Anyone with Info on updating a 1.8L to 2.0L?
 

I am interested in knowing what needs to be changed to install a stock 2.0L 914-4 in place of a stock 1.8L 914-4. Specifically what wiring harness changes need to be done and how difficult is it? I assume that the EC needs to be removed from the old motor and the new unit installed, what about the relay box on the side behind the driver's side?

As far as the motor goes, you need the 2.0L top two pieces of tin and the intire FI system with the D-JEt wiring harness and brain.

What I call the "engine harness" is the one with the black plug that goes into the relay panel and has the back-up light switch leads, the starter solenoid wire, the ign +12, the aux air +12, oil idiot sender, tach, and I think thats it. If the L-JEt engine harness has the double relay that is on the battery side hooked up through it then you will need a D-JEt wire harness, or modify the L-Jet one. Also see how the fuel pump is hooked up, it should go through the relay panel and not direrctly to the double relay.

I'm making this more difficult than it really is, Porsche/VW probably made it so that either motor could be dropped in on the assembly line. So I would guess if you unplug the L-Jet and plug in the D-Jet it you should be good to go. I put a 1.7L D-Jet in my 74 that had a 1.8L butchered with a 32/36 Webber carb. So the problems I had weren't from Porsche but from a PO.

You may also need to put some relays into now empty sockets (the middle two) on the relay board, so make sure the sockets aren't corroded.

Yup. You'll need to put round relays into the middle two relay sockets. You'll need the 2.0 motor, complete with engine tin and FI. The fuel pump should not have to be re-wired.

The FI should be complete. ECU (aka "brain box"), the wiring harness that goes from the ECU to the various components (and plugs into the four-pin plug in the relay board), the fuel high-pressure loop (the fuel rail, injectors, fuel pressure regulator, etc.) just about all the way to the fuel pump.

I'm not certain about the one wiring harness JP describes. From the looks of the wiring diagram, it might need to be changed. If you can't get that harness, you can probably use the 1.8 one *if* you run a wire from the fuel pump power circuit to the aux air regulator.

--DD

How about the possibility of installing the L-tronic/AFC fuel injection from the old 1.8 on the new 2.0? I like my AFC but would also like a 2.0, not a 1.8 with bigger jugs.

I have done this conversion on my '75
No real problem, I started a tech article and have many jpg files. I just need to finish it.

As far as a L-Jet on a 2.0 it will work but it does not generate the HP. You will need to figure out the intake manifolds.

IMHO



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Smoke Daddy