by Turbosolara » Wed Feb 16, 2005 9:55 pm
Remeber, air expands when it is hot, and it contracts when it is cold. cold is always good.
i could also explain it in term of physic. ideal gas law..
PV=NRT.
P is the pressure, v is the volume, N is mole of the gas molecule , T = temperature. so you rearrange the formula and you get
P/NR = VT. so if the molecule size stay the same....the R is a constant number. the pressure is increased in a large amount, and the volume is compressed into same volume (so let's say V is the same). the n (molecule mass) would increase due to comression. you would see pressure has direct relationship with temperature.
here are more reasons that the air heat up because the turbo has two turbines, which one for exhaust and one for intake. Since they are in the same unit, the exhaust side would pass the heat over to the intake side. In turbocharged motor, the engine exhaust temperature are far higher then N/A because of entropy happen. not only that, another reason is that it has more crazy combusion happen in your cylinder chamber, the temperature sure is higher then N/A. Another addtional reason is that turbine are spinning over 10000 rpm to compress the air, the turbo it self would get pretty hot as well.
intercooler is always good for turbocharged motor. i think it is wrong to think that you only need IC when you are boosting high. I think people make a statement like that because it is true that the higher you boost, the more power difference you would see. but that is always your engine and turbo are producing heats.
for example, my exhuast temperature usually is about 700-750 degree when I am not boosting but cruising on at 80mph. When i boost, the temperature can go as high as 800-1000.
2002 Lexus IS300 5MT
1997 Prelude base, 5MT
But serious ... good information.
