NethercuttML2

I don't have any working knowledge of SAFCs or other controllers as far as the wiring or specific settings for tuning, but that's not what I'm inquiring about. This is more of a how it works type deal.

Okay, AFCs scale down voltage from the air meter, and bigger injectors/more fuel pressure compensates fuel for boost. Sounds great.

Boost is not a constant, it's dependent on load, or so I've been told. What happens when the AFC is set to add more fuel at X RPM and/or X Throttle position, but there's not positive pressure in the manifold? Or there's not as much boost there as when the AFC was set to it's certain values? Is this the problem with Airflow Sensor hacking?

I guess if I had actual working knowledge of hacking air meters it would be a dumb question, but how does the piggyback know to only add extra fuel when the boost is there? Do AFC's read pressure as well? IE Just because I set the AFC to trim my fuel safely on a hard 0-90MPH run, the engine load is not going to be the same (even if the throttle is) as say, accelerating from 40-60MPH, or city driving from red light to red light.

Supposedly there is a company in Texas that is testing a hardware+software setup that will allow us to reflash (or just re-map) the stock ignition and fuel tables, as well as rev limits, airbag lights, everything. Untill then, it's been said in the Kia community that it's standalone, or nothing. A RRFPR would be great, only A) we have a returnless system, and B) our factory FPR is built in to the intank factory pump. Maybe that's not such a big deal, but it's a hurdle non-the-less.

Basically, how does the AFC not dump way too much fuel when at X throttle X RPM if the boost isn't there? Or do I really just not grasp the concept of meter hacking?

NethercuttML2

Been snooping around, talking to a couple people, and it seems this is solved by using the 0-5v MAP signal instead of TPS. Now I need to learn how to convert from MAF...

Random Hero

well your theory is wrong

The MAF's measure flow, and if its not under boost, chances are its not flowing as much so it doesn't give the injectors more fuel. I dont feel like explainin it, but i'm sure someone will chime in.

brettsb16a2

Did you read the "READ THIS NOOB WHILE NOT SMOKING A DOOB ENGINE MANAGEMENT" before you asked that question. Sorry to say but its pretty much in black and white there. I would hack that car with an afc and boost it to like 20 psi. Honestly and not to be a smartass but sell your kia and get a honda. Instead keep the kia for driving to work but get a honda to boost. Don't be afraid, the coolness you feel is normal when driving a honda.

kablammyman

I would go stand-alone. I'm sure by stand alone, you mean megasquirt. With megasquirt system pre built by other kia enthusiasts as an option, I don’t see why you would even consider any type of hack. I understand that a megasquirt system can be expensive, but, it’s worth it, especially if you wanna boost for longer than a week. Besides, since you drive a kia, you probably want to beat on other cars that are more mod friendly/popular. With that said, you can’t make max power or have real reliability with a hack.

Slo_crx1

The afc's use both tps input and airflow input to interpolate between map settings on the controllers. There are normally 2 map types on them...low throttle and hi throttle, and the crossover point is set in throttle percentage and regulates a larger or smaller amount of interpolation depending on the percentage setting. If it wasn't for the advancement in timing factor with larger injector scaling or the lack of timing control, they would be a great all around piece to use.

Dive_Miguel

If you want a return fuel system to go with your standalone ect., you should check this link out:

http://www.autospeed.com/cms/A_2637/article.html

It is on modifying returnless systems the ghetto way.

Hitchhikkr

What ever happened to that RICE controller that one dude was developing a while back that was supposed to eliminate the whole timing advance problem Did that ever get going?