underscore wrote:If everything bolts up like alltracman says I'm guessing you could just use the 3rd gen shortblock with the 2nd gen ancillaries/wiring/etc.
Why would you want to use just the short block? That's loads extra work for absolutely no gain. Any harness work is much less than removing and swapping heads..
Use the whole 205 engine along with the alternator because it's higher output than the 185 alternator.
If you don't feel like a mess reuse the 185 pwr steering pump and compressor.
But yes, you can use the 185 harness. It's a little ghetto unless you cut into the harness ( that's a discontinued part) but you can add in jumper harnesses for the few things that don't directly bolt up, like the MAT sensor.
You don't need to wire in the level switch, just ground the switch wire at the ECU. Much easier.
That is the exact same process for the 185 RC ECU.
I'm not sure how complicated wiring the Bosch pump to defeat the code would be, if you even could. The resistances may be different.
Much easier to build the circuit.
The MAP sensor hopefully came with the engine. If not you'll have to buy one somewhere. One from a 3rd gen MR2 will also work.
It attaches the same place the 185 one does, physically looks the same too.
It reads manifold pressure, not airflow, so it doesn't go in the intake tract.
The RC stuff would probably work, but you'll most likely lose some power; the 205 engine has lower C:R than the 185 engine.
It's not hard at all to do the 205 stuff.
Yes, all extras work fine. They're not as linked as they are in newer cars.
The wiring is going to be harder. You can't easily reuse your 185 harness?
You can't just bolt in your IC to a 5th gen engine, it's a side feed manifold. I don't know how close the IC will bolt into the 4th gen. Possibly bolt right in?
I assume you already own a 3rd gen?
The exhaust manifold and turbine are 1 casting. Much harder to mess around with the turbo. However IIRC you can swap a 205 manifold on.
Other than that, not really.