Educate me here... UDPs are just lighter? I thought they were sized a bit bigger to turn the accessories slower. Now I'm curious.
I'll probably not get them (have them on my 96GT as I got them free) because I don't want to swap them out later when I go FI.
Snack
you are correct that the the power advantages of the UDP's do not come from being lighter. they come from being different diameters. the drive pulley is smaller and the water pump pulley is bigger. A pulley is nothing more than a lever. the smaller the lever on the drive side means less power required to turn it. conversley, a bigger accessory pulley means less power to turn that.
I was fairly certain I felt a seat of the pants increase in acceleration when I had my UDP's on my car. but, I don't miss them since I put the stocks back on.
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2005 Mustang GT M5 -I reject your reality and substitute my own-
This all boils down to physics. I don't need a dyno to show me that slowing down parasitic drag on an engine reduces its load. Here is an example. I deal with electrical motors everyday. If you install a smaller drive pulley on a motor that is driving a device. The motor amp draw will decrease because it's work load has been reduced. The motor is now not working as hard, but its horsepower has not actually went up. This applies to a gasoline engine. The power that the motor is producing is is being transfered through the crankshaft. If a smaller pulley is installed on a crankshaft that is driving accessories, load on the motor decreases and more horsepower is freed up. The pulley has not added any horsepower at all to the motor, but will now allow more horsepower to be available elsewhere. The motor is now not working as hard to turn the accessories so there is more available horsepwer to the wheels in other words. I am not saying by any means that a ton of power has been freed up in the case of the 3v Mustang. It very well may only be a negligable amount, but the laws of physics still apply here. There is more horsepwer available to the wheels if the accessory load has been reduced. Like I said earlier in this thread, any hp that was freed up on my car, makes it worth it to me. It may not be to anybody else but that doesn't matter to me at all.
I have a Steeda UDP for like 3 weeks now. At the very beginnig it felt like the engine responds a bit quicker and during shifting the rpm drops a bit faster...don't know how to describe it better LOL
You just free up a few horses, you can't really feel it, maybe you see it on a dyno, don't know.
But there was a measurable improvement in gas mileage, not much but at least something you can measure
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Black 06 GT Convertible - 8.5x19'' 245/40 and 9.5x19'' 285/35 - 5 speed, 3.55 gears - Steeda CAI - Xcal3 93Oct tune - Steeda axleback system - Steeda UDP - Ceramic Coated Ford Racing Shorty Headers - Eibach Pro Kit Lowering Springs - Billet LCA's - adjustable UCA - Panhard Bar -G-Trac Brace - Double Strut Tower Brace - Tri Ax Shifter - Hood Pins -
I wish someone could perform a test on the water pump by itself to see the amount of power it takes to turn it from 0 - 6000 rpm using different pulley diameters. that is where the facts will come from. to many other factors come into play when testing the advantages of UDP's on a car when you are testing the whole car.
test different pulley diameters on a drive mechanism and the water pump and see how much HP it takes to keep that water pump turning through out the RPM range.
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2005 Mustang GT M5 -I reject your reality and substitute my own-
This all boils down to physics. I don't need a dyno to show me that slowing down parasitic drag on an engine reduces its load. Here is an example. I deal with electrical motors everyday. If you install a smaller drive pulley on a motor that is driving a device. The motor amp draw will decrease because it's work load has been reduced. The motor is now not working as hard, but its horsepower has not actually went up. This applies to a gasoline engine. The power that the motor is producing is is being transfered through the crankshaft. If a smaller pulley is installed on a crankshaft that is driving accessories, load on the motor decreases and more horsepower is freed up. The pulley has not added any horsepower at all to the motor, but will now allow more horsepower to be available elsewhere. The motor is now not working as hard to turn the accessories so there is more available horsepwer to the wheels in other words. I am not saying by any means that a ton of power has been freed up in the case of the 3v Mustang. It very well may only be a negligable amount, but the laws of physics still apply here. There is more horsepwer available to the wheels if the accessory load has been reduced. Like I said earlier in this thread, any hp that was freed up on my car, makes it worth it to me. It may not be to anybody else but that doesn't matter to me at all.
