david932 0 Posted February 20, 2009 if i was to fit a set of twin carbs on a post cat vehicle, will it still be tested under the same mot emission rules as a standard model? im concerned that fitting carbs to my car may make it run to rich and fail! Share this post Link to post Share on other sites
Moz_Goodwood 0 Posted February 20, 2009 if i was to fit a set of twin carbs on a post cat vehicle, will it still be tested under the same mot emission rules as a standard model? im concerned that fitting carbs to my car may make it run to rich and fail! if your car was made with a cat then unless its fitted to with an engine maid pre cat (and you have proof of that engine being pre cat) then it will be tested as a post cat motor if your car was made pre cat then regardless of engine it wont be tested as a car with a cat hope this makes sense paul Share this post Link to post Share on other sites
Moz_Goodwood 0 Posted February 20, 2009 if your car was made with a cat then unless its fitted to with an engine maid pre cat (and you have proof of that engine being pre cat) then it will be tested as a post cat motor if your car was made pre cat then regardless of engine it wont be tested as a car with a cat hope this makes sense paul sorry "made" it was late Share this post Link to post Share on other sites
david932 0 Posted February 20, 2009 (edited) yep make sense, so do the people on here running twin carbs run them on pre cat models only? i was thinking along the lines of running carbs on a post cat vehicle. it then occured that the cat would get buggered from the carbs and running a decat would deffo fail an mot! is there any way around this? Edited February 20, 2009 by david932 Share this post Link to post Share on other sites
jplautomotive 0 Posted February 20, 2009 what year / reg is the car ? Share this post Link to post Share on other sites
Sandy 191 Posted February 20, 2009 The regs have been changed recently, so that a post Cat car with a modified engine of any age, is liable to post Cat testing. The manual says: "If an engine has been modified in any way, it still has to meet the exhaust emission requirements according to the age of the vehicle. " But either way, convincing a tester that they ought to do anything other than test according to the vehicle age can be a struggle. Getting them to accept a K-plate car that never had a Cat is a struggle. Share this post Link to post Share on other sites
jengis 0 Posted February 20, 2009 (edited) Yeah, exactly. The test type is based on the age of the vehicle or the age of the engine - whichever is oldest. However, the owness is on the owner not the tester to prove the age of the engine if this is believed to make the vehicle test incorect. Modified engines are no exemption to a vehicle being tested based on age, in any case. Edited February 20, 2009 by jengis Share this post Link to post Share on other sites
jengis 0 Posted February 20, 2009 So to answer your question - yes it would be tested as a cat equiped vehicle (sep 92 on) and almost certainly not pass the MOT emissions test (someone may prove otherwise but they'd be very lucky). This pretty much rules out carbs for road on a CAT car but throttle bodies and new mappable management (££££) would be fine! Share this post Link to post Share on other sites
thefame 0 Posted February 25, 2009 yes m8 being a mot tester myself if u have a car needs a cat post 92 then bodies and management sorts that out no hassle if not u need a nice tester ask MAXI on here Share this post Link to post Share on other sites
marksorrento205 80 Posted February 27, 2009 Getting them to accept a K-plate car that never had a Cat is a struggle. I can vouch for that. I had to get a letter from my local pug dealer to say my car was never fitted with a cat. Share this post Link to post Share on other sites
