My turbo calculation spreadsheet

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Hey guys. This is what I have been using to calculate turbo sizing. It's a spreadsheet that I wrote. It includes graphs of the peak efficiency of the turbos, charts of the turbos versus the flowrate demands of the engine, and a page with compressor and turbine wheel specs. The ones you might like are the charts of a GT35R, GT4088R, and T04R/T04Z compressor efficiency versus 3.4 DOHC engine need at a variety of pressure ratios. I'm open to any feedback you may have. If you spot any errors, please let me know. Thanks.

Tim