ecu voltage problem

[Brad Sheridan]

>
>What kind of regulation circuitry are you using to drop
>the voltage from the automotive 12 volts to your circuit.
>Keep in mind that your regulator needs to be able to deal
>with voltages as low as 8 or 9 volts (cranking) to over
>15 volts, with voltage spikes maybe as high as several
>hundred.  A resistor/zener or varistor input could squelch
>the spikes (lo-R so you don't lose voltage from current
>drain of circuit).  Put this before your regulator.
>In-line inductors (chokes) work also, but they can
>get big.  Also consider you may have some sort of
>ground loop going on.

  Another thing you will need to check is that your alternator is
supplying enough juice to power the injection and injectors. Do
you have any other electronics running? I know from personal
experience that running the EFI, rad. fan, and a compressor for
an air shifter can be too much for it, and it sucks finding this out at
competition. Even if this isn't your problem, its a good idea to
double check it. Placement of the EFI can make a difference, and on an
Accel DFI, putting it in the cars sidepod(1.5+ feet from the engine and
coils)
seemed to work well enough.

Brad