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A local member has a dedicated track Z. It has no accusump, and is running a SpecialtyZ oil pan. He has a Defi oil pressure gauge and his oil pressure, from what I've seen, always holds strong, even at long WOT pulls up to 140mph. I've also heard that the IMSA Z32 used an auxiliary pump that activated at high RPMs to help move oil from the heads back into the pan, while retaining a wet sump setup--though certainly with a different oil pan as well.
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