Tuning low throttle on SAFC II

[Ho0ked]

I know its been said in broken posts and unclear messages but please, again.

Could some one please explain, corectly, and in plain simple english how to tune a 96 Gst with SAFC II on the LOW throttle settings.

Thankyou in advance

 

[siceclipse]

rev your motor in park or neutral to the desired RPM and watch your logger, take out or add fuel till STFT is on 0

or you can do it while cruising on the highway but with someone else in the car.

another way to do it is by following RRE


Initial AFC Tuning (Low)
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

from: http://roadraceengineering.com/newafc.htm



i know its for a S-AFCI but its all the same.
an EGT gauge is a good thing to ahev at this point as well

 

[CanadianTSi]

Get your Short term fuel trim to 0 or close to it for all your settings up to 4k then just carry the 4k numbers all the way up.