Universal Diesel Blow-Off Valve HKS SQV4 Style (TK-DBSQV4) - Optimal Performance with Intelligent Control
This HKS SQV4 style diesel blow-off valve is perfect for turbocharged diesel engines, where reducing turbo pressure backflow is essential. The kit includes all necessary components for easy installation:
- Diesel blow-off valve control module
- Solenoid for blow-off valve control
- 25mm blow-off valve
- Aluminum adapter for intercooler hose attachment
- Wiring harness between control module and solenoid
- 3mm yellow vacuum silicone hose (1m)
The solenoid requires connection to the vacuum pump and intake manifold pressure. The control module monitors the 5V signal from the electronic accelerator pedal. If the blow-off valve has a strong pre-tension spring or the engine’s vacuum pump is weak, an additional vacuum reservoir might be needed, which is available in our webshop. Should the solenoid operate without the valve opening, this could indicate insufficient vacuum strength.
The intelligent control unit monitors pedal position, activating the solenoid based on throttle release. For greater throttle inputs, it operates the solenoid for longer, ensuring smooth performance and faster response.
Important:
The product must be installed exclusively by a qualified professional. In case of self-installation, the warranty will be void, and the manufacturer takes no responsibility for any resulting damages.
1. Power Supply Connection:
- The controller requires a 12V DC power supply.
- Connect the red wire to the positive ignition power line, secured with a 10-amp fuse.
- Attach the black wire to the vehicle's ground point or the negative terminal of the battery.
2. Accelerator Pedal Signal Connection:
- The controller's yellow wire monitors the accelerator pedal signal, which is the 5V wire from the electronic accelerator pedal.
- You can identify this wire using a voltmeter: with the pedal pressed, it shows approximately 5V, and when released, it measures close to 0V.
- To find the correct connection point, check near the engine control unit (ECU) wiring harness or directly at the accelerator pedal connector.
3. Solenoid Connection:
- Use two of the solenoid's vacuum ports: one for the vacuum source and one for the blow-off valve. The third port must be left open to atmospheric air.
- If the third connection is not correctly vented, the valve may remain open, causing operational issues.
4. Timing Adjustment:
- Open the control box to access the potentiometer, which allows you to adjust the valve's opening duration between 0.1 and 1.5 seconds.
- The red LED indicator near the potentiometer confirms proper operation of the controller.
5. General Installation Tips:
- Ensure the required vacuum for the solenoid is sourced from the intake manifold pressure line.
- If the blow-off valve spring preload is too strong or the vacuum pump is insufficient, consider using an additional vacuum reservoir.
- Carefully check all electrical connections during installation to avoid damage to the ECU.
With this system, you can not only reduce turbo backflow, but also enhance your vehicle's unique sound experience!
