V6 Ph3 engine ph2 ECU - Alfa Romeo Forum
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V6 Ph3 engine ph2 ECU

Hi

I'm putting a 3.0 phase 3 engine from a 166 into a kit car. The original engine has the ECU attached to the rear of the plenum.
From the research I have done it would seem that it is not easy or possible to run the engine in a retro fit application using the original ECU. I'm not using the ABS unit and I can see one of the ECU plugs goes directly to the ABS unit, so I guess this is one of the problems.

My options are to buy an aftermarket ECU like the Omex, which is going to give me versatility for tuning but comes at a cost. 1k for the ECU and then the cost of having it tuned.

The other option I can see is using an ECU from a phase 2 166. I know it is possible to run phase 2 engines with the original ECU in kits, as plenty already do.

I've been offered an ECU, ignition, code box etc from a 2000 manual 3.0 166 for a good price.
What would be involved in getting a phase 3 engine running on a phase 2 ECU?

Obviously the wiring loom is different from the original so I would need to source a new loom, would a 2.5 156 loom be the same, as they may be easier to source?
Do I need to change any sensors on the engine?

Thanks in advance
Nick
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I presume you mean CF2 and CF3 rather than phase 2 & 3?

The differences are marginal. The intake plenum and oil breathers are different between the 2 engines but that shouldn't matter to you.

It's easier to use a CF2 wiring loom and, yes, a 2.5 156 engine loom should work.

Otherwise and posting from memory, without really thinking too hard about it;

The knock sensors are different and I THINK the crank shaft sensor is different. The thermostat housing is different as are the temp senders. The CF2 has 2 temp senders whereas the CF3 has 1.

The injectors are different, I'd use the CF3's with the CF2 management and not worry about it.

The coil packs and cam phase sensors are the same.

Obviously, the lambda setup and the exhaust manifolds are also very different.

I think the oil pressure switch is the same, but I cant remember how this ties into the 156 loom relative to the 166's set up, which uses a dfferent rear mount / oil filter housing.
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(Post Link) post #3 of 3 Old 20-08-14 Thread Starter
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Thanks Chris, that's a great help, cheers.

Yea I do mean CF2 CF3, I thought phase 2/3 was the same, obviously wrong, problems of getting info from Wikipedia!

Thanks again.
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