Under Drive pullies

[89CobraGT]

hey... So I was going to install my underdrive pullies but I'm thinking I'm gonna have some charging issues with my electric fan and stereo it pulls alot of power. I was wondering if I can just install the pully for my water pump and crank.. Will my car still run ok even though the pullys dont match I also have power steering but Ive never seen a pully for that... anways any input would be apperciated..
thanks

 

[Bullitt347]

You can run just 1 of the underdrive's if you would like. It depends on whose pulleys you use. I believe Auto Specialties makes an underdrive P/S pulley.

 

[89CobraGT]

soo I can run my crank pully and my waterpump pully?? I'll have t look for the p/s one thanks!!

 

[AnthonyR23]

I would suggest upgrading to new 130amp 3g alternator.. with a overdrive pulley.. if you can't do the alt. upgrade at least get a overdrive pulley for your old one.. mine was about 18.95.

 

[04sleeper]

The best setup for the street that I have found is the 4" underdrive crank pulley, stock water pump pulley and 1 7/8 overdrive alternator pulley.

I do suggest running the 130amp alternator like mentioned.

A good place to source the alternator pulley is here. http://rjminjectiontech.com/?p=7

 

[PJB]

I used the underdrive waterpump and crank pullies but still had issues with charging when using the underdrive pulley on the alternator even though I upgraded to a 130 amp '94 Mustang GT alternator.
I ended up putting my stock '92 alternator pulley on the higher output alternator.

BTW the fox underdrive alternator pulley is the same size as the SN95 130 alternator amp pulley.

 

[89CobraGT]

I have a 100 amp alternator it works pretty good I just wanted to know if I could keep the stock pully alternator pully thanx

 

[AnthonyR23]

Well if you decide to get a high powered amp or electric fan and you notice that your voltage is too low... remember that overdrive pulley... it's pretty tiny... I'll send a pic...

 

[PJB]

Basically putting the stock alternator pulley on the higher output alternator is overdriving it since the stock pulley is smaller.