Base Freq. for water injection

[Clare Snyder]

Frederic Breitwieser wrote:
> 
> >> I'm playing with water injection at the moment very basic setup Boost
> >> switch activating a 555 circuit driving a fuel injector.
> >> Q. What freq should I run the injector at ?
> >> I'm tuning it by changing the duty cycle
> 
> If you have one water injector per cylinder, then have it fire off the
> signal from the existing fuel injector, with a much smaller duty cycle,
> which is determined by RPM or some other charactoristic.
> 
> If you do not, you can tap each injector's pulse lead, sum the inputs, and
> use that to trigger the 555 timer to fire the water injector in the
> throttle body.
> 
> Frederic Breitwieser
> Homebrew Automotive Mailing List
> Bridgeport, CT 06606
> http://www.geocities.com/MotorCity/Downs/4605/index.html
> 1989 AG Hummer 4-Door
> 1993 Supercharged Lincoln Continental
> 2000 Mid-Engine Sports Car <smile>
> 
> ---
Why sum the signals? just fire the water with the injector on  a batch
fired system - every second injector pulse? or with every spark from the
ignition tach signal. You could even drive a high impedence injector
directly off the fuel injector signal and adjust water pressure to
adjust flow. You guys all want to make simple things difficult. Why,
even a windsheild washer pump with a solenoid valve (read that as
injector) connected to come on with knock and shut off when knock
dissapears would modulate itself quite nicely if injector size and
pressure were properly determined. You know, knock means squirt, no
knock means shut off. You get a slow pwm, self regulating and timing.
Err on the side of a wee bit more water, or a bit earlier in detection
to prevent making aluminum paper weights.
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