[Diy_efi] O2 sensor sensitivy speed

[Kenny]

Bruce,

> >At idle on a scope, you can see each cylinder,
> clearly (I've seen that).
> >Supposedly, that holds true to about 3K RPM on
> a v8.
> >
> > > So that by you can tune each injector
> individually.

Easier to use an EGT gauge in each exhaust manifold 
runner imo. Also the critical time where uneven 
cylinder filling will cause serious problems is 
generally above 3k. 
 
>Given the proper mechanical answers, I think
> the gains with it are minimal.

Depends on the application. With race engines, 
detecting uneven air distibution into each intake 
runner/cylinder is very critical. High end engine 
managent systems are built with functions to trim each 
cylinder independently for good reason imo.
 
>I'd worry more about individual cylinder tuning
> as a function of detonation
>control rather then just for AFR.  

Yes but lean mixtures and detonation go hand in hand. 
Monitoring individual A/F mixtures and trimming each 
cylinder accordingly will go a long ways toward both 
optimum power as well as detonation prevention. 


> And that's
> mostly about timing (given
>the proper mechanicals).

Isn't it easier to re-trim the injector duty cycle to a 
single cylinder? retarding a single ignition event to 
attempt to avoid detonating seems odd to me when 
richening the mixture to the offending cylinder is 
significantly easier. If ignition advance is the issue 
then it has to be retarded to all cylinders. Letting 
the other cylinders have optimal timing and controlling 
the single detonating cylinders mixture will indeed 
result in performance increases dependent upon things 
like the intake plenum's overall design for example.
-Kenny


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