Quote:
Originally Posted by codyace
On the compressor side, yes the 56 trim A/R. However let it be known that A/R changes on the compressor side typically make for less to zero difference in HP, assuming th rest is the same. Will it change a few aspects? Yes technically, but it won't effect spool up and that sort. It's really interesting to read about how little an A/R change on a compressor effects power...very unlike the turbine sections which can make large differences.
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Cody, I am NOT CERTAIN, but I think you might be off a little here on your explanation.
From what I recall, the trim of the compressor wheel refers to the ratio of the area of the inducer to exducer.
On the 2871R, the exducer is 71 mm, so all that can change with different trims is the inducer size of the wheel.
But you were referring to "56 trim A/R"
I may be wrong, but I think A/R of the housing is completely different than the trim of the wheel.
And if you look on Garrett's website at the compressor map of the two different compressor wheel sizes:
The 56 trim does flow a little bit more than the 52 trim, but the difference is small.