lean low rpm??!!

[nathans1987]

at low rpm i am getting a lean reading. i have done auto ve many times and it just keeps increasing it. from 800 to 2000 rpm my ve table is at 117 acording to auto ve and still lean at any map kpa.

[hquick]

Are you trying to do AutoVE with STFT's enabled? Semi closed/open loop?
You have a large majority of your commanded fuel table B3647 set to stoich.
Zero to 2400rpm is set toi stoich via your B3618 PE table also.

[nathans1987]

nope i am not useing stft running open loop. i set them to mostly stoich to try fix my problem. it used to run richer than commanded afr now thats its stoich its running leaner than commanded so the auto ve always over compensates. above 2400 rpm its fine tho. i didnt want my pe table to effect the stoich afr i wanted to test to see if that was the problem so i put it at zero untill 2400. i dont know much bout all this so i have to try stuff to learn haha maybe that was dumb move. i was thinking that maybe my ifr table is bad or wrong but i used the spreadsheet to calculate it and its fine above 2400rpm.

[joecar]

Some comments (not necessarily related to each other):

Set B3609 to all zero.

Hmmm... PE is not kicking in...?

When you set B3647 to stoich afr, then semi-open loop (SOL) using STFT's will kick in on those cells like Howard said, this will correct the afr to stoich and defeat your AutoVE objective.

In the tunetool, go Edit->Properties->Display and set:
- VE units to g*K/kPa... think of VE in terms of g rather than %.
- Fuel units to AFR... make sure you're not using Lambda.

Do you have boost...?

Is there a reason why spark timing table B5914 is so low...?

What vehicle/mods...?

[nathans1987]

actually i probably should make sure what i have in mind is actually STFT is that disabled by being in open loop? how do you normally enable it or disable it so i can check that i have.

[joecar]

Log shows WOT for 15 seconds but rpm rises by only 100 rpm...?

[nathans1987]

no i dont have boost just a standard ls1. i put the timing so low because i am getting knock detection at 50+ kPa in rpm range up to 2400prm.

is there a way to turn STFT off all the time? i dont think i am running semi closed loop i think that is disabled.

[nathans1987]

that wot is in 6th gear at 100km h probably was trying to get see if the knocking was gone.

[nathans1987]

ill try setting aft to somthing not 1 then see if that helps. will 1.01 do it?

[joecar]

Yes, set EQ ti 1.01 to avoid SOL.

[hquick]

Log shows WOT for 15 seconds but rpm rises by only 100 rpm...?

And commanding 14.63 (stoich) the entire time. Actually.....99% of the log shows stoich being commanded.

[nathans1987]

yeah i didnt realise what commanding stoich did. i'm new to this. i changed it off stoich and it fixed my problem. thanks all.

[hquick]

Cool! Glad you got it fixed.

[joecar]

Cool...:cheers:

I'm moving this to the COS section if that's ok with everyone.