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Thank you for purchasing our PW66 external wastegate. With over 60 years of combined turbocharger
development and racing experience, we at Precision Turbo take great pride in providing you with the
best external wastegate on the market today. The PW66 is made from high grade, high temperature
stainless steel and billet aluminum components. It features our own purpose designed Kevlar reinforced
wastegate diaphragm and a 347 stainless investment cast valve body. Our investment cast valve body
has a smooth internal surface and the largest valve on the market today. This gives you better flow and
more accurate boost control. The PW66 features a Nickel Chromium Alloy valve and 5 different 17-7
precipitation hardened springs. Also included are stainless steel inlet and outlet flanges with clamps.
With a satin black anodized, 6061 aluminum billet wastegate cap you will have years of good looks and
protection from the elements. The PW66 is generally compatible with most aftermarket manual and
electronic boost controllers on the market today. If you have any questions or need any technical
support, our experienced Sales Staff are here to help.
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Summary of Contents for Precision PW66
- Page 1 Precision Turbo take great pride in providing you with the best external wastegate on the market today. The PW66 is made from high grade, high temperature stainless steel and billet aluminum components. It features our own purpose designed Kevlar reinforced wastegate diaphragm and a 347 stainless investment cast valve body.
- Page 2 PART NUMBER: PBO085-3000 NAME: PW66 DESCRIPTION: 66MM EXTERNAL WASTEGATE Contents Please verify that the following parts are included in the box. PART NUMBER DESCRIPTION WG002 External wastegate assembly WG002-104 Small natural 1.5 psi wastegate spring WG002-103 Medium yellow 3 psi wastegate spring...
- Page 3 66MM EXTERNAL WASTEGATE Operational overview Your PW66 wastegate, controls turbocharger boost, by bypassing turbine inlet exhaust gas via a spring loaded valve diaphragm assembly. Spring rate, in conjunction with boost pressure signal, and back pressure control the opening point of the wastegate valve. Once the spring rate has been over come, the valve will open.
- Page 4 66MM EXTERNAL WASTEGATE Installation Instructions Note: The optimum mounting and placement of your new PW66 wastegate will be determined by your manifold and turbocharger configuration. These notes should be considered when installing your new wastegate. Be sure to install the valve seat into the body of the wastegate before final installation.
- Page 5 DESCRIPTION: 66MM EXTERNAL WASTEGATE Wastegate spring removal and installation 1. Remove the PW66 WASTEGATE from the inlet pipe. USE CAUTION AS THE WASTEGATE MAY STILL BE VERY HOT! 2. WARNING! THE WASTEGATE CAN TOP IS UNDER HIGH SPRING TENSION. USE SAFETY GOGGLES AND REMOVE WITH CARE.
- Page 6 PART NUMBER: PBO085-3000 NAME: PW66 DESCRIPTION: 66MM EXTERNAL WASTEGATE Wastegate spring removal and installation continued 3. Remove the spring top plate and spring/springs from the wastegate. Determine which spring/springs you will be installing using the Wastegate Spring Utilization Chart on page 8. Install the spring/springs into the wastegate, on top of the diaphragm and install the spring top plate on top of the springs.
- Page 7 CAUTION: Precision Turbo recommends that the air/fuel ratio be checked while setting the boost levels. Raising your boost levels will change the air/fuel ratio of your tune up and could...
- Page 8 Example: Natural small spring + Red medium spring + Blue large spring = 16.6 psi. WARNING: Installing higher spring rate springs into your PW66 wastegate, may cause higher than expected boost levels. It is recommended to reduce your boost controller back to its minimum setting, and monitor your new minimum boost level with the new spring or springs, before increasing your boost pressure.