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Author Topic: K04-001 hybrid, high flow ex manifold overboosting like hell (1.8T)  (Read 1710 times)
DwDckQo
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Hello guys, i have new k04-001 hybrid (compressor 42/54mm, turbine 42/50mm) with high flow exhaust manifold, walbro 255, 380cc injectors, fmic, cat/smoke/sec o2 off.

Im struggling with high overboost at WOT. I cant even log it because my DV cant hold boost and at 1.5-1.6 bar start fluttering, sometimes it overboost to 1.8-1.9 bar and Im afraid something won't last and fly off the engine... I have new OEM N75 "E" (I tried disconnect N75 wire and car running at WG spring with 0.6 bar boost stable). Wondering how I know how much turbo boosting? I have a turbo pressure gauge mounted just behind the turbo (not in parallel with the fuel pressure regulator).

I tried log one run (5 gear WOT) and something strange happened, the first time it happened to me that the pressure held up beautifully at 1.1 bar (overboost only 1.3 bar), I also have a photo of the log from it,but when you look at N75 DC it is terribly strange (look at screenshot). After that, i tried 3 gear, 4 gear and car overboosting like hell again. Example: I requested 1900 mbar and actual boost is there about 2300 mbar, I requested 2100mbar, actual boost is 2500 mbar.

If you see screenshot of log where is N75 at 0% @ 2060mbar It can't be because I only have a KFLDIMX axis up to 1000 so KFLDRL is only about 1990mbar?

Im using KFLDIMX and KFLDRL from RS4, because it is more intuitive and easier, but where do I start? Should i change KFLDRL to 95 everywhere and slowly decrease the number? I do not wanna log it in this state...

I also attach my current ecu setup. I don't have well calibrated injections yet (LTFT about -10%, STFT about max. -15%) and my exhaust tailpipe is black, I hope it has nothing to do with overboost problem.

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totti
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« Reply #1 on: September 15, 2021, 07:36:58 AM »

Hello guys, i have new k04-001 hybrid (compressor 42/54mm, turbine 42/50mm) with high flow exhaust manifold, walbro 255, 380cc injectors, fmic, cat/smoke/sec o2 off.

Im struggling with high overboost at WOT. I cant even log it because my DV cant hold boost and at 1.5-1.6 bar start fluttering, sometimes it overboost to 1.8-1.9 bar and Im afraid something won't last and fly off the engine... I have new OEM N75 "E" (I tried disconnect N75 wire and car running at WG spring with 0.6 bar boost stable). Wondering how I know how much turbo boosting? I have a turbo pressure gauge mounted just behind the turbo (not in parallel with the fuel pressure regulator).

I tried log one run (5 gear WOT) and something strange happened, the first time it happened to me that the pressure held up beautifully at 1.1 bar (overboost only 1.3 bar), I also have a photo of the log from it,but when you look at N75 DC it is terribly strange (look at screenshot). After that, i tried 3 gear, 4 gear and car overboosting like hell again. Example: I requested 1900 mbar and actual boost is there about 2300 mbar, I requested 2100mbar, actual boost is 2500 mbar.

If you see screenshot of log where is N75 at 0% @ 2060mbar It can't be because I only have a KFLDIMX axis up to 1000 so KFLDRL is only about 1990mbar?

Im using KFLDIMX and KFLDRL from RS4, because it is more intuitive and easier, but where do I start? Should i change KFLDRL to 95 everywhere and slowly decrease the number? I do not wanna log it in this state...

I also attach my current ecu setup. I don't have well calibrated injections yet (LTFT about -10%, STFT about max. -15%) and my exhaust tailpipe is black, I hope it has nothing to do with overboost problem.



Use other logger(me7log) to log more values. You have to check what is happening with your Boost PID variables.
I would run measurement with fixed WG dc values(0,10,20,30,40,50,60,70,80,95) and see what is the characteristic of your new turbo. After these measurements you can adapt KFLDIMX and KFLDRL.
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nyet
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« Reply #2 on: September 15, 2021, 09:15:30 AM »

Please read the stickies
http://nefariousmotorsports.com/forum/index.php?topic=17551.0title=
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DwDckQo
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« Reply #3 on: September 15, 2021, 09:41:05 AM »

Thanks, i tried run with Me7Logger but it doesn't work for me yet... So, i can try log it with me7logger tomorrow with fixed WG DC (whole KFLDRL at 90 for start point). For now I changed IMX axis to 0, 250, 400, 600, 800, 1000, 1200, 1400 and DRL to 90
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DwDckQo
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« Reply #4 on: September 15, 2021, 10:34:44 AM »

After 3-4 sec of logging with me7logger a got:

....Got error -8
18:53:03.025-614,4 os_sendbuf(len=3, data= 01 B7 B8)
18:53:03.029-603,9 os_rcvbyte(timeout=100) -> 01
18:53:03.030-095,2 os_rcvbyte(timeout=100) -> B7
18:53:03.031-477,9 os_rcvbyte(timeout=100) -> B8
18:53:03.187-642,8 os_rcvbyte(timeout=150) -> TIMEOUT ... multiple times

COM1, 9600 baud, but i cannot change baud in device manager so this could be issue...

