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My custom made 2 inch drive pulley for the blower. Brunette Engineering in Newcastle fitted a 2 inch drive pulley from my old 40 amp alternator to the spline of the toyota pulley.
This gives me a drive ratio of 3:1, so at 5000 rpm the blower will spin 15,000rpm.
The aim wasnt to achieve big boost, just to bring the boost on early. My setup will make very good boost from around 1800 rpm.