In the guides you'll finf J333EVO and foxyemz stuff on the 1.4 16v variously into a Cinq and a Sei. The Cinq (which they still have) used a Canems ECU, the Sei an Emerald.
Kristian (Kripit) used a Megasquirt.
I'm not going to tell you it's impossible with the stock ECU, but it'll be a bugger to get it running right. A decent piggy back -- see Honeymonster's thread) like the DET3 or DOY Megasquirt is probably the best way to go.