[Diy_efi] Timing Calculations

[Daniel R. Nicoson]

Injector timing

Just this past week several guys were moving their injector timing around
quite a bit on the EEC Tuner list.  They can move the injection points quite
a ways (one revolution or more) and while it may affect power and
drivability the car runs and makes a major portion of it's power.

Spark timing 3-5 degrees off will make as much or more difference in power.

My $.02,

Dan Nicoson


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of CobraMan
> Sent: Wednesday, June 15, 2005 11:18 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] Timing Calculations
>
>
> Ignition timing is much more important than injector timing - if
> not, how do
> batch fire engines even run?swap the injector wires and nothing seems to
> change - swap the ignition wires and see what happens.  TomS
> ----- Original Message -----
> From: "Mark Higgins" <nospam at higginstribe.com>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, June 15, 2005 9:57 PM
> Subject: Re: [Diy_efi] Timing Calculations
>
>
> > Before people get off on more of a tangent with 60 tooth
> trigger wheels.
> > Thanks for all the discussion and calculations.  I also want to factor
> > that all of your calculations are based on the worst case
> scenario, that
> > timing will come at the farthest point from the trigger wheel.
> Obviously
> > the deviation from the actual and desired event time will start
> at 0 from
> > the trigger point and reach the greatest error just before the next
> > trigger point.
> >
> > Anyway, it seems pretty obvious to me then that I should build in some
> > sort of rpm prediction calculations, possibly based on throttle
> (or MAP)
> > changes if I want them to be quick.  Of course, I'm more worried about
> > injector timing then ignition timing.  I can't move the
> injector off time
> > (or at least I shouldn't, much) which means I need to fairly accurately
> > predict the on time based on what I currently know about the
> > acceleration/deceleration, and I need to predict that on time, possible
> > most of a engine cycle ahead of the injector off time.
> >
> > This means I'm going to have to sit down and seriously think about the
> > logic I'm going to use to reduce this problem as much as possible.
> >
> > Thanks everyone.
> >
> > Mark Higgins
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