VH5150

Do you guys perfer to tune in OL or SD???

Explain the differences between the two...

Also how does OL still allow the MAF to influence fueling....

THANKS

superls1

Do a search, you'll find lots of info.

Don't confuse control strategy

Open Loop (OL) vs Closed Loop (CL) which is wheter or not the PCM will use the O2's to provide feedback information to adjust fueling (Closed Loop does this)

with air metering strategy

MAF vs SD - The MAF is a device that simply measures the mass flow of air entering the engine regardless of wheter the car is in open or closed loop. SD is process based on the ideal gas law in which the primary factor that is determined (or modified) is the volume of air entering the engine based on MAP and RPM (or at least the estimation of air entering the engine i.e. Volumetric Efficiency)