[Diy_efi] Timing Calculations

[CobraMan]

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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