2009 Mazda RX-8 Service Highlights (3452–1U–08C)
01-13 INTAKE-AIR SYSTEM [13B-MSP]
INTAKE-AIR SYSTEM
STRUCTURAL VIEW [13B-MSP] . . . 01-13–2 INTAKE-AIR SYSTEM DIAGRAM
[13B-MSP] . . . 01-13–3 INTAKE-AIR SYSTEM VACUUM
HOSE ROUTING DIAGRAM
[13B-MSP] . . . 01-13–4 FRESH-AIR DUCT FUNCTION
[13B-MSP] . . . 01-13–5 FRESH-AIR DUCT
CONSTRUCTION [13B-MSP] . . . 01-13–5 INTAKE MANIFOLD
CONSTRUCTION [13B-MSP] . . . 01-13–5 SEQUENTIAL DYNAMIC AIR
INTAKE SYSTEM (S-DAIS)
STRUCTURE [13B-MSP] . . . 01-13–6 SEQUENTIAL DYNAMIC AIR
INTAKE SYSTEM (S-DAIS)
OPERATION [13B-MSP] . . . 01-13–7 Operation Outline. . . 01-13–7 Operation. . . 01-13–7
SECONDARY SHUTTER VALVE (SSV) SOLENOID VALVE CONSTRUCTION/OPERATION
[13B-MSP] . . . 01-13–9 VARIABLE FRESH AIR DUCT
(VFAD) SOLENOID VALVE
FUNCTION [13B-MSP]. . . 01-13–10 VARIABLE FRESH AIR DUCT
(VFAD) SOLENOID VALVE CONSTRUCTION/OPERATION
[13B-MSP] . . . 01-13–10 VARIABLE FRESH AIR DUCT
(VFAD) ACTUATOR FUNCTION
[13B-MSP] . . . 01-13–10 VARIABLE FRESH AIR DUCT
(VFAD) ACTUATOR
CONSTRUCTION/OPERATION
[13B-MSP] . . . 01-13–10 AUXILIARY PORT VALVE (APV)
MOTOR FUNCTION [13B-MSP]. . . 01-13–10 AUXILIARY PORT VALVE (APV)
MOTOR
CONSTRUCTION/OPERATION
[13B-MSP] . . . 01-13–10 End of Toc
NG: INTAKE-AIR SYSTEM
INTAKE-AIR SYSTEM [13B-MSP]
01-13–2
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) INTAKE-AIR SYSTEM STRUCTURAL VIEW [13B-MSP]
id0113z3100200
End Of Sie
VFAD SOLENOID VALVE (WITH VFAD)
APV MOTOR INTAKE MANIFOLD
SSV ACTUATOR VDI ACTUATOR
SSV SOLENOID VALVE VDI SOLENOID VALVE CHECK VALVE
ACCELERATOR PEDAL
THROTTLE BODY
AIR CLEANER VFAD ACTUATOR (WITH VFAD)
CHECK VALVE
ar8uun00000089
INTAKE-AIR SYSTEM [13B-MSP]
01-13–3
01-13 2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08)
INTAKE-AIR SYSTEM DIAGRAM [13B-MSP]
id0113z3102200
End Of Sie
VFAD CHECK
VALVE
SSV A
A
B B
C
C
AIR CLEANER CATCH TANK
SSV SOLENOID VALVE
AIR SOLENOID VALVE
VDI SOLENOID VALVE (13B-MSP (HIGH-POWER))
VACUUM CHAMBER
VDI ACTUATOR TO REAR
PRIMARY/SECONDARY PORTS
VDI VALVE SSV ACTUATOR
PRIMARY PORT
JET AIR FUEL MIXING NOZZLE
TO PCM SECONDARY PORT AUXILIARY PORT
VFAD ACTUATOR
APV MOTOR
CHECK VALVE VFAD
SOLENOID VALVE
VACUUM CHAMBER THROTTLE BODY
WITH VFAD
WITH VFAD
ar8uun00000091
INTAKE-AIR SYSTEM [13B-MSP]
01-13–4
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [13B-MSP]
id0113z3100400
End Of Sie
SOKYU_NG: FRESH-AIR DUCT
→
AIR SOLENOID VALVE
INTAKE MANIFOLD VDI ACTUATOR
SSV ACTUATOR
AIR PUMP
AIR CONTROL VALVE
EXHAUST MANIFOLD
VFAD ACTUATOR (WITH VFAD)
VACUUM CHAMBER VFAD SOLENOID VALVE
(WITH VFAD)
ONE-WAY CHECK VALVE SSV SOLENOID
VALVE
VDI SOLENOID VALVE
ONE-WAY CHECK VALVE PURGE SOLENOID
VALVE
EXTENSION MANIFOLD (UPPER)
VACUUM CHAMBER
ar8uuw00001427
INTAKE-AIR SYSTEM [13B-MSP]
01-13–5
01-13 2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) FRESH-AIR DUCT FUNCTION [13B-MSP]
id0113z3141600
x Channels air to the air cleaner.
