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Author Topic: DSG DQ250 Tuning  (Read 190101 times)
Audirama
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« Reply #345 on: August 22, 2024, 11:47:30 PM »

Edit:  I properly rescaled KMFIOP and did KFMIRL to match it as inverse and this vastly improved drivability and even boost, however it did not fix my shift issue. Since the issue only happens in AMAX im pretty sure theres nothing I can do on the ecu side. I will keep digging
« Last Edit: August 24, 2024, 01:05:30 AM by Audirama » Logged
vkobzev
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« Reply #346 on: August 24, 2024, 02:52:59 AM »

Edit:  I properly rescaled KMFIOP and did KFMIRL to match it as inverse and this vastly improved drivability and even boost, however it did not fix my shift issue. Since the issue only happens in AMAX im pretty sure theres nothing I can do on the ecu side. I will keep digging

The mode AMAX is disabled by the card "Freigabe fьr den Schaltmodus 'Maximale Beschleunigung'"
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Audirama
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« Reply #347 on: August 24, 2024, 08:56:51 AM »

The mode AMAX is disabled by the card "Freigabe fьr den Schaltmodus 'Maximale Beschleunigung'"

Thank you for the help, I don’t want to disable AMAX unless I really have to. I tune my ecu but my dsg tune is from a company, now that I am running high power I am having an issue with AMAX where car won’t shift 2-3 it’ll over Rev and cut throttle. Very frustrating but only happens in AMAX
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untilnow
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« Reply #348 on: September 22, 2024, 05:04:12 AM »

The _slope_ of the line reporting torque needs to match the _slope_ of the actual torque. That is, if torque increases by 2x from point A to point B, the reported value also must increase by 2x or DSG is sad. Which usually means reported torque needs to be a line, or pretty close to a line, unless you're running your setup in some terrible inefficient area.

If you scale the whole line (ie underreport torque by 30% ACROSS THE BOARD), things continue to work as long as you re-adapt the DSG, although there is usually no reason to do this if you are competent and/or have access to a DSG ASW torque cap patch. If you flatten the top off (like most clueless tuners), everything breaks.

The absolute numeric values are not important on DQ250, the slope/gradient is what is important. The way the clutch model on DQ250 works is basically by picking two data points and drawing a line to determine the relationship between clutch engagement and pressure. The values that are used to draw the line are not important so long as everything is scaled to fit on that same line.

If I want to under report torque by 30% I could multiply the load axis of IOP by 1.43 (1/0.7)?

Isn't this the same egregious act as changing MDNORM?
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untilnow
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« Reply #349 on: September 29, 2024, 07:55:46 AM »

Yes, but "treat" is not the right word. 100% is MDNORM.
Also, the issue is that a lot of the stuff in the ECU uses torque internally, such as idle pid, friction torque etc.
Once you change your 100% to something else, you have to change everything else too.
It's kinda like 5120, just for torque.

DQ250 also can't really read higher than 630nm.

If I scale the KFMIOP load axis up so it is reporting less torque but maintaining linearity (I'm thinking *1.5 to go from 150max to 225max) surely the same rescaling of dashpot, idle PID etc is required?

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prj
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« Reply #350 on: September 29, 2024, 08:20:42 AM »

surely the same rescaling of dashpot, idle PID etc is required?
Yes
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untilnow
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« Reply #351 on: October 02, 2024, 08:24:36 AM »

Yes

Okay am I right here:

LLR = Idle Control Reserve; for managing extra demands of the engine at idle (power steering, A/C etc)
DASHPOT = Manages throttle angle smoothing torque transitions
Friction Torque = Manages the constant innate resistance of the engine itself in turning over
LSD = Huh Please help

I've found quite a few maps relating to these functions and am in the process of making a comprehensive list, translating from German to English is helping me find the maps that include torque.

Any help would be great  Grin
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prj
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« Reply #352 on: October 02, 2024, 10:34:31 AM »

That isn't an exhaustive list, not even close.
Every single torque value needs rescaling in ECU to do it properly, regardless if it's single value or a map axis/value.

You're not going to do that manually. A2L is needed and then some coding to automate the process.
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untilnow
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« Reply #353 on: October 04, 2024, 05:19:08 AM »

That isn't an exhaustive list, not even close.
Every single torque value needs rescaling in ECU to do it properly, regardless if it's single value or a map axis/value.

You're not going to do that manually. A2L is needed and then some coding to automate the process.

I've spent about 10 hours working on this since my last post as I really want to do this!

I've been using chatgpt (going round in circles) to help me parse the attached file.

(Won't let me attach for some reason)
https://file.io/2W7WJjC0N1Ll

As I understand it; in attempting to find "where torque is" I can use:

1. The scaling factor rel_uw_b100 as we know torque is a 0-100 value
2. The word "moment"
3. a chatgpt interpretation of the maps descriptions

I'm 99% sure there is a better way of parsing this file lol.

Please Mr PRJ, throw me some bread crumbs!
« Last Edit: October 04, 2024, 05:22:00 AM by untilnow » Logged
elias
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« Reply #354 on: October 04, 2024, 11:39:48 AM »

I can give you some breadcrumbs:
1. First get a A2L. this is a manual process as it involves a lot of asking ppl and ass-kissing the right ones. Someone may have one for this or a similar ECU
2. Then you could write some WINOLS LUA script which will remap all the values as you wish.
(You could do it with some code which will parse a2l, get all maps out and remap them, but WINOLS would be easier)
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untilnow
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« Reply #355 on: October 05, 2024, 05:37:08 AM »

I can give you some breadcrumbs:
1. First get a A2L. this is a manual process as it involves a lot of asking ppl and ass-kissing the right ones. Someone may have one for this or a similar ECU
2. Then you could write some WINOLS LUA script which will remap all the values as you wish.
(You could do it with some code which will parse a2l, get all maps out and remap them, but WINOLS would be easier)

1. I have the a2l, that's the attached file.

2. I know lol, I'm asking how to identify which maps need changing.

Thanks for the help though bro
« Last Edit: October 05, 2024, 06:50:57 AM by untilnow » Logged
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