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Old 3rd Apr 2011, 7:28 am   #2
Sean Williams
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Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
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Default Re: *analog* engine injector controller questions.

I think this thread is likely to be closed soon - its not exactly in keeping with the forum...

However,

It would help if we knew which vehicle you were referring to - My guess is Ford based.

I have to ask, why reinvent the wheel? there are several options available over here for controlling ignition, all fully programmable via USB, and easy to retrofit to most vehicles.

1987 is hardly a long time ago - so repairing the original system should not be a problem - parts must be available somewhere.

As for building your own.....

You have identified a number of inputs required to control fuellling accurately - none of these will be easy to replcate in an analogue fashion.

Early fuel injection systems were mechanical, and as such had vacuum compensation applied to the metering head to allow higher fuel rates under acceleration - think Triumph TR6, early Volvo 2 and 7 series, and Ford Escort XR3I.

While these systems worked to an acceptable limit, they were nowhere near as good as a late system that had electronically fired injectors, and a proper computed fuel and ignition curve, running in a close loop system.

So, in a nutshell, either repair what you have - this will be safer, and more reliable., or invest a good chunk of change in a professionally manufactured system.

HTH
Sean
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