Vehicle & Technical > Range Rover
V8 Downpipe, one or two cats?
Jonny Boaterboy:
Now that's interesting! I have got cats that are rattling and have been wondering what to do. I have been told by the MOT place that if The Range Rover was made after a certain date (1990 I think) it falls into a lower emissions bracket, hence the cats to bring the emissions down to that level. I have been told that you can remove them but still have to be below the emissions level which is only achievable with a good tight engine...... well I'm up to 160,000 miles now and don't think I would get away with it.... that said I don't burn any oil and the engine seems good, and at every MOT test the emissions have been really low.
My other concern is altering the back pressures in the exhaust. I was told that if you want your Land Rover V8 to run smoothly you need to stick with a genuine exhaust. If you fit an oversized stainless steel exhaust minus a silencer to get more BHP you only achieve this if you have the ECU remapped. How true is this? Can you just cut out the cats and still have it running smoothly?
craig_midz:
all i know is i have cut the cats off my exhuast an kept middle box in for back pressure an it does seem to give it a bit more poke an a better exhuast note an mines done 102k an its a 1996 disco an it flys through the emissions but a tip to get ya car through emissons if its just over is turn on ever eletrical item on in your car as it draws power will lower the emissions sounds daft but it works ;)
JIMBOBLY:
definatly 2 cats mate,as i have already cut mine out,if you leave the lamda sensors where they are it will automatically adjust everything,ie the mixture timing etc,thats what the sensors do,i left the cat boxes empty,but i have done some for other people,and they dont like the noise,so you can either cut the whole lot out,or discuise it,by cutting the side of the cat that buts up against the chassis,knock the guts out,weld a pipe in the centre,then weld the bit you cut out back in,that will stop the resinating noise you will get,so if anyone got underneath and had a look,they'd think you still had cats in,and what the other chap said,if everything is in good working order,it will still scrap through the test,mine has twice now,with quite a bit to spare on the emission limit :dance:
Range Rover Blues:
--- Quote from: Jonny Boaterboy on December 07, 2008, 18:02:10 ---Now that's interesting! I have got cats that are rattling and have been wondering what to do. I have been told by the MOT place that if The Range Rover was made after a certain date (1990 I think) it falls into a lower emissions bracket, hence the cats to bring the emissions down to that level. I have been told that you can remove them but still have to be below the emissions level which is only achievable with a good tight engine...... well I'm up to 160,000 miles now and don't think I would get away with it.... that said I don't burn any oil and the engine seems good, and at every MOT test the emissions have been really low.
My other concern is altering the back pressures in the exhaust. I was told that if you want your Land Rover V8 to run smoothly you need to stick with a genuine exhaust. If you fit an oversized stainless steel exhaust minus a silencer to get more BHP you only achieve this if you have the ECU remapped. How true is this? Can you just cut out the cats and still have it running smoothly?
--- End quote ---
Change the oil before the MOT. makes a big difference.
ECU, it can adjust itself to cope with a free flow exhaust and K&N but no more, so bigger engines, naughty cams all need a new ECU but de-catting iot should cope with, after all you can tell the ECU there is no cats with the TSR anyway.
Reggieroo:
Mines on LPG so should go through the MOT anyway. I haven't even got the ECU plugged in as the petrol system doesn't work since I flooded it in a ford :shock: I wonder if the running will be affected without the cats then?
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