alright i have 550 injectors. s4 turbo. stock set up. but i got a free fcon when i bought alot of stuff from a friend. i got it and it was on 3, s hould i keep it at 3 or rich it out more to 4?

 

stock settings are 5. But if you put it on 1 it runs way better. it suppose to rich it up a little if you raise the numbers. If you have the GCC you would need to put it on 9 so that you can change the fuel trim.

 

that made a little bit of sence. ..
5 is stock. so why would i want to lean it out ?
whats a GCC?
sorry i am new to the tuning. hell i dont even know what fuel trim is
i just want to put it to a good setting thats maybe one richer then stock for break in and untill i get my seals settled in from rebuild

 

Is this in a TII?. PFC FCON make you run really rich. Putting it on 1 is a peg richer than stock. If you have it on 5 than you will be running richer. For the GCC it is a fuel control device for the PFC FCON, It looks like a equalizer. Do a search on it
HKS GCC CONTROLLER.

 

awsome thank you
yes it is an s4 tii with an fcon. not fconII
i'll research that thanx!

 

There are only 2 fcon's Old shool is what you have now called PFC FCON and the new one is HKS FCON V pro.

 

well i did a search and all i found was a bunch of threads about how to install boost controlers. go figure.
behold . the power of rx7club search.........
LOL
it never gives you what you need now does it.

i just want to know whats the average stock setting , and what is a danger zone on the fcon settings. i dont want to bust a seal cuz i changed the setting. its on 4 right now.

 

My advice is to borrow a wideband.

In my S-AFC days, just going by someone's settings even on a stock setup can lead to problems. See where your setup goes with those settings and take it from there, and the best way to tell is a WB.

 

ya. i would have bought one but i couldnt budget one in. thats why i am looking for a more rich then normal setting so i am at least safe to break in the engine a bit befor i can take it to a dyno

 

Main reason I say that is because I blew a rebuild once from running too rich (blowing out the saprk and dieseling)

Rich doesn't always mean saftey.

If you are planning on dyno'ing, may as well just zip it over there and break-in on the machien a bit. You'll at least have some AFR's to look at.

You're probably fine to run at whatever setting its running at, I'm just super-paranoid from my loss

 

the fcon is pretty simple. 0 is stock 9 is as rich as it can go. how rich you need it depends on the mods you've got and the boost you wanna run.

each click is ROUGHLY .5 afr...

for a stock engine/injectors/2.5" exhaust/turbo 2-3 is prolly about right

its up to you to verify that the mix is right....

 

i had mine set on 3 with the mods inmy sig and it went all good. Never checked the afr but if it ran ok stock, cranking it up abit for saftey cant hurt aye. I was running 11psi

 

ya i'd be paranoid too. thanx for the advice.
i'll keep it at 3 or 4 for now. its on 4 now. but i'll probly put it back to 3

but what is wierd is why would 0 be stock. wouldnt it be able to run leaner then stock? wierd

 

I've been using F-Con's for years on a few cars that I've owned.

Setting 0 is stock. However, if you have the need for an F-Con - you don't need stock settings. Right?

If you are running stock injectors and stock turbine, the channel you use is determined by the boost you are running. Make sure you have the correct ROM - especially since almost all F-Cons are purtchased used. I know from experience that the incorrect ROM will cause you nothing but grief.

A GCC - is similar to an equalizer for your stereo. You can fine tune the F-Con. In my opinion the GCC is completely unnecessary for stock turbine and injectors. HKS has a great fuel map built in you only need to adjust the channel on the F-Con itself for boost you are running.

I would run on channel 3 with your setup -of course that is assuming you have not opened up the exhaust and are not running cat free.

You can tune to the correct channel on the F-Con with a wideband or roughly with a narrowband. However, HKS recommends the use of an EGT gauge to tune. EGT is primarily what I use to tune my car for the proper channel. I am running 800cc secondaries and a hybrid turbo so I use the GCC to remove fuel on the upper RPM ranges. I have my turbo manifold tapped - but you can also take readings after the turbo in the downpipe (you will use a different temperature for your target).

 

Greetings from Greece
By searching the forum about FCON PFC i found this thread which is very informative although its so old!!!!

So i decided to post my question here.
My car is a FC3C turbo II S5.
I have installed a brand new 13BT engine core, 3" dual exhaust, HKS intake with TID, front mount intecooler, upgraded fuel pump, stock injectors, aftermarket fuel pressure regulator.
I am in the break in period so i dont push the engine. 4000rpm shifts and 5psi maximum boost after the first 1000 miles.
My problem is that the car runs rich at idle and you can smell it and in the readings of the AFR gauge that i have installed.
I know that this is not good for my new core because carbon deposits will form inside the engine.

I have also bought HKF FCON PFC with FCD but i havent installed it yet.
I wanna ask what is the proper FCON setting for my setup.
Also...is it possible to get a leaner idle by using FCON?

Thanks in advance

 

Anyone?

 

It sounds like an HKS PFC F-CON with a fully stock setup. Have you confirmed that the ROM inside the unit is for your setup? These are often swapped which will throw everything off if it is incorrect.

One trick is to drill a small hole on the casing so you can access the adjustment in the vehicle without needing to remove the cover.

 

oh someone with FCONs

can anyone send me the manuel for installation? and a list oft parts. cause i miss the HKS pressure sensor for my FCON V!!!

the car doesn´t start ... no turbo pressure @ original turbo pressure gauge! i only installed the three original clips into the ECU ... and the ones from the ECU into the FCON (harness kit FC3s)

i own a ´90 Turbo II Coupe

 

Here is the manual...
http://www.fd3s.net/fcon_install.html

Any more FCON users to help and tell us their settings and car setup?

 

Many times the PFC F-Con may have a different ROM chip when they come from Japan as these need to be changed when you go with a full turbine kit and some are custom made from different shops. If the ROM that you have is wrong for your setup it will not run correctly.

 

Yes i know that. I have the correct rom. Its for stock injector,stock turbo, upgraded air intake and upgraded turbo back exhaust.

My problem is that the car runs super rich at idle and low rpms and it runs lean when i boost it with full pressure.
Is it possible to have a faulty AFM?

 

possibly but highly doubtful. make sure you have no leaks or cracks in your intake. from the snail back.
The fcon can not make you idle leaner. you will need the gcc. I have both and have no complaints. i have ran 14psi and everything in between. very simple to use.
I seriuosly suggest anyone trying t change the fuel mixture get a wideband. its much cheaper than a rebuild and gives you peace of mind. PRICELESS!

 

thanks for your answer.
Can you achieve a decent fuel map by using an apexi afc in combination with the FCON?
Is that safe?

 

Bump.