[Diy_efi] sequential injection timing

[Eric Fahlgren]

Bruce wrote:

> Nope, your assuming facts.

Of course. :)

> Very few people really take the time to Correctly dial in their EFI.
> Very often folks wanna go to a aftermarket EFI, why?, cause it's easy to
> tune, easy as in few tables switches and settings, all of which are
> compromises.

Well, every design has compromises and most people don't have either
the inclination, competence or time do everything right.

> It's the same mind set that gets a EFI just right as would get a Weber just
> right.
> 
> Simplier?,
> No,
> redrilling a hole in an emulsion tube isn't rocket science.

Ok, but I still contend that the learning curve is such for carbs
is much steeper than for EFI.  It's like that old joke: the furnace
is broken for months, and the in-house repairman can't fix it.  The
expert is called, he walks in, looks around and then whacks the thing
with a hammer.  The furnace runs great, then the bill for $5000 arrives,
and is promptly returned to the expert with a note, "Please itemize."
The expert responds "Hitting furnace with hammer $5, Knowing where to
hit $4995."

So, if I ask you why you redrilled the one of the holes on the emulsion
tube, will you say "because that's what has always worked before" or
will you say, "here is the theory behind this particular circuit on
this model, which specifies that this hole ..."

My guess is that most carb designs evolved empirically, and have little
or no methodical theory underlying their sum total operation (this is
neither good nor bad, it's just the way it is).  This leads to the
"expert" mode, where you need to do it a bunch before you have any
sort of basic understanding of what is going on (and you might never
have a true cause and effect explanation in numerical terms, again
neither good nor bad, but harder for those of us who like equations).

On the other hand, I think a fairly good basic understanding of EFI
(NOT tuning) can be had by anyone who can say pv=nrt.  This gives
them a leg up because they aren't learning the two things at once,
namely identifying the goal and then working out how to get there.

So, remember back when you first got the WB-LEDs working and you
reported to us, "It makes tuning almost too easy"?  Well, I think that
part only makes identifying the goal part easy, now you actually have
to "know where to hit," which is where I argue that EFI is better than
carbs, it further separates the various tuning functions (cold enrichments,
AE, and so on) so that you can more easily tweak a single aspect of
the tune (in other words making it easier to know where to hit).

> You really haven't worked with Webers have you?.

Absolutely correct, my experience tuning carbs was limited to Mikunis
on 2-stroke bikes and SUs on 4 banger cars, way back when I was young.
(But by pretending to know something, I'm learning a lot from you. :)

Eric

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