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Message: <blockquote data-quote="R-III-R Turbo" data-source="post: 703970" data-attributes="member: 3591">I had this problem too. Not because I wanted the charger to turn max rpm at the same time as the engine was max 9000rpm, but because I decided that I wanted to max out at 8-9psi.The charger pulley was already max diameter to fit the belt cover, so I use a smaller crank pulley. Had it custom made from my CAD drawing. Ended up with 9psi, so my calculations for pulley diameter vs the charger map were not bad.</blockquote>