I'm trying to figure out why my AFR goes rich at peak load (~3800rpm...almost a full point) then within a few hundred rpm goes back normal. My fuel map doesn't reflect this rich condition and leaning it out to correct this spot doesn't work and only cause a huge jump and inconsistency in my map.
I was seeking help in another thread in the general section but I figure this is where all the action is so I'll link to it:
https://www.evolutionm.net/forums/ge...nd-3500-a.html
Anyone help appreciated.

 

can you post a log of it? and can you post you fuel map?

 

Maybe your methanol?

 

Have you tried adjusting your fuel map leading up to that area? Sometimes the logs will lag behind, especially in rapidly changing situation like spool up. Try adjusting the map in the range of cells/loads before you see this in your logs.

 

Here is one of my earlier logs, it's not perfect but it clearly shows the problem:




I don't think its meth related because it happens on pump also. I've heard talks about the bov leaking at higher boost but I'm running the forge with the upgraded spring so I don't think that's it. At first I thought it was happening at the point that my meth came full spray but I've played around with the start/full spray settings on the controller but the rich spot doesn't move.

 

After seeing your logs and map, it looks about right to me.

Look at your fuel map just to the left of where you highlighted. You are coming through an area of 12.8 ish or so into an area of 11.7ish or so, then depending on how well you hold load (can't see in your log), you go back to an area of 12.4 ish or so. Just keep working on that transition and smooth it out.

Trace all of your load points and RPM on your map and you will see your path through it. Adjust accordingly.

 

are you talking about that little spot that it goes from 11.47 to 11.33 back up to 11.4? if so it doesnt really much look like a problem other than maybe needing a tiny bit more smoothing there

 

I think I'll give that a try but the only thing is that, even with the fuel table somewhat smooth, right before the rich spot it goes a tad lean (12.4 on the log) so I would have to take that into consideration too and readjust the entire spoolup area.
I've tried it with leanspool both on and off with the same results.

 

sorry about that I should have left the headings on...my wideband reading is in column K...I'm talking about where it goes 11.0 then back up. Which is actually one of the leaner runs, sometimes it goes 10.8-.9

 

I was actually looking at the wrong column as well, but I think my advice still holds true.

 

Please repost the log with all the headings visible.

 

I had to do that to keep the afr in check at that rpm/load...so are you saying that even though the log shows the rich spot happening at ~4000rpm/~300-320 load it could be that delayed that its actually occurring at almost 1k rpm earlier at ~260ish load?

 

Is column M AFRMAP?

 

sorry about that, should have done this from the start:

 

i think it would need to be at 12.2 or 12.3 to get it to where its supposed to be but since the afr seems to be in check before and after the rich spike i wouldnt change them to 12.2-3, but instead go with a 11.9-12.0 in those two cells. especially since its 12.0-11.9 before the 210-320 cells and then its back up to 12.0 after those cells.