TexRacer hit it spot on. The red/green spring combo is usually always a decent place to start with any stock motor. Genrall for sedan you'll go stiffer, but it's still a gfreat starting point. Lately I've been running trinity 4499 brushes with a verticle slot in them. And green springs all around. Worked alot better for me than a full brush and red/green.
-Korey