Thread: 3.9 v8 into 3.5v8 County

The fuel injection on a D1 has its own wiring harness and needs relatively few connections to make it work. You need a solid 12 volt supply and of course the EFI fuel pump and tank off the Disco to make it go. Should be a DIY job.

easy enough to do but you will have some engineering issues as its an uprated engine so you should by rights also be fitting the equivelent brakes from the donor vehicle (disc/disc all round) but providing it still brakes adequately you may get around that with just a brake test.

its drop in but you will have to fit the EFI fuel lines and pump,

the existing pickup fed with and external EFI fuel pump from an early holden will do nicely. if you dont have a return line just tap one in going back to the tank-fillerneck breather.

Check the fuel lines for both suitability with ethanol fuels and pressure (no using 17psi carby fuel line for the pump-rail line).

Originally Posted by Matt & Jo

Also dose the rear diff off a Disco 1 fit the county ?.

No, your County will have a Salisbury diff which is a completely different setup and is also much stronger than a Disco diff.

Cheers, Murray

Why not run the 3.9 on the carbs from the 3.5?

Originally Posted by Blknight.aus

the existing pickup fed with and external EFI fuel pump from an early holden will do nicely. if you dont have a return line just tap one in going back to the tank-fillerneck breather.

Of course if you don't won't swirl which will lead to stalling out when low on fuel and during cornering etc, you'd also add a swirl pot

14CUX is a very simply, almost standalone wiring loom

Thanks all for the feed back. looks like it can be done. Need to hook up the fuel injection system as i want to run injected gas as well. As for the rear diff, i need to up grade to disc brakes and my old Disco 1 already has diff lockers installed.
I think i have some fun times ahead.
Thanks again for all the replies.
Matt & Jo.