i have the apexi s-afc and the shop i bought it from set it to be a bit richer than the stock settings. will this be fine or will it be hitting fuel cut. i know i should have invested into the power fc but my car is an AUTO so it wouldnt be fully capatible and my current mods are dp, cb, intake, and bov without boost restrictions. i know people running the same mods without even an ecu upgrade so would i be safer than them? if it is bad to richen my car a bit with the s-afc then is there another way around this like maybe a fuel cut defenser? again, my car is an automatic so there not a lot of ways around this and i dont want to restrict my boost.(plz dont comment and tell me to sell my car and get a manual or do a tranny swap to fix my problem)thanx!

 

If you don't have fuel cut issues then being little rich is not bad. You may lose some hp's but it's extra safety. More difficult to run lean

 

you dont need that, it was a waste of money. and it doesnt matter what kind of transmission you have. the auto or manal require the same type of tuning. they have the same engine. if i were you i would just sell the afc, save up for the pfc and mp and be very happy.

 

As long as your boost is at 10psi or lower with those mods then you should be fine with just the stock ecu. The richer you run the faster your plugs will foul.

 

Yep, with the S-AFC, you still can't run over 10 psi of boost. And the stock ecu is rich enough for all of the bolt-ons at 10 psi, so yes, you wasted a bunch of money and are most likely running richer than you need to be.

 

using the power fc will disable the "hold" feature in autos and cause other problems unless i actually find a way to piggy back the pfc with the stock ecu. someone on this forum accomplished this but its probably major work. m2 ecu's dont support autos either. anyone know a stand alone that will actually be fully compatible with the autos? if not, i might as well get a boost controller to work in conjunction with my s-afc. by the way, i plan to get a koyo radiator and a smic in the near future.

 

That won't work, the stock ecu will still fuel cut. Yes, people have piggy-backed the PFC. I believe that you can also use the PFS ecu with an auto.

 

i think ill just buy the boost controller and set it to 10 psi and be done with. would it be worth it for reliability purposes to still purchase the upgraded intercooler and radiator even though i would only be running 10 psi? even though ill be at stock boost levels, cooler is always better for our FDs right? lets say i get the radiator and smic. hp will be increased even though boost is not. will i still need a stand alone or the stock ecu is still fine with radiator and smic at 10 psi? sorry im coming off with so many questions but im still new to these cars. thanx!

 

Yes you can run all those mods at 10 psi just fine with the stock ecu -- I did myself. BTW, the radiator has no effect on your engine performance, per se....

Yes, the intercooler will free up horsepower and contribute to cooler running, even at 10 psi.

 

thanx for the input rynberg
jus a few more questions. does the microtech or haltech ecu work on auto FDs? wat about the buddy club spec b, pfs pms, or the hks f-con? i heard they work but they are also piggy backs.

 

I don't believe you can piggyback the Microtech or Haltechs, but you can ask in the "Engine Management" forum:

https://www.rx7club.com/engine-management-forum-37/

The PFS PMS is a piggyback ECU that will work for Automatic FD's with the stock ECU.

Keep in mind, you CAN replace the stock ECU with an aftermarket ECU, but you lose the HOLD function of the stock ECU. That's why you need to piggyback the stock ECU. If you don't care about the HOLD function, you can replace the stock ECU with whatever you want.

The HKS F-CON is similar to the S-AFC. They are both just "Fuel Controllers". They will allow you to add/remove fuel, but not timing (which is why a full standalone ECU is preferred). These fuel controllers combined with a Fuel Cut Defenser can be used to achieve higher boost levels (it's been done many times) however, it's recommended to just used a standalone ECU.