Hi folks, I recently bought a 92' 1.6l turbocharged Miata running a Miata MS2.
I noticed the AFR fluctuating on the gauge and I'm not sure if it's normal.
Have to say I'm all new to efi tuning, read a few books and a lot on the internet but have no other experience.
Here some info:
-Cold idle AFR: Fluctuating 17-17.5:1
-Cruising 4th Gear 2500RPM AFR: Fluctuating 13.9-14.6
-Warm idle AFR: Fluctuating 16.5-17.4
Where does that come from?
I've also noticed when I let of the Gas the AFR first goes rich about 11.9 and richt after super lean >17.5:1. I assume the fast enrichment is for the shifting interruption, is that right? Apparently some setups go either rich or lean for engine break, does this setup make sense? What do you guys recommend?
Thank's I'd really appreciate any info you guys have.