[Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

[Dave Dahlgren]

How long does it take for this to stabilize and get good data? I had always
thought and possibly incorrectly that they 4 gas analyzer was fairly slow in
response time. Are they faster now so a 3 or 4 second pull will net good data?
Most of the stuff I work on is pretty highly stressed so I am not so sure it
would live through a 20 second pull at all the points that need to be programed.
Most of the turbo stuff is over 1000 hp for a 3 liter engine the 2.1 liters are
around 800..
Dave

Adam Wade wrote:

> > The NTK wide band will read richer with the same
> > amount of fuel and if timing is advanced to optimal
> > it indicates leaner to the point I am tempted to add
> > more fuel.
> 
> Which is why I don't use an O2 sensor of any sort for
> tuning on a dyno.  While it is a fine toold for what
> it is, it cannot give nearly the depth of data that a
> four-gas analyzer can.  It won't indicate rich or lean
> if the timing is not optimal.  In fact, with training
> in what to look for, it is possible to see when a
> single cylinder is rich or lean from the rest
> (although you cannot tell which one unless you have
> probe ports in each runner of the exhaust manifold.
> 
> =====
> | Adam Wade


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