GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Underdrive Pullies

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Old 4/28/07 | 03:40 PM
  #21  
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I just received mine direct from Steeda for $191.30 shipped
Old 4/29/07 | 11:34 PM
  #22  
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I got my car dynoed three days ago, and while I was there I had them install some pullies that I never got around to putting in. Before and after dyno results, they netted me 3 HP. Pretty unimpressive, however, the car does get up and GO Definite notice by my Left Cheek and Right Cheek. Now, I don't know if pullies on a stock car would gain a couple more ponies or not, as I have LTs, o/r X, Demolet intake and delete plates. My tune is one of Dougs specialties, and it did not have to be modified at all
Old 4/30/07 | 01:30 AM
  #23  
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I have been sitting on the fence on the subject of UDPs for a while. That last post confirmed my suspicions. Three lousy hp for approx. $200 and a sore back is not a good hp per dollar value. Expecially when you factor in the pain in the *** of removing the balancer. I'm getting the Steeda econo delete plates instead. Easier to install than UDPs for a bigger gain for less money.
Old 4/30/07 | 01:44 AM
  #24  
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yeah i see a Whipple in my cars future so i am not going to spend $200+ for some pullies that only get 2-5hp then i have to remove them for the whipple
Old 4/30/07 | 04:32 AM
  #25  
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There's also another advantage, UD pulleys also extend the lifespan of the water pump, A/C condenser and power steering pump by reducing accessory drag..
Old 4/30/07 | 07:48 AM
  #26  
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+1 Rocky.
IMO, the benefit of UDPs is LEAST noticed in HP#s on a dyno. Kinda like a lightweight drive shaft. On a dyno, you are not measuring acceleration, or how fast your car revs up directly. Your just looking for a peak HP/TQ number. The real benefit of pulleys (and a D/S) is in the reduction of rotating mass the engine has to turn. Once all of that stuff is up to speed, then there is less of difference in how much add'l power the engine has to commit to turning all of this stuff. That reduction in the power needed to spin up accessories will increase accerleration and allow the engine to rev quicker (all while reducing stresses on the engine and driven accessories.

So there is more benefit, than just peak HP #s on a dyno, to UDPs.
Old 4/30/07 | 07:59 AM
  #27  
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Has anyone used the Powerbond pulley?
Old 4/30/07 | 11:32 AM
  #28  
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Hearing an actual dyno number, 3 RWHP, after installation of the UDP's, really makes them seem not very worth the $200 they cost or the PITA installation. I know that some people say that there is more to them, that they really make the car "feel" different, but I personally believe those people to be experiencing some kind of automotive placebo effect. I didn't feel a difference from a UDP in either of my previous 2 cars, which both advertised a 5-8 HP gain, and had dyno numbers backing it up. Right now, I'm with 281GT: My next performance mod will be the Steeda CMCV delete plates, since they are cheaper, easier to install, and make more horsepower. Seems like a no-brainer to me if you're making the choice between those two.

I'm so addicted to modding though that I'll probably end up with them on my car at some point anyway though. lol
Old 4/30/07 | 11:53 AM
  #29  
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Originally Posted by titanjc
Hearing an actual dyno number, 3 RWHP, after installation of the UDP's, really makes them seem not very worth the $200 they cost or the PITA installation. I know that some people say that there is more to them, that they really make the car "feel" different, but I personally believe those people to be experiencing some kind of automotive placebo effect.
Hahahah! So I am *not* a heretic after all for saying I didn't feel any difference other than a lighter wallet!

Maybe it was the weight loss of $200 from my wallet that translated into a faster car...
Old 4/30/07 | 12:02 PM
  #30  
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Originally Posted by mrkabc
Hahahah! So I am *not* a heretic after all for saying I didn't feel any difference other than a lighter wallet!

