So I'm looking to see what people feel the perfect AFR map would look like. Not the map that you program in - BUT the map created by logging. Basically what AFR values do you want your car to run...

I use an excel spread sheet that takes current map values, logged values, and desired map values and then compares them to create new values to load in for adjustment. So for this discussion the focus is on the "desired" values map.

Here's what I'm currently using as my desired AFR's, lean spool is off. What do you guys think.



Some images of the spread sheet.





My thoughts on the load map... I don't feel spoolup is shown very well on this as it doesn't continue into higher loads. But I made this a while back and don't want to redo it So it's just a general roadmap.

 

your desired AFR map is almost identical to how I would have set mine set up, except I would have dropped AFR @ 4000 to 11.5, and I would have leaned it out a bit @ 2500/100 load.

Wouldnt that be nice if your AFR map was really desired AFR, not just a value, the ecu interpolates?

 

it can be if your maf is rescaled

 

jid don't agree with your how you see load as you can have high load at small throttle openings too.
but i understand your logic

 

OP looks nice, although you'd expect there to be 1 or 2 safety columns that include overly rich cells for overboosting accidents, etc... if only usually hit 320 then maybe have 330 and 340 that are 0.5 and 1.0 richer respectively

 

I run my car a lot leaner under the lower load stuff as I'd rather keep it lean and drop timing under those conditions. I'm also running a factory block, so what works for me may not work on your build. But really consider what your car is off boost. It's a low compression, small cam 4 cylinder. It's an 80HP turd in other words and it doesn't need to be ran that rich to keep it safe. It's like the lean burn hondas of the '90s, they run those things at 14.7:1 under almost all conditions because they move so little air they don't generate enough heat to hurt anything.

Under 160 load I'm in the 12s or leaner on 91 octane. At 100, I think I'm running mid/high13s and I smoothly transition as the load increases. Lower RPM I run leaner, midrange is richer, the high RPM is richer still. Not a huge change though, 0.1-0.2 is all. I hold AFR pretty constant regardless of load once I'm above 200ish. If you find you have to pour on fuel to keep things from setting off the knock sensor, it probably means you are running the setup too hard. Even on 91 you can run some pretty intense boost without running anything richer then ~10.7:1.