This presentation will cover the conversion of the stock Pop-Off valve on a Nissan 300ZX Z31 which is set for about 8 psi to a higher psi.
The boost can be increased on the turbo by installing a boost controller. Visit www.bobsharpzcarclub.org to find out how. When the boost is increased above the stock pop-off valve (relief valve) the stock valve will bleed of the boost.
There is a number of ways to make this mod. One is the “washer method”, and the “drill the hole and install the spring,” I am sure there are other methods. The hole can be pluged with a 1” npt plug. You can also, search Ebay.com for a HGK or Greddy out of production valve.
The old valve needs to be disassembled to make the needed modifications. The top of the valve cover is drilled out where the pin holds the valve together.
