How a JounceShock works-
When the suspension compresses it drives the shaft of the JounceShock into the JounceShock body. The shaft compresses the nitrogen volume and since the nitrogen is in a closed cylinder, the nitrogen pressure increases dramatically as it compresses. This gives a smooth exponential increase in force (like an air spring) instead of the force spike that occurs when typical suspension systems bottom out. The valving inside the JounceShock is designed such that after the JounceShock has compressed the suspension falls away faster than the JounceShock can extend. Therefore all of the energy that was put into compressing the JounceShock is dissipated by the valving rather than pushing the suspension back out. This is a key factor in why the JounceShocks are so effective for high energy absorption and vehicle control.