[Diy_efi] New to list, have a question about speed density and turbos

[Adam Wade]

--- Eric D Byrd <klox at juno.com> wrote:

> if the mix went a little leaner in the 3 or 4 revs
> it took for the system to restore the mix to 12:1
> during transient conditions,

If it responded that quickly, cars would have a TPS
and an O2 sensor, maybe a coolant temp sensor, and
nothing else.

Think about how long it takes for exhaust gases in a
steady-state condition to stabilize with any sort of
gas meter.  Usually it takes about 5 seconds or so for
a four-gas analyzer; for an O2 sensor it might be 2
seconds or so.  Then the fueling has to be adjusted,
and if it keeps adding more fuel trying to get the
leanness to come back up, it'll set up a little
oscillation as it overshoots target first one way and
then the other.

I'm sorry you felt my response was "uncivilized".  You
asked a question that is covered well in the very
basics of how fuel injection works, and the answer is
pretty obvious if you look at how EFI systems are
built for mass-production vehicles.  If they could
save money by doing something a certain way, you bet
your bottom dollar they would, and in a hurry; yet
manufcaturers apparently never do it the way you
suggested.

YGWYPF (tm), and this here mailing list is free.  ;)

=====
| 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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