Is there a general rule or calculation on how much extra HP u can gain from a certain lower air-intake temperature(like -x degrees=+X%HP), or is there a way to make a rough estimate?
by 
wouterspruijt
ANSWERS: 1
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You could use the Ideal Gas Law: pV = nRT where p is the absolute pressure [Pa], V is the volume [m3] of the vessel containing n, moles of gas, n is the amount of substance of gas [mol], R is the gas constant [8.314 472 m3·Pa·K−1·mol−1], T is the temperature in kelvins [K]. Or, you could just use this calculator - http://wahiduddin.net/calc/calc_hp_dp.htm . I recommend the calculator ;)
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