Flat vs un-carbonated question.

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Fordiesel69

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When sampling a good dark home brew out of the fermenter, it is very drinkable in its un-carbonated state. When you then carbonate the kegs, pour your beer and let it go flat, it is out right flat and disgusting. I am failing to understand why this is the case. What has happened to make it taste so terrible?
 
The beer from the fermenter is likely very green and has a lot of flavors that age out by the time it has been kegged carbonated. Also, carbonating the beer affects the flavor and may leave something behind that looses balance when it goes flat.
 
Freshly fermented beer has roughly between 0.8 and 1.1 volumes of CO2 dissolved in it, and you carbonate it upward from there to about 2.3 to 2.5 volumes of CO2. Flat is zero volumes of CO2. Way different.
 

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