Kinugawa Turbo Big Head Adjustable Wastegate Actuator — Single & Dual Port 2-in-1, Universal Fit with Full Rod Kit

The Kinugawa Big Head Adjustable Wastegate Actuator is a universal, bolt-on internal wastegate upgrade designed for turbocharged performance builds that demand precise, repeatable boost control. Under high boost, the factory actuator's weak diaphragm spring allows the wastegate to blow open prematurely — robbing mid-range torque and capping peak power. Bleed orifices compound the problem. Kinugawa's enlarged diaphragm head and precision-wound spring hold the wastegate closed longer, delivering quicker spool, sharper throttle response, and sustained peak boost for superior acceleration and mid-range pulling power.

This kit ships with a 15 PSI spring pre-fitted on the actuator head, plus a full set of 6 additional springs and 4 straight rods in multiple lengths — giving you everything needed to dial in the exact boost pressure and rod geometry for your application. The 2-in-1 integrated design supports both single-port and dual-port wastegate configurations without modification.

Key Performance Benefits

Enlarged diaphragm area increases spring pressure and wastegate hold force
Keeps the wastegate valve seated longer — higher peak boost achieved sooner
Produces strong torque from idle through the full RPM range
Crisp, controlled boost response — eliminates boost creep and mid-range sag
2-in-1 integrated spring: single and dual port exchangeable in one unit
Multiple rod lengths included for universal fitment flexibility

Single Port vs. Dual Port — What’s the Difference?

Single Port Actuators
Boost reference is supplied to one side of the diaphragm. The wastegate opens in one direction; spring pressure alone handles the return stroke and holds the wastegate closed. Best suited for basic boost control via a manual boost controller (MBC) or electronic boost controller (EBC). Simple plumbing, straightforward setup — ideal for street and mild performance builds.

Dual Port Actuators
Boost reference is supplied to both sides of the diaphragm, enabling bidirectional control of the wastegate — both opening and closing. Spring pressure is pneumatically assisted on the return stroke, allowing a softer spring to achieve the same or higher boost targets with greater precision. Recommended for high-boost applications, high exhaust backpressure environments, or oversized wastegates. Best used with an EBC for maximum tunability.

Tech Tip: Dual port actuators can also be run as a traditional single port — simply leave the lower actuator port vented to atmosphere. This makes the Kinugawa 2-in-1 design a future-proof choice for any build.

Application & Rod Specifications

Single and dual port exchangeable — 2-in-1 integrated spring pressure
Integrated spring ratings: 3 PSI inner / 7 PSI inner / 7 PSI middle / 11 PSI middle / 10 PSI outer / 7 PSI outer
Rod lengths included: 130 mm, 150 mm, 165 mm, and 180 mm
End fitting hole diameter: 6.3 mm

Kinugawa Big Head Adjustable Wastegate Actuator — Rod Length Specifications and Application Diagram

Kit Contents

1 × Kinugawa Big Head Dual Port Adjustable Actuator Head (15 PSI spring pre-fitted)
6 × Springs (assorted pressure ratings)
4 × Straight rods (130 mm, 150 mm, 165 mm, 180 mm)
1 × End fitting (hole diameter: 6.3 mm)
2 × Nuts for bracket connection
1 × Nut for rod
1 × Dual port block fitting
1 × Vice tool
1 × Installation instruction sheet (download PDF)

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Installation Notes — Preload & Setup

Apply 2 mm of preload to the actuator rod during installation
For clevis-type applications: set 2 mm preload on the wastegate valve arm, then verify with compressed air at a pressure slightly above the actuator’s rated spring pressure
Spring surface paint is used for color identification only — it does not affect spring function or performance

Product Details

Brand: Kinugawa Turbo Systems
Condition: Brand New
Port Type: Single & Dual Port (2-in-1 Integrated)
Default Spring: 15 PSI (pre-fitted)
Rod Lengths: 130 mm, 150 mm, 165 mm, 180 mm
End Fitting Hole Diameter: 6.3 mm
Country of Origin: Taiwan
HS Code: 841191
Weight: 1 kg

Actuator for Kinugawa