Thread: carbs to efi: which manifold?

another question is how the traditional cux13 or cux14 efis know the camshift position if they are fully sequentional? from the ignition system?

Originally Posted by russotouristo

another question is how the traditional cux13 or cux14 efis know the camshift position if they are fully sequentional? from the ignition system?

I don't beleive there is anything sequential in the 14CUX.

you mean to say it was continuous?
here's what I'm going to get.




any ideas, what else do I need? idle valve? fuel pressure regulator? MAF?
one more thing: i looked for some wiring diagrams for v8, found one from some early morgan, and they used some power resistors in series with injectors - what for? Do I also need to use something in between the injector and the power switch (transistor)?

That is a manifold from a 14CUX automatic and has the idle valve which is the black thing at one end. It has a fuel rail with regulator which is good, and a Throttle position sensor. All you need are the wring ECU and MAF, assuming the IAC. TPS and the fuel temp sensors are OK.
It is an early AFAIK up to about 93 RRC manifold as the fuel temp sensor is at the front and the regulator at the RH rear.
Regards Philip A

thank you! i was going to use map instead of maf + i need to think about the filtering thing. plus probably i need an air temperatute sensor.
basically, now i am going to find the cux14 wiring diagram to see if there are any power resistors between the efi and injectors. thank you for so much info!

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The 14 CUX does not have the resistor bank, only the old "flapper" system has them. The 14 CUX injectors are high resistance.
Regards Philip A

Originally Posted by russotouristo

another question is how the traditional cux14 efis know the camshift/crank position

How does the 4CUX system know when to fire the injectors?

Thanks

Garry

Originally Posted by garrycol

How does the 4CUX system know when to fire the injectors?

Thanks

Garry

People keep thinking that there's something sophisticated about the 14cux.

There isn't.

It has one rotation signal input, the wire to the ignition coil negative. If there are ignition pulses present on this wire it will dump an approximate amount of fuel in each bank in turn. No error checking, no cam sensors, no fine control. And that's about it.