my thought rumble about the similarity and difference between both alternators... how much more amps does the cosmos put down? or are they both the same...

 

Don't quote me as Im not sure, but Ive been told that the cosmo and fd alternator's are the same. I am running a cosmo alt on my fc but I have never tested the amp's. It looks identical to the fd alt.

 

are you using double pulley? got pics because i got a cosmos alt and want to swap

 

heres the difference between rx-7 alternators..
S3 = 60 amp peak
S4 = 70 amp peak
S5 = 80 amp peak
S6 = 100 amp peak
S7 = 120 amp peak

im not too sure about the cosmos
but i think its around 90-100

 

are they plug and play?

 

Silverrotor used to mod the S5 alts to work on a S4 car as a plug and play unit. He no longer offers this service though. If there are differences between the s4 and s5 unit i would say that there are similar differences in the s5 to s6 alts as well.

 

hmmm. because i can pick up an fd alternator easily and i wanted to shove it into my s5 fc.

 

ok today i swap everything went through the wiring and the alt did not charge... any word or something i should be aware of??? its in my s5 t2