Been out of the game a while, watching some recent tuning vids, things have changed?

[TTVert]

I don't see mention of anyone moving the high octane spark table to the low octane table. I see nobody setting Open loop EQ ratio to 1.00 across the board to ensure there is no multiplier based on ECT (I know this won't skew logs but see my rationale below). They just fail the MAF, disable COT, DFCO, dynamic airflow and the fuel trims.



Have things changed or are these things just not being mentioned? Granted, I know i'm comparing commanded vs. actual AFR so the EQ ratio really is irrelevant but w/ it stable at 14.63 i figured it'd be easier on these than trying to tune based on varying EQ ratio due to ECT.

Thanks
Dave

[5FDP]

Doing those things all depends on what you are trying to do.

A stock OS that has the MAF failed for VE tuning needs the High/Low octane tables copied so that is runs the timing you request. Then you revert back to lower timing on the low octane table once you are done speed density tuning.

The Open Loop EQ Ratio doesn't need to be set to 1.00 for all cells. During warm up being richer is just fine and then just have it set to 1.00 above 130 degrees where you are doing your MAF/VE tuning.

[TTVert]

Doing those things all depends on what you are trying to do.

A stock OS that has the MAF failed for VE tuning needs the High/Low octane tables copied so that is runs the timing you request. Then you revert back to lower timing on the low octane table once you are done speed density tuning.

The Open Loop EQ Ratio doesn't need to be set to 1.00 for all cells. During warm up being richer is just fine and then just have it set to 1.00 above 130 degrees where you are doing your MAF/VE tuning.

Sorry I should have been more specific, this is for VE tuning. So it seems nothing has changed there but people in videos tutorials I watched to see if there any new revelations don't ever mention the timing table which I know used to be a thing (Which it still is apparently). The vids I watched were cuts but straight through vids that for the most part were very good step by step VE tuning. Shocked it wasn't mentioned on the ones I watched and figured things had changed.

Dave

[mbray01]

Most of this is not being discussed, because the software is better, there is access to better histograms, and filters. When done correctly there shouldnt be a ton you have to dom in order to log. The less you change up front, the less you have to revert when done!!!! Its also worth mentioning that most tuners want to log real world environments, so changing all that has to be accounted for on the back end.




EDIT-REALIZED THIS POST WAS OVER A YEAR OLD

[marksrig]

I never quite realized why people copy the high octane to the low octane table. If you're not getting knock, the ecm wouldn't use the low octane side to change timing, right or am I missing something? I never changed them and havent had a problem.

[blindsquirrel]

When tuning VE, failing the MAF makes the PCM default to using the low octane table. It's supposed to be a temporary thing that's changed back after tuning. Using any of the custom OSes makes it not do that anymore so both tables keep working like normal whether the MAF is failed or not and the tables don't need to be changed.

[marksrig]

When tuning VE, failing the MAF makes the PCM default to using the low octane table. It's supposed to be a temporary thing that's changed back after tuning. Using any of the custom OSes makes it not do that anymore so both tables keep working like normal whether the MAF is failed or not and the tables don't need to be changed.

Strange, maybe on some ECMs. My E67 doesn't and it's stock

[blindsquirrel]

E67 is not a PCM, this is the Gen 3 section.

[mbray01]

when tuning ve, failing the maf makes the pcm default to using the low octane table. It's supposed to be a temporary thing that's changed back after tuning. Using any of the custom oses makes it not do that anymore so both tables keep working like normal whether the maf is failed or not and the tables don't need to be changed.

but why bother changing it, when tuning fuel, timing isnt going to play a big enough roll to affect anything. My point is why change it, when its not necassary to, and then have to remeber to change it back

[marksrig]

E67 is not a PCM, this is the Gen 3 section.

Sorry, silly me

[blindsquirrel]

but why bother changing it, when tuning fuel, timing isnt going to play a big enough roll to affect anything. My point is why change it, when its not necassary to, and then have to remeber to change it back

No I agree, that's just the explanation for why people were doing it. Or what it is that causes it to revert to the LO table.