Airflow metering differences

[Shane@DBPerformance]

DSM/Evo and some Toyotas use the Karman MAS. Those honeycombs that are in the MAS are extremely important to it working right. They create vortices that the MAS electronics count. The MAS gives out a frequency signal, which we datalog or see on an SAFC as Hz. A hotwire MAF has a wire that it tries to keep at some temperature and it figures airflow by how much voltage it takes to keep the fixed temperature. They usually put out a 0-5v signal. A 0-5v signal is much easier to work with as far as fooling things go. Some tuning systems don't even support the Karman style input/output. Nissans, Fords, Subarus, and others use 0-5v MAFs, which opens up the door for putting big MAFs on the cars from other applications, custom MAFs, and moving them into the intercooler piping or whatever.