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Message: <blockquote data-quote="blown98gt" data-source="post: 618846" data-attributes="member: 11284">i'm pretty sure that a V2 can be spun up to 60k + i do believe, and a 2.90 pulley at 6200 rpms is going to spin it to 52,000 impeller speed. all you have to do is find the max impeller speed for the blower and the formula to figuring out the blower speed is easy. These are what you need to figure it out. 1. Blower pulley size (i'm running a 2.90)2. Crank pulley size (stock is 6.75)3. Engine Rpms (how far you are going to push it, i use 6200-6500)4. Setup ratio (3.61 for a V2)then it's (6.75/2.90) x 3.61 x 6200 = 52,096 (which is the impeller speed)the break down is just (crank / blower pulley) x setup ratio x rpms</blockquote>