i was just curious because i noticed that mostly all factory turbo cars such as eclipses,wrx's,supras etc. run mass air , and not map sensors. is there a certain reason for this?

 

That's a very good question. A while back, this was covered and there was a nice article about it. Something about how it was easier/efficient for the car.

I'm sure someone has the article somewhere. I would like to know as well.

Don't forget Audi's too.

 

its cheaper and cost effective to use the element heated inside the mass sensor to determine what is going on.

If you ever notice all the upgrades involve switching from MASS AIR to a map based systems. Most of the supras use VPC, Most eclipses as well.

 

You will notice that with force induction, MAF cars require a MAF that can flow the amount of air that upgraded turbos or more boost produce. If the MAF voltage becomes too high becasue of the amount of boost, you need to either trick the MAF into thinking it is still seeing a smaller amount or get a MAF that can handle more flow. Us Nissan guys have to run Mustang Cobra MAF's to run anything past 10 psi. The Mustang Cobra MAF can easily flow enough air for 550-600 whp.