NefMoto

I have fiddled a bit with overrun after i've gotten my car on the road again.
But i just can't seem to retard timing past TDC when fuel is being injected.
As soon as fuel cuts off i can get the timing to indicate 60 degree ATDC(not sure if correct)
I've read the FR and tried all the timing maps and nothing seems to get it past TDC with fuel,
but without fuel there is no problem retarding ignition.
i get a faint nearly inaudible burble and the occasional pop on shifts as it is now,
but nothing really substantial.

So if somebody can point me i the right direction it would be greatly appreciated :D

i digged a little deeper, and it seems that KFZWMS wont be used as long as B_sa=1.

Might be worth mentioning that im trying to achieve this without modifying KFZWOP.

So a little update on my "project".

So after fiddling with this with what little spare time I have
after becoming a farther.
I have come to the conclusion that ignition retard on overrun
can't be achieved without altering KFZWOP.

With that being said, it works as desired with altered KFZWOP.
now I will dive into fuel control on overrun since I'm getting a flat 1.36ms of injection time.
That results in a fat mixture and LOUD far apart bangs, and not the "classic" gargle.

TEMIN seems to have no effect on this, so I might look into trying FKKVS.

I appreciate this!! As soon as my f21 turbos show up I'm gonna give it a try.

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Maybe you have right about KFZWOP but I have one audi with bad thermostat and no matter what i do with fuel can't past TDC.
Thermostat was fixed so engine temp can rise up and car popping as should.

I have found the "WECIFI" function in the "ACIFI" module.

The map "FWEMXT" looks to be a factor of the max allowed fuel between 0 and 1.
It needs CWESWEZ bit 3 set to 1.

i have set the factor of "FWEMXT" to 0.85 from 86.25 degree C,
so in theory it will only allow 85% of the previous fuel to be injected in overrun.

I see FWEMXT and have set to 0.85 as you but missed set CWESWEZ to 08 so set it too and check :)

After a couple of days testing to see if any trims would have a influence.
I can conclude that it have had no effect on the overrun,
I still get the same flat 1.36 ms of injection time and have
the same loud, far apart explosion.

Guess it means I have to keep digging  :)

Are you trying to do decel (negative Timing) to get it to gurggle and bang?

Easiest way to do that is write some code on all the overall angle timing lookups and force it to what you want when the conditions are set. Subaru you just set the left hand column and off you go. another thing might be to hook in the cruise control so you can manage when it does it so you dont get pulled over... Lastly if its banging really loud then its still charging the coil fully.. If you share where your at (your rom) we can suggest. I could be wrong to, i am a lot as i learn... but i just worked on a project like this. Guess it depends on what ME your running on.

What to you try to achieve? My car normalny go ATDC when I'm in overrun and pop & bang as should. So what is problem in your tune?

I have timing retard working as desired.
The original goal was to get timing retard without altering KFZWOP.
But after trying everything I could think of,
I gave up and altered KFZWOP and it worked like it should.

Now I'm chasing control of the fuel on overrun,
since from what I can gather from things I've read on different forums
ideally the fuel mixture should be on the lean side to get the classic crackles
and a fat mixture will result in more aggressive and explosive overrun.

And from what I can see, when the car is in overrun the mixture is fat
and the injection time is locked to 1.36ms.

So I'm searching for the module that controls fuel on overrun,
thought I had it for a second but i guess not :)

I want to achieve a overrun that has the "subtle" crackle and occasional pop.
Not a explosion fest that could wake up a neighbourhood  ;D

Timing retards ignition fine now after I altered KFZWOP.
Just doesn't sound like i want it to.

What ECU are you running?

Thanks for ansfer. I'm running On 1ML906032 ECU. My car 1M1 Leon Cupra.
Ok maybe together we find solution.
What timing do you have?

Kfvakl kfbakl?

Have thought about trying KFVAKL, but is it active when B_sa=0?

I have subtracted 20° from KFZWMN/MS right at this moment.

What about KFLAMKRL?
ok I have modified KFZWOP/2 2 row and change axis to load on throttle = 0
first row from KFZW and axis load too
KFZWMIN/MS
 ignition is  -3 on 1280 RPM to -24 angle on 7000 RPM on low ignition I have nice gargle ( Max -10) on -15 and higher I have detonation pop

KFLAMKRL is only used when engine is retarding ignition when sensing a knock event.

Have you changed KFZWOP/2 and KFZW load axis or?

Don't change KFZW, it will have no effect on overrun ignition timing.

Right now I have all my overrun happening above 2500 RPM
so i can daily my car without pissing the entire city off.

KFZWOP axis low value from log when in overrun and map too
KFZW low value... For me has effect...didn't bumping ignition
Normally on longer pop time has:
Pop... Pop... Pop... Quiet... Quiet... Pop... Pop... Pop...quiet...quiet...pop...etc
When set first rów on KFZW same as KFZWMIN then have stable pop but must set first axis value as in overrun log and second a bit higher for normal operation.
Under 2500 rpm to ~1700 i have - 10° and lower rpm set to -8 go to - 3 when rpm is 1200 and have very nice gargle

Ok I do some test and my desired lambda is 0,9141 on overrun
only one map match to this setpoint
LAMRLMN is set to 0,9141 so I try to set it to 1 and see what happen

For me KFLAMKRL is that what I need. Lambda desired is as set in that map.
Yes it used for retarded ign but we have that for pop.
So lambda in my case follow as I set in that map

I tell you how I carry it in med 9 ....

In this way I have good pops overrun and from 3k down, the rpm drops gurgling.

I have to find out because when I change gears you can't hear the pops ... something interferes with the injection of gasoline. Why if I upload the KFNWEGM map to the maximum rpm. if pops are heard when changing gears ... if anyone has any suggestion. welcome.

did you log condition fuel cutoff? B_sa in ME7 maybe in ME9 too?
KFNWEGM is resume map engine speed so if you set to max rpm fuel isn't cut so something isn't set properly and fuel is still cut when the gear is changed

And for KasperH
I set KFLAMKRL map to 0,85 and ignition for -7 to -10 for normal drive rpm and car gargling as I want so try change it too

if in med 9.1 b_sa fuel cut condition is the same.
if I upload the KFNWEGM maps to the maximum RPM. If heard when changing gears. But if I apply the overrun configuration, no ... It only occurs to me to only raise the rpm to maximum gear 0 in KFNWEGM.

Unfortunately my car is off the road at the moment because of a split coolant flange :-\
I have a cast aluminium set on the way, but it wont be here until next week.

So i cant test at this moment, but i will try the KFLAMKRL map and see if my injection time changes :)
Although im not wanting a fatter mixture, it will be interesting to see if it has any effect.

Did you get anywhere with this? I want to change my overrun mixture aswell to get more of a crackle from the exhaust  ;D

Need to do TVSAG0 to stop fuel cut in N/gear change