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Author Topic: Overrun Flames, Gargle, Pop  (Read 227255 times)
totti
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« Reply #585 on: August 13, 2021, 03:35:32 AM »

Hi,

I have a custom code for Pops&bangs. The code is writing 2 variables: zwout and nwe. Are these variables enough? As I read the topic KFNWEGM should not be modified. KFNWEGM->nwe with some offset so the code should change other variable for Pops&bangs?

Thank you
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Josh_ox3
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« Reply #586 on: August 13, 2021, 03:22:00 PM »

Hi friends, a simple question about your experience. Pops and bangs are an effect of unburned fuel and timing retard in a hot exhaust. But my consult is how is your experience  in terms of RPM and ignition timing retard for pops or bangs? Of course every engine / platform / millage is different.

MED9.1

Data log lift off load, mine was 18.X I believe, so second lowest load line I set to 19 and put -20 in the required area (4500-7000 RPM)

Don't change KFTVSA or the car will drive itself due to not shutting off injectors.

You'll still get for example when you let off the throttle, 0.83 lambda, 1.00 lambda (pops) then 1.99 lambda when they shut off, so a few seconds at 1.00 with lift off pops and no driveability issues.

-18 was gargles, -25 was pops, -35 was abnoxious bangs.
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Jannik07
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« Reply #587 on: September 13, 2021, 01:28:39 PM »

hello guys,

anyone has an idea how to call later igniton angle than about -24° ?

I set all maps to -50, but from logs I see only -24°. Is there a hard limit or something?
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bamofo
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« Reply #588 on: September 14, 2021, 07:06:05 AM »

hello guys,

anyone has an idea how to call later igniton angle than about -24° ?

I set all maps to -50, but from logs I see only -24°. Is there a hard limit or something?

Yes you also have ot make sure under the ZWMIN section that you turn those down accordingly or it will never go below that.
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Jannik07
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« Reply #589 on: September 14, 2021, 08:49:00 AM »

Thanks for your answer,

I've read that section a few times. But I can't find any limitation in there that limits me to -24° :/
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fukenbroken
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mk4 1.8T AUM


« Reply #590 on: September 14, 2021, 09:59:01 AM »

1 st page
Kfzwop
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Jannik07
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« Reply #591 on: September 14, 2021, 11:03:17 AM »

I lowered it already to 0 degree. Thats the min value possible in that map..
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justinvw2646
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« Reply #592 on: September 14, 2021, 02:57:47 PM »

I logged ignition timing on an APR tuned golf R the other day that I had put an engine in. Lots of pops and bangs in the tune on overrun….that said ignition timing never went lower than -22.5 degrees on overrun.
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Jannik07
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« Reply #593 on: September 15, 2021, 12:43:40 AM »

Yes the car pops already quite nice. But id like to have full control. And play a bit with it Smiley
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eliotroyano
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« Reply #594 on: September 15, 2021, 11:33:56 AM »

MED9.1
Data log lift off load, mine was 18.X I believe, so second lowest load line I set to 19 and put -20 in the required area (4500-7000 RPM)
Don't change KFTVSA or the car will drive itself due to not shutting off injectors.
You'll still get for example when you let off the throttle, 0.83 lambda, 1.00 lambda (pops) then 1.99 lambda when they shut off, so a few seconds at 1.00 with lift off pops and no driveability issues.
-18 was gargles, -25 was pops, -35 was abnoxious bangs.

Thnaks for the comment, you got my point. At low-mid rpms is easy to get any style you want but and high rpms (4000+ rpms) is difficult to obtain loud pops or bangs. There is where some info will be nice. I have test from -15 to -35° of ignition timing with no more than gargle and some pops eventually.
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Jannik07
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« Reply #595 on: September 16, 2021, 06:49:40 AM »

Yes the car pops already quite nice. But id like to have full control. And play a bit with it Smiley

I digged in the FR again and I found that zwout has Hard Limits (SY_WMIN and SY_WMAX) SY_WMIN is Set to - 24 and cant be changed. If anyone has another meaning I would like to hear it Smiley
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