Response to Hello Timothy.  Performance Curves are specific to the manufacturer/model of the pump and not the motor.  The WF-26 is a 1.5 HP Up Rate Model with a total horsepower (THP) of 1.65 manufactured with the Impeller, 1 Hp Full 1 1/2 Hp Up. (073128)  It is the combination of the 1.65 THP motor and the Impeller that produces data that appears on the pump curve.  The Century 1.5 HP Square Flange 56Y Up Rate Motor - B2854 with the same impeller reads as a 1.5HP pump on the Performance Curve.  Whisperflo Pump 1 1/2 HP - WF-26  At 72 ft of Head, roughly 90 GPM.  

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