Usually one puts a hotter plug in when the car starts getting fouling issues from oil getting in the cylinder. Other than that, there is no reason to do it.
I was taught by a engineer at Ford who has done combustion testing. Run the hottest plug without having pre-ignition, this gives ultimate combustion efficiency while maintaining maximum power through out the fuel curve.
I was taught by a engineer at Ford who has done combustion testing. Run the hottest plug without having pre-ignition, this gives ultimate combustion efficiency while maintaining maximum power through out the fuel curve.