I have a few questions about my AFR's at idle, and at WOT. Any help would be greatly appreciated

First off, the weather has been kinda crazy here (90 one minute, 60 the next), and that seems to have a big effect on my afr readings. Is that normal? I can't quite figure out the exact relation yet, but the car seems to run richer overall in warmer weather. Would that be normal? This only worries me because my car was tuned on a hot dyno during a 90 degree day and my readings seem to be pretty lean when the temp drops.

Second, I have noticed that when going through very low mph zones (my neighborhood), say at 15mph in 2nd or approx 2000-2300rpm, my car runs very lean unless I accelerate a little bit. But if I hold steady at 15mph using about 7% throttle, the car is very lean. Is this normal? If not, how would I go about fixing it?


Third, This sort of relates to my first question, but this morning I did a 3rd gear pull on the way to work (graph below) and at WOT the car seems to be running too lean at around 12 all the way. Thoughts?


Bonus question- in approx 80-90 degree weather, the most boost I have seen is approx 7.5psi. This morning in 55 degree weather, I registered 8.5psi. Does boost really vary that much based on temperature?

Thank you!!!

 

Colder air is denser and will lean out your air/fuel a bit. Also you will see more boost. Your air/fuel is supposed to lean out in light load to save fuel. No need to worry about it.

 

12 at WOT is fine. Also, 7% throttle your car will run lean. this is fine due to your car not being under load.. Id say your numbers are fine. But, im not master mechanic

 

Are you SC or turbo'd? The numbers look fine, the ECU runs in closed-loop during part-throttle which is why you get lean AFR's which is perfectly normal.
12:1 at WOT is fine for an SC but id go a little richer if turbo'd

 

post a screen shot of your fuel map

if the boost is different the the afr may be different depending on the map.

 

Thanks for the replies, it is supercharged.

 

Here is my fuel map

 

Your afr changes with boost bc the fuel map is telling it to

 

Normal.