[Diy_efi] Running extra injectors off a stock ecu

[bcroe at juno.com]

Eric, 

The rate you add or remove energy from a magnetic circuit 
depends on the applied voltage.  You opened it with 14 volts.  
Letting the current kick into a 1N4004 will only give .7 volts, 
so the rate of decay will be a dozen or so times slower.  The 
release time will therefore be slow.  

There are other losses, like the coil resistance, which help the 
decay.  Low resistance peak & hold injectors need the high 
voltage kickback the most.  

Letting it kick into maybe a large 40 volt Zener across the 
transistor (or equivalent circuit) will speed the magnetic 
collapse, before it can close.

Bruce Roe

On Mon, 02 Dec 2002 09:23:52 -0500 "Eric.Fahlgren"
<eric.fahlgren at mscsoftware.com> writes:
> Bruce,
> 
> Ok, time for me to get some education.
> 
> Is this because there is a reverse voltage ring on the injector
> coil?  Would this be made better by a zener to ground?  Would the
> best solution be to have a pair of signals, open and close, which
> control two transistors one for each of the modes?

> Eric

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