4 and 5 gas EGA assisted / Best Power Engine Tuning
"Air / fuel ratio" wideband o2 sensor and tuning
to an air fuel ratio
When you have had some tuning experience and have seen,
firsthand, the problems that "tuning to an AFR" procedures create - and
have seen how often the better reputation "AFR tuners" deviate from "the
right AFR" in order to end up with a perfect running engine, the
following subjects will make sense.
While an "AFR tuner" can indeed end up with smooth running and best power, the process is significantly different, more difficult and far more time consuming than what every other dyno companies will tell you when they are "selling" you a dyno with a "tune to an AFR" scheme.
Current engine tuning's widespread, low level "theory" is that tuning to "some desired AFR value" will result in clean and smooth running and make the best possible power from an engine. The reality is that once it's tuned to some arbitrary, perfect "AFR" value, you have to (or at least "should") go back through the rpms and throttle positions and literally poke and prod the "perfect AFR" values to make the engine run, if not to best power, at least till the engine runs smoothly.
Example, when a current sportbike (Japanese, Italian,
etc.) engine is "tuned to the right AFR", typically, the part
throttle cruise operation is burbly, rich and inefficient. How do
you fix it? You tell the engine that it doesn't want the "perfect AFR"
and wants something different - and, how much you change it, at
rpm and throttle %, from the "perfect AFR" to make it run well depends
on what the dynamics of the engine are, the ignition timing being over
advanced or over retarded from optimum and the common cylinder to
cylinder fuel "stagger" errors.
When it all comes down to elegance and efficiency in tuning, wouldn't it be more cost effective for a dealer / tuner and result in better and cleaner performance for the rider to tune the engine to where it made Best Power (under Load, which is a whole other subject!) and use the 4 gas readings to help you make rich / lean decisions - and then, when you are done, use the information contained in the automatically logged 4 gas EGA data to help you determine if you should advance or retard the ignition timing or delve into individual cylinder tuning?
EPA does NOT ALLOW the use of "wideband o2 sensors" to
Digital 4 gas EGA systems are not affected by
Digital systems CO, HC and CO2 mass spectrometer
equipment rarely fails in use without warning.
(funny story, I once flagged down a guy
on a gsxr and told him that if he was going to continue to ride by my
house every morning at 6:30am, that he could bring his bike over and I'd
retune it for free, just so I could get up to the sound of a good
running engine instead of his "custom tuned by a "trained" "official
center's" overrich map.
Digital systems use O2 as just and only as an indicator of how
much oxygen is left.
Funny story and AFR Tuning:
All they can do is tell you that
your so-called "A/F Ratio" is "all messed up... but it makes good
If you read this page, there's
another funny story about another local race friend, Steve Rapp's bike
and Road America. :-)
Marc 415 491 5920
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|The extension of the laboratory
for engines of the Swiss Federal Institute of Technology was completed
in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940).
He had a successful career in Berlin but returned to Switzerland after
the advent of the Nazis. His architectural style was somewhat similar
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