have to bring this thread back to life...

I re-read the LS threads again, and decided to re-enable LS, after seeing that there is a better understanding of how the system works, and wanted to give it a try, again... Have any of you *LS gurus* had any time to play w/ the trailing time tables? Do you even adjust the trailing time tables, or just adjust the LS AFR mapping table? Any 1 care to share maps for a IX (0015)
Im using the LS AFR Mapping table that Merlin posted.

 

I adjust the AFR to make it not as aggressive. I believe 1 full point is too much. 1/2 a point will suffice. You just have to compensate with your fuel and timing tables.

 

If I've been tuning with LS (or whatever it really is) enabled, what tuning changes would I need to make when disabling it? I believe I would need to richen up the >2500RPM and >100LOAD area, correct? Any tips would be appreciated.

Also, what is the Lean Spool Load Threshold table? It doesn't look like I would think it would.

 

If you disable Lean Spool, your AFR's across tha map will become richer about 1 full point and you will need to readjust it.

Lean spool load threshold is load below which LS will not activate.

 

So is it safe to just turn it off and make a WOT run? I should be fine if its just going to be 1 point rich, right?

 

It general significantly richer AFRs will reduce power, and may foul your plugs.

It depends on the previous tune, if it was about 11,5 at wot, 1 full point richer afr should not do any harm to your engine, from a couple of WOT runs.

 

Bring the thread back from dead, lol.

im tuning the LS feature after finishing the tune on my 05 MR. couple ??

Right now with LS disabled im at 13.0 tapering to 12.0 during spoolup to ~3500 and between 11.8 to 11.3 to redline. Car is responsive with 20 psi at 3300 going to 25 psi at 3900 which i taper to 22 at 7000. See sig for mods. only 1 -2 knock counts between 3000 and 3600 and nothing up top.

Im using Merlins values in the LS AFR MAP table.

#1 should i get the main map a little richer say 12.5 tapering to 11.8 in spoolup and 11.5 to 11.1 to redline?

#2 has anyone tweaked the LS trailing time tables to good effect or should i just leave it alone?

Thanks for looking....

 

Reducing both the timer tables will reduce the time the ecu stays in LS mode AND the time it will take to get back into LS mode.

So the first table in the sequence is the LS decay table ie how quickly the ecu reduces the LS effect and runs on the fuel map directly.

The second table is the time for resetting LS, but in order to reset the engine load has to be above the load threshold, which is the third table in the sequence. And it has to be knock free to reset I believe.

The last table is of course the AFR mapping table, as described above/previously.

As a general comment on Mitsi thinking, I have noticed that roms for markets with higher octane fuel typically have longer decay time, but not like twice the time.

With a high octane fuel like e85, which typically does not mind running lean in an 4G63 engine anyway, the time decay table can be stretched out further than with gasoline - to good effect.
But dont go nuts with this and I would not use it on a track car.

 

thanks Merlin !

DD on 93 octane gas only but i will leave the trailing times alone, methinks. Re-focusing on the LS AFR mapping alone.

Milburn

 

A question just occurred to me after comparing the LS AFR tables between the earlier Evo 5/6 & later Evo 7/8/9. In earlier E5/6 roms the table is RPM vs AFR while in later roms it's base AFR vs LS AFR. Putting the two together, it seems that the earlier table is missing the base AFR reference while the later table is missing the RPM reference, does that make sense?
Is the later table subject to missing RPM values?
As an example, could the last column mean that LS would lean AFR by 1.3AFR (9.7 - 8.4) @ 7000 RPM?

 

That AFR table NEVER really had an rpm axis, just poor understanding from years ago.

LOL and it really was years ago now, at least eight.

More or less on topic, I got the TorquePro app working on my android a last week and got connected to my wife's Volvo XC60 3 litre turbo.
And guess what? It runs a version of lean spool as well.

I have also observed it in operation on a mates BMW six turbo.

 

So the later table is the correct one?
I still don't understand how would this table work without an RPM reference? Let's say I want to set LS to lean AFR by one point in mid RPM (3500-5500) and by half point at high RPM (5500-7000), how would I do that?

 

you cannot do that directly with Mitsubishi's arrangement.

You do have rpm start and end settings and the time decay setting with an rpm axis.
So to get the effect you have specified you have to manipulate the decay table, ie reduce the decay values above 4000 rpm.