Vehicle & Technical > Discovery
Cat free exhaust parts???
barny:
--- Quote from: "DiscoJim" ---
--- Quote from: "barny" ---Does anyone know when diesel cat law came in ? Mines had a new un fitted recently, but in the interest of squeezing more power from the 300tdi engine i'll quite happily swap it for something more willing ! 8)
--- End quote ---
I am not sure that CATs are required on any diesels, if they are it will be fairly recent maybe 1998-2000 something like that.
--- End quote ---
Marvelous, that can be binned then ! Theres a stainless steel exhaust maker near here, i'll have a wander over some time and get some prices 8)
Jake:
I'll be doing the same with my exhaust soon.
The flexy section is shot and the partical converter is killing my power and i want a side exit pipe too.
I had some flexy pipe on my V8 and it ran out the side (which was much neater and never got smashed)
8)
Porny:
You do not need a CAT on any diesel, regardless of age...
A Catalytic Converter test only applies to Spark Ignition Engines (i.e. Petrol's) not Compression Ignition (i.e. Diesel).
The catalyst test is part of the MOT test for most class IV spark ignition petrol engined passenger cars with four or more wheels first used on and after 1 August 1992.
A Diesel Engine only undergoes a smoke test… which a CAT will not effect anyway. A CAT does not stop Diesel smoke.
Vehicles first used before after 1 August 1979 – only have to undergo a visual smoke test
Vehicles first used on or after 1 August 1979 – are tested with a probe.
But either way a CAT is not tested regardless of whether it is fitted or not.
And a 300Tdi is not a proper CAT anyway, only a particulate filter.
The reason a CAT and EGR where fitted when new was to ensure that Land Rover met EU emission regulations for that model year. This is needed to gain type approval for that vehicle.
However, what the owner does to the vehicle once they have bought it is up to them…. The only test it will undo again is an MOT. It never needs to meet the EU legislation. So as long as it passes an MOT then an owner can do what they like.
Hence why people remove CATS and EGR without a problem.
Neither my 90, my parents Disco or my brothers Disco (all 300Tdi) have CATs or EGR fitted, and have never once had a problem. (and my 90 exhaust is far from standard!!!)
When the TD5 was launched it didn't need a CAT either, but one was fitted latter in it's life to meet EU4 legislation. (but again an owner can remove it!!)
--- Quote ---Do you notice much difference without the cat
--- End quote ---
A minor difference, less back pressure means the turbo will spin up slightly quicker... more noticeable mid range.
Removing the large centre silencer box also makes a difference, again you will notice a slight improvement mid range.
As for noise - with just the rear small silencer:
if the system stays a standard length, then it doesn't get too load (the turbo acts as a silencer anyway).
It is louder outside the car (and you will get an exhaust burble at idle) - and a whistle when on boost, but you can't really notice it that much from the drivers seat.
The noise only increase if you shorten the overall exhaust length; like the exhaust on my 90
Ian
barny:
Excellant, you've sorted all my thoughts for me !
Now if you could just find a way for £75k per year ..... :wink:
nishikigoi:
--- Quote from: "barny" ---Excellant, you've sorted all my thoughts for me !
Now if you could just find a way for £75k per year ..... :wink:
--- End quote ---
Rent boy :smack:
:(mad):
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