Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -r0a0417a975dc931b8eb05c1e4dc0599aab07492c -r90945afbe3866bf383c44c2a1f52438192c267c5
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 0a0417a975dc931b8eb05c1e4dc0599aab07492c)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 90945afbe3866bf383c44c2a1f52438192c267c5)
@@ -106,13 +106,14 @@
 #define BP_ML_PER_MIN_TO_PUMP_RPM_FACTOR    ( BP_REV_PER_LITER / ML_PER_LITER )     ///< Conversion factor from mL/min to motor RPM.
 #define BP_GEAR_RATIO                       32.0F           ///< Blood pump motor to blood pump gear ratio.
 #define BP_PWM_ZERO_OFFSET                  0.1F            ///< 10 pct PWM duty cycle = zero speed.
+#define BP_100_PCT_PWM_RPM_RANGE            4000.0F         ///< 10-90% PWM range yields 0-3,200 RPM range.  Full 100% PWM range would yield 4,000 RPM range.
 
 /// Conversion macro from mL/min to estimated PWM duty cycle %.
 #define BP_PWM_FROM_ML_PER_MIN(rate)        ( (rate) * BP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * BP_GEAR_RATIO * BP_MOTOR_RPM_TO_PWM_DC_FACTOR + BP_PWM_ZERO_OFFSET )
 /// Conversion from PWM duty cycle % to commanded pump motor speed.
-#define BP_PWM_TO_MOTOR_SPEED_RPM(pwm,dir)  ( ( ((pwm) - BP_PWM_ZERO_OFFSET) * 4000.0F ) * ( dir == MOTOR_DIR_FORWARD ? 1.0F : -1.0F ) )
+#define BP_PWM_TO_MOTOR_SPEED_RPM(pwm,dir)  ( ( ((pwm) - BP_PWM_ZERO_OFFSET) * BP_100_PCT_PWM_RPM_RANGE ) * ( dir == MOTOR_DIR_FORWARD ? 1.0F : -1.0F ) )
 /// Conversion from RPM to PWM duty cycle %.
-#define BP_MOTOR_SPEED_RPM_TO_PWM(rpm)      ( ( (F32)(rpm) / 4000.0F ) + BP_PWM_ZERO_OFFSET )
+#define BP_MOTOR_SPEED_RPM_TO_PWM(rpm)      ( ( (F32)(rpm) / BP_100_PCT_PWM_RPM_RANGE ) + BP_PWM_ZERO_OFFSET )
 /// Conversion macro from mL/min to estimated PWM duty cycle %.
 #define BP_ML_PER_MIN_FROM_PWM(pwm)         ( ( ( pwm - BP_PWM_ZERO_OFFSET ) / ( BP_ML_PER_MIN_TO_PUMP_RPM_FACTOR * BP_GEAR_RATIO * BP_MOTOR_RPM_TO_PWM_DC_FACTOR ) ) )