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Old 09-17-2012, 09:43 PM   #1
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Opinions on underdrive pulleys?

How do you folk feel about underdrive pulley's? I just have the underdrive crank pulley and just took it off. I feel a difference but also feels like it hard on things. Seems to be real tight. Just put on my stock crank pulley tonight and feels loser. Want to know your guys thought.
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Old 09-17-2012, 10:14 PM   #2
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Under drive pulleys IMO are a waste, I has my car dynoed a few months ago and the guy at the speed shop recommended me to switch back to stock pulleys ! Under drive pulleys just cause annoying issues on 94-95 5.0s
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Old 09-17-2012, 10:41 PM   #3
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I had under drive pullies and was having cooling and voltage issues. I switched back to my stock pullies and bam the issues web away.
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Old 09-17-2012, 10:43 PM   #4
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Quote:
Originally Posted by 88stang5.0
I had under drive pullies and was having cooling and voltage issues. I switched back to my stock pullies and bam the issues web away.
I am having those exact issues right now... Going back to stock pulleys asap.
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Old 09-17-2012, 11:25 PM   #5
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Good idea!!
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Old 09-18-2012, 04:00 AM   #6
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Too many problems with under drive pulleys. Go back to the stock ones.
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Old 09-18-2012, 06:24 AM   #7
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Quote:
Originally Posted by WhiteCobra94
Under drive pulleys IMO are a waste, I has my car dynoed a few months ago and the guy at the speed shop recommended me to switch back to stock pulleys ! Under drive pulleys just cause annoying issues on 94-95 5.0s
+1

Don't do it!

---------- Post added at 06:24 AM ---------- Previous post was at 06:23 AM ----------

Quote:
Originally Posted by Matt95GT

I am having those exact issues right now... Going back to stock pulleys asap.
+2

---------- Post added at 06:24 AM ---------- Previous post was at 06:24 AM ----------

Quote:
Originally Posted by Jeff44
Too many problems with under drive pulleys. Go back to the stock ones.
+3
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Old 09-18-2012, 12:55 PM   #8
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Re: Underdrive pulleys?

They are a cheaper way to get a little extra power, but the potential issues you can have just aren't worth it. for the same money you can get more reliable parts in other areas.
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Old 09-18-2012, 01:56 PM   #9
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Underdrive pulleys will give you a few extra horses, but as many people find out there are consequences to downsizing the pulleys. If your Mustang is a daily driver, or is driven frequently in stop and go traffic, then stick with the stock pulleys. You should also consider sticking with stock pulleys if you have high amperage demands, like a high wattage stereo system. If you drive your car occasionally; car shows, cruise nights and trips to the track, then underdrive pulleys can work. You should get a larger Alt, say 130-140 Amps, and expect to set your idle higher.
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Old 09-18-2012, 04:17 PM   #10
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I agree with you all. Just wanted to know if everyone else felt the same. My friend had it on his early 90's fox and has trouble with amps and batterie. I think there hard on your motor.
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Old 09-18-2012, 04:20 PM   #11
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Quote:
Originally Posted by Sybesma07
I agree with you all. Just wanted to know if everyone else felt the same. My friend had it on his early 90's fox and has trouble with amps and batterie. I think there hard on your motor.
they arent hard on the motor. they just dont rotate the accesories at the proper rpm.
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Old 09-18-2012, 08:17 PM   #12
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I have underdrives wit no probs
DD throughout chi-town weather!
So pfffffff!!!..but I don't have a/c or radio junk stealing my mojo either.
But I will say during heavy rain with the wipers on high unless I'm over 1,200 rpm they run slow and the lights dim quite a bit :/
All I'd have to change back is the alt pulley back to stock, but it's made it through 2 winters and the batt still runs strong.
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Old 09-18-2012, 08:20 PM   #13
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I have underdrives wit no probs
DD throughout chi-town weather!
So pfffffff!!!..but I don't have a/c or radio junk stealing my mojo either.
But I will say during heavy rain with the wipers on high unless I'm over 1,200 rpm they run slow and the lights dim quite a bit :/
All I'd have to change back is the alt pulley back to stock, but it's made it through 2 winters and the batt still runs strong.
and change the crank pulley back to stock. the crank pulley kills mojo to.
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Old 09-18-2012, 08:33 PM   #14
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Quote:
Originally Posted by dreamstang

and change the crank pulley back to stock. the crank pulley kills mojo to.
I understand that underdrives everything sunshine. when I first did my underdrive setup I didn't change the alt pulley and had no issues with the wipers runnin or the bat charging. After no issues I did the alt. Sooo if I didn't want slow wiper jazz I would only change the alt pulley to stock. Nah nah nah boo boo stick yr head in doo doo!!
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Old 09-18-2012, 08:38 PM   #15
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Originally Posted by XXSTEVEO66

I understand that underdrives everything sunshine. when I first did my underdrive setup I didn't change the alt pulley and had no issues with the wipers runnin or the bat charging. After no issues I did the alt. Sooo if I didn't want slow wiper jazz I would only change the alt pulley to stock. Nah nah nah boo boo stick yr head in doo doo!!
whateva
wellllll...... most people dont have luck with just changing the alternator pulley back. so blah blah. haha but anyways i have an UD crank pulley. but what i did was overdrive the alternator to basically make it back to stock rpms. the reason i did that was cause i didnt have the stock pulleys, and the brand new aluminum pulleys did look kimda sexy.
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Old 09-18-2012, 08:42 PM   #16
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Originally Posted by dreamstang

whateva
wellllll...... most people dont have luck with just changing the alternator pulley back. so blah blah. haha but anyways i have an UD crank pulley. but what i did was overdrive the alternator to basically make it back to stock rpms. the reason i did that was cause i didnt have the stock pulleys, and the brand new aluminum pulleys did look kimda sexy.
+5.0 on da sex appeal!..
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Old 09-19-2012, 01:14 AM   #17
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Quote:
Originally Posted by XXSTEVEO66
I have underdrives wit no probs
DD throughout chi-town weather!
So pfffffff!!!..but I don't have a/c or radio junk stealing my mojo either.
But I will say during heavy rain with the wipers on high unless I'm over 1,200 rpm they run slow and the lights dim quite a bit :/
All I'd have to change back is the alt pulley back to stock, but it's made it through 2 winters and the batt still runs strong.
Im from illinois, (joliet) too! Never again will I drive my fox through the winter. Did it ONCE lol. I had a bad experience.You go up to 66 ?
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Old 09-19-2012, 05:47 AM   #18
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Originally Posted by foxbox

Im from illinois, (joliet) too! Never again will I drive my fox through the winter. Did it ONCE lol. I had a bad experience.You go up to 66 ?
I drive by 66 every day going to work. My work is about 5min from the track. I haven't been there in a while though ..I'm right up the street from you in Lockport.
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