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i just wanted to get an idea of how much power one inherits from adding on a new UDP and is it worth the money to those who have purchased and installed on their vehicle.
thank you
jorsh
 

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Well, if you want Duratec UDP's, good luck. SHOShop made some a while back, but they're very rare anymore. The only person I know that has them is Venom.
As for the Vulcans, well, there just aren't any. There are some for the Rangers, but I don't think they'll fit.
 

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I installed a set of UDP on my 1991 SHO. The claim is for about 5-8hp all across the rpm range. The main benefit I wanted was longer life on the accessories and 8000+ rpm rev limit. I am sure if you pulled the pulleys off your alternator, water pump and power steering you can find some one to machine smaller pulleys for you.

Bob
 

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What the hell is a UDP?
 

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Under Drive Pulley---makes the belt-driven accessories run slower, freeing up more power. In the high-revving Yamaha motors, it also helps prolong the life of the accessories, since they'll fail in the upper RPM's way before the engine does.

-Rob
 

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so it's a larger pulley wheel, or what?

If the only draw back is that my heater blower runs a little slower, I'm hip. What do I need?
 

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Originally posted by DeltarMN@Oct 11 2004, 09:39 PM
Jorsh, search is your friend. Use it.

I dynod a SHOshop UDP at +10whp +9wTRQ.
No ****? You got a dyno chart or something? That's about double than what I was expecting on a dura. Nice gains.
 

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When I have another car, I'd like to start modding the engine on the Sable...and UDPs sound like they'd be a really good idea!

JR
 
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