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You should've posted this in the FI forum.  I'm in the middle of changing from the FIC to the EMS. I'm going to get the EMS tuned tomorrow morning.  If all goes well my FIC will be up for sale soon.


The EMS will certainly let you log a lot more things if you want certain data from a track session. It also lets you add the serial guages that can tell you all kinds of things and easily change between them.  You lose your traction control (if you care). 


The FIC on an OBD1 car is kind of guesswork since you can't see the fuel trims so you're making a fuel map and hoping it is right, then letting the stock ECU adjust it.  If you don't do it perfect it acts all kinds of weird and it is difficult to see why since you can't see what the stock ECU is doing.


I see you decided to use the EMS that you already had. The fact that you already had one eliminates one of the FIC's main advantages (price).


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