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Message: [QUOTE="Zeb, post: 1529351, member: 30304"] What everyone calls a 62 actually measures 61.47mm, so the sizes are pretty evenly spaced. (61.47mm, 62.99mm, 64.4?mm) Turbine size will make the biggest difference on spool up. It takes 2 things to drive a turbo, heat and pressure. Ask yourself how much of the time you will spend at an rpm level that can cause back pressure to be high. The time you spend there will be minimal compared to the time you spend at lower rpm when daily driving and towing where spoolip will be WAY more important. Most guys spend way too much time worrying about whether drive pressure will be 1/1. If you hit 1.5/1, or even a little more, at the top of a shift, or pulling a hill for a bit, IT’S NOT GOING TO HURT ANYTHING as long as egt, etc is within the safe zone. [/QUOTE]

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