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

[Dave Dahlgren]

When you use the 4 gas machine do you get different readings when the timing is
incorrect? or does combustion seem normal but the power is down? Can you
illustrate the set of conditions and what you might see and then if you moved
the timing what might happen to the readings?? I am thinking that the WBO2
reports what it sees but what does the 4 gas see in the same situation that
would make you think that it is timing related rather than fueling related. The
WB is seeing inefficient combustion hence the A/F ratio being skewed what
parameter in 4 gas would say the fueling is correct but the timing is off?

Dave

Adam Wade wrote:
> 
> --- A6intruder <A6intruder at adelphia.net> wrote:
> 
> > I understand that the 4-gas gives more info than a
> > WB, but for those that don't have access to a 4-gas
> > a WB can still be very useful.
> 
> It can also be misleading if you are not careful.  I
> would say it is substantially better than nothing for
> roughing in a map, and is useful to varying degrees in
> a number of different tuning situations.  However, for
> adjusting fueling, your BEST tool will always be
> residual CO, over residual O2.
> 
> > Below you discuss that the WB changes as you change
> > timing at a given data point.  Of course it does,
> > the WB is only reporting what it observes.
> 
> Fair enough, as long as you can somehow figure out
> what optimal fueling is based on knowledge of the
> behavior and your timing map.  For my dollar, it's far
> easier to get a single quick reading that can tell me
> a very great deal without having to guess or
> calculate.  Since I doubt any of us own or build our
> own dynos, we all rent time on them.  For that reason,
> I would recommend renting time on one that gives you
> the best "bang for your buck", if you wish to run on
> one.
> 
> > Now you will have to decide if your resulting do
> > have to change A/F again to achieve your A/F goal.
> 
> Exactly.  My point was that with a four-gas, you can
> tune for best fueling, even if the vehicle could make
> better power via timing changes.  It makes it a LOT
> quicker for many people when on the dyno.
> 
> > My only point of entering the discussion is for
> > those without a 4-gas not to discount the usefulness
> > of a WB.
> 
> Again, understood.  More of a "horses for courses"
> argument on my part, and I think I've already
> mentioned the utility of the device more than once.
> 
> =====
> | Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
> |   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> 
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