Just checked the alternator that came on my jspec t2 motor and it says 70 Amp?

 

lol....listen to what I'm saying...there are minor differences in all the alternators offered in the RX-7s....calling it TII is convenient, but calling it the 80 amp model is specific and the '89 -'91 S5 alternator will say it right on the tag....you have to look or be told specifically it is an 80 amp model to know you got the right one...assume nothing...except that the conversion work I've laid out for y'all is correct...

 

i just put an fd alt in my 84 gsl-se and it went in without much problem. had to grind some clearance on the v pulley that i robbed from a mototech alt my neighbor had laying around in his barn.
otherwise hookup and install went flawlessly

 

So what difference did you see with the alternator change??

 

actually not much running wise other than my alt/amp gauge always reads at a higher level and never goes below half now at idle.
i am running about 800 watts of amps, a black magic electric fan and the electric 6 port mod on the system so far.
with the cost of the used off ebay 100amp alt and any other expenses(wire/terminals), i have under 60.00 in this mod.
not bad i think

my next mod will be one of those 7 point engine ground setups i see mazdaspeed sells.
they say it will improve performance.
i will keep everyone posted

 

This is a problem I'm taking up in earnest now. Once I get some info from Ari or Chris and then get my hands on a wiring diagram for the '89 to '91 rexy charging system, I'll be able to do a step-by-step to complete this thread for real.

For now, this is the last step necessary in order to get the TII 80 amp alternator to work absolutely correctly in the FB chassis, this time the mod being done in my 1983 S RX-7 keeper.

For starters, you'll need one of these: