ok i have a greddy flange on my y-pipe that just arrived, so i need a greddy BOV! rx7 store lists 3 BOV's

1) Type S for FD
2) universal type S
3) universal type R
or any other bov that would fit a greddy flange.

whats the diff between these? and how do you decide which spring option to get? i figured i'd just ask instead of sorting through endless pages of BOV q's. thanks, heath

 

my new y-pipe w/ bov flange... im pretty sure its a greddy

 

You will want the Universal Type S.

The RX7 one mounts up to the stock y-pipe hose
You save more by going universal and having a flange welded on a pipe, like you have.

Type R is for higher boost.

Type S should more than suffice for powerful street car.

 

Get the Type S universal.

Type R is mainly for racing applications since it has a hard spring and is most useful above 17 psi. You can't really hear it either.

 

sorry this was meant to be posted in the 20 section... sorry guys. that is a y-pipe for a 20b.... i wonder if the S or R differ in the amount of flow they can handle since the 20b turbos should flow more air at the same psi.... anyway, i bet the S type should suffice... thanks for the input everyone! oh yeah, BTW i dont like that whistling sound at ALL... i can live with a swoosh, but frankly the quieter the better if it doesnt affect performance... i wonder if it would be a pain to hook up a return line into my intake piping? i havent made it yet but they will be single pipes... would it be better to return to the primary, or secondary, or it really doesnt matter?

 

oh yeah.... aluminum mounting flange? steel mounting flange?? does it matter? i have a flange welded on already dont i? or are they talking about the actual bov? thanks

 

You don't need a flange.

That's only if you are welding a flange on, which you already have done. Essentially all you need is the valve and the gasket. That's it.

 

Yeah, I was kind of wondering about that Y-pipe - it didn't look like any Efini Y-pipe I had ever seen

Anyways, getting quiet BOVs can really deprive you of one of the joys of life: pulling up next to people and blowing off right next to their window

 

hehe actually now that i think about it that kinda sounds fun... i also like the quiet sleeper type car too.... seems totally stock but will rock who ever wants to go at it