Need settings for low throttle on S-AFC

[Mistaspakles]

What are your settings on low throttle for the S-AFC?

 

[larryd]

mine are -5% across the band, but im sure it ranges from car to car

 

[rdrkt]

You would have to know all our mods to make any use of what we have to tell you. Just check the RRE site for tips

 

[GSTwkd]

Sweet car. With your set-up I would maybe try -10 across the board, do some runs, read your gauges and a pocketlogger and go from there. But it depends on alot of stuff. Mine are set at -10 but your pushing alot more than I am. Have Fun

 

[L2RTSiAWD]

You can see my mods in sig and I have around -20 -25 across the board.

Later,

 

[NJGSX96]

You really cannot set your lows based on anyone else. Your best way to set the LO throttle settings would be with a logger and try to get your STFT as close to 0 as possible, give or take -+5.

Seeing as you do not have a FPR (not that I saw in your list of mods), you are probably overrunning your regulator so you should lean them out pretty good. The RRE site does have some decent info to go by until you can tune them with a logger. From the RRE Site:

While in neutral, try revving the engine to the exact RPM settings on the AFC. Hold the RPM, and then start playing with the setting for that RPM. Listen to the exhaust. Start on the rich side, the engine will likely sound very "smooth". Slowly work your way lean, you'll start to hear misfires (popping sounds). A good point is probably where things just start to pop a little but are pretty close to "smooth" (rich). Watch the O2 sensor voltage or A/F ratio meter. Normally the voltage will swing back and forth between .2 and .8 volts at idle and part throttle cruising. . As you adjust leaner, the ECU will compensate back richer. Slowly click down leaner so that the LEDs do not come up. You will then see the O2 voltage come back up slowly. This is the ECU re adjusting. Keep going down until the ECU can no longer bring the A/F ratio back up to swinging in the middle LEDs (.2-.8v). From there richen that rpm point back up about 10 percent. That should put you pretty close to 0 to 5% fuel trim at the ECU.

Next repeat the same thing driving the car on the freeway. Hold the car at the rpm that you are going to set. Note what percentage you are beginning with and slowly go lower until the ECU can no longer richen things back up. Go richer about 10% more and compare that with the compensation percentage that you started with. You should be fairly close.

When you get things too far out of whack, you will most likely get a check engine light code for Fuel Trim. It just means that the ECU was trying to adjust things to get back between 0.2 and 0.8 volts and couldn't. Don't panic, this is normal. Try to figure out where you were too lean or rich and fix it up. Re-set the ECU and see if the code re-appears.