[Diy_efi] Low tech fuel injection system

[Steve Ravet]

> Now I'm chasing a new project. I've turbocharged a 1987 Yugo=20
> and have been=20

Wherever Yugo, there you are.

> I'm wondering if it's possible to build a functioning fuel=20
> injection system=20
> by controlling the injectors in stages which would be mounted=20
> below the=20
> throttle body with the throttle positioning switch. Basically like a=20
> carburetor but without a fuel bowl. Such as have one control=20
> the idle, one=20
> for midrange and one for WOT and Boost. Who knows one single=20
> injector may=20
> be all I need.

what HP are you talking about?

> I'd also like to know how the injector on a GM throttle body=20
> works. Is it=20
> on or off like a pulsed system or is it continuous and is=20
> controlled by=20
> fuel pressure or some other means.

GM TBI injectors are pulsed.  They're low impedance injectors, so need a
peak/hold driver circuit.  TBI systems use RPM and MAP as the basic
inputs, with corrections for temperature, delta MAP, delta TPS (throttle
position).  They incorporate an O2 sensor to provide feedback for fuel
trim.  If building a system from scratch isn't one of your goals, then a
GM system may be a good starting point.  GM built a turbocharged 4 cyl
sunbird that you could look at.

--steve


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