CL max load limit tables

nindoja

nindoja

Greenie N00B Member
@Enki @VTMongoose - Here's the thread I said I'd make about the CL max load limit tables.

Background: VT and ATR have three CL max load limit tables that we believe are used to allow the ECU to trim fuel even when in OL conditions so long as the load is below this amount. These tables were the source of the great "AP 2.5 load limit glitch" from a year+ ago.

Hypothesis: The best MAF calibration approach would be to:
  1. Do the normal idle/CL maf calibration
  2. Set the CL max load limit tables to the CL->OL load threshold values
  3. Do WOT pulls and calibrate based on the values seen in the logs
  4. Set the CL max load limit tables to unreachable loads
In theory, this should result in the ECU hitting targets reliably with an additional 10% it can trim either way. Side note: @Chaser27 tested the trims on a PU and said he saw upwards of 15% trims, but that's not the point of this thread.

In reality, I've not seen that. Attached are 2 datalogs taken from my AP. When I ported my map to VT (partial port, anyways), I saw the same behavior.

datalog1.csv was taken with the CL max load limits matching my CL->OL transition tables. datalog2_trimmed.csv has the CL max load limits set to 3.0 and the AFRs go crazy.

Thoughts?

@steve@versatune @ugnius@versatune @phate @AYOUSTIN - Y'all might be interested too
 

Attachments

I'm a tad confused by your results. Unless I'm thinking about this wrong, your results show the opposite of what should happen. If you raise the limit to 3.0 your fueling shouldn't go all scattered like that until you're past 3.0 load.
 
The second log shows you hitting some kind of cut; I'd be interested in seeing your map for VT; might need your install as well depending on car year.
 
Enki said:
The second log shows you hitting some kind of cut; I'd be interested in seeing your map for VT; might need your install as well depending on car year.
Click to expand...

I will post up the map tonight. Its for a 2006 MS6. As for the cut, that was a problem with me not setting one of the load tables high enough.

I'll try to get another log tonight now that that has been fixed in the tune.
 
Haven't forgotten about this. Went to drive the 6 today and got christmas lights all over the dash. I think one of my ECU cable connectors is borked :(
 
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