Question about Fuel Trims with AFC

[~97TalonTSi~]

I just got my logger hooked up and I played with it a little at idle. I can watch my short term and long term fuel trims. I have no clue what this means...I know I should know this already but can someone explain it to me...why it's in % and what it should be.

Thanks

 

[turbolover2]

http://www.vfaq.com/TMO/

^^^^^^This will answer a lot of your questions. Enjoy!

 

[~97TalonTSi~]

Thanks that site is imformative. In RRE's AFC tips, they say that ajusting leaner at a given rpm until the ecu can no longer correct itself, then richening it back 10% will put you at 0-5% fuel trim. Why do they say 0% is stoitch and TMO says 100% is stoich?

www.roadraceengineering.com/newafc.htm