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</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (William @ Mar. 05 2002,6:19)</td></tr><tr><td id="QUOTE">okay, here's a third way. At 5 psi a T66 operates more efficiently than a T25, as a result the intake temps are cooler and more air is in the intake charge. Eh? This gets into how bigger turbos operate more efficiently.
"Smaller turbos tend to be less efficient than their bigger brothers because of the wheel-to-housing clearances. The bigger turbos have slightly larger clearances between the housing and wheels than their smaller brothers. This clearance causes internal leakage, which reduces efficiency of both the compressor and turbine. Since the clearances and leakage are proprtionally larger on the smaller turbos, they are less efficient..."
Read it three times, then it will make more sense. This isn't the ONLY reason bigger turbos are more efficient, just one.</td></tr></table><span id='postcolor'>
Not doubting your knowledge on turbos about I dont think that's the main reason that bigger turbo produces more power at the same psi as in smaller turbos.
CrazyC, I know where you're coming from and I think the problem in this argument is in WHERE the pressure is measure at. I think when turbos are rated at a certain pressure, it's measuered in the housing itself. Bigger turbo has bigger space = more air at less pressure than smaller turbos. This makes sense to me since rating a turbo using a standard intake manifold would not be accurate since there are different size manifolds. So in conclusion, same psi in bigger and smaller turbos would relates to different PSI at the same (your) manifold; which is more air => more power.
there's no way with same psi of air in the intake manifold, even bigger turbo, would translate into more power.
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K. Lu
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