Nevertheless, while this may not be a reading that can completely state the airflow your car is taking in, it can provide a good estimate. Input I have collected from tuners suggest that this is not a direct measure and depends on other sensors, so programming may be able to affect the g/s independent of changes to actual airflow. This channel measures the grams per second or airflow taken into account by the MAF sensor. To determine if the vehicle is having to remove or add fuel to achieve that a/f you would rely on this channel. To determine the actual a/f that is being requested and achieved you would defer to channel 31. This channel displays the deviance or the correction from the a/f that is requested, but if the incorrect air/fuel is requested by the programming than one could still be running an unsafe air/fuel ratio and the computer would not correct for it. Note: This channel can not be substituted for channel 31 which displays the actual air/fuel ratio. Remember that lean is your ultimate enemy. Numbers upwards of 20 indicate some real problems that bear much closer attention.

Negative numbers indicate fuel is having to be removed to compensate for a richer condition. Positive numbers displayed indicate fuel is having to be added to compensate for lean conditions. Note that seeing numbers higher than 0 does not necessarily mean your car is running dangerously rich or lean just because of a little correction. The computer can correct for these rich and lean conditions up to 25% or so. No fuel is having to be added or removed to maintain harmony. This means the car is doing what it has been asked to do. The numbers will be displayed as a percentage starting from 0% indicating NO fuel correction is needed. This is a fuel correction table used by the computer when it senses the car richening and leaning from the programmed air/fuel tables. Any lifting of the throttle during the run will result in inaccurate A/F numbers for the purpose of our evaluation. Note: In order to have a log that will be valid, you will need to see at least a 3rd gear wide open throttle run from about 2500rpm until redline. VAG-COM Datalogging for MY2001+ Audi/VW Vehicles. Vag-Com Reference Page - Note that if you are unsure of how to execute logging functions please see the following page on this site.

Vcds advanced measuring blocks list