SAFC- Two Airflow Settings?

[Apeximprt2nr]

Hey, I've had my SAFC for a long time and have always had a decent tune but had a question.

Is it possible to tune for low airflow and mid airflow?

i.e. Up to 50Hz is one setting and 51-125Hz (mid) is another setting?

I'm asking because if I'm on the throttle below 125 Hz my STFT will be high (10+) and my LTFT will be about +7. Once I get above 125Hz my FT's will be pretty much 0 (GIve or take 3 or 4).

If I was able to have different settings for different airflows, instead of just one setting for no matter how much throttle I give my FT's would always be dead on.

 

[91talon27]

With an SAFC you can set the throttle position for when both the low and high settings take effect. I had mine set at 15 for the low and 80 for the high. It will use the settings for the low at anything below 15% throttle and will use the high at anything of 80% or more. It estimates the flow of anywhere in between based on the throttle percentage that you are using. What are your low and high settings set at?

 

[Apeximprt2nr]

I know, my Th-Points are at 30/70, but that's not what I'm asking.

I reach 125Hz way before I hit 30% throttle.

 

[91talon27]

I'm asking because if I'm on the throttle below 125 Hz my STFT will be high (10+) and my LTFT will be about +7. Once I get above 125Hz my FT's will be pretty much 0 (GIve or take 3 or 4).

If I was able to have different settings for different airflows, instead of just one setting for no matter how much throttle I give my FT's would always be dead on.

On 2G's You only have 2 fuel trims, a long term fuel trim (LTFT) and a short term fuel trim (STFT). The STFT varies with the O2 sensor, an the LTFT goes for every rpm range. Since the STFT directly effects the LTFT, then you can just add the two together, and tune from there. For example, if the LTFT is +20%, and the STFT is -5%, you are at approximately +15%.

Where on a 1g you have 4 fuel trims. The low trim is for idle and low rpm cruise conditions. The middle trim is for medium cruise rpm's (1500-2500ish) and the high fuel trim is for 2500+ rpm. The O2 trim is constantly changing with the O2 sensor, and it is what will cause the Long term fuel trims to change.

I hope that helps answer your question.