Return to Closed Loop?

[joecar]

BTW(unrelated): set B3609 to all zeros.

How much was the initial bump up of the VE table...?


This is an LT1...? How big is the motor and cam...? What other mods...?

[5.7ute]

There is a bit of a trap involved in just raising the whole table in some OS's.(like this one appears to be). Since over 4000RPM is usually uncalibrated due to the maf taking over at this point. The 4000 RPM band gets jacked up during AutoVE due to interpolation with the lower 4400 RPM band.

[DPS]

BTW(unrelated): set B3609 to all zeros.

How much was the initial bump up of the VE table...?


This is an LT1...? How big is the motor and cam...? What other mods...?

I started with a 15% increase of the VE and went from there.

Mods include:

Hotcam - 218/228, 525/525, 112 .....unsure about rocker ratio

Mildly home ported stock heads

Longtubes

Moroso/K&N CAI ?

Edelbrock TB

No cats into a bullet style muffler

Those are the highlights. It makes decent torque. I rather like it.


Yes. It's a stock bottom end LT1

[DPS]

There is a bit of a trap involved in just raising the whole table in some OS's.(like this one appears to be). Since over 4000RPM is usually uncalibrated due to the maf taking over at this point. The 4000 RPM band gets jacked up during AutoVE due to interpolation with the lower 4400 RPM band.

Is hand smoothing the 80kPa and below values to trend more like the 85kPa and up values beyond 4000rpm the proper way to fix this?

Thanks for the tips guys!

-Brad

[5.7ute]

Is hand smoothing the 80kPa and below values to trend more like the 85kPa and up values beyond 4000rpm the proper way to fix this?

Thanks for the tips guys!

-Brad

Pretty much. Your 4000 RPM values appear to be jacked up due to the low 4400 RPM row. But this will clean itself up once you do another tuning run.
Another tip is to try & hit the centre of the cells, especially with the rpm bands. For instance I will set cruise control to 2000 RPM & use the terrain to vary the map cells to do this band on road. Not as good as a dyno, but it gets you there fairly quickly.

[joecar]

Brad, can you post some very recent log files...

[DPS]

Here is a log file based on the 0015.tun that I posted previously.

I've also attached 0016.tun that has the changes implemented that were suggested by you guys.

Please take a look and tell me if it's worth flashing 0016.tun to the car before it leaves. I will not get a chance to log or re-tune anything before it goes.

Thanks again guys!

-Brad

[WeathermanShawn]

Something still looks amiss..at least on my Scan Tool.

I see you want it to go to closed-loop, but your Scan says it stays open-loop the whole time? Also, it looks like one or both your O2 sensors are not working. H02S11 stays flat-lined. Furthermore there are no LTFT or STFT's..

But I see in your tune you have those enabled.

So, it still looks like SD-Open Loop..I am confused also...

[DPS]

What you just described has been the problem right along. I wanted to put it into CL but for some reason it wouldn't switch over. Perhaps it is the O2 issue that you discovered.

I was going to give the car a final flash tonight before it leaves in the morning as a last ditch effort to put it into CL. Since I have little confidence that it will work, I've been massaging the VE Table (97 Z28 0016.tun) per 5.7Ute's advice. That way if it stays in OL I will have a little more confidence in it.

-Brad

[mr.prick]

Clear the DTCs you have and try again.