Additional Injector Controller

[Bruce Plecan]

You might look around for used GN stuff, a company called ATR in South
Carolina made a kit called the 7th injector,  might be a good starting
place, used ones can be had for $100 and that includes a neat injector
holder
B



----- Original Message -----
From: "Ian Habicher" <ihabicher at hotmail.com>
To: <DIY_EFI at lists.diy-efi.org>
Sent: Thursday, March 15, 2001 8:08 AM
Subject: Additional Injector Controller


> 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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