EDIT: I updated FTDI driver, now i can change baud rate but same error.. This is some no-name chinese cable i can try buy KKL 409.1
« Last Edit: September 15, 2021, 11:21:21 AM by DwDckQo » Logged
DwDckQo
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« Reply #5 on: September 17, 2021, 11:56:03 AM »

Okay, i make one log im watching it in MegaLogViewer.

Notice, i have P (LDRQ0) from RS4 (whole map is basically lowered to delta 60%), KFLDRL 0 axis at 0.0 and 10, 20, 30, 40, 50, 60, 70, 80, 95 at value 20.0 whole map.

In this log i try only one pull (only at 50% throttle... I really didn't want to try WOT) my gauge show boost 1.5-1.6 bar before MAP sensor.

If you check my log (picture or csv) you see im requesting about 1400mbar and boost start to grow (about 2100mbar). P decreased to -14 and I is at the 0.0

What should I try next?
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nyet
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« Reply #6 on: September 17, 2021, 12:07:21 PM »

Please take a log suitable for the ECUxPlot filter, which requires a wot run in a single gear (perferably 3rd) from 2-3k rpm to redline
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ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
fukenbroken
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« Reply #7 on: September 17, 2021, 12:07:58 PM »

Pressure check wg line
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nyet
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« Reply #8 on: September 17, 2021, 12:08:59 PM »

You are at 20% WGDC and overboosting

stay away from redline Smiley
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
DwDckQo
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« Reply #9 on: September 17, 2021, 12:33:20 PM »

Ye, I stay away from WOT for now, if u see later i get 2500mbar at MAP sensor (my boost gauge overspin lol Cheesy) with 20% WGDC... Good point for line check, actually i have broken one side of pipe going to N75 2 weeks ago... For safe i disconnect N75 wire and run at 0% WGDC, I'll look for leaks first.
« Last Edit: September 17, 2021, 01:09:04 PM by DwDckQo » Logged
DwDckQo
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« Reply #10 on: September 18, 2021, 10:11:55 AM »

Hello guys again, so my WG clamp not holding good, i try pressure test and at 1.5 bar pipe start leaking  Undecided. After really quick fix, I try log it at 2 and 3 gear (check logs) so at fixed WGDC 20%, turbo boost about 0.6-0.7 bar. I have boost spikes right after WOT which I think are caused by removing N249, N112 etc. So I have DV control connected to intake manifold. Is it possible to smooth out these peaks a bit?

Tomorrow I try increase KFLDRL, I'll leave P (LDRQ0) from RS4 for now, same for IMX. What do you think about it ?
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nyet
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« Reply #11 on: September 18, 2021, 11:38:43 PM »

What problem were you trying to solve by removing the n249
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
DwDckQo
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« Reply #12 on: September 25, 2021, 08:57:20 AM »

I have leaks and ecu always go to limp mode, so i delete it (just for clean engine bay).

So now Im boosting about 1 - 1.1 bar. Sometimes when Im going from part to WOT my turbo overboost to 1.5 bar, but after while it is regulated to 1 bar. I need to lower P (LDRQ0) ? Currently i have P from RS4 (look picture).. Also, I uploaded logs, after start is WOT 2, 3, 4 gear (at 4 gear I have -3 ignition pulls, I can reduce KFZW) if you see something wrong please note me Smiley I have static WG DC for high loads about 45-50 DC in map, i need to slightly add at high rpms...

... but Guys, I have really bad cold starts, sometimes my car wont start at first try and my rpms fluctuate while warming up. Any idea what I might look at ? KFFWL or... ? When engine is fully warmed my rpms are really nice and stable (STFT max. -8%) but STFT at cold start is somewhere -20%... I have LTFT at -2.4 %

I thought to use FKKVS fixer, but which logs are best ? Idle or WOT pulls ?

Thanks.

 
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DwDckQo
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« Reply #13 on: September 26, 2021, 07:36:01 AM »

i forgot, i have 0 280 155 868 injectors. TVUB: 1.7416   1.1415   0.9948   0.7814   0.5334 .. TEMIN stock, LTFT now at -1.3%. I increased KFFWL maps about +10% but this is maybe even worse. On idle, my fuel consumption is 1.1l/h with lumpy idle, if i press throttle pedal and i raise rpms to 1100 fuel is about 0.7 l/h so i suppose im very rich at idle.
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fukenbroken
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« Reply #14 on: September 26, 2021, 08:24:42 AM »

And whats the question?
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