How to get lots of extra horsepower for free on 456

Set the cable to the pedal right, then use two Ohm-meters measuring resistance of both throttle bodies to set the second cable. Resistance of both bodies should be identical over the entire range.
I found especially the moment of opening of both butterflies, at very low throttle, the most critical. They should open at exactly the same time.

 

Excellent! I have read the WSM for that section and your summary made it much clearer. Did you just use 2 multimeters connected to the potentiometer on each side? Then just work the pedal and adjust the cable as necessary?

 

Yes. (twice). I actually made a simple tool with some tube and rod end, supported to the seat, with which I could press the pedal mm by mm and see what happened with the throttle body resistances.

 

As I have only one multimeter I focused on the balance near the fully closed and fully open positions and it worked well. What required most focus was to get both throttle bodies to close exactly at the same time by adjusting the center cable.
Adjustments were all over the place when I got the car and the RHS throttle body would not even close properly as the center cable did not slide freely in its tube anymore... something that didn't seem to bother the last Ferrari dealership that serviced the car. Lol.