Is a desk top dyno worth using / In most of the testing I have seen the desk top over estamates the power so bad it is not even worth looking at . when I built my car i was shooting for high 11.second passes my calculations were that I needed 385 hp . the desk top told me i should have 460 hp . On a real dyno My engine pulled 398 hp. I cut back my shift points and run right on 12 seconds .