NZ_87_TURBO

OK, so ive got a PFC FCON right. ive looked at the GCC and for the price they are new ( and since ive never seen a second hand one in NZ) im thinking that using a SAFC ( 1 or 2 ) would be a good idea as it would result in minimal timing advance - the issue i have with using a SAFC is that it changes the required retard that you would normally see when running higher boost, which if your honest here is why your running a safc in the first place.

so my logic tells me that since the FCON has actual fuel maps that it uses and retaining the stock timing advances/retard etc that if i wana plum in some 800-1000cc secondary injectors to manage the increased airflow and boost pressure from the TO4 compressor cover and wheel ive just got, that if i do my fine tuning with the SAFC while using the closest map/setting from the fcon then i wont be messing with the timing to much.

Can someone confirm my logic and theroetrical workings and let me know what you think.

I know some people will say, why run 2 piggy back computers, why not just run a standalone, and the answer is money. i dont have NZ$2000 for one
i payed NZ$200 for the Fcon and can get a Second Hand SAFC2 for anywhere from NZ$230-350. so if you look at it that way NZ$500 (US$340 ) isnt to bad to retain stock timing curves designed for increased boost.

basically im about to put this turbo in with a V mount I/C set up and plan to run at least 1 bar boost. am i in the ball park with 800-1000cc secondarys for this?

NZ_87_TURBO

as ive been reading more and more im now thinking that since the Fcon is already increasing my fuel maps so if i put say 800cc secondarys in, then they will be pumping out mega fuel and i will have to take alot out with the SAFC, when people are running higher boost say 1 bar with a walbro and 720cc ( since they seam to be the most common) and a SAFC are you still taking fuel out?

also are there any big differences between the SAFC I and II?

FC3S Murray

iTrader: (7)

OK man, I have a Fcon and a GCC. I used to have a TO4 hybrid and was running 720's all around. I was pushing 14lbs. My timing was a tiny bit advanced. I have a wideband in cabin and to tell you the truth, I was running damn near almost 12.0 on my wideband, normally 11.5 WOT. To close to danger for me.

If you were to run 800 secondaries you could be in the safe zone, 10.5 to 11.0 AFR. I would just try to find a GCC here on the forum or on ebay, I have seen many here and there.

To be honest though man, running oversized injectors on an Fcon that is made for 550cc make the car a gas hog and the transition to secondaries coming online kinda ruff. I get horrible gas mileage even after tuning the GCC to run lean up until 5000rpm. The car pulls great but you can tell it is not up to its full potential if it had some sort of timing control and a fuel computer that is operatingwith the right fuel injector size.

NZ_87_TURBO

Cheers FC3S Murray,

If you were getting those AFRs then surely id be less with 550's & 800's ( combined = 2700 vs 2880 ) i guess my secondary transition would be less harsh tho esp if i tuned it out with the SAFC ( it runs between the FCON map sensor and the unit ) so wont be messing with the AFM signal. So i guess i would just be trying to tell the FCON its running less boost at around 3800 to make the transition period ok. Did you just advance your static timing?

I thought 11.5 AFR was the ideal. your saying it should be 10.5-11, would this richness be causing your bogging

FC3S Murray

iTrader: (7)

I just advanced the timing via manually adjusting the CAS. For 14 to 15lbs of boost you want to stay in the low 11's. I dont let it go higher then 11.5 period!

As for the transition, this can be cured with some fine tuning fom either the GCC or your SAFC. Since I have had the F-con I have just noticed that it operates great if not "modified" BUT when I statrted putting in different size injectors the computer got moody. Still performed well when the need to haul *** was justified but was very touchy when wanting to just cruz or give small increments of throttle.

Try the SAFC out NZ87. If it is indeed successful I might consider doing this until I get my megasquirt up and running. (I have a 60-1 hybrid and it is such an increase in volume under boost that at a piddily 9.5PSI my fuel system is maxed, even with GCC cranked up. 15 psi is where this turbo starts to breath)

NZ_87_TURBO

yea i think the megasquirt is your best option. ive only for a TO4 hybrid with a 48mm wheel and .60 AR so i think i should be ok.
im guessing your problems regarding it being moody would come from the 720cc primarys you were running, i guess you coulg have leaned it out down low a bit with the GCC,

Im gona run 800cc secondarys adn the SAFC and i'll let you know how it goes

FC3S Murray

iTrader: (7)

Definitly let me know how it works. I am shooting for about 400 horse and my megasquirt will definitly help aloong with some fuel system mods. Take care man.