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Variable
Resonance Induction System (VRIS)
Three solenoid operated
shutter valves are installed in the dynamic chamber of the Variable Resonance
Induction System (VRIS). The VRIS opens and closes the shutter valves
according to the engine speed and throttle opening angle to improve the
charging efficiency by utilizing the pressure waves of the intake air.
The Powertrain Control Module (PCM) applies voltage to the VRIS solenoids
1 and 2, and the solenoids apply vacuum to the shutter valve actuators
which move the shutter valves. There are two vacuum chambers located under
the front (LH) bank of the intake manifold. These vacuum chambers maintain
a constant vacuum to the VRIS shutter valves during wide open throttle
operation and other low-vacuum, low-speed situations.
Variable
Resonance Induction System (VRIS)
Item |
Description |
1 |
Shutter
Valve (No.1) |
2 |
Shutter
Valve (No.2) |
3 |
Shutter
Valve (No.1) |
4 |
Throttle
Valve |
5 |
Shutter
Valve (No.2) |
6 |
Shutter
Valve Actuator (No.1) |
7 |
Shutter
Valve Actuator (No.2) |
8 |
Vacuum
Chambers |
Variable
Resonance Induction System (VRIS) Shutter Valve Operation
Engine
Speed (rpm) |
0-3,250 |
3,250-4,250 |
4,250-6,250 |
6,250-7,500 |
Shutter
valve No. 1 |
Closed |
Open |
Open |
Closed |
Shutter
valve No. 2 |
Closed |
Closed |
Open |
Closed |
NB: Any adjustments
or modifications carried out on your motor vehicle are done so at your
own risk and neither the owner of this website nor anyone associated with
it accepts any responsibility or shall be held liable for any possible
damage resulting either directly or indirectly from such modifications
and/or adjustments.
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