First Lager

What's the temperature of the beer?

Nope. The CO2 level you'll get at equilibrium depends entirely on temperature and pressure, as shown on any of the dozens (hundreds?) of charts out there.

Now, if you want your czech pils to be carbonated to a higher level (more volumes of CO2) than other beers you've carbonated at 10 psi and Temperature X, then yes, you'd need more pressure.

 

What will happen is that it will over carbonate, unless the temperature is pretty high, or unless you happen to turn it back down just at the right time

 

Time is another I'm use two 2 weeks at low gas to get decent carbonation. I also put the gas ON when the beer is cold as warm beer won't carbonate. Somewhere between 10-20

 

Beer will carbonate when it's warm. But it takes more pressure.

 

What matters is the actual beer temperature in the keg, which (given enough time in the fridge) will be the same as the fridge's average temperature. Let's say the beer is at 40F. At that temp, and with 10 PSI, the CO2 will settle at 2.3 volumes when it's finished carbonating, which is a reasonable level for a czech pils.

 

Turn it down to 35. It’ll carb much faster. I believe Bierstadt carbonates their lagers to 2.8. At 40* 15 PSI should get you there. Key is do you have the lines/faucet to handle it,

 

Buy a spunding valve