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arkansasfiddler
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Discussion Starter · #1 ·
quick ques., if a gn has 20 psi boost @ 50 degrees air temp (winter),... @ 90 degrees air temp. will the boost still be the same with no changes mechanically? in other words in summer will boost drop because of hot humid air? when i got my car in december i would see 20#. have since added a power plate and alky, and now see about 18#. have adjusted wastegate about 3 rounds and am seeing about 19#, but here in arkansas (now) it is 90 deg,. and very humid.
 

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Resident Idiot
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11,462 Posts
I've noticed the same thing. Denser air and less underhood heat in the winter.
 

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Premium Member
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43,735 Posts
very possible...air is less dense now :)
 

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Don't Tread On Me
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3,130 Posts
The density of air at 50 F and 20% relative humidity at sea level is 0.0780 lbs/cubic foot.

The density of air at 90 F and 50% relative humidity at sea level is 0.0717 lbs/cubic foot.

Roughly an 8.1% change.

This would correlate with your observed changes in boost.
 

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2,098 Posts
Also, when the air temp is high, the IC doesn't work as well. You get hotter, less dense air into the engine, and less exhaust gas out to drive the turbo.
 
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