Congrats. I feel as though your expenses for the engine swap have only begun, but good luck.
I do not KNOW, but would be willing to bet you would need an ///M3 ECU. The S52 engine is considerably different from the M50 or M52, but I would assume that you could still do the OBDII-OBDI conversion if you could find all the necessary parts from an S50 engine. Either way, your gonna need an ///M ECU.
I will be soon looking for a new motor for mine.... My M motor has about 160 on it... no problems mechically since it was born.. besides I replaced the water pump... she kicks ass... has some work done to her.. but I really want a euro spec... But I'm at a lose for trying to find one in the US....
Have you come by some while looking for your motor?..
I've seen 2 euro specs motors in the us selling for 10k over the east coast... not worth it :P
I'm fucking dead tired as I left at 11pm last night and drove 7 hours to kalama, wa. then slept 2 hours, loaded the engine, ate and then drove another 7 back. here's the pics... note, I took off the valve cover to clean it when I got home... It got some grease on it..
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