GReddy Type S BOV a good upgrade? Opinions plz!

[RaseR]

Hey all,

As per the title, I'm looking for opinions on the GReddy Type S BOV as I'm looking to upgrade from the std R32 BOV to an adjustable recirculating BOV that fits the stock location and I can set to open fully at higher boost (I run 12 & 16psi) as I suspect the std one is leaking. Basically I get an annoying leaking 'whoooshing' sound through my pod filter when I'm accelerating or even just using light throttle to maintain 100ks cruise...I've attempted blocking the small hole next to the piston in the std BOV (as per the associated thread on SAU) but this only helped marginally. Anyone had similar experiences with the std BOV?

Also, I noticed the GReddy Type S BOV has two fittings for vacuum source, as per my attached pic.....I read that the bottom one is only used in some installations, is this also true for Skylines? I want to retain a fairly stock look (to avoid cop attention!!) so it'd be ideal if all vacuum fittings had connected hoses!

Any opinions, experiences or skyline specific install info for the Type S BOV would be appreciated!

thanx!

[predator]

errr.. isn't the "whoooshing" sound just the sound u get from a pod. I doubt its the BOV leaking... although considering the age of the car it could be the stock bov spring has had its day which would cause it to leak.

[RaseR]

Hey predator.....That's what I always thought, this is the first turbo car I've owned but a friend of mine who used to have an R32 reckons his never made the 'whooosh' to the same extent mine does (had same pod as me too)...Also I've driven his new (old!) car - DR30 Skyline turbo @12psi with atmo bov and pod filter and all I heard was engine revving + turbo spool, no whooshing...so nothing at all like mine, this is what makes me assume the BOV may be leaking.

[Frosty]

as far as i know the stock BOV will leak after about 10psi

the whoosing will be coming from the POD that is installed on the car. If you are runing that amount of boost definetly go the aftermarket BOV. You should notice the difference and will hold boost a bit better too

my 2cents

[Steve]

good bov, fully adjustable so you can set where it lifts.

the second hosetail connector (the one pointing down in your pic) is used to help lift the valve when you have the spring tightened for high boost applications.

It works by plumbing it from in front of the throttle body (the other line connects to the plenum, as per normal) and when you take your foot off, it assists in pushing the valve open.

this allows you to tension the valve up higher than would otherwise be possible if you were using only vacuum to lift it off when the throttle shuts.

hope that makes sense.

[RaseR]

Thanks for the response Frosty and for that technical info Steve, that's exactly what I was looking for! A couple of additional questions though - if I was to use the secondary vacuum fitting as you described (ie. from a source in front of the throttle body), would you have any recommendations as to where I could fit the hose into the std intercooler piping? Would it be a case of having to drill/weld in a fitting? And at what stage/boost level would this 'vacuum assistance' be useful?

Thanks!

[Steve]

well I have mine close to the BOV (I have a trust type R). I am not 100% where it would be useful. I plumbed it up after I started running 1.7 bar. I havent re-adjusted my spring tension, but it now lifts off at around 0.4bar, whereas before, it didnt lift until around 1 bar.