What is Boost? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 10-06-2007, 11:36 AM Thread Starter
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What is Boost?

I'm a new guy to the diesel world. My truck is a 1997 OBS 7.3 PSD. It is running great, it's in premo shape with out problems at this writing. But...........All of the time I read about "Boost".

What is boost? where is it created? what does it do? I am assuming (I know, don't assume) that it is pressure, right?

Beleave me, I have searched all over for this answer with neg results so.........I'm just going it ask.

WHAT IS IT?
Roger
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post #2 of 4 Old 10-06-2007, 11:37 AM
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Boost is the amount of air pressure created by the turbo for the air fuel mix

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post #3 of 4 Old 10-06-2007, 11:58 AM
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"Boost" is the internal pressure of the intake air above ambient (14.7psi or 1bar). If your boost gauge reads 20psi (for simplicity), there is 20psi of positive air pressure relative to outside...but there is 34.7psi actually in there...as per a perfect vacuum.

A turbo engine produces boost by the exhaust gasses passing across an impeller, causing it to spin. This then turns the compressor wheel, which sucks in air and pressurizes it. So...that 14.7psi of ambient pressure is now compounding causing more air for you to throw fuel at, making more power.


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post #4 of 4 Old 10-06-2007, 12:54 PM Thread Starter
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Quote:
Originally Posted by Ditty View Post
"Boost" is the internal pressure of the intake air above ambient (14.7psi or 1bar). If your boost gauge reads 20psi (for simplicity), there is 20psi of positive air pressure relative to outside...but there is 34.7psi actually in there...as per a perfect vacuum.

A turbo engine produces boost by the exhaust gasses passing across an impeller, causing it to spin. This then turns the compressor wheel, which sucks in air and pressurizes it. So...that 14.7psi of ambient pressure is now compounding causing more air for you to throw fuel at, making more power.
Thanks to both you and Dave G I totally understand what you have related.
Thank you both,
Roger:burnout
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