[Diy_efi] Timing Calculations
nospam at higginstribe.com
Thu Jun 16 14:26:23 CDT 2005
Has anyone actually made their own EFI on this list, cuz this is kinda
You are basing your idea of injector timing in sequential mode, that it
is a single event, when it is more accurately defined as two events.
One event opens the injector and one event closes the injector. Both
the open and close points of the injector need to be calculated, unlike
in batch mode where you can just modulate the PWM and injection is not
an event at all,
The ignition event is simple, since it's an instantaneous event that
only cares about it's own position. The injector ON event doesn't care
about it's position, it only cares about trying to accurately determine
when to turn on so that the injector will be open for a set amount of
time before it reaches the injector off position. The injector off
position cares about two things, it's position and whether the injector
has been on for the specified amount of time.
Because of the acceleration I have to deal with the on and off event
coming closer together time wise, which will ultimately effect the
amount of fuel. So, the acceleration/deceleration problem will
ultimately effect the amount of fuel , starving it on high acceleration,
which, yes, I'm more worried about that than 1 or 2 degrees of ignition
timing. But, if I fix one, it will work towards fixing the other. Yes,
I know about the importance of ignition timing, can we get over that now?
Adam Wade wrote:
>--- Mark Higgins <nospam at higginstribe.com> wrote:
>>Of course for batch fire it doesn't mean much since
>>there's no individual injector timing.
>That was the whole point. Batch fire vehicles run
>just fine, and make excellent power; in fact, I doubt
>you could tell me whether a vehicle was batch or
>sequential fire, even looking at dyno data with
>Injector timing makes very little difference once you
>get very far above idle speed.
>| 82 Honda CX500 Turbo (Cassandra) 90 Kwak Zephyr 550 (Daphne) |
>| "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 |
>| M/C Fuel Inj. Hndbk. @ Amazon.com - http://tinyurl.com/6o3ze |
>Do You Yahoo!?
>Tired of spam? Yahoo! Mail has the best spam protection around
>Diy_efi mailing list
>Diy_efi at diy-efi.org
More information about the Diy_efi