Preheat your oven to 325°F (165°C).
In a large mixing bowl, sift together the cake flour, sugar, baking powder, and salt.
In a separate bowl, whisk together the egg yolks, vegetable oil, lemon juice, lemon zest, and vanilla extract until well combined.
Gradually add the wet ingredients to the dry ingredients, mixing until smooth.
In another clean bowl, beat the egg whites and cream of tartar until stiff peaks form.
Gently fold the beaten egg whites into the batter until just combined, being careful not to deflate the mixture.
Pour the batter into an ungreased tube pan and smooth the top.
Bake for 55-60 minutes or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and invert the pan onto a cooling rack. Let it cool completely before removing from the pan.
Serve your lemon chiffon cake with a dusting of powdered sugar or a dollop of whipped cream.
Enjoy!