Greddy Type S bov Vaccum line placement
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From: London, On, Canada
Greddy Type S bov Vaccum line placement
Hello I have a greddy Type S bov, and Im unsure of the vaccum line placement... I have a t-splitter from my wastegate to the bov and a t-splitter from my Fuel Pressure regulator...
So what Im unsure of is which one goes to the top of the Bov and which goes to the bottom?
THanks I could post pics of it if necessary
So what Im unsure of is which one goes to the top of the Bov and which goes to the bottom?
THanks I could post pics of it if necessary
Thread Starter
Junior Member
Joined: Nov 2006
Posts: 101
Likes: 0
From: London, On, Canada
Re: Greddy Type S bov Vaccum line placement
I connected the top one to the Fuel pressure regulator, and the bottom to the wastegate... my bov now makes a weird whistling noise after revving the car
Re: Greddy Type S bov Vaccum line placement
Now if you had searched.... j/k
THe lower port connects the lower half of the diaphragm to boost (pre-throttle body). When you let off throttle, vac is introduced above, and boost remains below. The valve is opened faster, and with less boost. This helps with flutter and momentary compressor surge, but at the expense of holding higher boost. It should be a non-issue, since originally Greddy recommended to use the Type-R BOV above ~15psi anyways.
It can also help with keeping it closed at idle ever so slightly, since the FMIC's pressure drop can create an ever-so-slight vacuum in the charge pipes, which holds the valve closed a fraction farther. Enough to theorize about, but not enough for practical use...
THe lower port connects the lower half of the diaphragm to boost (pre-throttle body). When you let off throttle, vac is introduced above, and boost remains below. The valve is opened faster, and with less boost. This helps with flutter and momentary compressor surge, but at the expense of holding higher boost. It should be a non-issue, since originally Greddy recommended to use the Type-R BOV above ~15psi anyways.
It can also help with keeping it closed at idle ever so slightly, since the FMIC's pressure drop can create an ever-so-slight vacuum in the charge pipes, which holds the valve closed a fraction farther. Enough to theorize about, but not enough for practical use...
Thread Starter
Junior Member
Joined: Nov 2006
Posts: 101
Likes: 0
From: London, On, Canada
Re: Greddy Type S bov Vaccum line placement
lol I understand how it works and it's hooked up properly now, but it makes a weird whistle after revving (an unusual one, not the regular pssst sound), the motor is not building boost and it is either leaking slightly which sucks or something is wrong
Re: Greddy Type S bov Vaccum line placement
search under greddy type s on the 7th page they were talking about some whistling and leaving the bottom port open with no vac source but dont quote me on that search for the thread it only took me five minutes to find it.I would post the link but I thought you needed to know where to put the vac lines.
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