Additional Injector Controller

[Ian Habicher]

Hello,

I have a 1987 Mazda RX-7 and wish to retain the stock fuel injection.  I 
want to build a simple controller that will pick up at 8 PSI where the stock 
EFI leaves off, and drive 1 large extra injector to provide the extra fuel 
I'll need under higher boost.

Ideally the threshold point should be adjustable, i.e where the controller 
starts to open the injector, as determined by the boost sensor voltage.

Also the 'slope' or rate of pulse width increase with rising boost sensor 
voltage needs to be adjustable.

I'm not trying to win any awards for emissions control or fuel economy, just 
provide more gas when I need it under boost.  A linear slope will probably 
work fine for this.

I have heard that a 555 chip or similar can be used for this.  Has anyone 
done this, and are you willing to share?  I don't want to re-invent the 
wheel here :)

Thanks in advance,

Ian Habicher
1987 RX-7 Turbo II

ihabicher at hotmail.com
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