cylaptor

Hi,
I'm faced with the dilemma of whether to delete the Dpf and I don't know if I would also delete the Egr, as I'm of the opinion that the Egr would let it perform its function. The car has driven 205,000 km.
Opinions are welcome

Gazwould

Engines should breathe only cool clean filtered air...

cylaptor

yes but egr is created to lower the temperature in the engines and thus reduce the stress on the materials.
Blocked Egr = too high thermal stress for cylinders

Russell Ormerod

How are you planning to delete DPF?

cylaptor

an muffler containing kat and dpf would empty only the dpf contents. However, I don't know how well the programming can be done to keep the Egr in normal operation.

Gazwould

No stress + if you have a car tuned properly afterwards EGT's are monitored .

I've egr vac lines plugged on a 25 year old petrol turbo , this cured a cruising kangaroo effect .

And an 18 year old turbo diesel on 190K , this gave me more turbo spool as exhaust gasses aren't being diverted + several other benefits .

cylaptor

does the automatic transmission also need a new software adjustment with egr deletion ?

trigital

Most cheap and logical solution is to repair the faults of engine.
DPF clogged is only an effect. The cause is a malfunction on engine.

Even if you delete DPF, EGR, etc the problem will remain as the main cause of malfunction is still there.

And yes, the role of EGR is too much important ...imagine as EGR role is the same but on reverse as turbocharger ( beside the cooling function - as the EGT can't cool...........without EGR help)
Turbocharger fill your combustion chamber with more quantity of Oxygen ( more O2 can handle more fuel, so more power...) and EGR fill your combustion chamber with less O2 ( for the same volume) and less O2 can handle less fuel, less fuel means good consumption, less pollution, smooth driving at low speeds, etc

cylaptor

Personally, it bothers me the most because I noticed in 2 previous vehicles with blocked Egr that the engine also brakes when we take off the gas pedal. I did research on this topic and found that because having more oxygen in the cylinder creates a vacuum against which the cylinders fight with themselves. It is known that if the Egr is in function, the inert gases do not create this vacuum and when we take off the gas pedal, the engine makes a longer distance because the Egr then opens and so we also have a greater range of kilometers traveled.

Russell Ormerod

Dpf can be turned off with scn coding.

Gazwould

I've found the egr delete / off / disable to be worth a few mpg and that's over 4 cars with it done .

The S14 was smoother at low cruising speeds after the vac line disable .

The recirculated hot sooty inert exhaust gasses causes even more soot through more incomplete combustion of fuel molecules , hot egr gasses can even hole plastic / composite inlet manifold , more soot to carbon up VNT turbos , soot to combine with normally occurring crank case oil vapour creating an evil gunk that coats the inlet system causing things to break and less efficientcy .

Soot is abrasive , gets in your oil and causes wear .

If you think an engine should breathe it's own excrement you must be mad . We have an air filter for an engine to breathe cool , clean , filtered air and that is what it should only breathe .

The egr is the devil !

trigital

Not on modern MB, dear Sir!
From long time ago, MB use EGR gas cooler and what is more important is that if your engine runs smooth, the exhaust gas is also clean.

When engine needs power, the EGR is always closed, so...from where abrasive soot?

Also, deleting the EGR is ilegal. Annual or registration tax is based on CO2 emissions, declared with EGR on.

Gazwould

Yes modern MB , despite an egr cooler these hot gasses still can hole a composite inlet manifold .

Diesel compression combustion produces more soot than petrol and the egr causes more soot to be produced .



The only way you will get clean egr gasses are those who have recirculation post dpf !!

Which very few car makes have .

trigital

Yes Sir, MB use 2 EGR as well ( from 2012 in EU ) on smaller models like A, B, CLA, GLA, etc.

For city drive, when Engine did not produce heat or soot, use high pressure EGR with cooling circuit.

This way, the combustion chamber is filled with air with much less oxygen, this permits a less quantity of fuel ( due to stoichiometry) to be used.

Is exact the reverse of turbo, in slow drive it simulated a half a engine ( use a 2L Engine with 1L O2/fuel ratio), so less consumption with low gas temp and of course without NOx.

In partial request, like low speed highway driving, the high pressure EGR is always closed and the second EGR begin to make the air/oxygen ratios convenient.

The second EGR is after the DPF and use clean gases.

And when full potential is needed, all EGR's is closed, this way all exhaust energy can be used by the turbo, that compress more oxygen in the same volume of the combustion chamber...that simulates a double capacity Engine.

Those are not my thoughts... every manufacturers use this simple and effective solution.

Also, forget about soot into intake manifold, on actual models...of course only if you use correct oils, filters and especially the Service Procedures.

Gazwould

This is a C Class W203 thread and neither it or W204 got 2 egr's .

cylaptor

my vehicle is thus written in the vehicle equipment codes: 926...Exhaust gas cleaning with Euro 4 Technology.
Apparently, the vehicle has Dpf installed. What is the actual difference between Dpf Euro 4 and Euro 6 for example?

trigital

Is it not noticeable differences between the DPF's, Euro4-Euro6.

But there is huge differences between the engines and management strategies.

Newer generation, besides better power and smoothness, consumption or longer service intervals, produce a far less smoke or dirt.

Of course, the NOx part is that where worries is focused now, but again on MB, this is different than rest of the brand's.

Don't forget, there is only 2 types of cars in this world... Mercedes and the rest!

cylaptor

my wish is to remove the Dpf from the exhaust pot and leave only the catalyst inside, for better airflow. In our country, the catalyst is enough. I will also have to reprogram the car in the computer and leave the Egr inside as active as before. Is it hard to do programmatically ?

trigital

Sometimes, is not about the country or climate. Is about the lungs, especially about the kids lungs, as maybe you can imagine as kids breath even when they sleep with open window...

Gazwould

Yet who gets exposed to the most pollution in a city , a bus driver , cyclist , pedestrian , or car driver ?

trigital

Maybe all, but the cyclists has always the lungs in "Turbo mode" and can absorb the most of the particles...yeah crazy world... when thinking that trees need CO2 for growing and producing O2... increíble!

Gazwould

This is it and why I know it's all about money not health .

It's the car driver and passengers that get the most pollution !

cylaptor

well today we took off the air filter housing and thermal protection of the catalyst, and found that there is no Dpf pipes at all and I don't have Dpf. At the top of the catalyst is only the lambda connection. Could a man be happier.