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Turbocharger: Low Power Despite 1.9 Bar Boost

 
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MillenChi



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Post13-06-2011, 22:00    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

Hello everyone,
After reading quite a bit here over the past few weeks, I had a crafting day today.

First of all.
The brakes are okay.
The VTG is easy to operate.
There is no axial turbowave interference.
Radial wave interference is low.

AGR is leaking a bit, but it seems to be working (according to the logs).
LMM provides values that are plausible (at least for me).

Error:
It seems to me that lately my car has been taking longer and longer to get up the hill (leading to/from my house).
Now, when I'm pushing it to the limit, I'm about 20 km/h slower at the top end. Instead of reaching 110 km/h, I can only manage 90 km/h.
Therefore, there is a lack of performance.

To me, all the log data seems plausible.
Therefore, I am asking for your help with interpreting this.

Here are the logs:
Ich kann den Inhalt dieser URL nicht abrufen und übersetzen. Bitte gib mir den Text, den du übersetzt haben möchtest.

After a brief warm-up period,
"Warm 1" logged. It's a somewhat longer round, with a lot of back and forth.
After that, we found a clear road and...
"4. "Full load" or "maximum capacity".
Then we hiked up the "local mountain" and afterwards logged it from a stationary position.

Depending on the log file data, boost pressures of up to 1.9 bar can be achieved during transient conditions.

And to top it all off, there's a strange noise coming from the turbo area at 2000 RPM, which is within the range where I experience the highest pressures.

Do you have any more ideas?

Greetings!
David.
Ein Klangfuzzi auf Abwegen


Translated on 01-08-2026, 16:40.
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mullemaus
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Post14-06-2011, 21:45    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

Is there also a 3/8/11 log? icon_confused.gif

And then do it PROPERLY? Shift into 4th or 5th gear from a low RPM by accelerating!


Translated on 01-08-2026, 16:43.
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MillenChi



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Post14-06-2011, 23:17    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

3/8/11: I might still be able to do that tomorrow...
But it simply won't go any slower than that.
"1500 to 4200 should be enough."

Sure, here's the translation:

"Thank you in advance."
Ein Klangfuzzi auf Abwegen


Translated on 01-08-2026, 16:44.
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mullemaus
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Post14-06-2011, 23:35    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

I have no idea; what I saw was a short burst of speed, the rest was junk. icon_confused.gif


Translated on 01-08-2026, 16:44.
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MillenChi



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Post15-06-2011, 17:45    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

Okay...
Here's the log from August 3rd, 2011.
/download.php?id=5864
Full load, 4th gear. 1512 - 4116 rpm.

Sure, here's the translation:

"Thank you in advance."
Ein Klangfuzzi auf Abwegen


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dieselschrauber
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Post21-06-2011, 20:11    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

Hello,

The log doesn't look too bad. The overshoot is within a non-critical speed range, and the mass airflow sensor seems to be okay.

Due to the unusual "rpm" during the overrun: is the catalytic converter okay and not damaged?

Regarding lack of power: Does it produce excessive exhaust fumes when running at full throttle, or not? Theoretically, the values shouldn't indicate that, but it's possible that two errors are occurring simultaneously.

Best regards, Rainer.


Translated on 01-08-2026, 16:46.
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MillenChi



Joined: 06/11/2011
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Location: Nähe München

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Post21-06-2011, 21:05    Subject: Turbocharger: Low Power Despite 1.9 Bar Boost Quote

Hi, thanks for the help. I'll take a look at the catalytic converter soon and see what's going on. The noise has to be coming from somewhere.
Ein Klangfuzzi auf Abwegen


Translated on 01-08-2026, 16:47.
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