can someone give me the scoop on underdrive pullies please! What they do and their gains.. maybe a price too if app.! Thanks!

 

Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels.

Jusnes & Troyer claim 10-15 RWHP + 1-2 MPG gain = $225

 

just installed a set of bbk underdrive pullies the other day on my 97 with a 4.6 definite throttle response n low end grunt increase. got a 20% discount so mine were 195 i know rpmoutlet.com has the for about 175 they are motoblue brand. would recommend very easy install

 

i got the asp pulleys for $100 on ebay great pulley, definite gain in power down low and in the mid range

 

well thanks guys! so what are the leading brands???

 

Those're the most common around these parts.

 

I'll throw in Summit u/d pullies.

 

thanks guys!! i went ahead and bought the pullies and new belt from troyer yesterday!! im at the beach right now so i hope they will be on my porch when i get home saturday

 

troyer pullies are ASP right? $100 on ebay doesn't sound bad.

 

idk, money grows on trees around my neck of the woods..not braggin or anything, but anyways.. so i got the pullies but noone around has the tool to take the fan off of a 2008.. should i just take it to the dealership and void my warrenty or just buy the tool and let the shop use it??
i then asked they guy at Louisiana Truck Outfitters if they had eFans and he said yes but he wouldnt be able to intal them cause they dont have the tool to take the stock fan off.. this is the lame b/s that i didnt want to run across...

 

i believe they are the same


arance, have you tried pepboys or autozone. they usually have loner tools. every autozone near me has the tool needed to pull the fan clutch off. if you wanted to be really ghetto, a pipe wrench will work. the "special tool" is nothing more then a large wrench for holding the water pump pulley in place while you break the nut loose. once its loose, you dont even need the special tool anymore

 

I don't know how different it might be, but don't the 08's have a different clutch fan with wires coming out of it, or something like that? I thought I saw a picture of one on here.

If it's not different,, then go to Autozone, and rent the kit for 20 bucks. As lucky said, it's basically a big wrench. When you're done, just return it, and they'll give you your money back.

 

Go to Auto Zone

 

yes the 08's have the electric fan clutch. they started that in 06 i believe. i have an 07 and the electric clutch still uses the same wrench kit. you just have to disconnect the wire before you pull the fan out. no big deal

 

I purchased some ud pullies for my 2002 f150 4.6L, and went to install them and the altanator pulley butted up against the altanator, so i didnt even try to put the rest of them on, then when i read on the box i noticed that it was an 8 rib pulley and my belt was a 6rib, would that be the reason it didnt fit? any help would be appreciated. thanks!