What kind of changes are needed to run speed density

[5.7ute]

Learn something everyday!

I didn't know about these (I'm M6) are these changed to Yes? Maybe there's a thread explaining this a bit more?

Change these to No to disable max line pressure.

[Slowrc]

SD changes required:

Flip MAF Fail frequencies: C2901 & C2904 (low becomes high and high becomes low)
Change Fail Limits to 1: C2903 & C2906
Copy High Octane Spark to Low Octane table
Change MIL Enablers C6002: P0101, P0102, P0103 = No MIL
(Don't change Processing Enablers)

That will put you in SD.

If you were going to tune with a WBO2, you would also want to go open loop.

Open loop tuning changes required:

Disable LTFTs - B3801
Disable STFTs - B4205 (set all to 283*F)
Adjust Commanded Fuel in Open Loop table - B3605 (set all rows 158*F and greater to stoich)
Adjust PE Based on RPM table - B3618 (set as desired for WOT)
Adjust PE Mode Enable - B3616 (adjust as desired by TP% & RPM when you want PE to activate)
Disable DFCO - B3313 & B3308 (set to 283*F)
Disable Cat. Overtemp Protection: B0701

WHY would you not disable processing enablers??? Please, I have trouble popping codes for mil"s I have set to No mil

[joecar]

If you disable the processing enablers, then the MAF DTC's will not be triggered...

If the PCM does not see a MAF DTC, then it won't go to SD (VE only) mode...


i.e. when the PCM sees a MAF DTC, it fails over to SD mode.


i.e. the presence of P0101, P0102, P0103 signifies that the PCM is now running is SD mode.

[Sid447]

This is all we have so far: showthread.php?t=10773

Change these to No to disable max line pressure.

Thanks "Joecar" & "5.7ute."

[N0DIH]

What is GM's reasoning for the MAF tied to the transmission pressures?

I don't see the need. Isn't TPS fine for it? Or does it really use Calc Load and that is thrown off without a MAF so it goes max hard to make up for the lost value?

[joecar]

If airmass calculation is low, then commanded transmission pressure will be low, this allows clutches/bands to slip during high torque.


airmass -> calculated torque -> commanded line pressure

[N0DIH]

Are there any tables for it? On my L67 (3800 SC) I am on MAFless and having no problems with the trans with no MAF. All I can do is unplug the MAF and set the MAF Fail Low freq to 0.

If airmass calculation is low, then commanded transmission pressure will be low, this allows clutches/bands to slip during high torque.


airmass -> calculated torque -> commanded line pressure

[joecar]

Look for P0101,2,3 in tables E010x.

Some vehicles have those set to No

[N0DIH]

I set mine to NO when I killed off the MAF. It was bad and I figured it was a good time to tune without it and see.

Only problem I have is low airflow at low speed it stalls sometimes. I can't figure out what is up, even when driving, it almost seems like DFCO is set to aggressively. But it is set stock.

Look for P0101,2,3 in tables E010x.

Some vehicles have those set to No

[wesam]

SD changes required:

Flip MAF Fail frequencies: C2901 & C2904 (low becomes high and high becomes low)
Change Fail Limits to 1: C2903 & C2906
Copy High Octane Spark to Low Octane table
Change MIL Enablers C6002: P0101, P0102, P0103 = No MIL
(Don't change Processing Enablers)

That will put you in SD.

If you were going to tune with a WBO2, you would also want to go open loop.

Open loop tuning changes required:

Disable LTFTs - B3801
Disable STFTs - B4205 (set all to 283*F)
Adjust Commanded Fuel in Open Loop table - B3605 (set all rows 158*F and greater to stoich)
Adjust PE Based on RPM table - B3618 (set as desired for WOT)
Adjust PE Mode Enable - B3616 (adjust as desired by TP% & RPM when you want PE to activate)
Disable DFCO - B3313 & B3308 (set to 283*F)
Disable Cat. Overtemp Protection: B0701

could you illustrate this point
because in AutoVE tuning tutorial they did not say any thing about MAF low frequency