Originally Posted by
orionmojo
I was also told the S1 ecu was better for above reasons. they also have a higher rev limit i believe. An S2 will run on any Ecu, but an S1 will only run on an S1 ecu.
Later ECU's need a knock sensor, or will run like a bag of shit. S1 or V early S2 is the best as no knock sensor, the knock sensor circuit very often removed timing for fun.