Ignore my ramblings. They were totally wrong.
Have since worked out the right way to do it. Need to command Open Loop and will see how we go this time.
Printable View
Ignore my ramblings. They were totally wrong.
Have since worked out the right way to do it. Need to command Open Loop and will see how we go this time.
jsttry, do you have a wideband O2 sensor? A wideband is the key piece to performing the "auto-tune" steps.
One uses the wideband to measure commanded vs. actual air fuel ratios. This difference factor is then copied and pasted into the VE. When I've done the "auto-tune", the commanded vs. actual air:fuel ratio is typically in the 0.98 to 1.02 range which means my VE is +/- two percent off.
If you're using the LTFTs to tune instead if a wideband, copy and paste the table in sections - skipping over the cells with zeros in them. And save up for a wideband!
:wink:
This is very similar the method NoGo posted on LS1Tech. Worked pretty well for me. EFILive sure makes things easier and more exact (to boot)!!Quote:
Originally Posted by SinisterSS
Cheers,
joel
Should this be an average of both ltft bank 1 and ltft bank 2 not just 1 of the banks?
http://www.purplegto.com/files/veavg.PNG
Just checking
I'm new to this, so dont shoot me if I'm wrong, but I believe the "magic PID" is the Base Efficiency Numerator calculation for the various wideband sensors. This should give a VE multiplication factor for each MAP:RPM cell. Going to try it today :)
Great! Let us know how things go. :DQuote:
Originally Posted by Draco
Cheers,
joel
Well, my MAF is still connected right now but will be disconnecting it soon to do an SD tune. I have a Wideband Commander so I had to create my own AFR and Base Efficiency PID for this particular wideband. Here is a screenie of my MAP vs Base Efficiency numerator map, which can be pasted into my VE table as a factor to update the tune.
This seems so easy it makes me laugh out loud and wonder if I am doing this right or not.
Could someone please post the magic steps to performing this auto-tune? I have just recently gone MAFless and have some issues to resolve. I have some dyno time booked today and would really like to use this new functionality if possible.
I am already in SD mode, and have a WB02.
Is this tune done under normal driving conditions, that is without commanding the AFR to 13:1?
Does it have to be done in Close Loop?
Do you disable DFCO or Lean Cruise?
Would really appreciate it someone could enlighten me.
Cheers.
Not sure why everyone is saying you have to cut the factor and paste in groups.
I just did a complete block copy 800rpm - 6000, 15-105 MAP from scan to tune, just make sure you select the identicle cells from one to the other.
This ROCKS!!!! HpWHO???? lsWHAT??? ;) EFI!! EFI!!! EFI!!!!
Dang I was close doing it the old fashioned way. Had to just sit down and read the thread ( OVER AND OVER )
AAAAAhhhhh to bads its already so late I would go out and flash this puppy and go for a quick ride.
http://www.purplegto.com/files/new_ve_autotune.PNG
Haven't had a chance to "auto VE" my latest tune yet.
Attached is the BEN factor using one of my early tunes done the "old fashioned way."
Next time, the "new way" will be much faster and more accurate!
Looks like I need more data @ 8000 rpm. :D