i just installed a greddy type-s bov on my evo and i'm having some problems. just as it gets to 3000rpm it starts making a weird high pitched whistling noise. it's hard to describe. i don't think it's normal b/c all my friends that have it don't sound like that. hope someone can help me out with this or if i have a leak of some sort. thanks

 

sorry cant help much cause i dont have one, but is the bov installed correctly and not backwards?

 

maybe this will help
https://www.evolutionm.net/forums/sh...problem+greddy

 

try a search

 

https://www.evolutionm.net/forums/sh...install+greddy

 

You've probably plumbed the vacuum signal hose on the bottom plug fitting instead of the top one which blows it open as soon there is a positive pressure. Look to see if you've got the fitting on the top, not at the bottom.

 

i don't have a problem with idling and the vacuum hose is on the one that is perpendicular to the bov, not the one that comes off it diagonally. i basically help it up to the stock one and but the hoses on the openings that matched...is that correct or should i have hooked it up the other way around?

 

yes try to make sure its not installed backwards. I hear of this many times with the Greddy Type S.

 

is it supposed to sit vertical or horizontal???

 

The flanged part goes to the hose connected to the Upper i/c piping.

 

does anyone have a picture of one installed?

 

yea give me a sec.

 

the batteries in my camera are dead and I'm at work. Check this link 10th post down

https://www.evolutionm.net/forums/sh...ad.php?t=93621

 

ok so the purple is not supposed to pointed on top. that is kinda how mine looks except for the vacuum hose for mine is in a different spot...you have to look behind the bov to see it. whereas that one looks like it goes around to the front

 

Yea I unbolted the top of the BOV and turned it so it wouldn't hit the upper rad hose. It dosn't matter as long as the vac line isn't getting pinched.