TVR MOT Oddities
Discussion
Hi chaps,
Got both the TVR's booked in at a friends garage for MOT's next weekend. I'm entirely confident they will do a great job as they have been around performance cars a long long time (I used to mechanic for him when we were racing).
I know my way round the cars and know what's expected of an MOT as I was involved many years ago, but I'm just on the look out for any gotcha's that might rear their head.
So far I'm thinking:
Back lit number plates
Proper pull on the handbrake
Getting nice and very warm for emissions test
Anything else I need to 'guide' him on?
Got both the TVR's booked in at a friends garage for MOT's next weekend. I'm entirely confident they will do a great job as they have been around performance cars a long long time (I used to mechanic for him when we were racing).
I know my way round the cars and know what's expected of an MOT as I was involved many years ago, but I'm just on the look out for any gotcha's that might rear their head.
So far I'm thinking:
Back lit number plates
Proper pull on the handbrake
Getting nice and very warm for emissions test
Anything else I need to 'guide' him on?
dnb said:
There is an emissions exemption for both the Griffith 500 and AJP Cerbera. The emissions test computer should be aware of these and apply them if necessary. I have used both sucessfully in the past.
What excemption for the Griff is that ? mine passes every year ok,but interesting to know.itiejim said:
dnb said:
There is an emissions exemption for both the Griffith 500 and AJP Cerbera. The emissions test computer should be aware of these and apply them if necessary. I have used both sucessfully in the past.
Oh do tell 
The emissions concession is only really useful if you have an aftermarket ECU and wideband lambda sensor.
It allows you to make the car run lean during the emissions test - lambda=1.03 is the usual lean limit, but this is modified to something like 1.1 for the Griff and 1.3 for the Cerbera. Essentially, it means you can run the car as lean as you like in order to reduce the CO content (at the expense of NOx emissions, but they aren't measured) to just below the limit.
A well tuned engine without cats can just about pass the fast idle test using this trick. Lambda isn't measured for natural idle, so the same trick can be employed, assuming the car will actually run.
It allows you to make the car run lean during the emissions test - lambda=1.03 is the usual lean limit, but this is modified to something like 1.1 for the Griff and 1.3 for the Cerbera. Essentially, it means you can run the car as lean as you like in order to reduce the CO content (at the expense of NOx emissions, but they aren't measured) to just below the limit.
A well tuned engine without cats can just about pass the fast idle test using this trick. Lambda isn't measured for natural idle, so the same trick can be employed, assuming the car will actually run.
dnb said:
The emissions concession is only really useful if you have an aftermarket ECU and wideband lambda sensor.
It allows you to make the car run lean during the emissions test - lambda=1.03 is the usual lean limit, but this is modified to something like 1.1 for the Griff and 1.3 for the Cerbera. Essentially, it means you can run the car as lean as you like in order to reduce the CO content (at the expense of NOx emissions, but they aren't measured) to just below the limit.
A well tuned engine without cats can just about pass the fast idle test using this trick. Lambda isn't measured for natural idle, so the same trick can be employed, assuming the car will actually run.
Doesn't sound like an exemption at all. More like a trick in fact?It allows you to make the car run lean during the emissions test - lambda=1.03 is the usual lean limit, but this is modified to something like 1.1 for the Griff and 1.3 for the Cerbera. Essentially, it means you can run the car as lean as you like in order to reduce the CO content (at the expense of NOx emissions, but they aren't measured) to just below the limit.
A well tuned engine without cats can just about pass the fast idle test using this trick. Lambda isn't measured for natural idle, so the same trick can be employed, assuming the car will actually run.
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