x The VFAD valve has been adopted, improving torque and output at the medium-high speed range. (with VFAD) End Of Sie
FRESH-AIR DUCT CONSTRUCTION [13B-MSP]
id0113z3662100
x Composed of the fresh-air duct, VFAD actuator (with VFAD), and VFAD valve (with VFAD).
End Of Sie
NG: INTAKE MANIFOLD
INTAKE MANIFOLD CONSTRUCTION [13B-MSP]
id0113z3100800
Construction
x Composed of the SSV, VDI valve, APV, APV motor, jet air fuel mixing nozzles, and body.
End Of Sie
SOKYU_NG: SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM
FRESH-AIR DUCT
VFAD VALVE
VFAD ACTUATOR ILLUSTRATION SHOWS WITH VFAD
ar8uun00000111
VDI VALVE
SSV
APV MOTOR
APV
APV
JET AIR FUEL MIXING NOZZLE
ar8uun00000090
INTAKE-AIR SYSTEM [13B-MSP]
01-13–6
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM (S-DAIS) STRUCTURE [13B-MSP]
id0113z3661500
x The S-DAIS is composed of the SSV, VDI valve, and VFAD valve (with VFAD) which are opened and closed by intake manifold vacuum or BARO, and the APV which is opened and closed by motor drive.
End Of Sie
SSV ACTUATOR
SSV VDI VALVE
VDI ACTUATOR
APV MOTOR
INTAKE MANIFOLD
APV
APV
EXTENSION MANIFOLD (UPPER)
SSV SOLENOID VALVE
VDI SOLENOID VALVE
VACUUM CHAMBER CHECK VALVE
VFAD SOLENOID VALVE (WITH VFAD)
CHECK VALVE
VACUUM CHAMBER VFAD VALVE (WITH VFAD)
VFAD ACTUATOR (WITH VFAD)
ar8uun00000092
INTAKE-AIR SYSTEM [13B-MSP]
01-13–7
01-13 2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08)
SEQUENTIAL DYNAMIC AIR INTAKE SYSTEM (S-DAIS) OPERATION [13B-MSP]
id0113z3661600
Operation Outline
x 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, and VFAD valve (with VFAD) according to engine speed and load condition.
Operation
Low-speed range
x 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.
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)
ar8uun00000105
PRIMARY PORT
: INTAKE AIR : EXHAUST GAS
ar8uun00000106
INTAKE-AIR SYSTEM [13B-MSP]
01-13–8
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) Medium-speed range
x When the engine speed reaches the medium range, the SSV opens and intake air from the secondary port begins. Due to this, the intake air amount increases, improving torque at the engine medium-speed range.
Medium-to-high-speed range
x When the engine speed reaches the medium-tohigh range, the VFAD (with VFAD) and APV open.
x When the VFAD valve (with VFAD) opens, intake air resistance is reduced by the shortening of air length in the fresh-air duct pipe.
x When the APV opens, air from all intake ports is fed, improving torque at the medium-to-high-speed range.
