt pulley will make you lose hp/tq. The highest hp and tq is 8.4 adn 11.1 ftlbs
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Old 12-04-2008
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i don't understand what you asking with your numbers. ok the under drive crank pull slows the accessories down and at idle they will lag a little i have a 2000 watt system in my probe when i have one on that and at idle i could watch the gauge drop and my lights would get a little dim when the subs would hit but as soon as i hit the gas it was right back up where it needed to be you don't really need all the pulleys but the important one is the crank. you wont hurt you alternator or anything as soon as you hit the gas its fine.
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Old 12-04-2008
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Quote:
Originally Posted by ColdNapalm View Post
so then what you get less power right? but you still get more power then stock? so lets say you get 20 hp from the pully but when you put in the alternator pully you not get 10 but still that 10 more then stock? [using the hp numbers as examples]
Pretty much yeah. I think they alternator takes the least amount of energy to run so it probably won't be that much of a difference. Also you would need a new belt to run any of the pulleys.
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Old 12-04-2008
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Quote:
Originally Posted by Downey View Post
i don't understand what you asking with your numbers. ok the under drive crank pull slows the accessories down and at idle they will lag a little i have a 2000 watt system in my probe when i have one on that and at idle i could watch the gauge drop and my lights would get a little dim when the subs would hit but as soon as i hit the gas it was right back up where it needed to be you don't really need all the pulleys but the important one is the crank. you wont hurt you alternator or anything as soon as you hit the gas its fine.
Yeah but then your truck looks like a POS thats about to die when it does that. No thanks for me.
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Old 12-04-2008
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i've got a ton of offroad lights tho. so, i'll prolly get the one to bring the alternator up to stock performance.
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Old 12-04-2008
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Yeah but then your truck looks like a POS thats about to die when it does that. No thanks for me.
what do you mean its about to die
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Old 12-04-2008
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what do you mean its about to die
The pulley is $35. You would rather have dimming lights? No thanks it looks like ****.
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Old 12-04-2008
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I would go ahead and get the alt pulley as well, its not that expensive.
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Old 12-04-2008
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Quote:
Originally Posted by fddriver02 View Post
The pulley is $35. You would rather have dimming lights? No thanks it looks like ****.
My lights don't dim. If they dim everytime the subs hit I think that would look good.
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Old 12-04-2008
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Quote:
Originally Posted by vindex1963 View Post
My lights don't dim. Where have you seen that?
Right here:
Quote:
Originally Posted by Downey View Post
i don't understand what you asking with your numbers. ok the under drive crank pull slows the accessories down and at idle they will lag a little i have a 2000 watt system in my probe when i have one on that and at idle i could watch the gauge drop and my lights would get a little dim when the subs would hit but as soon as i hit the gas it was right back up where it needed to be you don't really need all the pulleys but the important one is the crank. you wont hurt you alternator or anything as soon as you hit the gas its fine.
I have seen some guys that have more system then engine and their lights dim even without an underdrive pulley. What I'm saying is buy it all together so you don't have that problem at all.
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  #21  
Old 12-04-2008
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getting the Alt pulley up front adds $35, alt pulley after the fact is gonna add more like $70 since you will need to change belts "again".
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Old 12-04-2008
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Originally Posted by graniteguy View Post
getting the Alt pulley up front adds $35, alt pulley after the fact is gonna add more like $70 since you will need to change belts "again".
But if I buy all the pulleys right now then I only have to pay for one belt right?
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  #23  
Old 12-04-2008
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correct. the two pulleys that effect the belt size are the alt pulley and the crank pulley. If you get those two upfront you can add other pulleys later without having to change the belt again.
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  #24  
Old 12-04-2008
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Quote:
Originally Posted by fddriver02 View Post
Pretty much yeah. I think they alternator takes the least amount of energy to run so it probably won't be that much of a difference. Also you would need a new belt to run any of the pulleys.
Our alts are going to pull ~3hp at peak current draw (95a).

You will only see a difference at idle, though. If you are cruising at 2krpm, even with the underdrives, your alt can still put out peak current.
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