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Author Topic: Trouble tuning 2.0 TSI on E85 fuel  (Read 29404 times)
dream3R
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« Reply #15 on: January 02, 2016, 06:11:01 PM »

It appears I celebrated prematurely.
Apparently rail pressure request or some kind of limiter is gear dependent or something like that, because in 4th, 5th and 6th gear everything is fine, but in 1st, 2nd and 3rd gear rail pressure request stays at 150 Bar up to 5000 rpm and only after that rises to the 170, although map requests 170 Bar from 4000 rpm.
Has anyone experienced this?
I looked through the file for some kind selector but didn't find anything, although I dont' know if I can trust my definition file after that mistake with rail pressure limiter.


.
In decos it runs of RL not sure on this
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How to work out values from an A2L Smiley

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


Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

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


ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID
S2evo1
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« Reply #16 on: January 03, 2016, 03:34:03 AM »

It appears I celebrated prematurely.
Apparently rail pressure request or some kind of limiter is gear dependent or something like that, because in 4th, 5th and 6th gear everything is fine, but in 1st, 2nd and 3rd gear rail pressure request stays at 150 Bar up to 5000 rpm and only after that rises to the 170, although map requests 170 Bar from 4000 rpm.
Has anyone experienced this?
I looked through the file for some kind selector but didn't find anything, although I dont' know if I can trust my definition file after that mistake with rail pressure limiter.




I will take a look on you're file tomorrow.
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bitmap
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« Reply #17 on: January 03, 2016, 09:33:09 AM »

Thank you very much I really have no idea what is going on because rail pressure request seems to be totally random.
Sometimes it is 170 sometimes 153, sometimes 141 and there doesn't seem to be any method to this madness.

I'll upload the latest bin that I'm running in the car at the moment.

Oh, and I managed to put my car on the dyno today and when everything (semi)worked  it put down 284 hp and 492 Nm of torque.
Torque is really nice and I think if fuelling gets sorted in the upper RPM range there is a real possibility for 290+ hp on stock HW Smiley
I'll post dyno plot later when I get home.
« Last Edit: January 03, 2016, 09:37:30 AM by bitmap » Logged
bitmap
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« Reply #18 on: January 03, 2016, 01:07:03 PM »

So, here's the dyno chart comparison of stock and E85 tune. It picked up 64 hp and 192 Nm over stock Smiley
If fuel delivery issues can be solved, I'm hoping to fix the power dip over 5000 rpm with new exhaust and some fine tuning because on E85 stock exhaust gets very restrictive very quickly.
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dream3R
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« Reply #19 on: January 03, 2016, 01:38:59 PM »

Is there not a rail pressure map? / RL?

Is this MED17?
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How to work out values from an A2L Smiley

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


Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

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


ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID
bitmap
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« Reply #20 on: January 03, 2016, 01:48:32 PM »

It is MED17.5.2
There are five rail pressure maps which I all modified together with corresponding limiters but at full throttle ECU seems to pick spec rail pressure at random completely ignoring values specified in the maps.
In part load everything works as it should but as soon as I floor it in first three gears it is 50/50 chance I won't get the proper spec rail pressure but some random lower value instead.
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dream3R
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« Reply #21 on: January 03, 2016, 02:05:48 PM »

It is MED17.5.2
There are five rail pressure maps which I all modified together with corresponding limiters but at full throttle ECU seems to pick spec rail pressure at random completely ignoring values specified in the maps.
In part load everything works as it should but as soon as I floor it in first three gears it is 50/50 chance I won't get the proper spec rail pressure but some random lower value instead.

