Mazda RX-8 2004 - System (S-Dais) Operation; System (S-Dais) Structure; Sequential Dynamic Air-Intake System (S-Dais) Operation; Operation Outline

INTAKE-AIR SYSTEM
01–13–9
01–13
SEQUENTIAL DYNAMIC AIR-INTAKE SYSTEM (S-DAIS) OPERATION
CHU011300113S07
Operation Outline
• To increase intake air amount and combustion
efficiency, the S-DAIS controls the size of the
intake ports and the air length in the intake pipes
by opening or closing the SSV, VDI valve, APV
(13B-MSP (High Power)), and VFAD valve (13B-
MSP (High Power)) according to engine speed
and load condition.
Operation
Low-speed range
• At the low-speed range, the secondary and
auxiliary ports close, and a high velocity intake air
amount is fed from only the primary port. Due to
this, better combustion efficiency is obtained by
the improved fuel atomization, producing high
torque output.
SSV
VFAD VALVE (13B-MSP (HIGH POWER))
VDI VALVE
AIR CLEANER
ELEMENT
EXHAUST MANIFOLD
PRIMARY
PORT
SECONDARY
PORT
AUXILIARY PORT
(13B-MSP
(HIGH POWER))
VDI ACTUATOR
SSV ACTUATOR
VFAD
ACTUATOR
THROTTLE VALV
APV MOTOR
(13B-MSP
(HIGH POWER))
APV
(13B-MSP
(HIGH POWER))
(ILLUSTRATION SHOWS 13B-MSP (HIGH POWER))
CHU0113S011
: INTAKE AIR
: EXHAUST AIR
PRIMARY PORT
(ILLUSTRATION SHOWS 13B-MSP (HIGH POWER))
CHU0113S012