Maybe it was the weight loss of $200 from my wallet that translated into a faster car...
LOL No I completely agree with you. Before I installed the UDP on my 350Z (my last car), all I heard on the forums was "these are SOOO great, makes the car rev faster, feel better, definitely noticable on the butt dyno, etc...". I installed them, took the car for a ride, and was wondering if I got the wrong part. Couldn't feel them at all, and I felt like I wasted $200. Now I don't know how it would be on a Mustang, but that was my experience on that particular car.
Old 4/30/07 | 07:44 PM
  #31  
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I'm passing on them too as I am eventually going to Whipple-up. I'm just doing the CMCV and CAI/tune. I'll get more engine flexibility from an aluminum DS.
Old 4/30/07 | 09:01 PM
  #32  
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I have been doing some research on this and the pulleys seem to be a good mod. I was told to forget the charge motion delete plates unless you spend lots of time at the drag strip.

I am going to do pulleys 1st and then save my money for a drive shaft. Eliminating rotating mass is a good thing from what I can tell.

obviously there are lots opinions on different mods and some people will swear by one mod and others think it sucks.
Old 4/30/07 | 09:52 PM
  #33  
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for me my next performance mod is going to be either a DS from Tillman or some CMCV, anyone ever find out what happened to the FRPP ones
Old 4/30/07 | 09:56 PM
  #34  
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Originally Posted by Lowe!
+1 Rocky.
IMO, the benefit of UDPs is LEAST noticed in HP#s on a dyno. Kinda like a lightweight drive shaft. On a dyno, you are not measuring acceleration, or how fast your car revs up directly. Your just looking for a peak HP/TQ number. The real benefit of pulleys (and a D/S) is in the reduction of rotating mass the engine has to turn. Once all of that stuff is up to speed, then there is less of difference in how much add'l power the engine has to commit to turning all of this stuff. That reduction in the power needed to spin up accessories will increase accerleration and allow the engine to rev quicker (all while reducing stresses on the engine and driven accessories.

So there is more benefit, than just peak HP #s on a dyno, to UDPs.
+10 Jim. In fact my main priority is reducing as much airflow restriction and engine stress as possible in which the UDP's accomplish this by reducing the power required to spin the accessories such as the power steering unit, water pump, A/C compressor and alternator while at the same time extending the life of both the engine and power driven accessories..All in all, I'd say there's definitely far more benefit to UDP's than just peak HP#'s on a dyno IMHO
Old 4/30/07 | 09:58 PM
  #35  
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You're slowing down the water pump. That's bad imo. The pulleys are a specific size for a reason.
Old 4/30/07 | 10:19 PM
  #36  
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Originally Posted by RedDragon777
for me my next performance mod is going to be either a DS from Tillman or some CMCV, anyone ever find out what happened to the FRPP ones
Steeda sells their plates with the FRPP casting number and part number still on them. Steeda had the patent, and yanked em from Ford and sold them direct to make more money than selling them to Ford at wholesale costs. Kudos to them for cornering the patent.... good chess move. Cheesy price hike, though.

Give me a call if you have absolutely any questions!

CR
Old 4/30/07 | 10:20 PM
  #37  
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You're slowing down the accessories by only 25% Chris ! which really has no affect on the water pump itself, in which there have been absolutely no cooling issues nor problems whatsoever.. and the real advantage of the Steeda pulleys are ? their designed and engineered to Ford specifications as a direct result of their partnership in Ford's technology transfer program and are therefore completely safe..
Old 5/1/07 | 07:12 PM
  #38  
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Originally Posted by m05fastbackGT
You're slowing down the accessories by only 25% Chris which really has no affect on the water pump itself in which there have been absolutely no cooling issues nor problems whatsoever and the real advantage of the Steeda pulleys are their designed and engineered to Ford specifications as a direct result of their partnership in Ford's technology transfer program and are therefore completely safe..
yay for run-on sentences!
Old 5/1/07 | 07:19 PM
  #39  
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Anyone got a belt routing diagram?
Old 5/1/07 | 07:29 PM
  #40  
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Try this:
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