throttle body mounted mas

[1stGenRocks]

hey i was working on a 97 ford contour the other day and noticed that the mas on it is a inline style mounted in the intake tube. what im wondering is whether anybody knows what kind of car has a inline mas with the right sensors to adapt and mount at the throttle body of a 1g turbo so you can vent to the atomosphere right. also i need to know whether the computer will work right when its getting pressure and temp reading after the turbo instead of before. just wondering because a junkyard mas from some other kind of car has got to be cheaper then any other way we have to vent

[1stGenRocks]

oh btw the contour was a 16v zetec 4 cylinder and the mas had 3 wires coming out of it

[kjewer1]

Yes, its called the MAF Translator, and uses GM 3" or 3.5" MAF. YOu can buy them from www.fullthrottlespeed.com (forums at www.fullthrottletech.com) and www.slowboyracing.com, for example. Search for "MAFT" on the various DSM forums, and you will get more info than you want

Hope that helps.

[EclipseRST]

i have a simular question reguarding the MAS being next to the throttle body... if you were to move the MAS right before the throttle body would that solve the richness problem with venting to the atmosphere, right now i dont have the problem but if it occurs in the near future or if someone else would like to vent their BOV would it work? just something i have been pondering and trying to find info on for awhile now but since there is already a simular thread i figure why not ask! if no one has heard anything about it or kevin if you dont think it will fuck with my motor i think i am goin to try it just to see what happens! anyways any input is greatly appreciated!

[kjewer1]

You cant pressurize the stock MAS, thats why no one has done this. Without getting too far into Karmen Vortex theory, here is how the stock MAS works. There is a restriction in the MAS that creates turbulence, in the form of recurring Karmen Vorteces. These are "counted" by a sensor in the MAS. In this way the VELOCITY of the air in the metered section can be extrapolated. The cross sectional area of the sensor is known (unless you hack it, thats why hacking htrows off the readngs) so you can come up with some volume measurements. The MAS also has temp sensors and pressure sensors which allow the ECU to convert the information from the MAS into an air MASS. Hence the term, Mass Airflow Sensor.

You cant setup the karmem vorteces if the air is pressurized.

The MAF used in the conversion is a Hotwire sensor, which uses the speed-density theory. A hot wire is suspended across the sensor. As air passes over it, it carries away some of the heat from th wire. The voltage/current reqired to maintain the temp of the wire is measured. The good thing about this system is that everything affects the temp of the wire. Speed of the air changes? more or less heat will be carried away. Temp of the air changes? More or less heat will be removed. Density changes? higher density means more molecules to remove heat, and vice versa. Hence the speed-density terminology.

This sensor CAN be pressurized, since presure is accounted for in the measurement.


Hope that helps answer some questions.

[EclipseRST]

holy shit... i had to read that 6 times before i understood that! but now i get it... thanks!

[BoostedSpyder]

i love it when Kevin drops some serious knowledge on us...

[RiceRocket18]

LOL.... 7 times.... and still reading.

[guitarXgeek]

Kevin is pure genius.

[scottsee]

humm, excuse me while i go get my dictionary

[BoostedSpyder]

the funny thing is that he probly wrote that in like 2 minutes, and it took most of us 10 to comprehend it...

[kjewer1]

MAybe its so hard to understand BECAUSE I tossed it together too quickly... Hmmm I know I have written somehting up before on the subject, if I think of it later I'll look for it.

[RiceRocket18]

i think you can make a living by giving lectures already Kev.