analog EFI

[sdelanty at sonic.net]

>>I want to put a MSD ignition module in but I think that this will cause
the efi 
>>ecm to freak out?
>>
>>Am I right in thinking this?

>It may not.  I'm not sure which of the MSD units do the "multiple spark
>discharge" thing to the coil.  I don't think they all do.  If it is a
>multiple discharge type then it probably will screw up the trigger
>signal to the efi unit.  It may depend on the time constant of the input
>filter in the unit.
>Is it not possible to trigger the EFI unit from the MSD ignition
>trigger?  I don't know if this is a Hall effect trigger or the variable
>reluctance type, but it will give you one pulse per cylinder.  It's a
>pity that the MSD module doesn't put out a trigger-output pulse for the
>synchronisation of external EFI units.  (It might do that of course,
>perhaps someone else might know)

 My MSD6A has a "tach output" terminal that gives one pulse per cyl firing.
 I think that would run the EFI just fine.

 Happy motoring,

 Steve Delanty  <sdelanty at sonic.net>

  1971 F100 shortbox, FE390, T-18 4-speed