Got a dilema here... Should I install an F-CON or an Apexi S-AFC in my 88 Rx7 Turbo II? Does it not matter? I heard Apexi is the way to go... Not sure what I should do here. Yes, did a search and found no threads on the comparison of the two products

 

If you're going for a TII with standard mods (TID, downpipe, catback + boost controller) it's FCON all the way if you can find one used. plug n play, this comp is made and pre-programmed for the FC and will handle these mods just fine (get a better fuel pump though). If you plan on swapping turbo's, injectors, etc...for MAJOR power you'll want something with flexibility like a haltech or TEC III.

 

What are your current mods, and future goals?

 

CURRENT MODS:
No cats / straight pipe
HKS mufflers
K&N Cone Intake
720CC secondary injectors
Hi-flow fuel Pump
Blitz Turbo Boost Controller

All on order, all coming soon for install. no cats w/straight pipe completed + mufflers.

How much more power can I get with these mods? should I get the S-AFC or F-CON?

 

Oh, I am going to add the ZEX AIR INTAKE APLIFIER (dry nitrous) come January.

 

I'm not 100% sure but I don't think you can run a f-con with different injectors (ie 720's).

Tim

 

Yea you can, just runs richer. Or get a GCC.

 

need a GCC to control larger injectors...

 

In that case, it would be best that I just get the Apexi S-AFC, correct?

 

what is a GCC

 

GCC = graphic control computer...made by HKS to work with the FCON for use with larger injectors. an AFC will work to bring the correction down but NEEDS to be done ona dyno.

 

dry nos = bad

 

Never mind, I just found out. Graphic Control Computer. Anyways, how hard is it to tune a f-con with a GCC. Would you need a dyno. Or could you do it without one?

Tim

 

UGH! What a pain this is becoming! Geesh, so now I need to hook my car to a dyno just to install bigger seconday injectors? ugh... that sucks. I dont even know where there is a place to do a DYNO.

 

I feel your pain man..

 

Do you really have to dyno a car when you swap out injectors? I would think that if you wanted to get the most power possible you would but why would you not just install the mods, run it rich and tune it down until you're running slightly rich?

 

You have to have something to tune? (Stand-alone, S-afc) 720's will run rich. The f-con is used for stock cars to improve the curve maps. (also to increase the duty cycle on the stock inj.) Check it out at their website. You can down tune the 720's only +/- 15% with the GCC (and would need to go on the dyno) So if your not going to get any sort of stand alone (the best and will save you headaches, always) then get the s-afc. It works well.(also on the dyno)

HKS

 

ugh. ugh. smack on the forehead... bang head against wall. Guys, why are these 7's so difficult to tune? Its not a matter of money it knowing where the "F" to find a dyno etc. So, if I dump 720cc's w/ S-AFC the car will run rich? That is not fun.

 

it's not that it's difficult to actually tune, provided everything in your car is in good working order you'd only really need 3-4 runs to get the car where it should be...tuning without a wideband and a dyno is very much a guessing game without a standalone ECU, especially with a rotary that can only take a couple pings before dying. the car will be too rich with 720's and should be leaned a bit for good power, you just don't want to lean it out TOO much and you don't want to make bad guesses. save your $ for a couple dyno runs...you'll be tuning the right way and you'll know how much power your car makes in reality (then you can brag to your friends hehe)

 

so which system is being recommended? Fcon or SAFC? im guessing FCON- beginner friendly. SAFC2 not beginner friendly. does one have more potential than the other? or are these pretty much dead even units? -alex

 

okay! Some luck came my way! I found a place about 30 min from home that can DYNO tune my car. I am going with all of the above MODS but with an APEXI S-AFC. I'll just get it DYNO-TUNED and do it the right way. So, I dont need the F-CON or GCC with 720cc secondaries - the S-AFC (once dyno tuned) will do the needful?

 

can the safc be used to tune 720's?

 

Apparently so. I was told that the S-AFC can be dyno-tuned (+ the mods I have) to run right.

 

There should be no reason the S-AFC can't support the 720cc injectors. It just adjusts the signal being sent to the injector in order to change the fuel curve. It doesn't even care what the injector is, it's just changing the time spent open.