Non lock up converter idle issue

[Dylan]

Usually best practice to match fhe idle area's to your idle table. So maybe bump up the 800 rpm 40-50 kpa to mid 20's them blend the surrounding area's smoothly. Post your bin if gou want I can do it wont take long.

[v8-tuning]

Like this?

[Dylan]

Looks good how's the 3D graph look?

[v8-tuning]

Heres the spark map graph.
Atm its a work in progress nowhere near complete
but just couldn't get my head around the hunting issue.
Ive done a few mods mainly converter and getting
the time to tune my car is hard sometimes.
I think there's area's that can be improved and would
prob take more timing in some areas too also needs smoothing
out a little.
I prob on spent 3 hours all up so far.
Might have a go tomorrow.
Ive also adjusted open loop afrs to 14.0 like holden 202 said
hope it works!

[Dylan]

What code base are you running? $12P or $DB etc.

[v8-tuning]

$11 vr/vs code 4l60e nothing special .

[VL400]

Blms aren't really changing a lot even with big fueling changes.
Tried going leaner then tried richer same thing just kept hunting.
Its around 13.5 afr atm.
I ended up disabling closed loop by setting the temp to max and problem solved.
Went for a drive and it drives perfect.
No idea why it does that in closed loop though.

This could be the issue, if you have 13.5 AFR open loop with a target of 14.7 the BLMs will be pulling fuel - which they are.

It enters closed loop, goes to -13 BLM which with such small injector PWs and double fire mode the RPM drops suddenly. Drops out due to something (BLM min RPM likely) and adds the fuel back in as BLMs return to 0% when not in closed loop. And repeats..

[v8-tuning]

Makes sense, so change the open loop afr closer to actual afr and it should stop it?

[Dylan]

If you change you open loop afr it will still be out. Need to adjust ve untill targeta and actual line up.
If you went to 11P and fitted a wideband we could get the fuelling spot on.
Then we could have a bit more of a play with the spark advance as well.

[v8-tuning]

Might give 11p a go.
Ill try out a few things with the current tune tomorrow and report back.
Got a wideband lm2 but not sure how I could wire it in?
Might get a permanent gauge for it.
Ive got an mtxl in my other car but open to any better suggestions.