Z Z06gette Member Authorized Seller Dec 3, 2018 #1 Joined Apr 29, 2018 Messages 68 Likes 2 Dec 3, 2018 #1 Ok ive got a Holset H1c 18cm hotside. Question is do we need a restrictor on the oil feed? Holset says that it needs 10psi oil pressure at idle, and the 7m typically is around 7psi at idle. What have some people run with success??