Vehicle & Technical > Discovery
exhaust
spy:
I have just put straight through side exit on my 110 (disco 200tdi engine). Speaking to a mate who is an MOT tester its nowhere near as loud as some chav motors. Also he said, there is a max decibel alowed for exhaust but like most places they have no way of measuring decibels. It would have to be painfuly loud before he even considered failing it.
If I ever had one that failed on noise levels I would be asking the test station to prove the level in decibels before I mentioned it to VOSA....
karlo:
It will fail if it's a petrol engine not if its a diesel if you remove the cat.
muddyoffroader:
IT WILL FAIL WITH NO CAT, KARLO IS RIGHT! :clap: YOU COULD PUT AN OLD CAT ON IT WITH ALL THE INSIDES KNOCKED OUT BUT KEEP YOUR GOOD EN FOR THE MOT's. :dance: the reason i say use an old one is if ye ever get tug off the old bill accompanied by vosa when they look for a cat it looks like its still there. ye usually get approx 6 to 15bhp more depending on the engine when the cats removed.
muddymud:
i think im going to go for a straight through and put a poformance backbox on the back to give it abit more beafy sound as the 200tdi sounds alot like a tracter with no exhaust and as im only 17 i like my cars deep and loud :D but will i loose power with just a straight pipe?
Also both my mates who have diesul cars both with a de-cat exhaust pass the MOT every time, it depends on what care and the age i think!
Cheers,
Nick
Porny:
--- Quote from: muddy henry on January 29, 2009, 23:02:36 ---my disco is a 1997 300tdi which has to have a cat on at that year anything b4 1985 dont need a cat even if fitted you can remove them as they dont come into a mot
--- End quote ---
You do not need a CAT on any diesel!!!
The current 2008 MOT system for Diesel (i.e. compression ignition) vehicles only requires an Opacity test, (i.e. smoke) and not an actual emissions test as per petrol (spark ignition engine).
The catalytic converter (and EGR system for that matter) does not actively affect smoke…. This differs from a diesel particulate filter (which is also exempt from testing at the current time). The only requirement is that the max smoke value for a turbo charged diesel is a mean (of the last 3 smoke tests) not exceeding 3.00m-1. For an initial 'fast pass' the smoke value must be below 1.50m-1.
In simple terms.... the only reason a modern diesel have CATs and EGR (along with other things) is to enable a manufacturer to meet the current EU legislation (for example EU4/5), but once a vehicle model has been type approved, and sold to the customer... the customer is technically free to do what they like regarding emissions, as long as they meet the requirements of their country, which in the UK is just the MOT test.
For Petrol/Spark Ignition:
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.
Carbon monoxide (CO), hydrocarbons (HC) and lambda (~) are checked at fast idle speed and carbon monoxide (CO) is checked again at idle speed.
The test should be self explanatory using the automated routine on 1996 specification exhaust gas analysers The following points should be borne in mind.
This can be confirmed by reading the MOT manual - http://www.motuk.co.uk/manual_740.htm and here for petrol (source of above quote) http://www.motuk.co.uk/manual_730.htm
Ian
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