DIY_EFI Digest V2 #350

[talltom at espace.dcl.com]

Bruce wrote:
> someone mentioned trying to locate fuel flow meter to use for a mileage
> calculator.  Why not have the ecu record the combined pulse width over a
> period of distance, based on the assumption that fuel pressure remains
> fairly constant, a certain distance traveled divided by the time the
> injectors are open == MPG. All is needed is a pulse input from oneor more
> of the wheels,  each pulse = a certain distance ,and the frequency is the
> speed.  The functions necessary to do the computation should be fairly
> easy to develop,  anyone wanna try it ??
>
> Dave J. Andruczyk
>
>
>
 
This is exactly how the trip computers work in the series III Jaguars.
 
- - Bruce

Along with the optional tripmeter on a 78 caddy seville. There's one
wire out of the trip comp that connects to the standard fuel cont. box
on fuel injected models. so trip functions could be added later if desired,
or removed leaving system functioning.