I own a 93 FD with a relatively fresh Pineapple Racing rebuild (about 10k) on a stock motor. The only engine mods are a HKS downpipe, Bonex hi-flo cat, RB cat-back and a 150A alternator. The car has been apart for some time while I worked on the stereo/alarm, interior and electrical system. The car starts right up and runs great now that I've got it nearly put back together.

I have collected an assortment of parts (Efini turbos, Greddy FMIC and intake, Koyo radiator and ACT clutch kit/lightened flywheel) which I would like to install all in one session. I was planning to install the Power FC while the interior is still apart, but I noticed in the Power FC FAQ that the unit has to "learn" the idle of the vehicle which requires the A/C to be switched on. In order to install the Dynamat I removed the carpet, which required removal of the HVAC. I wasn't going to recharge the A/C until the other upgrades have been completed. How is that going to effect the Power FC? Should I wait and do the Power FC after I do the other items and get the A/C recharged?

 

The short answer is that you can put it in and it will be fine for now. It is possible to relearn the idle later.

For some more detailed explanation check out this thread https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-make-your-untuned-pfc-basemap-safer-idle-better-no-datalogit-needed-841706/ especially posts #1 and #36