I can clear/live with CELs, but did it actually change the AFR.

Limp mode I can't deal with... Only time I have gotten limp mode is when I messed with the drive by wire system, tapping the TPS signal.

 

It will compensate in closed loop mode, I have played around with it a bit with my DTEC-FC (different version of the SAFCII) and it seemed to me without a WB o2 sensor that the PCM would just trim the fuel accordingly, EXCEPT in WOT/OPEN loop mode. Then the PCM relies on the sensors and a table to give you fuel and not on the O2 sensor.

These are just my findings they aren't scientic, and really I don't know what I am doing Just trying to learn.

I just looked at the fuel trim tables and could feel the cars power studder when I would switch from my alerted DTEC MAP to the non alerted DTEC MAP. If you would cycle the engine the problem would correct itself.

As for the miniafc that just alerts the MAF a certain fixed amount correct? It can't do it based on load or rpm?

 

We manufacturer and sell a couple devices like these. Our MAF Translator is widely used on Turbo Buicks, DSM's, LS1's and many other cars. We also make a full speed density concersion add on the MAFT Pro ( www.maftpro.com ) We have more experience with these types of tunig devices than most folks. Now the bad news, these devices manipulate the air flow signal. The stock PCM very closely monitors the air flow and compares it to MAP pressure and RPM. This is for the drive by wire diagnostics any large variation of airflow against one or the other will set a code and cause throttle problems. You might be able to get away with a few percent but for any real tuning these devices are useless on a Cobalt. If it as a ral option we would have been selling them long ago. There is only three real options, a stand alone, a reflash, or a unit that processes injector pulsewidth AFTER the PCM. We are looking at that option now in a fully functional unit that will process spark timing and fuel.
Mike Licht
Full Throttle Speed

 

The Mini AFC 2.2 have two modes : the standard and the enhanced mode. The enhanced mode gives you the opportunity to tune at each thousand of the MAF frequency range, between 1000 and 13000 kHz. It works great.

 

The device is also available from ZZ Performance : Here is more info ...

The AFC 2.2 (Air/Fuel Controller) is a micro processor based air fuel calibration device with digital display. The AFC performs this recalibration by receiving the Mass Air Flow (MAF) sensor’s frequency signal, digitally recalculating a modified MAF frequency value and passing this modified frequency to the Powertrain Control Module (PCM). The AFC can be setup to run in Standard Mode or Enhanced Mode and can be programmed to apply correction factors ranging from 1% to 255% of the original MAF signal.

To elaborate on this, correction values less than 100% cause the PCM to perceive less air is entering the engine and it responds by commanding less fuel be delivered to the engine. Thus, AFC values less than 100 pull fuel from the engine. Conversely, correction values greater than 100% cause the PCM to perceive more air is entering the engine, causing it to command more fuel be delivered to the engine.

This means AFC values greater than 100 add fuel to the engine. Two separate operational modes are provided. The current operational mode is announced briefly on the display during the AFC's boot up routine. The user can switch between operational modes on the fly without shutting off the car or resetting the AFC. Switching between operational modes as well as all editing is accomplished through the three interface buttons below the display. All set point editing is accomplished through these interface buttons. All data is automatically stored into memory when leaving any edit mode. This means all set point data is saved for subsequent system power ups.

Standard Mode – Applies a single correction factor to the entire frequency range (air flow range) of the MAF sensor. Thus, regardless of the MAF sensor’s frequency signal sent to the AFC, the AFC will apply the same correction factor.

Enhanced Mode– This mode provides 13 independent set points that allow custom fueling curves to be programmed into the AFC. The enhanced mode sets these 13 points in even 1,000 Hz intervals starting at 1,000 Hz on the low end of the MAF’s output range and all the way to 13,000 Hz at the high end of the MAF’s range. For MAF values between these defined set points, the AFC linearly interpolates the output frequency using the bounding set point values. Thus, the AFC creates a smooth curve throughout the MAF sensor’s output range.

The AFC is needed when the engine’s fueling demands have been altered by changes performed to the engine induction system. When induction changes have changed the fueling demands, the OBDII Powertrain Control Module (PCM) typically responds by adjusting the Long Term Fuel Trims (LTFT). (Fueling Trim values are a adaptively learned parameter the PCM uses to make minor adjustments to the fueling parameters to obtain the target programmed air/fuel ratio.) This unit allows adjustments to the Mass Air Flow (MAF) sensor’s calibration which impacts the fuel trims. With proper adjustments to the AFC, the LTFT values can be brought back near zero where the PCM functions optimally.

