Tape a barometer to your hood? YES! - Fuelly Forums

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Old 08-07-2009, 04:33 PM   #1
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Tape a barometer to your hood? YES!

I'm not sure what to make of this, but I found this web site that sells USB data loggers that record barometric pressure. They taped six to a car, drove around, then later downloaded and graphed the results. They also went over a high bridge so you can see that in the results too. Here's a linkie:

http://www.gcdataconcepts.com/carairflow.html

Thought I'd post it and let the hive-mind ruminate on it. A bit bizarre, but maybe one "could" use this technique to asses effectiveness of grill blocks?

Well, Enjoy!
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Old 08-07-2009, 05:02 PM   #2
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The price is pretty high. I thought OBDII can report barometric pressure.
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Old 08-08-2009, 03:42 PM   #3
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OBDI and II can read baro if the airflow sensor has a baro sensor in it. It's used in airflow calculations, which are used to calculate fueling. My car has one, came with it from the factory. I wouldn't want to remove it or place it anywhere else.

Didn't COZX2 use Magnahelic differential pressure gauges to fine tune the aero on his car? I'd think it's a cheaper and effective solution for our needs.
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Old 08-09-2009, 05:53 PM   #4
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Quote:
Originally Posted by theholycow View Post
The price is pretty high. I thought OBDII can report barometric pressure.
Quote:
Originally Posted by DRW View Post
OBDI and II can read baro if the airflow sensor has a baro sensor in it.
I think you guys miss the point of the post, which was a unique way of of measuring phenomena associated with the aerodynamics of a vehicle. I know OBD can report back pressure, BUT NOT FROM THE HOOD! And yes the price is high, but I still thought it was an unusual method and others would find interesting.

I think I'll go so some other web sites now...
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Old 08-09-2009, 08:23 PM   #5
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I was contemplating using a bunch of water tubes...
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Old 08-10-2009, 03:55 AM   #6
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Quote:
Originally Posted by theCase View Post
I think you guys miss the point of the post, which was a unique way of of measuring phenomena associated with the aerodynamics of a vehicle. I know OBD can report back pressure, BUT NOT FROM THE HOOD! And yes the price is high, but I still thought it was an unusual method and others would find interesting.

I think I'll go so some other web sites now...
OIC. Yes, I did miss that. That's a whole different ballgame...interesting.
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Old 08-10-2009, 10:46 PM   #7
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I didn't miss the point, that's why I wrote: "Didn't COZX2 use Magnahelic differential pressure gauges to fine tune the aero on his car? I'd think it's a cheaper and effective solution for our needs."

Sorry I don't have time to search for you, but you'll find plenty of good aero info if you search for posts made by a member named 'COZX2' on this site. BTW the magnahelic differential pressure gauges are air pressure gauges.
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