Soot emission reduction. Will it make a difference?

Hello, fellow diesel enthusiasts.

I'm driving an ALH engine with 0.216 injectors and OBD programming.
Approximately 145 horsepower, 1.25 bar boost pressure, and 300 Nm of torque.

When accelerating hard, around 2800 RPM, it starts to emit a slight gray haze from the exhaust, which is especially noticeable on the highway at high speeds.

Would it actually achieve anything (besides increasing lambda or reducing injection quantities) if one were to proceed as follows:

1. Replace the suction nozzle with one provided by ARL.
2. Optimize the airflow to the intercooler (by cutting a larger hole in the bumper and performing some adhesive bonding).

Regards,

Borys.

Replace the suction nozzle with one provided by ARL.


No, but it reduces the load on the charger.

You mainly see it on the highway when driving at high speed.

Optimize the airflow to the LLK (cut a larger hole in the bumper and perform certain adhesive bonding work).

Yes, things should get better. The second one worked for me. LLK also brought improvement - I had the tuning file from a faulty tuner back then (www.obd2-motor*uning.de - I think I could probably do it just as well now), and on the highway, everyone kept a good distance .





Cut a larger hole in the bumper and perform some adhesive bonding.

Make sure that all the air entering through the hole actually passes through the heat exchanger and doesn't leak through any gaps or cracks beforehand. Furthermore, the air must be able to flow freely out of the low-temperature coolant (LLC) system; therefore, the space behind it should not be obstructed (e.g., by a parking heater, etc.).


ALH with 0.216 nozzles

What size spark plugs are you using? The ones from a T4, or custom-made? It would be great if someone could clarify why some tuners provide a 0.216 spray pattern (explicitly) for four-cylinder engines, while others use the 0.216 from the T4 .

There are some here from the shop.
You'd really have to ask Rainer to find out what the actual spray pattern looks like.

Regards,

Borys.

Hi Borys,

You have PM regarding another possible cause of the error.

My offer still stands.

@Nebelwerfer: Don't worry, the nozzles he has installed will fit.

The car essentially has a problem where the air mass values for the turbocharger boost pressure are relatively low, but the air mass sensor is measuring correctly.

Best regards, Rainer.

The car essentially has the problem that the air mass values for the boost pressure are relatively low, but the air mass sensor is measuring correctly.


This suggests that the measured, full boost pressure is not reaching the cylinders. This could be due to intake channels clogged with deposits from the exhaust gas recirculation (EGR) system, or other restrictions between the boost pressure sensor and the intake valves. The desired pressure is achieved (even more easily), but the amount of air being drawn in is still less than the target value.

Alternatively, exhaust gases might be leaking through a faulty EGR valve (potentially causing a negative scavenging effect in turbocharged engines) and entering the intake air, thereby displacing some of the intake air, which the mass airflow sensor then measures insufficiently.