BARF1

I'm thinking about buying a turbo II to build up to possibly take on the AKA rally and am trying to learn what I have to do to it to get over 250hp on it. I've got a good idea what I need but am lacking knowledge in the a/f ratio controllers. How hard is it to install and tune one like the A'PEXi SAFC-II? Would a simple fuel pressure regulator work fine to prevent running rich with larger secondary injectors and a walbro pump? Any help will be appreciated.

incendui

Installing an safc is easy if you have basic soldering skills, and I'd definitly get one over a fpr. If you have a wide band its simple to tune also, it has a nice graphical interface where you can select the rpm and the adjustment rate. People get by with an fpr, but since you can't tune it by rpm, you can't really account for the larger secondaries coming on.

BARF1

What do I need to solder into and what exactly does wide band mean? Thanks.

calio64

you dont need to solder it, in the instructions they say to use these nifty little connecters that tap into the line that can be bought at any part store, thats what i did, dont get me wrong soldering it is better but not necesary, and the wide band is a wide band o2 sensor which reads you a/f ratio more accuretly than the stock narrow band o2, i have a plx wide band which reads the a/f ratio 10 times a second or something crazy like that just to give you a example of its accuracy

good luck

calio64

it splices into the ecu, the instructions that comes with the product gives you step by step instruction, it was pretty easy

BARF1

Do I really need to have a fuel management computer or is it more for diehards trying to get every last ounce of power out? I figured i'd just an emissionless exhaust (no checks here in Michigan to worry about) and run a manual boost controller at about 10psi with the rtek7 computer upgrade so the fuel won't cut out. I don't need total customizability just yet, maybe as time goes by I will but not now. Is this a bad idea because i'm really not interested in blowing up the motor?

calio64

if you have a stock turbo you can run 10psi with the stock injectors but i recomend, atleast getting a walbro fuel pump off ebay for 100 bux, and dont go over 10 psi cause your intercooler and injectors max out from 10-12 psi. and if your going to have exhaust you dont wanna have a boost spike and then the motor goes pop, also atleast buy 1 of those cheap a/f ratio gauges even though there **** it better than nothing, just to make sure your not leaning out

good luck

Rx7 922

hey i have a safc II and my settings are in the negitives you think thats right?? wat do you guys have your settings on?

calio64

how are you tunning? with a wideband?

Rx7 922

im running pretty rich as of right now.

calio64

how are you reading it? on a narrowband a/f gauge?

Rx7 922

on my air/fuel gauge its mostly on rich, and when i go to the settings on my s-afcII they are in the negitive percentile

calio64

well atlesast it not reading lean, ive heard of people going in the negative for low throttle but probably not under boost, i know when i had my stock secondary injectors i had it in the positive under boost

BARF1

I forgot to mention that I plan on getting some 720cc secondary injectors and the walbro pump, porting the wastegate also. I don't think any of that is too extreme to need massive control over all of the fuel timing and whatnot. Thanks for the info, if there's anything else you can think of please let me know.

incendui

An safc doesnt give you massive control over the fuel and timing. It just tricks to ecu into thinking more or less air is entering the engine. But of the cheap fuel control options, its the best. And if you're putting in larger injectors, then yes, you need something. The stock ecu will think its using 550cc injectors and you'll run too rich. I haven't been following the rtek7 upgrade, but if his chip accounts for larger injectors and more boost, then maybe you'll be fine. But if you try to add more boost without adjusting fuel somehow, you're just going to blow the engine.

And while you can install an safc with crimp connectors instead of soldering, I strongly recommend against it. If the wrong one comes loose, bye bye engine...

BARF1

I mainly would use the rtek7 upgrade for it's ability to not shut down fuel to the second rotor when it boosts too much, but I may as well just get an fcd and run a second boost guage, probably more accurate that way. If I run the larger secondary injectors and an safc then the motor shouldn't blow apart? Installing one doesn't seem too hard but how about setting it up properly, is it a pain, what do I need to know?

Sacker90

I got 720cc secondaries, walbro pump, and a fcd goin to about 11 psi of boost doesnt seem to mess anything up. My narrow band a/f gauge says im runnin a little rich and i shoot a couple of flames everyonce in awhile, but i guess i just need to get 93 octane.

RIOT1

lol 93 ron. sorry

but ****.

you know these cars are meant to run 100ROn PULP like in japan.
their premium is something like 104 or 106RON!

sigh shitty australia.