GM TBI 383 $0D bad human memory need some guidance.

[383K1500]

Got it, thank you sir!

Can someone please verify my off idle and on idle VE tables? I know these are tied together in a certain way. I am open loop, my WB02 reads 13.5 from idle up to about 1650 rpm then leans way out. Maybe I have another issue but I am suspecting my tables. If these look ok I would appreciate any suggestions as to what I may look at. If I wing the throttle to about 2400 and hold it my WB is at 12.7, as I slowly close the throttle it gets really lean between 2000 and 1650.

I was going to attach an excel file but I could not figure out how to do it. Only the pics

on idle VE.PNG
off idle VE.PNG
thanks!

[383K1500]

Can someone please chime in on my prior post? Here is some additional information on what I have found, I unfortunately spent about 30 hours on this issue and have gotten nowhere, I would greatly appreciate some help. I do have short tube headers on this.
-Commanded open loop, all tuning done below sitting in the garage not on the road.
-Did some cold starts and tuned the choke with the WB
-Tuned BLM's several times open loop
-Engine still gets drastically lean around 1800 to 2000 rpm, if I wing the throttle and get it above 2000 the AFR is about 13.5
-I put it back in closed loop, and the 02 sensor totally messes things up, engine goes lean ~17:1 and O2 sensor swings are wild. If I wing the throttle it comes back but I assume that is only accelerator pump fuel.
I am suspecting the closed loop issue has to do with O2 sensor gains, thresh vs. airflow or one of the other O2 tables but I don't know if I am correct or which one I should start with.

thanks in advance,
Mark

[dave w]

Are you able to post the TunerPro RT data log ".xdl" file?

dave w

[383K1500]

Yes sir, I will pull something together.

[dave w]

The .bin file is needed also.

dave w

[383K1500]

Dave, here is the log file and bin. I noticed that when my WB02 reads ~13.5 the NB02 reads about 910mV. My map is pretty well tuned open loop sitting the garage out to 2400 rpm, in the 12's at the high rpm. Closed loop everything seems to lean out. I ran the log file steady at open loop then after closed loop I tried to gather data at several different engine speeds. At some speeds the mixture is closer to 14.7, some others it is very lean as you can probably tell by the engine temperature.
thank you again for your help it is appreciated!

[dave w]

Unfortunately, the data log did not have WBO2 data.

Link to my WBO2 Tuning Spreadsheet thread, with instruction for getting WBO2 data into the data log: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

dave w