Have you ever run a dyno?
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Under Construction. Better, Stronger, Faster than it was before.
Nobody ever wants to admit a mod went wrong... Heck, I've done things wrong two or three times and not admitted it to myself.
i have a couple i question-
my exhaust sounds incredible from outside the car, inside? not so much.
my new stance- looks MUCH better, will look even better next summer with new wheels and wider rubber, but it rides like hell, and that 1000 miles a week? well...
my exhaust sounds incredible from outside the car, inside? not so much.
my new stance- looks MUCH better, will look even better next summer with new wheels and wider rubber, but it rides like hell, and that 1000 miles a week? well...
so i totally know what you mean.
I screwed up on my first exhaust setup. I bought a Basanni X pipe and installed it with Borla Stingers. Your teeth would rattle at 2000 rpms. I tried it without the cats, that only lasted one trip around the block. I had just spent a 1000.00 on Borlas and Basanni and I hated it. I then turned right around and had to spend another 1500.00 to get it the way I wanted it. That sucked, but I had to do it because I screwed up the first time. I'm not taking the underdrive pulleys off though!
I screwed up on my first exhaust setup. I bought a Basanni X pipe and installed it with Borla Stingers. Your teeth would rattle at 2000 rpms. I tried it without the cats, that only lasted one trip around the block. I had just spent a 1000.00 on Borlas and Basanni and I hated it. I had to spend another 1500.00 to get it the way I wanted it. That sucked, but I had to do it because I screwed up the first time. I'm not taking off the underdrives though. LOL
Have you ever run a dyno?
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Under Construction. Better, Stronger, Faster than it was before.
It is irrelevant as to whether I have run a dyno or not. I have stated nothing but facts concerning this. Like I said, IT ALL BOILS DOWN TO PHYSICS. Some, maybe only a very small amount, of power has to be freed up by slowing the accessories. That is all I am trying to say. If you don't believe it or have proven to yourself that its not true, that's fine. It doesn't really matter. I respect what you say even if I don't agree. I am not going to argue the point anymore. I'll run my underdrive pulleys and whatever else I want, its my car and my money, and you can run whatever you want based on your Dyno experience or whatever. We both will still be happy. In the end that is really all that matters. I just want to have fun and enjoy the Mustang hobby with others. I think that's what this forum is all about.
It is irrelevant as to whether I have run a dyno or not.
Not understanding the dyno process and how a dyno measures HP is irrelevant? Did you really just say that?
And if you are going to use physics to attempt to prove you point you need to include all the effects of physics, not just the ones that suit the outcome you are looking for. You have not taken into account the stored kinetic energy in the rotating components which have been partially taken away by spinning the accessories slower and using a lighter balancer.
If you are going to use physics as the basis for your argument you need to use all of its factors and prove it. That’s the nice thing about physics. It can be proven, so you have to. Until it is you may as well be basing your argument on potato salad.
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Under Construction. Better, Stronger, Faster than it was before.
You both realize, it`s a miniscule difference,and unless someone is looking for every little advantage to go that bit faster,does it really matter? We`re not pros,We`re just looking to have a good time.
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`06 Redfire GT Premium Coupe,398 Stroker,Whipple Supercharged,Comp Cams, Ford Racing CNC ported heads & throttle body,JBA longtubes,4:10`s with Eaton posi,Moser 31 spline axles,5R55S auto trans w/billet 3500 stall converter by Level Ten, TCI ratchet shifter,BMR K member ,A arms,trailing arms & drive shaft loop,aluminum drive shaft, ,BFG KDWS`s on Am Racing,CDC chin spoiler,Roush rear wing,custom roll bar by JW Racing & fabrication Shelton Conn, engine & tuning by Jannetty Racing Waterbury Conn.
You both realize, it`s a miniscule difference,and unless someone is looking for every little advantage to go that bit faster,does it really matter? We`re not pros,We`re just looking to have a good time.
Exactly my point. If there is a gain from a UDP it is so small that it would be almost impossible to measure. And if it can't be measured its a waste of moeny.
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Under Construction. Better, Stronger, Faster than it was before.
