-10%
Click to zoom in
SKU: TS-0505-2001 | UPC: 9329677010282
Turbosmart WG40 3PSI Inner Spring Brown/Black 2002-2021 Subaru WRX STI Evo
This Turbosmart WG40 3PSI inner spring in brown/black delivers precise low-end boost control for 40mm Turbosmart wastegates. It fits popular turbocharged vehicles like Subaru WRX STI Mitsubishi Lancer Evolution and Nissan models with compatible wastegates. Engineered for durability it maintains consistent performance under high heat and pressure.
Key Features
- 3 PSI Rating: Establishes accurate base boost pressure ideal for street and track setups requiring fine-tuned low boost levels
- Brown/Black Color Coding: Quick visual identification during assembly and maintenance prevents mix-ups with other spring strengths
- WG40 Compatibility: Direct fit for all Turbosmart 40mm wastegates including Gen V Race Compact and Plumb Back models
- High-Temperature Spring Steel: Withstands extreme exhaust temperatures up to 1000C for long-lasting spring tension and reliability
- Precision Wound: Consistent coil tension ensures repeatable boost response across thousands of cycles
Product Notes
- Use with outer springs to achieve desired total boost pressure combinations
- Inspect spring seat and diaphragm during replacement for optimal sealing
- Packed in protective sleeve ships flat to minimize damage
Installation Notes
- Professional installation recommended.
- Remove wastegate actuator compress spring carefully using dedicated tool
- Compatible with factory Turbosmart hardware no additional parts required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza WRX | All |
| 2004-2021 | Subaru | Impreza WRX STI | All |
| 2003-2005 | Mitsubishi | Lancer Evolution | VIII MR |
| 2006-2006 | Mitsubishi | Lancer Evolution | IX MR |
| 2003-2008 | Nissan | 350Z | Track |
| 1989-2002 | Nissan | Skyline | R32 R33 R34 GT-R |
| 1995-2002 | Mitsubishi | Eclipse | GSX |
Why Choose Turbosmart?
- Hand-crafted in Sydney Australia since 1997 with strict quality control
- Rigorous in-house testing exceeds industry standards for reliability
- Innovative design backed by dedicated research facility and staff expertise
Frequently Asked Questions
-
Q: Does this spring fit all Turbosmart 40mm wastegates?
A: Yes it installs directly in Gen V WG40 Race Compact Plumb Back and IWG75 Series wastegates for seamless boost adjustment -
Q: What material is the spring made from?
A: High-grade spring steel heat-treated for superior fatigue resistance and corrosion protection in harsh turbo environments -
Q: What warranty applies?
A: Lifetime warranty against manufacturing defects when installed and used as directed contact Turbosmart for claims
Shipping & Handling
- Method: USPS First Class or UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Protective poly sleeve in 4 x 4 x 1 inch box
- Weight: 0.2 lbs
Blow Off Valve Accessories
Blow off valve accessories let you customize and upgrade your BOV system for better response, louder sound, or improved sealing. From recirculating adapters to replacement springs and diaphragms, these parts keep your blow off valve performing at its best. Popular ProductsTop BOV accessories include replacement piston kits, diaphragm rebuild kits, flange adapters, and sound pipes. Brands like Turbosmart, Tial, and HKS offer direct-replacement accessories compatible with their BOV lines. What blow off valve accessories do I need?Common BOV accessories include replacement O-rings and diaphragms for worn seals, flange adapters for different pipe diameters, and spring kits for adjusting cracking pressure to match your boost level. Can I make my blow off valve louder?Yes, venting your BOV to atmosphere instead of recirculating produces a louder sound. Atmospheric vent kits and sound pipes are available for most bolt-on BOV units to maximize the flutter or horn sound. Explore related cate...
View Blow Off Valve Accessories Products
Forced Induction
Forced induction systems encompass every method of pushing air into an engine at greater than atmospheric pressure, including turbochargers driven by exhaust energy, superchargers driven mechanically by the crankshaft, and prochargers using centrifugal designs belt-driven at higher ratios than traditional roots-type blowers, with each approach delivering a significant increase in air mass per cylinder fill that allows proportionally more fuel to be burned and more power to be produced without increasing engine displacement. Adding 10 PSI of boost pressure to a naturally aspirated engine can increase power output by 50 to 70 percent depending on the engine's breathing efficiency and the quality of the supporting hardware, making forced induction the most power-dense modification available relative to cost and complexity. This collection covers complete forced induction systems, turbocharger and supercharger hardware, intercoolers, blow-off valves, wastegates, and supporting component...
View Forced Induction Products
Turbosmart
Turbosmart is an Australian performance brand that has engineered boost control, turbo management, and forced induction products since 1998. Their lineup spans blow-off valves, wastegates, boost controllers, fuel pressure regulators, gauge manifolds, and turbo system accessories trusted on street cars, circuit builds, and drag racing applications worldwide. Popular Turbosmart Products The Turbosmart product range includes the Kompact and Race Port blow-off and bypass valve series, the Dual Port recirculating blow-off valve, the Hyper-Gate and Gen-V internal and external wastegate series, the e-Boost and e-Boost Street electronic boost controllers, the FPR 800 and FPR 1200 fuel pressure regulators, and the Boost Tee manual boost controller for entry-level boost management. Turbosmart products are available for Subaru, Mitsubishi, Ford, Nissan, Toyota, and many other turbocharged platforms with vehicle-specific fitment options. What makes Turbosmart blow-off valves popular? Turbosmart...
View Turbosmart Products