3G alternator swap

[Rick James]

Which pulley did you guys use?the alternator i bought has a bigger pulley,buying a new belt is easy but is the pulley size going to affect how it performs?thanks

 

[Chuckman]

i just used the pulley that came with it, been working fine for me for about 3 years.

 

[HISSIN50]

And to comment on performance, one would probably need to know what your electrical requirements at idle are, what amperage 130 alt you have, if you have U/D's, where your hot idle is set, etc.

I've run 3G's with the stock pulley and overdriven. I prefer the latter, esp since I dont tach the car up (you dont want to see more than about 15K alt RPM).

 

[Rick James]

I have the stock pulleys on the car now and it idles about 900rpm(carb),i have a external mallory fuel pump,msd 6al and i rev it the most to 6 grand.I am soon going to do a electric fan,thats why i am doing the upgrade.The alternator is from a 96 v-6.Does anybody know if 4 gauge battery cable okay to use?i bought a 7 foot piece today for $12 and i am picking up a 150 amp fuse and holder in the morning.It sucks at night coming from the track which is atleast 30 miles from my house ,hoping my battery will make it home.lol

 

[Foxfan88]

i use a new parts store alternator for a 95 mustang, they cam factory with 130A alternators.

the pulley sizes from my stock one to the 130A looked the same (close enough i didnt pay it any bother)

the new alternator puts out so much more current i doubt the pulley size would even matter honestly..

 

[HISSIN50]

Foxfan's advice sounds pretty good to me.

If there is an issue, because your set-up isnt stock, I'd just crunch numbers to make sure you dont go past the alt's critical speed (crank and alt pulley relationship with regard to 6000 engine RPM).

Crank pulley/alt pulley * engine RPM = alt RPM

 

[Rick James]

Thanks guys,i will let you know how i make out.