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Old Wed, Oct-08-2014, 09:20:29 PM   #1
m3new
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Default Mapping for Burble & Pops..

Does anyone know the location or the map name for the overrun fuel cut tables??

Ahem..Terra....SliM3..

KL_SWE_SW_DIFF??

Last edited by m3new; Wed, Oct-08-2014 at 09:43:59 PM.
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Old Thu, Oct-09-2014, 09:49:19 AM   #2
SchLanD
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Default Re: Mapping for Burble & Pops..

check the _SA_ maps SA=Schubabschaltung -> overrun


overrun is meaning turning off all injectors when you go off the throttle

I can translate some things for you:
K_SA_MD_HYS dynamic torque threshold for activation overrun
K_SA_MSR_SPERRZEIT disable overrun for x after some DSC things happend
K_SA_TKAT cat temperature threshold, before is no overrun possible
K_SA_WDK throttle threshold when injection will be turned off immediatly
KF_SA_TIME_TMOT_N40 delay for overrun triggering

There are 3 steps,

1. recognizing you to activate overrun
2. overrun-readiness (delay), and use a minimum of spark and fuel
3. activate overrun, by shutting down injection

K_TZ_SA_CONTROL configures if there should be spark retard for overrun 1 => active and 0 => inactive
but there will be still the torque manager which will control ignition

These are just some basic infos, i have to read more to understand it completely. But maybe this will help you.
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Old Thu, Oct-09-2014, 11:12:46 AM   #3
M3CARBON1
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Default Re: Mapping for Burble & Pops..

Thanks for this, but surely this method is overly complicated? I thought It should be as simple as changing the overrun areas in the base fuel map which are lean back to rich (as the pops come from un-burnt fuel in the exhaust) my understanding is NOT to cut fuel on overrun at all. As you wont get any pops that way..............

As I know it...dump fuel in all cylinders in overrun and advance ignition timing...In the same area's of both maps....

Last edited by M3CARBON1; Thu, Oct-09-2014 at 11:25:27 AM.
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Old Thu, Oct-09-2014, 12:01:20 PM   #4
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Default Re: Mapping for Burble & Pops..

Evolve can tune it in for you Be aware that it's very loud and violent.

Nothing like modern burble/overrun you find on F-type/M235i etc
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Old Thu, Oct-09-2014, 12:31:42 PM   #5
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Default Re: Mapping for Burble & Pops..

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Originally Posted by JuicyM3 View Post
Evolve can tune it in for you Be aware that it's very loud and violent.

Nothing like modern burble/overrun you find on F-type/M235i etc
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Old Thu, Oct-09-2014, 12:36:06 PM   #6
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Default Re: Mapping for Burble & Pops..

Quote:
Originally Posted by M3CARBON1 View Post
Thanks for this, but surely this method is overly complicated? I thought It should be as simple as changing the overrun areas in the base fuel map which are lean back to rich (as the pops come from un-burnt fuel in the exhaust) my understanding is NOT to cut fuel on overrun at all. As you wont get any pops that way..............

As I know it...dump fuel in all cylinders in overrun and advance ignition timing...In the same area's of both maps....
Why advance the timing ?

When we used to do this in the Evo's we would retard the ignition to get the pops and bangs.
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Old Thu, Oct-09-2014, 12:49:37 PM   #7
m3new
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Default Re: Mapping for Burble & Pops..

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Originally Posted by cossie1 View Post
Why advance the timing ?

When we used to do this in the Evo's we would retard the ignition to get the pops and bangs.
Retarding will give you a bang rather than a pop and crackle, burble...
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Old Thu, Oct-09-2014, 01:02:59 PM   #8
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Default Re: Mapping for Burble & Pops..

Quote:
Originally Posted by JuicyM3 View Post
Evolve can tune it in for you Be aware that it's very loud and violent.

Nothing like modern burble/overrun you find on F-type/M235i etc
Sorry, I don't know much about initiating this condition, but I'd take a guess that the reason why it's so violent is because this mod interferes with engine drag torque control (MSR). Not good if you visit the track every once in a while.
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Old Thu, Oct-09-2014, 01:10:42 PM   #9
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Default Re: Mapping for Burble & Pops..

Quote:
Originally Posted by M3CARBON1 View Post
Thanks for this, but surely this method is overly complicated? I thought It should be as simple as changing the overrun areas in the base fuel map which are lean back to rich (as the pops come from un-burnt fuel in the exhaust) my understanding is NOT to cut fuel on overrun at all. As you wont get any pops that way..............

As I know it...dump fuel in all cylinders in overrun and advance ignition timing...In the same area's of both maps....
But there is a misunderstanding, overrun areas are not lean in base fuel map, they are very rich, at least it does not matter because, injection is turned off instantly when you go off the throttle.

Easy way to make it burple is just to set K_SA_TKAT (default 10) to 1000, then injectors won't cut off. Try it, nothing should happen but a way higher fuel consumption.
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Old Thu, Oct-09-2014, 11:09:02 PM   #10
m3new
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Default Re: Mapping for Burble & Pops..

Quote:
Originally Posted by SchLanD View Post
But there is a misunderstanding, overrun areas are not lean in base fuel map, they are very rich, at least it does not matter because, injection is turned off instantly when you go off the throttle.

Easy way to make it burple is just to set K_SA_TKAT (default 10) to 1000, then injectors won't cut off. Try it, nothing should happen but a way higher fuel consumption.
I dont think so, the over run parts of the fuel map (top right) shows higher figures of 1.30...This is a LEAN figure..not rich...taking numbers away from this map adds fuel.....The same places in the base ignition map are way advanced...60 degrees...It makes sense....If not explain why?

If we can activate burble with K_SA_TKAT then why the need for all the other K_SA maps?

Last edited by m3new; Thu, Oct-09-2014 at 11:40:39 PM.
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Discussing Mapping for Burble & Pops.. in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)