[Diy_efi] Timing Calculations

[Mark Higgins]

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