HKS Super SQV4 Blow-Off Valve Kit with Suction Return for RZ34 Nissan Z [71008-AN030V]
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HKS Super SQV4 Blow-Off Valve Kit with Suction Return for RZ34 Nissan Z
The HKS Super SQV4 Blow-Off Valve Kit with Suction Return for the RZ34 Nissan Z mounts one Super SQV4 on each bank of the twin-turbo VR30DDTT, and the included return kit routes the released air back to the intake side. Each valve uses the HKS sequential two-stage structure with primary and secondary valves under differential pressure control, so it stays stable from low to high boost. It suits a Z owner who wants HKS valves on both turbos while keeping the vented air inside the system. Anyone set on a vent-to-atmosphere setup should know this version is built around the return kit.
Features
- Two Super SQV4 valves, each releasing excess boost from its own VR30DDTT turbocharger on throttle lift
- Sequential two-stage design with primary and secondary valves
- Differential pressure control with a pull-type relief layout for stable operation from low to high boost
- Suction return kit with return hose and return pipe that send released air back to the intake side
- Dedicated 4-ply silicone hose for the section between turbocharger and intercooler
- Molded return hose shaped to sit neatly in the engine bay
- Silver valve finish, listed by HKS Japan as Super SQV4 Silver
Applications
- Nissan Z: RZ34 | 2022-2025 | VR30DDTT
Notes
- This part number, 71008-AN030V, is the Super SQV4 Blow-Off Valve Kit version that HKS Japan lists with the suction return kit included
- HKS Japan lists the contents as the SSQV bodies, SQV hose, mounting bracket, return hose, return pipe and related parts
- HKS notes that some factory parts, including a wiring bracket, the cowl top cover and air cleaner, need modification during installation
- HKS does not list an engine management requirement for this kit
Frequently Asked Questions
- Does the Super SQV4 Blow-Off Valve Kit vent to atmosphere on the RZ34? No. The Super SQV4 Blow-Off Valve Kit for the RZ34 Nissan Z comes with the HKS suction return kit, which sends the released air back to the intake side. HKS Japan also notes that atmospheric release is not compliant for Japanese vehicle inspection, and this version keeps the air in the system.
- Does the kit include a valve for each turbocharger? Yes. HKS mounts one Super SQV4 on each bank of the VR30DDTT, so each valve releases excess boost from its own turbocharger. HKS says this layout gives stable operation from low to high boost pressure, and both valves come in the kit together with the hoses, bracket and return parts.
- Does the Nissan Z need a tune after installing the SQV4 kit? No. HKS does not list an engine management requirement for this kit in the information BA reviewed. Owners who already run a tune should still let their tuner know about the change, since the kit alters the charge piping between the turbochargers and the intercooler.
- How does the SQV4 differ from a basic blow-off valve? The HKS SQV4 is a sequential design with a primary and a secondary valve. Differential pressure control lets it open progressively across the boost range, and the pull-type relief layout keeps operation stable. On the RZ34 kit, HKS fits one SQV4 to each bank so every turbocharger has its own valve.
- Is the SQV4 kit difficult to install on the RZ34? The kit is a moderate job for an experienced installer. HKS notes that factory parts such as a wiring bracket, the cowl top cover and air cleaner need modification, and the charge piping between the turbochargers and the intercooler is changed to the dedicated 4-ply silicone hose. BA recommends professional installation.
About HKS
HKS is a Japanese performance engineering brand founded in 1973 and headquartered in Fujinomiya, Shizuoka, with a long-standing reputation for developing high-quality aftermarket parts and motorsport-proven technology for enthusiast and professional applications. Known for innovations in turbocharging and engine performance, HKS produces a broad range of components including exhaust systems, turbo kits, electronics / engine management, and suspension solutions, with product development heavily influenced by decades of involvement in racing disciplines such as circuit time attack, drag, and drifting.
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Product Size Guide
Please refer to the general size reference below to better understand how this product may fit into your space. Dimensions may vary slightly depending on the design and materials.
| Category | Small | Medium | Large |
|---|---|---|---|
| Decor & Accessories | Up to 10″ | 10″ – 20″ | 20″+ |
| Tables | Up to 30″ | 30″ – 60″ | 60″+ |
| Seating | 1 Seater | 2–3 Seater | 4+ Seater |
| Storage Units | Compact | Standard | Large Capacity |
| Lighting | Small Fixture | Standard Fixture | Large Fixture |
Note: For exact product dimensions, please refer to the specifications section above. This guide is intended as a general reference only.
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HKS Super SQV4 Blow-Off Valve Kit with Suction Return for RZ34 Nissan Z [71008-AN030V]
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