John, I have no experience in that area. What is the highest pressure you
want to measure? A typical sensor used for a barometer is 15 PSIA. Most all
sensors are tested at an overpressure of at least twice their range.
Motorola makes a sensor, MAP (Manifold Absolute Pressure), for engine
control applications but it's also great for barometers and altimeters. The
device is the MPX4115A. It's normal range is around 2.2 to 16.7 PSIA with an
overpressure rating of 58 PISA. It provides internal signal conditioning and
runs off of +5V (5.1V nominal) with a full-scale span of around 4.6V. For
more info:

      http://mot-sps.com/products/sensors/

   - Tom

At 09:26 AM 2/12/00 -0800, John Pearson wrote:
>Tom,
>
>Thanks for the offer to help.
>
>I want to add some electric blowers to the induction system of my drag race
>car. I want to be able to ventilate the induction system to keep it cool
>before racing, then add some air pressure, hopefully, to increase air flow
>into the motor.
>
>I have a sketch on my web page: www.cmc.net/~xero. Sketch is called EEI.jpg
>(Electricaly Enhanced Induction). This illustrates my current system except
>I have added blowers where the induction system makes 90 degree turns into
>the engine compartment. You can see the car at www.fordmuscle.com. Click on
>the feature 'The Mouse'.
>
>I need to find a way to measure the minute amounts of pressure I hope to
>create at low speeds, untill the system intakes can take over and force air
>into the motor.
>
>I would like to recreate the effects of high barometric pressure, which
>really increase power. What kind of pressure are we talking about with
>barometric pressure.
>
>The Blowers are rated at cfm at certain static pressures. How does sp
>relate to barometric pressure. Are they close in values?
>
>Anyway, I am dealing with a lot of unknowns here as you can see.
>
>Hope you can help me out a little.
>
>Thanks
>John


------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)