What should I be checking for when reading the AFR gauge on a daily basis to make sure car's running good? Make sure it hits 10.5-11.5 at WOT depending on what the tune was set up for at WOT, around 15 at idle and 13 at part throttle? Am I just checking to make sure it doesnt get real lean and jump to 18+ or something?


Also, is a retune necessary over time if you keep the same setup and dont add anything? Over the course of 2-3 years, is a retune needed at all to make sure things are still running/tuned as original and it hasn't strayed to a bad tune? Or is it more like, once it has a good tune, you're set for life. Well as long as you log once in awhile to make sure things look right, and no knock is detected

 

Ttt

 

Your at a pretty safe bet with those afr's give or take. As far as tune. If nothing changed on your car and it was tuned in moderate weather conditions, you should never have to adjust it.

 

With turbo cars, I hear 2 of the most important gauges are boost and AFR. I just wanted to confirm that AFR is important because it's helpful to tune a car and monitoring for the above values let's you know everything's in check.

I heard that if it's tuned in the winter cold season then it'll run ok in the summer. If the tuner tuned it in the summer season but adjusted the tune to handle the winter temps too, then one tune is good all year round. Thanks for confirming once it's tuned well, the tune won't change on its own over time needing a retune. Of course one should log every once in awhile to confirm no knock etc.

 

Anytime in vacuum you should be around stoich (14.7) give or take a few tenths. At WOT you would like to be at mid to low 11's on pump gas. Spoolup should be from 13's to low 12's depending how close you are to full boost.

 

my tuned evo idles at 14.6, at WOT i'm at 12.0 afr's

 

niceee good post, i will need to get an aem wideband. i got a defi boost and egt that came with the car.

 

12 seems lean to me at WOT, but I'm no evo guy, and the OP should also know the car auto adjusts fuel while cruising so you wont see anything other than 14.3-15.7 when cruising unless there's an issue. Check engine lights will tell you about misfires and bad injectors and spark plugs and stuff before AFR will I'd bed, or just the car will run like a subaru and you'll know.

I love AFR, boost, EGT, and oil pressure. All important if you're doing non-factory stuff.

 

found this on another site

1 AF gauge can tell you when you have bad fuel.
2. AF gauge can tell you if your tune is off.
3. AF gauge can tell you if your running rich.
4. AF gauge can tell you when your running lean.
5. AF gauge can tell you when your air filter needs cleaning or
changed.
6. AF gauge can tell you when your MAF is bad.
7. AF responds slower to engine changes if O2 sensor bad

 

Your tune over time should not change. If something starts to "throw" the tune off that means something needs addressed and or fixed.

 

My answers in bold. This is all my opinion of course, so take it for what it's worth.

 

only thing your afr gauge tells you is your air fuel ratio lol. if my gauge starts reading funny im not going to assume or think that my o2 sensor is going bad, imgoing to think the afr sensor is going bad.