Remove soot with cold air?!

Hello engine experts and physicists!

Since it has gotten colder, I haven't observed any more black smoke coming from my tuned T4, 2.5 TDI ACV, with approximately 140 horsepower. Could it be that a 10° difference in air temperature increases the air density to such an extent that there is enough oxygen to completely compensate for the black smoke? If the difference were that minimal, a correction of the fuel injection amount, even in the summer, might achieve the desired result! Are there any experiences with this?

Best regards, Peter.

Hello,

Quote:

Is it possible that a difference of 10° air temperature can increase the air density to such an extent that there is enough oxygen to completely compensate for soot formation?

Yes, that's possible. If it barely makes it through the winter, there might be a small amount of fuel left over in the summer that doesn't have enough oxygen for combustion.
It could also be due to the fuel. Winter diesel often has a slightly higher fuel consumption, which means it contains a bit less energy (and oxidizing agents) per unit volume. This is also related to the topic of the MFA fuel consumption display.

Best regards, Rainer.

Hi,

It somehow reminds me of an LLK journal article...

Greetings.
Thomas.

[Translating...]

Hallo,

ich gehe jetzt davon aus, dass der Wagen - da neueren Datums - einen Luftmassenmesser hat. Wenn ich richtig informiert bin, ist doch der Vorteil des Luftmassen- gegenüber dem Luftmengenmesser, dass dieser auch die Temperatur mit berücksichtigt. Unterschiedliche Lufttemperatur müsste also durch das STG dann entsprechend berücksichtigt werden.

Gruß
Thomas

PS: Korrigiert mich bitte, wenn ich falsch liegen sollte. So viel Ahnung habe ich nämlich auch nicht.....

[Translating...]

Er hat sein Auto aber getunt...