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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Contents
Please verify that the following parts are included in the box.
PART NUMBER QTY DESCRIPTION
WG002 1 External wastegate assembly
WG002-104 1 Small natural 1.5 psi wastegate spring
WG002-103 1 Medium yellow 3 psi wastegate spring
WG002-102 1 Medium red 6 psi wastegate spring
WG002-101 1 Large green 9 psi wastegate spring
WG002-100 1 Large blue 18 psi wastegate spring
WG002-026 2 Pressure port cap
WG002-019 2 Seal washer
WG002-010 1 Valve seat
WG002-011 1 304 Stainless steel inlet flange
WG002-050 1 Inlet clamp assembly
WG002-012 1 304 Stainless steel outlet flange
WG002-051 1 Outlet clamp assembly
PW66-MAN 1 Instruction manual
*** Note: Two springs are pre-installed ***
SPRING NOTES:
Date Springs installed
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PART NUMBER: PBO085-3000
NAME: PW66
DESCRIPTION: 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. This causes exhaust flow to be diverted away from the turbine side of the turbocharger,
effectively slowing and/or stabilizing the turbine wheels’ speed. This stabilization results in a smooth
and steady boost pressure level, created by the compressor wheel of the turbocharger. Open pressure of
the valve can be controlled via spring rate and or a boost controller, such as a manual boost controller or
an electronic boost controller.
(The upper and lower banjo bolts and fittings are sold separately; part number PBO085-2114)
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PART NUMBER: PBO085-3000
NAME: PW66
DESCRIPTION: 66MM EXTERNAL WASTEGATE
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