[Diy_efi] Timing Calculations

[Mark Higgins]

Has anyone actually made their own EFI on this list, cuz this is kinda 
annoying.

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?

Mark Higgins

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
>four-gas analysis.
>
>Injector timing makes very little difference once you
>get very far above idle speed.
>
>
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