Technical Information:
* Plug and Play installation with OEM weather pack connectors
* Allows the MAF sensor to be fine tuned to the engine’s configuration
* Powered by voltage power to MAF Sensor with negligible power draw
* Single user set point correction in Standard Mode
* 13 user selectable set point corrections in Enhanced Mode
* 9 inches long from connector end to connector end
* Connectors keyed/indexed for proper connection)
* Compatible with all GM Mass Air Flow (MAF) Sensors
* Available in a variety of MAF connectors (E.g. GM L67, GM LS1, GM L67 to LS1 Conversion) to fit any vehicle/engine configuration
* An on board microprocessor executing proprietary computations and program algorithms is incorporated to achieve this recalibration with digital accuracy
* Detailed, color illustrated installation and user instructions included.

http://www.zzperformance.com/cobalt_...ddcfbe39d4f75b

 

Wow. I need to read that like three more times to take all that in. ^^

 

^^^agreed...i may have gone cross-eyed

 

me too. I don't understand how all this works. I am very new to this, still young and have only worked on old cars myself and with my father growing up. I can't even remember him owning a performance car that was even fuel injected, let alone 4 cylinder and fwd. I am trying to learn as fast as possible. but can use all the help I can get

 

Thanks JMC007...that was some really good info. My only question now is, how do you know where to start when you're in enhanced mode? I mean, if you **** up the a/f enough, you could do some major damage to the motor. Definately sounds like a good product, but what sets it apart from things like APEXi S-AFCII or the Greddy e-manage?

 

By default, the enhanced mode start will all the set points set to 100%, which means no correction at all. So it's a safe point to start, then you do some dyno runs with an air fuel metering device, to see where are the points to get better.

Since I don't know much about Apexi S-AFC II and Greddy, I cannot say how it compares. But I know the Apexi is tricking at least two parameters, the MAF signal and the MAP signal. But there is big chances that the "very intelligent" Cobalt SS PCM will throw some codes when tricking too much parameters at the same times.

 

you are absolutely right and this is why the safc does not work however our tuner box works perfect as we based the software to work on these cars. i have been testing it on our cobalt now for 1 months.

 

actually, the 04+ Grand Prix's have Throttle By Wire and these AFC's have had no problem with them. No codes set or anything.

 

What "codes" are setting?? The AFC is is most valuable under WOT/PE mode, when the O2 sensor is ignored. Any other time, the PCM is doing whatever it takes to command 14.7 to 1 I'm going to test it next week but this is only temporary as HPTuners is going to add Cobalt support

I've been stranded before by an AFC so i'm not to hip on using them exclusively.

 

but for someone looking to just tune there car a little and not into making it a race car, its a viable option for the price.

Plus if youre talking about them melting, theyve fixed that problem.

 

THe GP computer and the Cobalt computer are quite different and the diagnostics are not the same.
Mike

 

I installed the Denso Iridium IK27 (three range colder than stock), but there was a LOT of knock with them. As expected earlier, since the electrode is so small and take less voltage to spark, they seem to spark either stronger or sooner, giving some knock (the timing being not optimised). I went back to NGK V-Power BKR7E.

 

Updates ?

 

I bought a performance module that is supposed to be spliced into my Intake Air Temperature sensor.2006 cobalt ss supercharged,where is the sensor???Which wires do I tap into?IM putting an air intake in also but I want this module and cant find that sensor.Any help is greatly appreciated. thanks

 

um first off i wouldn't have bought anything untill i checked it with members on this site to see if anyone else has purchased it. Second where did you get it and post up a site so we can check it out and see if its legit or not. And 3 please say you didn't buy some crap off ebay. There nortorious for selling crap that doesn't work but says its designed for performance. Not trying to come offs as a dick but its the truth let us have a look then will tell you if its safe to go splicing wires. We can't help you if we don't know exsactly what it is.

 

I did buy it off ebay,all this does is change the signals of the IAT.All I need to know is where that sensor is on my car.Is it near the filter?In the fender well?Intake Air Temperature Sensor.I am an ASE certified mechanic,I know that this will work if it sends different signals to the PCM.I want to know where that sensor is and if anyone has done this upgrade before. mtr111685@verizon.net

 

As with many GM cars the IAT is integral to the MAF. Try the tan wire
Good Luck!
WOT

 

this module has 2 wires,thank you for your reply though

 

umm yea, doesnt it "tap" into the IAT just like ALL of those Ebay ripoffs? Just cut the tan wire and connect each of your wires to either side there Bucky
WOT

 

umm yeah,How are you supposed to tap 1 tan wire into 2 wires and not short anything out???umm yeah,are you a mechanic?you must work at a speedy oil change place.I dont need your attitude,just asking for advice.I have big plans for this car and it all adds up in some way.this is just one small thing Im doing ok?is that alright?I dont care if you think it will work or not Bucky.If someone that knows what they are talking about knows where my sensor is please inform me.thank you

 

LOL You're too funny
(and you're the one that bought that piece of crap with no instructions and no clue)
Keep up the good work!
WOT

PS> Here's a schematic for the IAT portion of the LSJ MAF if it will help, but it sounds like it wont
Good Luck!