SSV SSV
SSV ACTUATOR
: INTAKE AIR : EXHAUST GAS
ar8uun00000107
VFAD ACTUATOR (WITH VFAD)
VFAD VALVE (WITH VFAD)
AUXILIARY PORT APV
APV MOTOR APV
: INTAKE AIR : EXHAUST GAS
ar8uun00000108
INTAKE-AIR SYSTEM [13B-MSP]
01-13–9
01-13 2009 Mazda RX-8 Service Highlights (3452–1U–08C)
High-speed range
x When the engine speed reaches the high range, the VDI valve opens, and the actual length of the intake air in the pipe is shortened to efficiently provide dynamic air charging effect.
x When the intake ports are shut abruptly, the intake air does not stop due to the inertia effect and it becomes compressed and highly
pressurized. This pressurized air becomes a reflected high-pressure wave that pressurizes the intake air in the rotor chambers. This is dynamic air charging pressurization. The intake air amount is increased by the dynamic air charging effect, improving torque at the high-speed range.
End Of Sie
SOKYU_NG: SOLENOID VALVE
SECONDARY SHUTTER VALVE (SSV) SOLENOID VALVE CONSTRUCTION/OPERATION [13B-MSP]
id0113z3662400
x Composed of a solenoid coil, spring, plunger, and filter.
Energized
x When the solenoid coil is energized, the plunger is pulled back. Pulling the plunger back opens the passage between ports A and B. Due to this, intake manifold vacuum is applied to the actuator.
De-energized
x Passage of port A is closed by the reaction force of the spring, and the passage between ports B and C is opened. Due to this, BARO is applied to the actuator.
End Of Sie
SOKYU_NG: VARIABLE FRESH AIR DUCT SOLENOID VALVE
VDI ACTUATOR
VDI VALVE
: INTAKE AIR : EXHAUST GAS
ar8uun00000109
HIGH-PRESSURE WAVE
VDI VALVE
ar8uun00000110
A B
C
ar8uun00000093
INTAKE-AIR SYSTEM [13B-MSP]
01-13–10
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
Revised 11/2008 (Ref. No. R321/08) VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE FUNCTION [13B-MSP]
id0113z3662500
With VFAD
x Switches pressure (intake manifold vacuum or BARO) applied to the VFAD actuator according to a signal from the PCM.
End Of Sie
VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE CONSTRUCTION/OPERATION [13B-MSP]
id0113z3662600
With VFAD
x Composed of a solenoid coil, spring, plunger, and filter.
Energized
x When the solenoid coil is energized, the plunger is pulled back. Pulling the plunger back opens the passage between ports A and B. Due to this, BARO is applied to the actuator.
De-energized
x Passage of port A is closed by the reaction force of the spring, and the passage between ports B and C is opened. Due to this, intake manifold vacuum is applied to the actuator.
End Of Sie
SOKYU_NG: VARIABLE FRESH AIR DUCT ACTUATOR
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR FUNCTION [13B-MSP]
id0113z3663300
With VFAD
x Opens and closes the VFAD valve.
End Of Sie
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR CONSTRUCTION/OPERATION [13B-MSP]
id0113z3663400
With VFAD
x A diaphragm design has been adopted.
x Normally, the rod is pushed by the force of the spring, opening the VFAD valve. When intake manifold vacuum is applied to the diaphragm chamber, the rod is pulled, closing the VFAD valve.
End Of Sie
SOKYU_NG: AUXILIARY PORT VALVE MOTOR
AUXILIARY PORT VALVE (APV) MOTOR FUNCTION [13B-MSP]
id0113z3663100
x Drives the APV motor to open or close the APV according to a signal from the PCM.
End Of Sie
AUXILIARY PORT VALVE (APV) MOTOR CONSTRUCTION/OPERATION [13B-MSP]
id0113z3663200
x The position sensor is built into the APV motor.
x The motor is driven according to an operation signal from the PCM.
x The motor driving force is transmitted to the drive gear, counter gear, shaft, and arm, thereby opening or closing the APV.
End Of Sie