Quote:
Originally Posted by chevota84
A lot of that is over my head, however, wouldn't the 1:1 ratio lead you to believe that the forces are close to balanced? If the turbine housing is too tight or the wheel is too small, you'll see a much higher drive pressure number vs boost, the same if there's an intake restriction. When it gets a higher than 1:1 ratio you're seeing an inefficiency on one side or the other of the turbo, it's taking way more power than its producing.
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Two scenarios I see:
1) VE of the engine is affected by the rise in back pressure. This causes the compressor
map to shift to the left for the same pressure ratio. Not good.
2) VE of the engine is NOT affected by the rise in back pressure. This means the compressor side is not affected, it is exactly as efficient as 1:1 which means the TURBINE side has lost efficiency. This can probably measured by the temperature difference pre and post turbo.
Again these are just thoughts, I have no empirical data.