Homebuilt systems like Tracy's are great and work just fine.  The biggest
advantage that I see is the tunablility of the system and the

availablilty at a reasonable price due to using auto parts.

  Another unmentioned advantage of EFI over mechanical injection is the
ability to tailor duty cycle on individual injectors in order to optimize
fuel flow to each individual cylinder (or rotor). To get the equivalent in
an MI system requires flow matching of each individual injector such as
GAMI injectors. I think a set of GAMI injectors for an MI system cost more
than my complete EFI system will.

Mike Wills

In the case of an aircraft engine you will also need a EGT CHT scanner to accomplish
that and they are not cheap. I don't think Tracy's system can taylor individual injectors.
Is there a EFI system out there that can do that? The potential is certainly
there.

Paul Lamar
 
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