Here's a wierd one for you...
 

Ok stock ECU guru's, I have an interesting one for you.

A friend of mine bought an Evo8 with an Evo9 motor in it(stock 8 harness and 8 ecu...and a Mitsu dealer did the work!!!). The 9 harness is rediculously expensive and I couldn't find one when we were doing this stuff originally.

I built him a custom conversion harness(https://www.evolutionm.net/forums/sh...d.php?t=339595) and wired in the I-CAS, and the MIVEC spool valve. Took a stock 9 map, put the immob code from his 8 ecu in it, and the car would not start. Tried multiple diff maps, checked all my wiring, nothing.

Today I disabled the immob and the car fired right up, runs just fine. (wow, 70+ wires merged from two different harnesses and they are all perfect...:eek:). The car tuned out fine and is running great.

I'm just really intrigued, why will the immobilizer not work on the 9 ecu in the 8 car?

We have a customer that just did the same thing. Evo 9 motor in a Evo 8.

He however did use a Evo 9 harness and ECU. It's a Evo 9 cosworth stroker with a cosworth Mivec head and cosworth M3 cams.

His immobilizer works just fine. However *I think* he is using the immoblizer that came with the Evo 9 ecu. I believe he had the car rekeyed and the immobilizer unit switched, but I am not 100% sure. I will ask him the next time he comes in.

Man if I ever do a rebuild I am gonna buy a evo9 long block then. Would that pass emissions with it being an evo 8?

thats a good question.. would it guys?..

yes, all the emissions items are the same between cars. Besides you can go newer, but not older.

Back to my topic....