Combine sugar, oil, eggs, and vanilla in a large mixing bowl; beat about 1 minute at medium speed of electric mixer. Combine 1/2 cups flour, soda, salt, and cinnamon; gradually add to sugar mixture, beating at low speed of electric mixer until blended.
Dredge apples and pecans in remaining 1/2 cup flour; fold into batter. Spoon batter into a greased and floured 10 - inch tube pan. Bake at 325° for 1 hour and 30 minutes or until wooden pick inserted in center comes out clean. Cool in pan 15 minutes; remove from pan, and let cool completely. Spread frosting over top of cake.