Air Pressure Sensors Analog Output

[TomoHawk]

I was interested in where you can get cool, high pressure air for the intake system, so I thought if I could stick an air-pressure sensor in different places under the hood or even on the outside of the body, I could find a place to get the high-pressure air.  Temperature sensors are easy to find, like a thermister.  A sensor with an analog output of some kind would be easily monitored: I have a neat LED bar-graph board I made long ago, so I could hook up a sensor to that and watch the lights to see what you can get and  where.Thermisters and thermocouples have their own easily-built converters or displays

 But then, it seems that air pressure sensors are either expensive or just hard to find, so I'm asking you all in case  there is a good source.  Can you get one from a modern car?

A pressure switch:    

 

For more information:  http://www.autospeed.com/cms/A_113157/article.html

 

Edited January 25, 2017 by TomoHawk

[Zed Head]

The "CAI" thing is a market mainly produced by K&N.  To go along with their filters that let more dirt in.  Those guys have made their millions selling things that probably do more damage than good.  Most cars already have a remote entrance for air.  Once the car is moving the air in the engine bay is replaced.  With cool outside air.

But, you can get MAP sensors from places like DIYAUtotune.  You'd want two, one to measure a reference point and one to measure the new location.  Just like the O2 sensor, you need software to process the signal.

https://www.diyautotune.com/shop/sensors-data-logging/temperature-and-pressure-sensors/

[TomoHawk]

You are over-complicating things.  You only need the sensor, or in this case, a pressure switch, and no "software" is needed, as you are not measuring absolute values  You only need to find high-pressure places that will close the switch.  I could probably use the old oil-pressure sender if it was sensitive to low air pressure.  The problem here is that the article leaves out information so you can locate a "pressure switch."  The one in the photo is used for aviation, and hardly something you might find in a hardware store.

I still wouldn't want to get air for the intake manifold from anywhere behind the radiator.  You never get enough air too actually cool things.

[Zed Head]

I didn't read the article I just worked from the basics.  If you measure on a low pressure day, you'll get a different reading than on a high pressure day.  If you want to work with a voltage or resistance, without converting to pressure you can do that.

Your assumptions are complicating things, along with unclear thinking.  What's the set-point of your "switch", for example.  If you haven't done your measurements yet then you shouldn't be making decisions about where you'll get the air.  That's how good science works - set up your experiment from sound principles, use good equipment, take your measurements, and draw conclusions.  You've already decided that the engine bay is "bad" without knowing anything.  That's bad science. but it makes a ton of money for K&N.

[zKars]

Is it not ironic that the stock 280z air intake system already accesses the coolest, most easily accessible air available...

[240dkw]

Not sure where your expensive threshold is, but you could look here. The prices are Cdn so you will get it cheaper. What kind of analog signal are you looking for, Vdc or Current? Some of the ones on this page will run off of the 12V system and others need 24V, so make sure to check that as well.
http://www.omega.ca/section_eng/pressure-transducers.html 

[TomoHawk]

5 hours ago, zKars said:

Is it not ironic that the stock 280z air intake system already accesses the coolest, most easily accessible air available...

That is the intent of the test.