A metre of black snot! TADTS - really?
Discussion
It's just a tad rich on idle; mappers often do this as it's easier to get a stable idle on the rich side. You can achieve the same stable idle with less fuel (and no black marks) but it takes a bit more time to get right. Mine actually managed to pass an MOT with a supercharger and no cats a few weeks ago purely as it has the fuel tuned to be lean(ish) but stable on idle.
450Nick said:
It's just a tad rich on idle; mappers often do this as it's easier to get a stable idle on the rich side. You can achieve the same stable idle with less fuel (and no black marks) but it takes a bit more time to get right. Mine actually managed to pass an MOT with a supercharger and no cats a few weeks ago purely as it has the fuel tuned to be lean(ish) but stable on idle.
and mine managed to fail an MOT on emissions with new cats fitted and a so called MOT map - back to the engone builder and his turnkey solution for me - Lambda all over the place!roseytvr said:
and mine managed to fail an MOT on emissions with new cats fitted and a so called MOT map - back to the engone builder and his turnkey solution for me - Lambda all over the place!
It's all in the mapping - a bad map can make a great car feel like crap. I've used a few and frankly the only one I'd consistently recommend is Emerald - they really do know what they're doing.
450Nick said:
It's all in the mapping - a bad map can make a great car feel like crap. I've used a few and frankly the only one I'd consistently recommend is Emerald - they really do know what they're doing.
That may be true but .........you cant MAP your car Nick to go through an honest CAT test its just not possible (with no CATS fitted) to reach Lambda while keeping other readings in spec i.e CO HC your testing stations machine needs calibrating no question 
but you got your test so that cool 
basically you tune for one reading while the others go through the roof you just cant pull them into line for the CAT test (you can get close but) if you could the manufactures would have been doing it cat-less years ago whilst saving millions and modern engines are so much more cleaner/efficient combustion wise than the old RV8. Not a knock mate just an observation 
Edited by Sardonicus on Saturday 23 August 22:45
roseytvr said:
Anyone else get this? In fairness its mainly condensation and dries up fairly quickly but I cant recall my original engine doing it. Mapper tells me not to worry!!
Yep, regular feature.... Ruined one pair of nice trainers whilst engine warming up and putting roof in boot Have always thought it would be fun to park in front of a nice shiny white Porsche overnight... 'Oh, sorry mate, didn't realise I'd parked quite so close'
OK, that's really childish, and I'd never do something like that..
Sardonicus said:
hat may be true but .........you cant MAP your car Nick to go through an honest CAT test its just not possible (with no CATS fitted) to reach Lambda while keeping other readings in spec i.e CO HC your testing stations machine needs calibrating no question but you got your test so that cool basically you tune for one reading while the others go through the roof you just cant pull them into line for the CAT test (you can get close but) if you could the manufactures would have been doing it cat-less years ago whilst saving millions and modern engines are so much more cleaner/efficient combustion wise than the old RV8. Not a knock mate just an observation
True, but I thought the emissions regs were much much looser for a 1990's TVR than anything new... I have seen it nearly pass before without any special tuning and have heard of plenty of other cars doing similar. I usually just take it to a mates who holds the probe several feet from the exhaust to be sure, but this time the MOT inspector turned up while my car was being tested so they had to do it the legit way. Expected a fail and it actually passed without any problem! but you got your test so that cool basically you tune for one reading while the others go through the roof you just cant pull them into line for the CAT test (you can get close but) if you could the manufactures would have been doing it cat-less years ago whilst saving millions and modern engines are so much more cleaner/efficient combustion wise than the old RV8. Not a knock mate just an observation Edited by Sardonicus on Saturday 23 August 22:45
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