[DML] Re: DMC Air Filter Housing

["endotex23" <endotex23@xxxxxxxxx>]

> - Lambda was left unchanged (.7 to 1.3% CO is Volvo F spec)<

While I normally ignore much of the huge amounts of wrong information 
on the list I couldn't let this one pass. Any properly functioning 
Lambda system will not allow this high a CO content. The value 
mentioned is for set up of primary mixture in open loop. Any CO of 1% 
or higher will leave a cat converter O2 starved and unable to 
function. Put any decent gas analyzer on a Delorean and if you see CO 
anywhere near that level you have problems. Put a 4 or 5 gas NDIR 
optical bench on it and you can see where the problem lies. The 
Delorean doesn't need EGR because it's NOx values fall within limits 
for that year as long as the engine operates at the correct 
combustion temperatures.

As an emissions tech I'm continually surprised at how poorly people 
understand emission controls on any car, even a car whose controls 
are as simple as this one. Pre-OBD I cars like the Delorean are easy 
to tune and should always maintain a Lambda of 1 during operation 
other than transient conditions, cold enrichment or WOT if everything 
is working correctly. It's mathematically impossible to have a Lambda 
of 1 with a CO content of .7% and if you see that during closed loop 
something is wrong. You should never adjust the mixture screw during 
closed loop because you're wasting your time. All you'll do is push 
the mixture outside the operating window of the emission control 
system with resulting damage to the converter and increased 
emissions. As an aside if you decide to defeat the system and set 
mixture for best power you need to remove the converter.









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