Preheat the oven to 325°F (165°C). Line the bottom of a 9-by-3-inch round cake pan with parchment paper cut to fit.
In a food processor, process the pecans, flour, and salt until finely ground. Do not overprocess.
Using a stand mixer, beat the egg yolks and 1/3 cup of the granulated sugar with the whisk on medium-high speed until pale and thick, 3 to 5 minutes. Using a large rubber spatula, fold in the pecan mixture. Transfer to a large bowl.
Thoroughly wash and dry the mixer bowl and whisk. Beat the egg whites with the whisk on medium speed until they start to foam.
Add 1/3 of the remaining granulated sugar and beat until the whites are opaque, then add another third of the sugar. When the whites start to increase in volume and become firm, add the remaining sugar and increase the speed to high. Beat until the whites form soft peaks but still look wet. Using the spatula, carefully fold 1/3 of the whites into the pecan mixture and then fold in the remaining whites.
Pour the batter into the prepared pan and smooth the top. Bake until lightly browned and a skewer inserted into the center comes out clean, 35 to 40 minutes. Let the cake cool completely on a wire rack.
Run a table knife around the edge of the pan and invert the pecan torte onto a cake stand or serving plate. Peel off the parchment paper. Carefully place the cake right side up on the stand or plate.