NikTheGeek
New Member
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
Nik
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!!!!!!
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!!!!!!
Yes that maybe the case sounds feasible.
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!!!!!!
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.
tiz recomended to remove them if the vehicle is only used on short urban runs.
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.
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.
That would sort of defeat the object of fitting them in the first place.
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?
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!!!
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?
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.
Datatek
Well-Known Member
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!!!!!!
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.
Grit Valve
2000 4.6 Vouge
Load of old cods wallop
Grit Valve
2000 4.6 Vouge
What is explain please?
No set noise levels for production cars only bikes and kit cars
Where does it say that?
