So engine dynos are not as accurate as you then ?
Siemens have a marginally better spray pattern, nothing massively better.
People who rave about siemens and CL, coilpack etc make me laugh, when it is a bloody expensive way of getting a ECU that is still crap like the L8, compared to a lot of aftermarket ones, the L8 doesn't even when modded do CL with EGT.
I just spent less to get CL(EGT),TC, AL, direct coilpack(no amps), triple map, fan control(X2), fan after run engine run non timer(adjustable to temp or time), tacho telltale,idle stabilisation using ignition advance, adjustable input for DIFFERENT value sensors,AFR target with OL/CL/Adaptive Loop, FULL THROTTLE gear shift, ingear adjustable boost(automatic), AIR CON control(compressor), immobiliser, than it cost for coilpack and CL on a L8.
tabetha