[Diy_efi] Timing Calculations
CobraMan at insightbb.com
Wed Jun 15 22:17:45 CDT 2005
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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> Diy_efi at diy-efi.org
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