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Old 03-17-2009, 12:21 PM   #1
the misanthropist
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Join Date: May 2002
Location: a house
Posts: 6,248
Help me make heads and tails of turbo selection/compressor maps

I'm trying to learn about turbo setups and pick components. My goal is 400-450 flywheel HP out of the S52. I don't want to rebuild the whole engine, just MLS gasket and ARP studs, so I'm hoping to get into my ballpark at a reasonably safe 9-10psi.

I've been reading Garrett's site and most things make sense except for the part about picking turbos. I tried to estimate things using their equations but I could be totally out to lunch on the figures. It seems like the ideal turbos for what I want is either the GT2876R or even the GT3582R. My estimated ratio and flow seem to fall into the ideal range for those. But I don't get how the surge lines work. I mean I understand the max. But how do I know if at lower RPM my engine won't put it in the choke area...

If someone has experience doing exactly what I'm talking about, any constructive comments or suggestions welcome.
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