TTFD

yea thats what happened to me, it takes a little while to adjust the nut perfectly. too loose and it leaks, too tight and it wont blow out any air.

Fd3BOOST

Thanks Sean

Fe3Boost

sounds like a new-b question dave! just busting hahahahha

TheCamel

Welcome, if you need more info on it let me know I will get you the hookup diagram for it.

Fd3BOOST

No worries, hey how would I know. It didn't come with any instructions that say what the adjustment is for. Anyway, whats with you wrecking cars at PFS and then quiting and not telling me about it? That sounds like newbie driving to me.. HAHAHAH Just bustin

Fd3BOOST

That woudl be cool Sean, if nothing else we could pin the thread in the FAQ after that. I would like to know the exact purpose of the 2nd nipple.

TheCamel

Install the new bypass valve onto the I/C pipe flange with the gasket supplied with the valve.



The GReddy valve has two fittings for small vacuum lines on it. The top fitting is for the same hose that went to the original stock bypass valve, the hose that goes to the intake manifold. The lower fitting is normally left open. It is a vent for the lower chamber of the valve.



On some cars with large turbos, compressor surge at light throttle lifts can be further reduced by connecting the lower fitting to a pressure source. Typically a fitting is added to an I/C pipe between the turbo outlet and the valve.

TheCamel

The GReddy Type S bypass valve is adjustable. To make the adjustment, looses the 10 mm nut on the top of the valve. Using a 3 mm Allen wrench, rotate the small screw in the center. Looses it all the way out until you feel no tension on it. That is the maximum looseness possible. With the screw all the way flush with the top of the nut, that is fully tight. Normal adjustment for most cars is right about in the middle (see photo above). If the valve is too loose you may loose boost pressure. The valve will close slowly and will make a little squeak sound at the end. If it is too tight, you will hear compressor surge. Surge sounds like a "JUhh juhh juhhew" sound when you let off the throttle. It may sound cool but it will damage your turbo. That is the sound of air bouncing off the throttle plate and going back out the turbo as it is also being pumped in... too tight