1991 TVR 400 SE (Rover engine)

[beduch]

I need to know what the CO2 reading should be for Hotwire 1991 TVR 400 SE (Rover engine)
Is 1.63% about right and which way decreases the C02 reading, clockwise or anti clockwise
At the moment the exhaust tale pipe is always black even after a good run, not grey
Also if adjusting the Co2 does it affect the mixture all through the rev range or only at tickover

>>> Edited by beduch on Wednesday 26th March 07:08

[2 sheds]

Are you sure you want to adjust this ? , the tail pipe colour can be misleasing, the grey colour often associated with "clean burning" was contributed to by the lead/ fuel additives,
As the 400 has a fairly hot cam going too low with CO will increase hydo-carbons,its a fine balance, i've never set up a 400, but 450's need about 3% or more .
The idle mixture only affects closed / low throttle running.
Basically if it runs OK i wouldn't suggest adjustment .
Tim

[Boosted LS1]

I'd second what Tim says. If you want to check the idle take it to a mot testing station and ask them to adjust it for you. What do the plugs look like?