Suzuki DF200/DF225/DF250 V6 Engine Control System - Multi-Stage Induction
The multi-stage induction system is designed to improve the intake efficiency by changing the intake tract volume in accordance with the engine speed. This system improves low and mid-range torque and increases power output at the higher rpm ranges.
SYSTEM COMPOSITION
Located between the STBD and PORT banks, a collector assembly provides air for the low/mid-range intake tract and high-speed range tracts. Mounted on the collector are two throttle bodies, VSV, vacuum tank, depression chamber for operating the system, and the shut-off valve for switching the intake tract. System connection components include one check valve and hose to form the vacuum passage.
VACUUM TANK
The vacuum tank stores vacuum created during engine operation. The vacuum tank's purpose is to supply a stable vacuum to the depression chamber under the varying vacuum conditions normally occurring within the collector, thereby making it possible to control the shut-off valve accurately. A hose and check valve connect one side of the vacuum tank to the collector. The other side of the tank is connected to the VSV with a hose. One side of the VSV is connected via hose to the vacuum tank, the other side is connected via hose to the depression chamber. The VSV receives operating signals from the ECM. When the ECM signals OFF, the VSV releases vacuum to the atmosphere. When the ECM signals ON, the VSV supplies vacuum to the depression chamber.
