People always forget the R8 coupe is nearly 3,700 pounds and the GTR is 3,836 pounds 30 more than the NSX. No hybrid wizardry going on in either of those cars.
They Hybrid system in the NSX is tiny. The battery, which is the heaviest part of any hybrid or electric car, is a Lithium Ion battery with a mere 72 cells that is if my memory serves me right is 1.8 kWh. The entire Intelligent Power System which includes the lithium ion battery, junction board, high voltage distribution bus bar, 12-volt DC-DC converter, Electric motor ECU, Lithium-ion battery ECU, and the twin motor unit ECU is 35 percent smaller and 30% lighter than the RLX Sport-Hybrid system that came before it while also having 15% improved energy density.
For reference as to how small that batter really is, The LaFerrari battery is 2.3 kWh, the P1 battery has 324 cells and is 4.4kWh and weighs over 200 pounds, and the 918 Spyder battery is 6.8kWh.
We aren't talking about a couple hundred pound battery here, this system was designed to be as small and light as possible. As a matter of fact I think the one complaint is that Acura tried to stay too conservative (typical honda) with they hybrid system. I wish the battery was a bit more powerful and the electric motors were a bit beefier. I've said it many times before but the best power gains they will find for this car are hidden in the electrical system.
The place I am upset about the weight is with the exhaust, car would be under 3,800 pounds if that exhaust wasn't such a monster and the car would sound much better. I keep asking for a sport's exhaust option...