ECMlink SD Idle help

[blizz99]

I've been trying to get my car idling correctly without any luck. I've been following a tutorial that's floating around here but can't seem to get the combinedFT and airflow/rev correct. Attached is a log of my idle, check it out and let me know what you guys think. My profile is up to date with mods.

 

[jrohner]

I would disable closed-loop. It's easier and quicker to tune by AFR's than with fuel trims.

 

[9!'clipseDOHC]

Is this the guide that you were looking at: http://www.dsmtuners.com/forums/articles-tuning-ecu/395564-how-tune-1g-v3-sd-ecmlink-no-maf.html? If not check it out, that is what I used and it worked great! Also check out this page first if you haven't already: quickieafsetup [ECMTuning - wiki] and watch this video: http://www.ecmtuning.com/demos/fueltrim.html.

Your CombinedFT's are high, ~10 (should be 0), so I would try increasing your global deadtimes to bring that down.

Also your AirFlowPerRev is very high, ~.50+ (should be more like .25 depending on your setup). You will need to adjust your SD table to bring that down. Track the datalog and adjust the cells that it is hitting at idle to bring that down. Lowering the number in the cell will lower your AirFlowPerRev. I would dial in the injectors and CombinedFT's first though as they are out of whack and that will effect your AirFlowPerRev.

Did you use the ECMlink SD cable or wire it yourself? If you wired it yourself and wired it to the Baro, did you use a buffer?

Is your AFREst and lining up with what is displayed on your wideband gauge? I see your AFREst is on the rich side but I can't see your wideband reading. You definitely need to make sure your injectors are properly setup and get them dialed in with the CombinedFT's.

 

[blizz99]

Is this the guide that you were looking at: http://www.dsmtuners.com/forums/articles-tuning-ecu/395564-how-tune-1g-v3-sd-ecmlink-no-maf.html? If not check it out, that is what I used and it worked great! Also check out this page first if you haven't already: quickieafsetup [ECMTuning - wiki] and watch this video: http://www.ecmtuning.com/demos/fueltrim.html.

Your CombinedFT's are high, ~10 (should be 0), so I would try increasing your global deadtimes to bring that down.

Also your AirFlowPerRev is very high, ~.50+ (should be more like .25 depending on your setup). You will need to adjust your SD table to bring that down. Track the datalog and adjust the cells that it is hitting at idle to bring that down. Lowering the number in the cell will lower your AirFlowPerRev. I would dial in the injectors and CombinedFT's first though as they are out of whack and that will effect your AirFlowPerRev.

Did you use the ECMlink SD cable or wire it yourself? If you wired it yourself and wired it to the Baro, did you use a buffer?

Is your AFREst and lining up with what is displayed on your wideband gauge? I see your AFREst is on the rich side but I can't see your wideband reading. You definitely need to make sure your injectors are properly setup and get them dialed in with the CombinedFT's.

Well, I just tried to adjust to get the CombinedFT and AirFlow/Rev but they aren't moving. I checked for boost leaks and fixed what I've found. Also, that is the tutorial that I'm using.

I'm using ECMLink SD cable with GM IAT and Omni 4bar MAP sensors.

The AFREst and wideband gauge are reading the same.

I guess I'm just having trouble dialing in the injectors. Help is appreciated

 

[ElectronVTEC]

What's interesting is the Wideband logged value is perfect, but you're saying the gauge and AFREst are matching, which is not perfect (13.2 to 1 based on what I'm seeing at some random point in the log). The things that jump out at me - but I haven't figured out why they're off - are AirflowPerRev at .55g/rev. That should be down around .30 with a 2.3 stroker motor. To get there, you'd have to reduce your SD table a metric ton at idle, however. TPS looks good, idle switch works, I don't see ISC but that's probably not the issue. It wouldn't be a bad idea to add it to your Captured Values though.

Brainfart - I'm running the same injectors you are. To get them to idle "perfect" i need a much lower global (around 52% if memory serves) and a bit more deadtime. Realize first that the values you find on the Internet and on ECMTuning's Wiki are good baselines. Now, to be fair, I think my set is either clogged or at best very dirty. I would be willing to bet if you drop global by 3% and up your DT value by 100 us, you'll see CombinedFT fall substantially. Try that and see what happens.

Edit - the AFREst and apparently your gauge are reading rich, so I'd be interested to see another log with the suggested changes to global and DT to see how those two things react. Have you compared your gauge with the A/F Ratio display in link to see if they match up well?