What kind of changes are needed to run speed density

[bwelch]

I have a 04 gto with afr heads fast 92mm intake comp cams 238/242 605/609 111 lsa 6 speed with 3.91. I am thinking about going mafless. What changes do I need to make on my tune to do so.

[limited cv8r]

I'm pretty sure the "auto VE" tutorial explains the steps to run mafless, plus other things.

[SSpdDmon]

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

[bwelch]

Thanks for the help.

[terryr85]

is it really that easy?

-sorry for diggin up old crap

[5.7ute]

Pretty much. If you arent using a COS you need to paste your high octane spark table to the low octane table since a fail mode kills the HO table.
Also if you are running an auto you need to prevent excessive line pressure etc, which again is caused from the pcm seeing a maf failure. These are in tables E0102,E0103 & E0104.

[Sid447]

..........Also if you are running an auto you need to prevent excessive line pressure etc, which again is caused from the pcm seeing a maf failure. These are in tables E0102,E0103 & E0104.

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?

[joecar]

Sid, those only apply to A4.

[Sid447]

Hello Joecar

Yes understand! But I'd like to broaden my horizon. Is there somewhere I can read up on this a bit more?

[joecar]

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

Edit: link is now fixed... sorry about that...