Quote:
Originally Posted by island911
MFI is not measuring air flow, whereas CIS does. This makes the CIS perform better from fuel/air metering POV, But... on higher output engines, the cam timing has overlap . . which induces bad flow at certain rpm ...which confounds the air flow measurement. -a modal thing.
So, yes; "much inproved CIS fuel injection" . . but at a cost of a more broadly rev-range tuned motor.
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MFI still compensates for altitude/pressure and has a warm-up circuit, so there shouldn't be much difference between the calculated airflow and actual airflow. If anything it would be lean because the air leaks in worn throttle bodies let more air in.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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