Suzuki used a variable suction system on the 1.6-liter displacement engine of the new “Swimming Sports Car” released in November 2011, which can switch the intake passage of the spiral intake manifold in two stages. The system is said to be manufactured by MAHLE Filter Systems, which is engaged in the high-closed switching valve business.

The variable suction system is used to increase the torque in the engine rotation area. Generally, in the case of using a two-stage switching type system, the valve switching is to make the suction passage in the low rotation speed area longer and the passage in the high rotation speed area shorter, but this time it uses the short passage in the low rotation speed range, in 3000 A long channel is used in the medium speed zone of -5000 rpm and a short channel is used in the high speed zone. According to reports, in the low-revving area, due to the small amount of air, it is necessary to shorten the suction path as much as possible to reduce the resistance and improve the fuel efficiency.

Moreover, reducing the knock in low-speed areas can also effectively improve the fuel efficiency, so this system expands the water path of the cylinder head, making the cylinder head easier to cool. When knocking is detected, the thermal efficiency can be reduced by delaying the ignition time, thereby reducing the occurrence of knocking problems. The maximum output power was increased from 92 kW of the original engine to 100 kW, which was mainly due to the increase in valve lift. The suction end increased from 8.1 mm to 8.8 mm, and the exhaust end increased from 7.5 mm to 7.8 mm. This increase in friction due to the spring constant of the valve spring increases, but the emphasis on output power has changed.

In addition, in order to reduce the pressure loss of the exhaust pipe, the catalyst below the floor is also removed, only the direct type catalyst is used, and not only this, but also the capacity of the auxiliary combustion chamber is increased. However, the diameter of the exhaust pipe was not changed. In addition, the shape of the suction manifold is also made smoother. The original nozzle installation site is concave and convex. This time, the nozzle has been changed to a longer one, and the unevenness of the installation site has been reduced. At the same time, the roughness of the air intake port surface has also been improved, thereby reducing the resistance.