U/D Crank Pulley Only....

[muckstang]

Hey Guys, Does anyone run with just an underdrive crankshaft pulley (with the remaining ones stock)? Is there much HP gain? If so, how much? Will I need a shorter belt or will I be able to adjust the tensioner enough to compensate for it?

The only reason that I am asking is because I do not want to change the alt. pulley because of charging issues I have read about since I have an aftermarket radio with subs. Just trying to figure out if it makes sense to buy the complete 3 piece kit and only use 2 of them or just purchase the one pulley.

Thanks for all the imput.

 

[94Blue302GT]

First, Search, it's in here somewhere.
Second, yeah, you can do it, but it will still slightly underpower your alt. Getting a Smaller pully for your Alt might be possible, but i don't know where you could get it.

 

[Suspect]

i run bbk pullies. i used the crank and wp with stock belt. would have put the alt on, but couldnt get it off, needed power tools. theyve been like that over a year and its fine.

 

[8950HO]

www.aspracing.com has the smaller 1-7/8" alternator pulleys.
I believe they also sell the 3 piece pulley kit with the 1-7/8" alternator pulley included as an option.

 

[95cobraguy]

instead of running just the crank pulley just leave it stock and save yourself any headaches. what r u gonna gain with just the crank pulley, 2hp, if that.

 

[muckstang]

If the crank is truly only worth a couple HP, I will either do all three or not at all.

 

[urban96]

do the crank and wp

 

[CManT1914]

I gained a noticeable hp increase and a solid tenth or better with my pullies. I then took my alternator pulley off (charging issues) in favor of the stocker, and had a noticeable loss of power. But now I have a 200amp alternator, so I put my u/d's back on.

Maybe if you can get them used then do it. Otherwise skip them for now.