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Message: [QUOTE="windrunner408, post: 498868, member: 1868"] I wouldn't think that the volume of gases are equal at all (gas laws); but in general, hotter gases are going to contain more energy in them than the colder ones at a given volume and pressure (even though the mass of gas will be different between the two). Any time you do an energy balance calculation there is always some energy transferred due to temperature. It may be small in comparison to the volume/mass of gas flow but like I said, the difference in the amount of mass of gas (for the given volume) is also small and I believe it is a smaller contributing factor than the temperature and therefore you will gain more from a higher temperature gas at a relatively higher temperature than a lower temperature gas. Again this is all just a general rule of thumb. As far as what pressure is more efficient at spinning a turbo than any other pressure goes, it is my opinion that that has more to do with blade design and wheel trim than anything else. As pressure is really just a measure of the velocity of the gases hitting the turbine where the wheel trim is going to determine how efficient that turbine is at transferring that energy into rotating the wheel. [/QUOTE]

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