MED 9.1 basics

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prj

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	Re: MED 9.1 basics « Reply #255 on: October 18, 2015, 01:25:09 PM »

Quote from: Nottingham on October 18, 2015, 06:47:02 AM

So you´re saying the post turbine temperatures at stock should be well below 650°C?
Sounds quite optimistic when considering the default turbo, downpipe and exhaust restrictions.

No, I am not saying that. Stock it runs lambda 1 or lambda 0.9 for a lot of time, so it hits 850C on a regular basis. And there is nothing wrong with that.
When tuning, you will be running richer lambda all around, so that should drop temps a lot already. But you do not want to exceed 850C post-turbine EGT for significant amounts of time, as it will cause cracks in the exhaust manifold, excessive wear on exhaust valves/stem seals and so on.

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Swapping S3 exhaust to the 3" non-resonated stainless exhaust dropped the back pressure even further.
Not that I have measured it, but the boost dropped quite a bit at the same WGDC.

Yes, exactly, you have not measured it. It is a good idea to do so.
That china turbo you are running can also have issues with cold/hotside balance. If you bundle an oversized compressor wheel with an undersized hotside, the result is surge and high EGT, as the turbine does not flow enough.

Anyway, this has nothing to do with MED9, it's just schoolboy basics of tuning ICE's.


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Nottingham

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	Re: MED 9.1 basics « Reply #256 on: October 18, 2015, 08:57:52 PM »

I´ll add tavhk_w (critical exhaust gas temperature before the main kat) RAM variable add check what it reads.
In FR Bosch uses 1200°C limit for taikr_w and 900°C for tavhk_w. VAG has set all the other limits to the maximum ~1263°C and only left TAIKRBTS active in this software (800°C).
And indeed even at stock the BTS is active as soon as you start driving.


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prj

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	Re: MED 9.1 basics « Reply #257 on: October 21, 2015, 03:12:46 PM »

Quote from: Nottingham on October 18, 2015, 08:57:52 PM

I´ll add tavhk_w (critical exhaust gas temperature before the main kat) RAM variable add check what it reads.
In FR Bosch uses 1200°C limit for taikr_w and 900°C for tavhk_w.

Default values set in the ECU when software is delivered to client. No production car uses these. Completely irrelevant.


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Nottingham

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	Re: MED 9.1 basics « Reply #258 on: October 28, 2015, 04:34:09 AM »

What would be the "usual suspects" for the requested load being underscaled?
KFMIOP/S and KFMIRL/S correlate perfectly and load in KFMIRL/S is sufficient.

Something appears to be scaling down the load starting from ~6000rpm.
KFTARX/B/ZK is fine and IATs are extremely low (<5°C outside).

KFFLLDE, KFFSLDE or KFFWLLDE are not the cause either.
KFLDHBN is sufficient too.

The turbo is good up to ~1.3bar at the limiter, however I cannot reach the requested boost due load being cut down and WGDC not raising to sufficient levels.
KFLDIMX doesn´t restrict the duty either as the limits are 5-10% higher the actual duty currently is. The linearisation from KFLDRL is not the cause since ldtvr_w and ldtvm are within 0.5% in the troubled areas.

P/I/D are effectively zero after the initial boost spike, as expected.

Suggestions for values to log are very welcome.


« Last Edit: October 28, 2015, 04:50:03 AM by Nottingham »	Logged

dream3R

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	Re: MED 9.1 basics « Reply #259 on: October 28, 2015, 10:01:33 AM »

I've never tuned med9 but what are the maf readings? DLDR? Throttle angle too?


« Last Edit: October 28, 2015, 10:27:17 AM by dream3R »	Logged

How to work out values from an A2L

http://nefariousmotorsports.com/forum/index.php?topic=5525.msg52371#msg52371

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noobs read this before asking http://nefariousmotorsports.com/forum/index.php?topic=9014.0title=

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I don't have ME7.01 A2L I just use ID

Nottingham

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	Re: MED 9.1 basics « Reply #260 on: October 28, 2015, 12:17:57 PM »

All of the figures are healthy, and it is nothing really obvious such as throttle closing or anything like that.
MAF reads around 254g/s @ 6700rpm, however I´ve already done much more than in the past.


« Last Edit: October 28, 2015, 03:17:14 PM by Nottingham »	Logged

dream3R

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	Re: MED 9.1 basics « Reply #261 on: October 28, 2015, 10:38:11 PM »

log DLDR then?


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Nottingham

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	Re: MED 9.1 basics « Reply #262 on: October 29, 2015, 06:42:35 AM »

It seems that the issue is caused by a torque limit.
The requested torque (misol_w) never exceeds 86%, so the requested load (rlsol_w) is infact correct based on the KFMIRL/S map.
Anything obvious which could cause this type of limit?

KFPED_0/1 is fine, MDIMX is fine, KLMIMAX is fine and I´m quite sure I have been able to reach higher than 86% of the maximum torque before.


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dream3R

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	Re: MED 9.1 basics « Reply #263 on: October 29, 2015, 07:13:30 AM »

You're happy with IRL + IOP? MDZUL?


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Nottingham

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	Re: MED 9.1 basics « Reply #264 on: October 29, 2015, 01:07:58 PM »

I´m about to give up.
Something is limiting rlmax_w to 177.703125% regardless how much higher LDRXN allows.
It could be EGT related as the temperature calculation model is completely fucked up with the changed hardware.


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dream3R

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	Re: MED 9.1 basics « Reply #265 on: October 29, 2015, 01:37:20 PM »

You have to log the ram and back trace unless someone pops up mate.


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ddillenger

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	Re: MED 9.1 basics « Reply #266 on: October 29, 2015, 01:39:54 PM »

Quote from: Nottingham on October 29, 2015, 01:07:58 PM

Have you tried FF'ing LDPBN?

(please, don't ask me why, just try it).


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Nottingham

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	Re: MED 9.1 basics « Reply #267 on: October 29, 2015, 01:43:47 PM »

Quote from: dream3R on October 29, 2015, 01:37:20 PM

You have to log the ram and back trace unless someone pops up mate.

There are 14714 RAM variables. Adding one takes around 5 minutes.
You can log up to 12 simultaneously without special hardware.

I think you got my point already.

Logging is futile unless you know exactly where to look at.


« Last Edit: October 29, 2015, 01:45:39 PM by Nottingham »	Logged

Nottingham

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	Re: MED 9.1 basics « Reply #268 on: October 29, 2015, 01:46:17 PM »

Quote from: ddillenger on October 29, 2015, 01:39:54 PM

Have you tried FF'ing LDPBN?

(please, don't ask me why, just try it).

Makes no difference.
I´ve tried it at stock and set to max.


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dream3R

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	Re: MED 9.1 basics « Reply #269 on: October 29, 2015, 01:48:24 PM »

Quote from: Nottingham on October 29, 2015, 01:43:47 PM

it's not but you need to have an ida project. There's more var's than that too A2L's are sparing some normally

Then there 16 and 8 bit structs..


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