what's the difference between these 2 ecu's?

[turboblack2door]

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[absolute_DSM]

Black boxed one is a 98-99 and the other is a 97.

The 95-96 may look the same but always check the PN as the CAS signal is inverted from a 97-99 signal.

 

[turboblack2door]

hmm they both came out of 97's one just came out of an auto coupe the other out of a spyder 5spd both gst's

 

[absolute_DSM]

I believe they are interchangable without an issue, which is why you found a 98-99 in the 97, someone correct me if Im wrong.

 

[turboblack2door]

i'm running the 97 auto ecu in my 5spd right now and no issues other than what i've had before

 

[steve]

There is not difference auto or manual when it comes to 2G turbo ECUs.
CAPS says the black MD346675 was used in 1998 model year FWD cars build between 7/97 and 5/98.
The older metal cased MD335287 was used in 1997 MY FWD cars built from 7/96 to 6/97.

As you have discovered they are largely interchangeable. I don't think there were any special engine changes between 97 and later but the plastic cased ECUs introduced in the 98 cars were a change to newer technology and cheaper to build.