e38 ECU information

[joecar]

Simon, is there an E38 pid to show the equivalent airflow calculated from VE...?

[ e.g. in LS1 the DYNAIR pid in most cases it tracks the MAF pid ]

[swingtan]

E38.APCYL_DMA gives gm/Cyl

AIRPERSEC gives gm/Sec ( not that I've logged it though )

I set up a CALC PID a long time ago and normally use that to show gm/Sec from the E38.APCYL_DMA and RPM

[gmh308]

In Scan & Tune for BBL it is called MAFSD. MAF Airflow - Speed Density. GM calls it SD MAF.

[swingtan]

that as well..... :p

[joecar]

In Scan & Tune for BBL it is called MAFSD. MAF Airflow - Speed Density. GM calls it SD MAF.

lol, interesting.

[snax]

Finally some good progress

Disabled fuel trims, left MAF plugged in and enabled. logged a few drives and WOT pulls. made adjustments to the VVE table 8101 with good results. Im going to attach the last datalog and tune file for you guys to review. Its rich in some areas and WOT is still rich but im working on it. Anything else you can see in the log that I need to work on

Log_0008.efi
c6 z06.tun

Thanks again swingtan and joecar...Finally getting the hang of this

[swingtan]

If the MAF is enabled, then there will be no point in adjusting the VVE at WOT and little use while cruising. The E38 will use the MAF signal only over 4000 RPM and will cross compare the VVE at any RPM under 4000, so changes will make little real effect. You can adjust the MAF tables though and they should have a much greater effect on the final fueling.

BTW, try disabling spark smoothing ( B0301 ) , it may help with the timing being pulled while cruising.

Simon

[snax]

If the MAF is enabled, then there will be no point in adjusting the VVE at WOT and little use while cruising. The E38 will use the MAF signal only over 4000 RPM and will cross compare the VVE at any RPM under 4000, so changes will make little real effect. You can adjust the MAF tables though and they should have a much greater effect on the final fueling.

BTW, try disabling spark smoothing ( B0301 ) , it may help with the timing being pulled while cruising.

Simon

Does the MAF table adjust the same as the VVE tables. If the mixture is rich then I should Lower the MAF values?

[swingtan]

Yes. You will need to cross reference MAFFREQ2 and the WB BEN to get an accurate adjustment, though with the log you have, you could just add / remove 5% in areas to flatten the WB reading off a bit.

Simon

[snax]

Todays lesson is...returning engine to idle!!!

The car wants to die when you shift into neutral coming up to a stop light. You can see it best in the following datalog at around frame 455. Alot of the time the revs will hang around 1600-1700rpm for an excessive amount of time before it returns to idle speed, ~850ish. You can see the revs hanging up at around frame 420.

What tables should I be looking at for the idle issues?

Log_0010.efi

Thanks,
Bryan