Am I correct in assuming (in $6E - using the 6Ev011.ecu and TunerPro RT) that PE vs RPM is added to PE vs Coolant temperature? I've made some changes using that assumption to lean out PE a bit, and it drives fine, but I haven't been using our wideband, or even scanning it.
If it's not that way, there should definitely be some help note added to that .ECU.

 

Well, when I data logged it tonight, with 17-18% PE vs RPM and about 4% PE vs Ctemp, the logged A/F from the ecu said it was commanding a 13.0:1, which doesn't quite jive with the PE. I looked at it in hex and it still equated to about 17-18% i.e. 150/128 = 117 and 14.7/1.17 = 12.56.

On every car that I've calibrated with our EFI system, (which are mostly 4 cyl TBI cars, which can sustain 14.7 at WOT - and we have block learn so the test can be back to back no problem), when 17% PE is added, it goes directly to 12.5:1, give or take a smidge.

Is there an error in the datastream? Or am I calculating things incorrectly? Or is there another factor involved?

 

You got the correct 2 tables for PE/WOT, but the calculation for the AFR is a bit more complex. Do a search on these boards for the answer posted by Traxion. He posts at least 2 different methods to calculate the AFR. But they both give very similar results.

 

I guess this means that the .ecu is mislabled. I'll see if I can get it back to normal tonight. I'm doing the math right now, and can assure you that 14.7/13=1.125 AND (150+10+128)/256=1.125, SO I'm right in that the .ecu is wrong! (not shouting ! just happy I found the discrepancy).
Thanks for pointing that out to me about the calculation. I found it here https://www.thirdgen.org/techbb2/sho...hreadid=214156 as you said, and it jives with what my display was showing in $6E also.

 

OK, got it now:

For PE vs RPM
Multiplier = .390625
Offset = -50

For PE vs Ctemp
Multiplier = .390625
Offset = 0


This way, if you add the numbers they will total the total added percent. So, if you want 12.5:1, you simply take 14.7/12.5*100-100=17.6%, and the two PE's must add to 17.6%.

If you want 13:1, take 14.7/13*100-100=13.07% total PE.

Cool eh?