Hey guys! This is my first time posting here, I have a 1996 Mazda Miata and I just recently installed an MS3 Base PNP and an AEM UEGO AFR Gauge. I am very new to tuning and have been doing a lot of research but I figured I'd get input from others to see how I can do better because I know I cannot make the best table there is. All I want is a reliable AFR table that I can use to tune my NA car until I decide to install a turbo; then I will get it professionally tuned. I figured it would be a waste of money to do that now and I could learn a thing or two. Thanks!

 

Naturally aspirated, you'll be at 100kpa when WOT, as long as you're close to sea level. That being said, your target is 12.2, but 12.5-13 is fine.

You're targeting 15 for gas mileage I'm guessing, but I would bump those up to the 3000 and 3700rpm column, not 2300 and 3000. Most gearing scenarios put cruise speeds (55-85) in top gear at 3000-4500rpm.

You could probably target closer to 14.5-14.7 at idle, depending on how good your injectors are, then interpolate between the idle columns and your cruise area, now need to dip into the 13s at partial throttle between idle and cruise.

WOT is a little rich, but it'll be good once you go turbo, so leave it. Boosted cells are a tad lean for my taste, but I tune a bit on the rich side. My thought is, if your wideband is off by .1-.2, then 11.8 becomes 12.0. If you target closer to 11.6, it's 11.8. My point is you're barely dipping into the 11s, maybe dip a bit more. I typically have my first boosted column at 12, and taper to 11.5 by ~15psi. Again this is probably rich, so play with it as you'd like. Your table ends around 14.5psi, so if you plan on going higher, you may want to shuffle rows around to add more.

 

Thanks, Curly! I'm not planning to go boosted too soon here so I decided to lean out the WOT and the idle to get better fuel economy. After doing a little bit of tweaking this is where I am at. Any takes?


Updated AFR Table

 

Still a bit rich at WOT, but better. Don’t be afraid to taper AFRs down as rpm increases. Most OE setups will be ~14.7 at WOT to ~13 by redline. Hell a 1.6 will run 15.5 to 11.8, but I wouldn’t recommend that. I’d especially taper the columns above/below your 15afr block, if you just tip past it or below it, you’re currently back at decent WOT AFRs while you’re only cruising.

 

Thanks again Curly! After a bit of tweaking here is where I'm at: I altered the high boost values (roughly 14.7 psi), smoothed out the values to WOT at atmospheric pressure, tapered the values as the rpms increased (except for deceleration zones), and I tapered the columns above and around the cruise areas.