Modified cars and the MOT
Discussion
Funny you should mention V6's in Mr2's 
If the car is any age but the engine you transplant in, is pre-1995 then you get a non-cat test.
If the car is pre 1995 but has a newer engine then it still gets a non-cat test.
It simply goes on whatever is the older of the 2.
If the car is standard engined and is post aug 92 then it'll get a cat test.
3VZ's and 1MZ's in an Mr2 (mk1 and Mk2 at least) normally come out with a lower reading than they did as standard. The wonders of economical FE engines.
If the car is any age but the engine you transplant in, is pre-1995 then you get a non-cat test.
If the car is pre 1995 but has a newer engine then it still gets a non-cat test.
It simply goes on whatever is the older of the 2.
If the car is standard engined and is post aug 92 then it'll get a cat test.
3VZ's and 1MZ's in an Mr2 (mk1 and Mk2 at least) normally come out with a lower reading than they did as standard. The wonders of economical FE engines.
FreeLitres said:
So what about a highly modified Evo running anti-lag? Wouldn't this be throwing more hydrocarbons out of the exhaust pipe than a standard Evo?
Point to note, the more sane turbonutters tend to switch off anything that produces 3 foot long flames from the exhaust for any 'official' test or evaluation.How does this work regarding classic cars?
I have always assumed that as long as the car is not visibly smoking out the test station - anything goes.
My 500 has a much larger than standard carb fitted, along with a bigger exhaust and sportier cam profile - the emissions are now greater than original spec, but I don't think they are tested.
I have always assumed that as long as the car is not visibly smoking out the test station - anything goes.
My 500 has a much larger than standard carb fitted, along with a bigger exhaust and sportier cam profile - the emissions are now greater than original spec, but I don't think they are tested.
sniff diesel said:
OlberJ said:
If the car is any age but the engine you transplant in, is pre-1995 then you get a non-cat test.
If the car is pre 1995 but has a newer engine then it still gets a non-cat test.
Pre August 1st 1992 for a non-cat test I thought?If the car is pre 1995 but has a newer engine then it still gets a non-cat test.
cheesesliceking said:
correct.
Or if you have an import and there is no equivalent UK car on the MOT system, cat test only applys to cars post August 1995.Also worth noting that a the cat test is purely about emissions, if you dont have a cat its not an issue so long as you can meet the emissions standards laid out in the "cat" test.
Sorry for necroposting on a nearly 8-year-old thread, but I was just reading on the subject of engine mods. I have a real hankering after a W211 E63 AMG estate, but the stock 507bhp engine leaves much undeveloped potential, particularly in the cam department. The standard cam lobes are tiny - really short duration. Longer-duration higher-overlap camshafts are available from various tuning companies... as are ported heads, and upgraded intakes and headers. There are, allegedly, some of these engines making as much as 700bhp naturally-aspirated - and that's on the standard 11.3:1 compression, nobody makes higher-compression pistons for the M156 as far as I've been able to find out. Assuming one went for a relatively sensible tune to around the 600bhp mark, would this be likely to affect the car's ability to pass an MoT emissions test?
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