Stock turbo/GReddy intercooler...
10-03-02, 11:44 AM
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Originally posted by Supermac 7
TBoost-
As you said, particles settle down and become more dormant when it is cool. When particles start jumping around more because of the heat, it becomes much hotter because of the friction against other particles. Whip out your chemistry book, you will find this to be true. The more air you are packing into a space, the more particles there are. They start moving around more because of the increased density, not the opposite. Try playing with an air compressor. when the compressor is compressing the air, is the air hot? As soon as you relieve it, it becomes cool, because it expands once it leaves the tank, cooling the molecules off.
TBoost-
As you said, particles settle down and become more dormant when it is cool. When particles start jumping around more because of the heat, it becomes much hotter because of the friction against other particles. Whip out your chemistry book, you will find this to be true. The more air you are packing into a space, the more particles there are. They start moving around more because of the increased density, not the opposite. Try playing with an air compressor. when the compressor is compressing the air, is the air hot? As soon as you relieve it, it becomes cool, because it expands once it leaves the tank, cooling the molecules off.
I am not saying that a turbo compressor doesn't expand particles thereby causing heat from intake air, because that is exactly what is happening. I'm saying that the denser your air is, the cooler the air. The less dense your air is, the hotter it is. You get more power on a cold night due to denser air molecules (which produces a greater volume of air). You get less power because of less dense or more expanded molecules. Imagine a cup of air whereby you can tightly pack more air molecules. The less excited they are, the less the number of escaped molecules and the more combustion in the chamber. The more excited, the more molecules escape and the less power.
In general,
More Dense = Less temperature
Less Dense = More temperature
Not so. The boost drops off because the compressor housing chokes it; To be honest, I really dont know if it's some sort of turbulence because of the lack of space, or what not; but I know if you clip the exhaust wheel, it allows for more flow, and the reduction of boost in the upper rpm ranges is dramatically reduced. This is not the case witha bigger turbo with an A/R ratio of, lets say .96. This exhaust housing provides for enough flow for just about any engine in the higher RPM range. I have absolutely no boost leaks anywhere, i can guarantee that.
The engine responds immediately; it's just the turbo takes time to spool, especially a bigger turbo.
Boost response: The time it takes for the turbo to reach maximum boost pressure after you initially hit the gas.
Turbo Lag: The amount of time it takes from when you first hit the gas till your engine responds. Turbo lag is decreased significantly the higher your rpms. For example, suppose you are cruising at 1500 rpms with your foot OFF the pedal. You nail the gas, and the turbo begins to spool while the engine slowly comes up to speed, you reach your maximum boost pressure at 4400rpm and the engine has finally caught up. You feel it in the acceleration response. Suppose again that in the same scenario you are at 5000rpm cruising with your foot OFF the gas. You nail it, you get a much faster response from the engine and the boost is almost instantly there. Because at that high of rpm, your fuel delivery is more than your boost pressure.
If you have the fuel, go for it. sure, you may get SOME hp out of it, but it's not worth having to replace your turbo all the time. Yes, fuel does have a cooling effect on the engine; as stated in an above post: If you have the fuel, crank it up. but not until then.
Jameson
-Tboost
With there 3" turbo back system they claim an approxiamate 32% increase. And most of that is because you can run higher boost.
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