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Old 07-05-2014, 12:37 PM   #1
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Under drive pulleys for gt

I'm stuck on the fence about getting these I've heard great results and also horror stories my gt is not my daily driver but I want it to be reliable as one give me advice to help me decide !


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Old 07-05-2014, 01:30 PM   #2
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Steeda udp and never look back


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Old 07-05-2014, 01:37 PM   #3
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Steeda was developed with ford racing if I recall and replaces the alternator pulley water pump pulley and crank pulley. Other companies sells there's cheaper because they're a piggy back system that still reuses the crank pulley for harmonic balancing and if not installed right can have issues down the road because of this. Steeda does not, they replace the entire crank pulley it's self for a better product and longevity.

Hope this helps! Not trying to scare you from other brands but like a lot of people say better spend the extra money and do it right the first time and save your self the cash and headache now then later.


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Old 07-05-2014, 01:54 PM   #4
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Steeda for sure.


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Old 07-05-2014, 01:56 PM   #5
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As in general with Under Drive Pulleys (UDP) they reduce parasitic drag running accessories on your engine. In this case the crank pulley, water pump pulley, and alternator pulley which in turn gives you rwhp back. The way I was told lets say your engine makes 300HP but you put it on a dyno and it only makes 260 at the wheels. Your accessories, transmission, drive shaft, and differential all take power to turn them and in turn make the car move which causes the power to the rear tires to be less then that at the engine. Well by adding the pulleys your engine hasn't gone up in HP but is now running more efficient. Your car is still making 300 hp at the engine but your now getting 270 hp to the wheels because of this. As some people say you'll also be able to get through the RPM's at a faster rate as well because of these.


If I missed any thing or got some thing wrong I'm sure some one will correct me. hope this sheds some light on how these work and increase performance on your mustang.
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Old 07-05-2014, 02:04 PM   #6
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I heard they make the car stall at idle


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Old 07-05-2014, 02:07 PM   #7
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With like ac on and accessories


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Old 07-05-2014, 02:24 PM   #8
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Haven't heard of that one yet but some one that has had them for awhile might be able to tell you if they've ever run into issues after installing them


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Old 07-05-2014, 02:54 PM   #9
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So I think I'll get udp the steeda ones


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Old 07-05-2014, 03:08 PM   #10
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Never heard of people stalling either. Heard people had Alternator problems though.


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Old 07-05-2014, 03:17 PM   #11
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Never heard of people stalling either. Heard people had Alternator problems though.


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Like the battery not charging ?


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Old 07-05-2014, 03:37 PM   #12
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Like the battery not charging ?
No, just not at the same rate due to the pulley change. A higher amp Alt will compensate for this.

My Alt went out on me last summer, so i went to a 170amp one because one day a set of UDP was getting installed. "One Day" seems to take for frikkin ever...
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Old 07-05-2014, 04:36 PM   #13
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So if I get the udp I have to get a better alt?


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Old 07-05-2014, 07:19 PM   #14
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You shouldn't need a new alternator


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Old 07-05-2014, 07:25 PM   #15
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I hope not


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Old 07-05-2014, 09:25 PM   #16
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I've got steeda UDP's on my new edge. They've been on there since 06' and I've never ever had an issue with them. Still have the original alternator on her as well. Some say you can leave the stock alt pulley alone anyways. Its not going to make a difference. And don't expect to have that "seat of the pants" difference with them either
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Old 07-05-2014, 11:32 PM   #17
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I've got steeda UDP's on my new edge. They've been on there since 06' and I've never ever had an issue with them. Still have the original alternator on her as well. Some say you can leave the stock alt pulley alone anyways. Its not going to make a difference. And don't expect to have that "seat of the pants" difference with them either

Roughestang,
How much RWHP are you pushing? I keep blowing my alternators. Am on my 2nd a almost 3rd. Am pushing 283RWHP NA. don't make sense. Still using the Steeda UDP original on my alt. think i need to upgrade to 200amps? Thinking bout it.
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Old 07-05-2014, 11:37 PM   #18
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Might help to say that I'm using 2004 production heads (PI) with kick in the pants mods. I've surpassed then 260 crank HP by about 100 to 130 on a good day, but stable at 350 at the crank. I think is more though.
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Old 07-05-2014, 11:39 PM   #19
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Anyways, am burning up alternators for no good reason. Looks like my alt is over charging last check today; 15volts. 14 at idle. Give it gas and it jumps into the red. Wondered I'd I misplaced the actual UDP pulley but looks like the right one.
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Old 07-06-2014, 08:39 AM   #20
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So bottom line should I get them I drive my car only weekends and nice days to car shows but I want it reliable as a dd also


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Old 07-06-2014, 12:21 PM   #21
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It's up to you. I plan to get Steeda UDP eventually.


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Old 07-06-2014, 01:07 PM   #22
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Don't think they will affect reliability.. But I wouldn't pay the cash for them. I'd put it towards somethin else that you'll really feel.
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Old 07-06-2014, 05:37 PM   #23
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Don't think they will affect reliability.. But I wouldn't pay the cash for them. I'd put it towards somethin else that you'll really feel.

Like what they gain 10rwhp for 200 that's not too bad


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Old 07-06-2014, 07:00 PM   #24
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So if I get the udp I have to get a better alt?


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No. Your alt should already be the 130 amp alt. Only the Fox body stangs, because they are only putting out about 65 to 70 amps should be upgraded.
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Old 07-07-2014, 01:31 AM   #25
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Roughestang,
How much RWHP are you pushing? I keep blowing my alternators. Am on my 2nd a almost 3rd. Am pushing 283RWHP NA. don't make sense. Still using the Steeda UDP original on my alt. think i need to upgrade to 200amps? Thinking bout it.
I have no idea. Never had her dynoed. I've got just about every bolt on, full exhaust, suspension, and gears. But for a N/A those numbers sound pretty good.




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Might help to say that I'm using 2004 production heads (PI) with kick in the pants mods. I've surpassed then 260 crank HP by about 100 to 130 on a good day, but stable at 350 at the crank. I think is more though.
At the crank, but 280ish at the wheels isn't bad at all. A set of tfw heads would get you over 300.






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Anyways, am burning up alternators for no good reason. Looks like my alt is over charging last check today; 15volts. 14 at idle. Give it gas and it jumps into the red. Wondered I'd I misplaced the actual UDP pulley but looks like the right one.
It sounds more of an electrical issue. I'd check the grounds and see if there is a short or something.
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Old 07-09-2014, 06:22 PM   #26
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Check out my new post my car started making a werid whistle noise I need help


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Old 08-26-2014, 09:19 PM   #27
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I have no idea. Never had her dynoed. I've got just about every bolt on, full exhaust, suspension, and gears. But for a N/A those numbers sound pretty good.





At the crank, but 280ish at the wheels isn't bad at all. A set of tfw heads would get you over 300.








It sounds more of an electrical issue. I'd check the grounds and see if there is a short or something.

grounds were ok. Went to auto zone and had em hook up the batt tester and test the alternator; the regulator failed. I bought a new one. It's just a matter of time before this regulator goes tits up too. I'm gonna upgrade to a high performance model soon as I can afford the $300 cost.


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Old 08-27-2014, 12:14 AM   #28
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steeda udp are on sale on lmr rite now for 191 free shipping. I ordered some, cant wait!
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