Adjust oven rack to the lowest position. Preheat oven to 350°F/175°C.
In a large glass or metal bowl, beat the cake ingredients with an electric mixer on low speed for 30 seconds. Then beat on medium speed for 1 minute. Pour the batter into an ungreased 10-inch tube cake pan.
Bake for 37-47 minutes, until the crust is dark golden brown and the cracks are dry. Immediately flip the pan upside down on a cooling rack for about 2 hours or until the cake is completely cool. Loosen the cake from the side of the pan with a knife or long spatula. Slice the cake onto a serving plate.
Whisk the powdered sugar and ginger together. In a large chilled bowl, beat whipping cream and powdered sugar with an electric mixer at high speed until soft peaks form.
Serve the pumpkin angel food cake topped with ginger whipped cream. Sprinkle with additional pumpkin pie spice, if desired.