Mazda 2009 RX-8, Service Highlights

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INTAKE-AIR SYSTEM [13B-MSP]
01-13–7
01-13
2009 Mazda RX-8 Serv i ce H i ghl i ghts (3452–1U–08C)
Rev i sed 11/2008 (Ref . No . R321/08)
SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM (S-DAIS) OPERATION [13B-MSP]
id0113z3661600
Operat i on Outl i ne
x
To i ncrease i ntake a i r amount and combust i on
eff i c i ency, the S-DAIS controls the s i ze of the
i ntake ports and the a i r length i n the i ntake p i pes
by open i ng or clos i ng the SSV, VDI valve, APV,
and VFAD valve (w i th VFAD) accord i ng to eng i ne
speed and load cond i t i on .
Operat i on
Low-speed range
x
At the low-speed range, the secondary and
aux i l i ary ports close, and a h i gh veloc i ty i ntake a i r
amount i s fed from only the pr i mary port . Due to
th i s, better combust i on eff i c i ency i s obta i ned by
the i mproved fuel atom i zat i on, produc i ng h i gh
torque output .
VFAD VALVE (WITH VFAD)
AIR CLEANER
ELEMENT
THROTTLE VALVE
VDI VALVE
VDI ACTUATOR
SSV
APV MOTOR
APV
EXHAUST MANIFOLD
AUXILIARY
PORT
SECONDARY
PORT
PRIMARY
PORT
SSV
SSV ACTUATOR
VFAD ACTUATOR
(WITH VFAD)
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PRIMARY
PORT
: INTAKE AIR
: EXHAUST GAS
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