DPF removal - ECU remap?

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
I was interested in the whole "poke a pipe through it" bit. I guess a tester wouldn't tell by looking and a diesel isn't tested on emissions. Would it make a noticable improvement?

Nik
 
2.0_hippo said:
Its a bit of a grey area really,

from Vosa's website it certainly seems to only relate to petrol engined vehicles.

I have also have spoke to a couple of MOT testers who have also confirmed the cat test only applies to petrol cars. so there's not an issue with De-catting a diesel with regards to passing the MOT test.
Click to expand...

Yes the cat test only applies to petrol engines. And they MUST have a cat fitted even if presented on gas. But the testers manual clear makes that statement. "If a cat was fitted as standard and is not present". Fail. Maybe needs to be clarified. I would tend to agree that a cat on a diesel is much a waste of time. In the areas you would want is to reduce emissions (around town) it does not get hot enough to do much. DPFs are another problem, EGRs create soot the DPF collects it. But only gets hot enough to burn it off on sustained runs over 40-50 mph. So if you have one fitted and only do short trips around town at lowish speeds it can clog up causing running problems.
 
As a tester myself a cat test is for petrol and a dpf is for newer vehicle ie 2009 ish onwards a p38 has a soot collector not a dpf! Dpf are built into the ecu managment a p38 soot collector isnt.

Dpf are fitted to euro 4/5 diesels to help with the emmisions a p38 is a euro two.

If a car was presented for test and a soot collector or a modified exhaust was fitted and it had two boxes removed how are you meant to know if the original exhaust has 3 silencers or 2 as there isnt no way of find out unless you have the same model next to you that hasnt been touched since it left the factory

the mot test is a bare minimum standards to be deemed roadworthy at time of test.

All tester test slightly different its a known factor and always will be.

Well thats my rant over!!!!!!:D
 
I have heard that a cat fitted to a diesel is for mostly reducing the smell of diesel that is produced from the exhaust

I do know that they can smell a bit once de-catted, so that statement may be true ...
 
2.0_hippo said:
I have heard that a cat fitted to a diesel is for mostly reducing the smell of diesel that is produced from the exhaust

I do know that they can smell a bit once de-catted, so that statement may be true ...
Click to expand...

Yes that maybe the case sounds feasible.
 
matt1987 said:
As a tester myself a cat test is for petrol and a dpf is for newer vehicle ie 2009 ish onwards a p38 has a soot collector not a dpf! Dpf are built into the ecu managment a p38 soot collector isnt.

Dpf are fitted to euro 4/5 diesels to help with the emmisions a p38 is a euro two.

If a car was presented for test and a soot collector or a modified exhaust was fitted and it had two boxes removed how are you meant to know if the original exhaust has 3 silencers or 2 as there isnt no way of find out unless you have the same model next to you that hasnt been touched since it left the factory

the mot test is a bare minimum standards to be deemed roadworthy at time of test.

All tester test slightly different its a known factor and always will be.

Well thats my rant over!!!!!!:D
Click to expand...

Yes i know the P38 does not have a DPF. But on vehicles fitted with them they can get clogged by soot if not heated occasionally to burn it off. The soot and particles are trapped in them then burned off by extended use at higher speeds. That is what they are there for.
 
I am fully aware of the dpf and there reasons for being there wammers. The fact is that some are saying in this thread that a soot collector on a p38 is a cat or dpf ofsorts which is not the case. I have to deal with these dpf units daily due to the fact that people buy these cars with them fitted and not doing the correct driving cycle which these units need. There are designed imo for reps who travel up and down the country for meetings etc not for a oap to go to the local shop and travel nomore than 10 miles a week. I have to deal with the force regeneration when they go wrong. Making sure they have the correct oil in the engine and not being to full making sure the 5th (dpf injector) is working. Checking working pressure etc.


A soot collect lets say p38 will collect approx 50/80% and burn it off when it gets hot enough a dpf will collect between 80/100 % and burn it off if used in the correct manner.
 
You can/could get them with/without them fitted but most have them fitted nowadays the best vehicle ive seen them fitted to is a 12/13 defenders which are primary use for .......... slow offroading and trotting around a farm a dpf unit requires long runs with high exhaust temps seems silly to me dont you think!!!
 
The Mad Hat Man said:
No. it is because, as you said, they need a regular 20 mile run @ 50mph to clean or "regenerate" the DPF. if not, it can screw up the EMS :(.


BBC - Watchdog: Is your diesel filter out of kilter?
Click to expand...

Don't think you followed. They trap soot and particles at low speed around town then get rid of them out of town if you will. Taking them off if you just drive round town fills the townies lungs with soot and particles. That's what i meant.
 
matt1987 said:
As a tester myself a cat test is for petrol and a dpf is for newer vehicle ie 2009 ish onwards a p38 has a soot collector not a dpf! Dpf are built into the ecu managment a p38 soot collector isnt.

Dpf are fitted to euro 4/5 diesels to help with the emmisions a p38 is a euro two.

If a car was presented for test and a soot collector or a modified exhaust was fitted and it had two boxes removed how are you meant to know if the original exhaust has 3 silencers or 2 as there isnt no way of find out unless you have the same model next to you that hasnt been touched since it left the factory

the mot test is a bare minimum standards to be deemed roadworthy at time of test.

All tester test slightly different its a known factor and always will be.

Well thats my rant over!!!!!!:D
Click to expand...

Over here, it's simple, the tester scans the VIN off the log book and the computer screen will tell exactly what was fitted originally.
 
matt1987 said:
You can/could get them with/without them fitted but most have them fitted nowadays the best vehicle ive seen them fitted to is a 12/13 defenders which are primary use for .......... slow offroading and trotting around a farm a dpf unit requires long runs with high exhaust temps seems silly to me dont you think!!!
Click to expand...

Yes i do, that is why i raised the point in the first place. :):)
 
Load of old cods wallop
572B79C1-49B1-45B8-84CA-6292FBC206F6-2735-0000041FEF7402A3.jpg
 
You must log in or register to reply here.

Similar threads

JT_spark
Another P38 2.5DSE 4th injector Question
2
Replies
28
Views
4K
JT_spark
JT_spark
F
Range rover nightmare.
2 3 4
Replies
70
Views
8K
f40cab
F
Almonds
Help Request: 300TDI Overheating Mystery / Poss Bleed Hose?
Replies
2
Views
427
D1Nut
D1Nut
C
Freelander 2 (LR2) Engine Removal Sequence
Replies
4
Views
3K
pwood999
pwood999
Montyjohn
P38A Head Gasket Probably Blown - Advice
2
Replies
21
Views
4K
Mark Piercy
Mark Piercy
Back
Top