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Since the gas analyser mixes the gasses in the pipe, and
takes 6 seconds to get a fix its almost impossible to
accurately see this.
On the other
hand a GOOD inertia dyno, is so accurate that its easy to
see the difference between rich and weak on the graphs on
the screen... A slightly weak mixture gives a
"slightly jagged" appearance viewed "enlarged" on the
screen. A slightly rich one gives a smooth line when
enlarged but "saggy" in areas when viewed normally.
On a braked
dyno, the RPM can be held steady, so a gas analyser is
extremely useful! A gas analyser that can give a
Lambda reading is easier to read, but requires experience to
use wisely! 1.000 is great at idle! But not under
power! You need to be richer. CO at idle should be
what the manufacturer recommends, and may be really low with
modern engines, like way less than 1 percent. CO
readings of around 4 to 5 percent are generally about right
for full power with naturally aspirated motors!
With Nitrous, or seriously boosted motors all this is
useless! Rich and plenty of boost or nitrous is safe
and fast!
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