Which maps did you change looking at the FR prist_w is the var
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How to work out values from an A2L Smiley

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


Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

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


ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID
bitmap
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« Reply #22 on: January 03, 2016, 02:12:39 PM »

I changed:

KFPRSOLHKS
KFPRSOLHMM
KFPRSOLHOM
KFPRSOLKH
KFPRSOLSCH

and

PRMAX
KLPRMAX
KLPRMAXTF

I even tried to alter % axis in KFPRSOL maps but that didn't change anything.
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dream3R
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« Reply #23 on: January 03, 2016, 02:32:52 PM »

There's at least 4 functions on the go there, I can't read German well enough to help as I haven't studied it sorry but that var comes later on by the looks and goes though filtering etc.   
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How to work out values from an A2L Smiley

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


Starting Rev's http://nefariousmotorsports.com/forum/index.php?topic=5397.msg51169#msg51169

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


ORGORIGINAL 05 5120 creator for Volvo
ORIGINAL Datalogger (Freeware) Author
ORGINAL finder of the 'extra' torque' limits
I don't have ME7.01 A2L I just use ID
S2evo1
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« Reply #24 on: January 04, 2016, 04:43:07 AM »

Thank you very much I really have no idea what is going on because rail pressure request seems to be totally random.
Sometimes it is 170 sometimes 153, sometimes 141 and there doesn't seem to be any method to this madness.

I'll upload the latest bin that I'm running in the car at the moment.

Oh, and I managed to put my car on the dyno today and when everything (semi)worked  it put down 284 hp and 492 Nm of torque.
Torque is really nice and I think if fuelling gets sorted in the upper RPM range there is a real possibility for 290+ hp on stock HW Smiley
I'll post dyno plot later when I get home.


You need to look at 58406 (KLLFPRSG) and change the axis, also I would not run LPFP att 100% (ore 92% as limiter is still stock) as this will overheat the controller.
 Also look at 580C2 (FNGPRS) I have some more stuff but try this first.
A good thing is to messure the low fuelpressure with a gauge.
When you are running so high timing you need to extend the knock meassurement windows and also look at optimal timing.
Have you loged your timing? does it follow your maps? as you have same timing in regular as in optimal.




What is the Changes at 254B0 for?

Let me know how it goes.


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prj
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« Reply #25 on: January 04, 2016, 04:46:43 AM »

Take a look at gradient limitation for requested rail pressure.
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bitmap
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« Reply #26 on: January 04, 2016, 09:29:40 AM »

dream3R: where can one get hold of a MED17 FR? I only have some short crappy version for MED9 and some maps are different in MED17.

S2evo1: I looked at KLLFPRSG several times but decided not to change the axis because all map values are the same.
I'll rescale it to 17 Mpa and see what it does.
Regarding LPFP duty cycle is it not advisable to run it close to 100% at all, or just not all the time as I do at the moment?
FNGPRS looks interesting. Stock value is 1500 rpm ... if I understand its function correctly, should I try to change it to say 500 rpm and see what  effect it has on rail pressure request?

For timing maps I just dumped KFZWOP values into regular KFZW maps until I'm able to tune them properly at the dyno. Actual timing follows requested prefectly and I get no intervention or CFs.

As for changes at 254B0 I have no idea what it is.
I didn't do that but it may have something to do with the fact that my car has an engine swap. It came with 1.8 TSI CDAA which was later swapped for 2.0 TSI CCZA but ECU stayed original, so mabye that's the reason for those changes.

prj: gradient limitation for rail pressure you mean FNGPRS map or are there some other maps that have something to do with this ?
« Last Edit: January 04, 2016, 09:31:20 AM by bitmap » Logged
99pwr
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« Reply #27 on: January 04, 2016, 10:56:48 AM »

As for changes at 254B0 I have no idea what it is.

It is "Security Access Label"
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IamwhoIam
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« Reply #28 on: January 04, 2016, 11:02:33 AM »

Funny how you make changes in a file but you have no idea what some of them are Cheesy
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I have no logs because I have a boost gauge (makes things easier)
bitmap
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« Reply #29 on: January 04, 2016, 11:21:58 AM »

Asi I said at the beginning of this thread I'm new to MED ECUs.
I know how to tune an engine in general but I don't know much about this particular control system and since there is very little info out there about MED9 and exactly nothing about MED17 I'm amazed I even got this far without any major screw up Cheesy

Trial and error is my only option at the moment since I don't know anyone that could help me with this so I really appreciate all the help and guidance members of this forum are giving me Smiley
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