"AGR for Dummies": An attempt at a summary

Sure, here's the translation:

'First of all:'
Yes, I am familiar with the search function on this forum.
I think I've read everything.
also the knowledge base and Marco's comments about his AKN (presumably a specific project or initiative).
but I need confirmation again that what I...
it all makes sense, and it's correct (and doesn't harm my AKN!!!).

Okay.
1. AGR serves to ensure compliance with specific emission values, although...
2. other exhaust emissions may be worsened (e.g., soot), but...
3. Only under partial load conditions, because at full load, the AGR (Abgasrückführung - exhaust gas recirculation) is too high.
4. If the EGR valve is always closed, the intake area of the engine does not become overly rich, but...
5. So, am I actually going to drive without an ABE (General Operating Permit)?

Can we generalize and say...?
6. I'm doing something good for my engine (extending its lifespan and eliminating potential sources of problems).
7. Elevated combustion temperatures during partial load operation are not critical (charger?).
8. Should everyone really get a TDI because they also offer better performance, especially at lower RPMs?

Okay, and now, feel free to criticize my layman's description of something that's been discussed many times before.
We were discussing a topic, but after a little encouragement, I stopped.

Best regards, Thomas.

Okay, I understand. Please provide the German text you would like me to translate into English.

Hello,

Regarding point 7: That's correct, they are not critical.
because the combustion temperature is not the same as the exhaust temperature (thankfully), and in diesel engines, even without exhaust gas recirculation (EGR), the exhaust temperature in partial load conditions typically ranges between 250°C and 450°C.
Absolutely no problem. Full load operation puts the turbo under the most extreme thermal stress, with exhaust temperatures reaching up to 820°C, depending on the application and tuning.

Regards,

Sepp.

@durnesss

Okay, here's the translation:

'Brief, clear, and includes everything.'

Hi Durnesss,

If performed correctly, no problems are expected, at least my AKN is still in excellent condition. However, of course, no one can guarantee that your engine won't suffer any damage while you're working on it, especially if you choose the 'sheet metal' method. And for some reason, when working on the engine, foreign objects can sometimes get into the intake manifold and are then ground up by the motor.

Hi,
7. Like Sepp.
5. In principle, this also constitutes tax evasion because the favorable Euro 2, 3, or 4 emission standards will no longer be met. But, where there's no plaintiff, there's no judge.
8. There's no difference in torque, but the delay when pressing the accelerator should be reduced. Whether you'll notice it is debatable; in my case, there's not much happening in the lower RPM range anyway. With VTG loaders, things should be different.
6. Otherwise, dirt can be seen as a trade-off for faster warm-up times.
What remains is the susceptibility to malfunctions, because there is no direct error message when the EGR valve jams.

@marco
The sheet metal method seems too complicated for me, and unfortunately, the hose detached from the can.
and I can't seem to remember how to do it anymore. As a temporary fix, I screwed a screw into the hose to avoid disrupting the entire vacuum system.

@christians
Okay, that's what I meant by 'better performance' – not more power, but faster response.

The undisputed slower warm-up time is partially offset by the higher combustion temperatures, or is it???

'First, thank you, I'm relieved. I'll postpone the AGR repair.'
Best regards, Thomas.

durnesss wrote:

The undisputed slower warm-up is partially offset by the higher

.
The temperatures without EGR are only locally higher, i.e., in the immediate vicinity of the tiny diesel droplets, because they burn faster in fresh air than in the exhaust-air mixture. Due to the excess availability of oxygen, nitrogen oxides are produced, which are intended to reduce the amount of harmful emissions.
The average temperatures in the combustion chamber and exhaust are lower! So that heat can also be transferred to the engine.