why shouldn't you use UD pullies with a charger?

yellowstang1994 · Apr 7, 2005

My friend has a powerdyne with 11lb pulley on his GT and is also using underdrive pulleys with it. I heard somewhere that by doing this it might cut down significantally on how much boost he is pushing. I told him what I had heard and he said he doesn't know why it would effect anything. Does anyone know the deal and why? Thanks

Venom351R · Apr 7, 2005

W/ UD pully's everything spins slower, the ALT pully, the Crank Pully and the water pump pully. If you have a super charger that runs off the crank pully and its being underdriven by a UD pully then it will not spin as fast and not make as much boost.

davins130 · Apr 7, 2005

you could still keep your alt. and waterpump u/d pullies and just put the stock crank pully back on couldnt you?

SN95StangMan · Apr 7, 2005

I dont think a larger water pump pulley(underdrive) would fit with the stock crank pulley.

95snoozer · Apr 7, 2005

davins130 said:
you could still keep your alt. and waterpump u/d pullies and just put the stock crank pully back on couldnt you?

alternator

but for cooling purposes...why? you have a blower...

94Blue302GT · Apr 7, 2005

yeah, just use the other UD pullies and put the stock crank pulley on. Sell the UD crank pulley on ebay.

94Blue302GT · Apr 7, 2005

oh, and if it says that you have a 20% underdrive, then you prolly have 20% less boost, makeing that 11psi more like 8 or 9.

pwcracer · Apr 7, 2005

That will not work.. I just found this out the hard way last night! I have U/D pulleys on my 94, I am installing a KB supercharger so I tracked down a stock crank pulley (Not the easiest thing to do) I went to put it on last night, and the stupid thing hits the U/D water pump pulley and won't go on. I called Ford to order a stock h20 pulley and found out that they have been discontinued since 2003!
Try and find stock pulleys for 94-95, not easy

revhead347 · Apr 7, 2005

The rule really doesn't apply to our cars. On 94-95s, most blower kits use a seperate belt and a seperate pulley all together, so it doesn't really matter. 4.6s run the blower on the main serpentine belt, so you will underdrive the blower with underdrive pullies.

Kurt

pwcracer · Apr 8, 2005

It has to be getting the power somewhere, and if the crank pulley is running slower, wouldn't that inturn run the blower slower, and provide less boost? Thats why I am replacing my UD's with stock..

yellowstang1994 · Apr 8, 2005

My friend's powerdyne does have the seperate pulley on the crank for the charger. So I can see why now that it wouldn't matter about the underdrive pulleys or not. But while I am here let me ask. Sorry if this sounds stupid but... On U/D pulleys they are basically underdriving (bigger pulley) the alternator and water pump to overdrive the crank (smaller pulley)? Is that correct or am I messed up?

MysteryMachine · Apr 8, 2005

pwcracer said:
That will not work.. I just found this out the hard way last night! I have U/D pulleys on my 94, I am installing a KB supercharger so I tracked down a stock crank pulley (Not the easiest thing to do) I went to put it on last night, and the stupid thing hits the U/D water pump pulley and won't go on. I called Ford to order a stock h20 pulley and found out that they have been discontinued since 2003!
Try and find stock pulleys for 94-95, not easy

I have all my stock pulleys if ya need them make me a deal

cavscout371 · Apr 8, 2005

pwcracer said:
That will not work.. I just found this out the hard way last night! I have U/D pulleys on my 94, I am installing a KB supercharger so I tracked down a stock crank pulley (Not the easiest thing to do) I went to put it on last night, and the stupid thing hits the U/D water pump pulley and won't go on. I called Ford to order a stock h20 pulley and found out that they have been discontinued since 2003!
Try and find stock pulleys for 94-95, not easy

thats good to know I'll have to save mine when I do the pullies

SN95StangMan · Apr 9, 2005

yellowstang1994 said:
My friend's powerdyne does have the seperate pulley on the crank for the charger. So I can see why now that it wouldn't matter about the underdrive pulleys or not. But while I am here let me ask. Sorry if this sounds stupid but... On U/D pulleys they are basically underdriving (bigger pulley) the alternator and water pump to overdrive the crank (smaller pulley)? Is that correct or am I messed up?

That's right. smaller crank pulley. larger accessory pullies.

why shouldn't you use UD pullies with a charger?

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Apparently my ex-husband made that mistake.

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