ScienceofSpeed adds Liquid Injection to Second Gen NSX: As with any turbocharged engine, the performance from the 3.5L twin-turbocharged Second Generation NSX degrades after repeated acceleration cycles. With multiple acceleration runs on our Superflow chassis dyno it's normal to see the intake temperature sensor in the intake manifold increase by 40-50 degrees over ambient temperature.
As the intercoolers and manifold heat up from charge temperature and radiant heat from the engine - we've observed engine performance decrease by 30-40 horsepower after six to eight back-to-back acceleration runs on NSX engines at factory boost levels. Increase boost pressure and increased charge temperatures result in 40-50 horsepower loss in only three acceleration runs.