| Weber-Marelli IAW P7 ECU
851, 907 and early 888's up to serial number 000508.
Weber-Marelli IAW P8 ECU
Later 888's from serial number 000509, 916 Strada, 916SP, 916SPS, 996SPS
The basic reason that the P8 has better performance is that the two cylinders can be fueled independently and differently to compensate for combustion chamber temperature differences caused by a reduced airflow pattern across the vertical cylinder. Consequently, P7s can't use the EPROM's rear cylinder fuel offset map. |