U/D's are good for 4-10rwhp/tq typically.... A gain is a gain.

Would it be my first mod? No, but it would be one if I was staying N/A. There was a noticeable difference in throttle response. In a straightline the butt-meter couldn't notice, but racing folks the additional power showed slightly.

Fact of the matter is, two identical trucks, one with U/D pulleys and one with not.. The one with U/D pulley will be faster.

 

soo your saying that i dont know a thing or two about hp? well then i guess you must have me beat, i mean all i know is just from me racing since i was 5 years old, im now a senior at ASU for mechanical engineering with a concentration in automotive, if you want ill calculate the exact theoretical hp change that you will see by calculating the force it would take to turn all the accessories in both stock and with ud pulleys. so how are you more qualified then me to say you know a thing or two about hp?

my pulleys were not $200 i bought them used off a friend who sold his truck. every little gain is a gain no matter how little, and if that is what i want that is what ill do. so unless you have installed pulleys on your truck you really have no idea

on your 10 second mustang does it have ac? or power steering?

 

Price per hp/tq/rotational mass gain is great. Even if you gain 5hp thats $40 per horse.....not bad!

I paid $300 for a aluminum flywheel and $300 for an aluminum drive shaft on my Cobra for no horsepower gain....just less rotational mass....think about it....a gain is a gain.....when you start adding them all up you can feel much more than nothing (as you are saying).

I have all bolt on's on my Cobra......when from 270RWHP and 265RWTQ and 13.8 at 102mph to 300RWHP and 295RWTQ and 13.0 at 106mph. And yes, I felt a difference with the UD pulleys as it was my second bolt-on.

 

a $5000 supercharger will gain about 100hp so thats about $50 per hp....

 

If a $5000 supercharger only gains you a 100hp then something is wrong lol.

 

I put the troyer pulleys with the gatorback belt. I could feel it. When i really felt it was when i put the aem intake and sct programmer with the vmp tune for the pulleys. They make a difference. I would recommend it.

 

No, the truck with the LIGHTER driver will be faster.

And when it comes down to UDP as the only difference between two like vehicles, and said vehicles are massive TRUCKs, other factors would make MORE of a diff in determining the "faster" of the two.

Things as trivial as how much fuel is in the tank, who is the fatter driver, who has quicker reaction time, who has better 60ft times.....those would make more of a diff than UDP.

 

Real world application.

http://www.cardomain.com/ride/3131345

BTW, I'm an EE so I know some stuff too. Again, I refer you to the above link for my real-world racing knowledge/experience.........

Thanks for your current resume BTW. I'm surprised that you don't see the lack of logic in installing UDP's an such a large mass.....

 

No, what I was saying (please re-read my posts) is that UDP are not worth the expense. Now, If you got those UDP's used for $50 bux, then that's a good deal and "worth" the expense......

I never once said that "adding" all the little bolt-ons was not noticeable. I'm simply saying that the expense incurred via the purchase of UDP's is definitely not worth the infinitesimal gain they provide, and this is compounded when putting them on a TRUCK.....

On a stock 3500lb Mustang, they might be noticeable, but still not worth it, again, unless purchased used.

 

ok here is my real world application

 

It's rather obvious that those that have installed UDP's on their trucks feel compelled to vindicate their cash loss.....


If one has over $200 to spend on a performance mod, get a tuner.

 

So, which UDP's did you install on THAT truck......bet it was a night-n-day difference. Oy.



Nice truck BTW

 

Did I enter a pissing contest unknowingly?

 

on THAT race truck it doesnt have ac and the alternator and power steering have the optimal pulleys for them to work properly with the smallest power loss....

 

WOW with all those stickers that thing must be up in the 1,000 hp range!, lol forget the pullies and just toss on another decal! just messin. I have heard if two cars 1 with and 1 without the UD pullies were running full out and when the car with UD's pulled ahead when the headlights were turned on... I guess thats due to the drag the alt puts on the motor when charging...but I've also heard that some who change all the pulies have charging issues later... that must be why as stated above the stock pully was left on the alt and the rest were changed...but wouldn't it have the same effect on the wwater pump..spinning slower... does that help or hinder the engine/water pump life?