About PMI
The definition of (Polar Moment of Inertia) PMI is the resistance of an object, in this case the NSX, to rotational acceleration. A front engine, rear wheel drive car (ie. a Camaro) would have high PMI compare to the mid-engined NSX which has a low PMI which means the majority of its mass is within its wheelbase, contributing to a low PMI which in turn, improves cornering turn-in.
A low PMI will results with more nimble handling, but it also produces a more rough ride. Your damper settings may need to be changed to achieve a good balance between ride and handling.
Without going into detail calculation, you can do a rough experiment by holding a full carton of eggs(pretend its a car) by its long axis and rotate it back and forth and feel the resistance. Then remove two eggs from one end(make it the frt or the rear of a car) and rotate it to feel the difference. Then remove two more eggs from the other end of the carton and rotate it to feel the difference. The eggs you removed represent the heavy OEM bumpers and as you will see, it surely change the characteristic of the handling of the carton.
*We also have a front prepreg bumper to balance the weight distribution of the car. PLEASE be cautious after you install the bumpers because the handling will be quicker as ~40 lbs total was removed from the far ends of the car and that is a lot.
Do not be confused PMI with Moment of Inertia(MOI), its two different topics and we will cover that when we have the Brake Kit (BK).
The definition of (Polar Moment of Inertia) PMI is the resistance of an object, in this case the NSX, to rotational acceleration. A front engine, rear wheel drive car (ie. a Camaro) would have high PMI compare to the mid-engined NSX which has a low PMI which means the majority of its mass is within its wheelbase, contributing to a low PMI which in turn, improves cornering turn-in.
A low PMI will results with more nimble handling, but it also produces a more rough ride. Your damper settings may need to be changed to achieve a good balance between ride and handling.
Without going into detail calculation, you can do a rough experiment by holding a full carton of eggs(pretend its a car) by its long axis and rotate it back and forth and feel the resistance. Then remove two eggs from one end(make it the frt or the rear of a car) and rotate it to feel the difference. Then remove two more eggs from the other end of the carton and rotate it to feel the difference. The eggs you removed represent the heavy OEM bumpers and as you will see, it surely change the characteristic of the handling of the carton.
*We also have a front prepreg bumper to balance the weight distribution of the car. PLEASE be cautious after you install the bumpers because the handling will be quicker as ~40 lbs total was removed from the far ends of the car and that is a lot.
Do not be confused PMI with Moment of Inertia(MOI), its two different topics and we will cover that when we have the Brake Kit (BK).