Anyone Using Apex AFC neo? Need help

[TurboTuner2.3]

Hey guys,

My friend has a 87 Supra NA that he converted to a full 7MGTE swap, and he has the AFC neo installed on it, but never set it up at all. I am reading this write up on it, about how to set up the AFC, for a DSM in this example...

http://my.prostreetonline.com/t105.htm

Does this seem basically uniform for the 7MGTE, how all maps basically have to be setup from scratch for all RPMS for all throttle percentages 0-100, and for all RPMS?

I was just wondering if there was anyone that could give me any further tips or tricks with using this tuner on a 7MGTE because I have never used one before and it seems like its going to be pretty difficult.

Any information or help would be greatly appreciated.
Thanks,
Bob

[Jeeves]

Your throttle percentages need to be set to change maps at 68% throttle. You CANNOT TUNE the idle fuel map as it is closed loop and will tune itself and ignore your changes. Above 68% throttle it goes to an open loop map, which means it ignores the other sensors that would normally adjust the tune.

If I recall, the settings are:
CYL: 6
SPD: 4
Throttle: "Arrow pointing up and to the right"

Other than that, you must use a wideband to tune the AFC. They are relatively worthless without a Dyno (that has a wideband) or a wideband of your own. They are incredibly easy to tune if you have the necessary equipment. Essentially, you have RPM points, and you can increase or decrease fuel at those points by up to (I think) 50%.

[TurboTuner2.3]

Well it's got 550cc RC injectors, so nothing in closed loop has to be adjusted/compensated for larger injectors, or if so, what would have to be adjusted?

I have a LM1 Wideband, so i know the AFC has an input for an Oxygen Sensor, but does it take input if a narrowband signal or wideband signal? The directions I have read talk about using the O2 source from the ECU to make adjustments and watch the O2 voltage, but doing that for a narrowband readying does squat!

That being said, the LM1 has an analog output signal that has one wire that outputs a wideband signal, and one outputs a narrowband signal, and the 3rd is just a group, so If the AFC can make use of a wideband signal then that might work out well...

[Jeeves]

Originally Posted by TurboTuner2.3

Well it's got 550cc RC injectors, so nothing in closed loop has to be adjusted/compensated for larger injectors, or if so, what would have to be adjusted?

I have a LM1 Wideband, so i know the AFC has an input for an Oxygen Sensor, but does it take input if a narrowband signal or wideband signal? The directions I have read talk about using the O2 source from the ECU to make adjustments and watch the O2 voltage, but doing that for a narrowband readying does squat!

That being said, the LM1 has an analog output signal that has one wire that outputs a wideband signal, and one outputs a narrowband signal, and the 3rd is just a group, so If the AFC can make use of a wideband signal then that might work out well...

The AFC has no use for a wideband signal. ALL it does, is take an input signal, check to see what RPM the engine is at, then either increase or decrease that signal by whatever percent you put into the AFC. In fact, the NEO (nor any of the other AFC products) have ever used an O2 input, so I'm curious what device you're talking about.

[img]http://www.**********s.com/supra/acfneo_diagram.jpg[/img]

The voltage trick (which I believe was an old SOGI hack, but I can't find it on their page) has nothing really to do with figuring out what the O2's are. What it does tell is what the ECU is doing, whether it's attempting to lean out or richen the mixture, people used to wire up lights that would light at specific voltages to make it easy.

The car is going to run rich initially with the 550's because the car expects 440's. However, it should tune itself down. I say should, because I'm not sure. I'm using an VPC that has an eeprom designed for 550cc injectors. Really the below 68% throttle map is ignored because of it's 'untunability'.

[Jeeves]

Quick bump about the voltage trick. I found the article over on MkIIITech:
http://www.mkiiitech.com/forums/viewtopic.php?t=593

Looks like it has it's roots from Reg Riemer.

0V=rich, ECU decreasing fuel

1.25V=normal, ECU decreasing fuel

2.5V=normal

3.75V=normal, ECU increasing fuel

5V=lean, ECU increasing fuel

What does this all mean?

Think of the Vf signal as a peek inside your ECU. At a glance, you can see how hard your ECU is trying to compensate for any discrepancies between the signals it receives from the AFM, TPS, water temp, air temp, and engine speed (RPM), and the preset values it has stored within it's little silicon brain. For example, if you've cranked up the boost and haven't made any other adjustments, the engine is going to run lean. The ECU will be somewhat aware that things aren't what they should be -- engine is running hotter, AFM is flowing more air for a given throttle plate angle (TPS value) than it expects, etc. The ECU will try to compensate, and the extent of this compensation will be shown, in gross terms, by the value of the Vf signal. Since the Vf signal only comes in five sizes, the true extent of the ECU's compensation can't be known by this signal alone. It should, however, be enough to point out obvious problems (if they weren't already apparent), such as a need for bigger injectors, a need to change the AFM spring tension (7M-GE only), a need to add AFM correction or a need to turn down the boost. It can also tell you if your ECU's fuel table is way off the mark.