[Diy_efi] closed loop system for boost

[Eric D Byrd]

Thanks Paul,

Appreciate your taking time to answer.  But I was thinking, if fuel
control under boost is about cooling, then a decent IC, with water
injection perhaps, might make possible the cooling needed without
resorting to rich, and more importantly to my mind, dirty fuel mixtures. 
The Mitsi injectors sold by Zdyne for use with their programmable ECU can
squirt 450 cc/min.  If the fuel mix being 12:1 instead of 14.7:1 is
sufficient to safeguard a motor, then even at full blast, the injectors
are putting out about 20cc/min more than stoich.  If my understanding is
right, water can soak more heat than fuel.  It would not be difficult or
costly, or even drastically reduce air mass flow to inject enough water
to provide the cooling that a rich mix provides.  The catch is, of
course, water doesn't burn, so you will get about 20% less power because
of the fuel you are replacing.  But it will be clean.

Yeah, I realize there is currently no closed loop fuel system for boost. 
But what are we all here for, on this list, but to create some EFI system
that is not available?  Without exception, every technological advance
ever achieved, was achieved by somebody trying to do something never done
before.  To point out that it's never been done is sort of redundant, and
doesn't make much sense.  Just because it *hasn't* been done doesn't
prove it *can't* be done, or that it's a waste of time to try.

And I realize most guys consider emissions issues a nuisance.  But I feel
this is short-sighted and self-defeating.  We have emissions laws because
we have too many emissions, and if we don't take some care that our
performance engines run clean, the legislators will eventually come after
us instead of just continually tightening mass production emissions laws.
 It reminds me of that Rush song, "Red Barchetta", about the young guy
who outraces the cops, in a future where petrol-burning cars are outlawed
completely.

> Hello Eric,
> 
> Remember most system only operate closed loop at less than 30% 
> throttle and 
> the O2 loop is not designed to correct bad fuel mapping.  There are 
> no "self 
> correcting" closed loop systems for turbos under boost.   Fueling 
> under boost 
> is more about cooling that maintaining a narrow chemical balance for 
> the 
> efficiency of a converter.
> 
> 
> Paul

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