Underdrive Pullies
#22
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
#23
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.
#25
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,390
Likes: 2,293
From: Carnegie, PA
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..
#26
+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.
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.
#28
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
I'm so addicted to modding though that I'll probably end up with them on my car at some point anyway though. lol
#29
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.
Maybe it was the weight loss of $200 from my wallet that translated into a faster car...
#30
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.
#32
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.
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.
#34
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,390
Likes: 2,293
From: Carnegie, PA
+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.
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.
#36
Give me a call if you have absolutely any questions!
CR
#37
SUPERCHARGED RED ROCKET ------------------Master-Moderator
Joined: May 11, 2006
Posts: 10,390
Likes: 2,293
From: Carnegie, PA
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..
#38
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..