These pages are devoted to the 1991 3000GT VR4
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GREDDY TYPE "S" BLOW OFF VALVE INSTALL

This is a fairly straight forward install when the straight flanged adapter is included with the kit.
The Type "S" installs the same way the original comes out. It is a recirculating type Blow off valve,
meaning it recirculates the blow off back into the Y pipe so you loose less boost air.
Venting a BOV to atmosphere will lose all boost vented therefore causing the turbos to have to
recover from the lost boost pressure, so recirculating it makes sense to maintain performance.
Here is a photo of the Greddy installed in the same place as the original. I did use the new hose
provided for the install only because it was a new hose. There was nothing wrong with my old hose.
There is a protector sleeve around the original hose which I transfered over to the new hose for the same
reason it was on the original. To keep the hose from rubbing and wearing a hole in it.

The Vacuum Hose I mentioned replacing is also straight forward. Run it the same as the original
or if you choose, reuse the original, however it is best to replace it either way only because
it is new and it came with the kit. I advise reusing the rubber shield however.
Here are a couple more photos along with one of the original BOV.
Have Fun!!!


 

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Photos and text Copyright John C. Adams  Use prohibited without authorization.
For questions send e-mail   Last Update  04/04/01