Going from carb to EFI, some questions. Z20/24 hybrid.

[Spiff]

In a few weeks time I'll be swapping out my J16 engine in my 720 for a  what was going to be a Z20E. But now I have aquired a Z24 because I got it dirt cheap and the Z20 i had was missing the starter and distributor. So I'm gonna be swapping in the Z24 with the Z20E intake manifold and fuel injection. 

 

-What do I do with fueling? Can I just run an external fuel pump on the feed line like the 280Z and 910 bluebird(Z20E) did? I'm not sure if there's a return line on my car but if not I would have to plumb one in.

 

-I have both the engine wiring loom and the harness from the donor car, but I can't find the dropping resistor for the injectors. I do have one from a CA18DET. Will that do? Plugs aren't the same but that's easily changed either by fitting new connectors or soldering them.

 

 

[Lockleaf]

Injectors pretty much run either high or low impedance. The impedance boxes are basically universal, so you should be able to use what you have. That being said, are you sure it needs the impedance box? Could it be that you can't find it because it doesn't use one?

 

Factory fuel injected 720s ran an external in line fuel pump, so installing an aftermarket one outside the tank will basically match stock. Mount it as low as possible close to the tank.

 

Im not sure about the J, but the carb Z engines in the 720s have a return line, so hopefully you are set on that.

[Spiff]

Injectors pretty much run either high or low impedance. The impedance boxes are basically universal, so you should be able to use what you have. That being said, are you sure it needs the impedance box? Could it be that you can't find it because it doesn't use one?

 

No it uses one for sure, I remember I had some issues on a 910 Z20E I had some years ago with the power feed to the dropping resistor and when I was going over the donor's wiring a couple of days ago there was one connector I couldn't account for and thats when it came back to me that this setup uses low imp injectors

[Spiff]

I had a look under my bonnet yesterday but could not find any return fuel line. How hard is it to plumb one in? Is it just a matter of drilling a hole alongside the feed line on the tank and put a fuelpipe in there and seal it up?

[Stoffregen Motorsports]

At first glance, I thought you were removing your EFI and installing a carb. I thought, what an idiot.

 

As far as the fuel pump is concerned, I like to use OEM, in tank pumps. They run cooler, they last longer, they make less noise, etc.

 

If you have the donor fuel tank, you have all the parts you need to make the conversion. Here are two tanks I modified to fit OEM Toyota pumps:

 

Made this:

 

Using these:

 

 

 

And this was a generic tank for my Rover:

 

 

 

[Spiff]

I don't have the tank no, I might have access to a z24 d21 tank though but I'm not sure about the condition of it so I might have to make do with what I have.