$ee lt1 tuning cruise and idle

[zoomo]

Well good update, tonight i re-did my exhaust where my wideband was located because it was slightly smaller than the rest, and i welded it with a gasless so it was horrible.

long story short, at cruise i now get a reading of about 15, much steadier than before, and at idle it hangs around 15 -16 as well. so that makes me feel a lot better, and kind of makes everything make more sense.

now heres a log i took earlier this week, i think everything is looking pretty well, but if anyone has time to look let me know if you see anything i should work on.

Also what other ways would yall suggest i try tuning the wot?
When i adjusted it with the two tables, pe vs rpm, and pe vs temp to get the ratio i wanted i ended up with the car running rich if i were to enter pe at like 3 quarter throttle.

[lionelhutz]

Set the tables so that you know what the PE AFR should be and then tune the MAF until you get that PE AFR.

Or, program it so that PE is not entered and tune it in closed loop. Be careful you don't lug the engine too much if you do this.

[steveo]

with a wideband, i had the best luck setting the entire open loop table to 13.5:1 or something around there, disabling both closed loop and PE entirely, and just do a couple runs. that's really safe (unless it's way off to start with), and usually enough to get the entire MAF table nailed quickly. the more data the better, i wrote my own analyzer for it.

[zoomo]

Steveo, do you use this method purely to tune wot or is this something for cruise as well?

I have already changed my maf about 10% lower from about 25 airflow to 50 (approximately) to get my blms good, if you watched my cruise log they seem good enough to me about 127-129 .

As of now the wot is adjusted 5%lower than normal on the pe vs wot table and 7% leaner in the maf table from about 100-300.

This has all given me pretty numbers on my wideband and cruising blms but I would like to work on making it better By tuning the wot and maf the way you guys suggest

[steveo]

you'd use that method to adjust base airflow, whether MAF or VE.

[zoomo]

So after I do this its still acceptable to change it a little if neccissary to get blms correct?

But also once I've done what you suggest, should I purely adjust pe air fuel ratio by the two tables it offers?

Sorry it takes me a bit for things to start making sense buta little at a time I'm understanding this tuning I believe.

Is there anything terribly bad with what I've dome as of now programming the wot air fuel ratio?
I will be correcting it but I'm going on a long trip tomorrow and just trying to make sure I don't need to spend tonight tuning ha.

[brian617]

The AFR values in PE tables are only accurate if your VE table is accurate (speed density) and your MAF scaled properly (airflow). the AFR numbers are a reflection of your base fueling. You can cheat by changing the AFR numbers, but your actual and commanded AFRs will never match.