Greddy Type S BOV

BAC5.2 · Post by **BAC5.2** » Wed Mar 16, 2005 8:17 am

I remember someone on here is/was running that valve.

Any other experience with it? How did you like it?

I am converting my friends WRX to a stage4, and he might give me his stock IC and a TypeS bov.

The joys of being able to do the work that people normally pay a shit load of money for.

I just want something that closes completely at idle. I don't have the adapter plate from my HKS valve anymore (hacked it). I might just try to find another plate and use that BOV. I like the HKS valve. It works pretty well, and sounds cool.

Venting next to a truck, is SUPER loud. It's neat.

-K- · Post by **-K-** » Wed Mar 16, 2005 8:41 am

I can't remember who has one but there should be plenty of people with them on NASIOC. If they seal on a WRX they should do the same on your car.

I'm not sure how loud I want mine so I got the fully adjustable GFB valve, call me a pussy but if I get sick of the sound I can just set it to recirc.

555BCTurbo · Post by **555BCTurbo** » Wed Mar 16, 2005 7:54 pm

RIIIIIIIIIIIIICCCCCCCCCCCE

Just Kidding

dzx · Post by **dzx** » Sat Mar 19, 2005 11:29 pm

I thought you had a HKS bov? My car is running the greddy type s

free5ty1e · Post by **free5ty1e** » Sun Mar 20, 2005 12:32 pm

I've got the greddy type s. If its adjusted too soft then yes it will leak at idle. As long as it's the last thing the air passes through before entering the throttle body, there should be no boost leak issues. Unfortunately, with top-mount Saab ICs, the BOV kinda has to go before the intercooler, introducing a pressure drop between the BOV and the TB, so at higher boost levels the BOV will see this as a closed throttle plate (difference between the pressure it sees and the pressure from the manifold) and decide to start spitting off some of the pressure.

You could run this BOV as recirc. to avoid boost leak problems but it can be adjusted to work as atmospheric in the Legacy.

91White-T · Post by **91White-T** » Sun Mar 20, 2005 5:29 pm

The Type S worked great on my SS. Had it in front of the saab IC and never had a leak. It takes a few mintues of playing with the adjustment screw, but it works great once you get it.

bluesubaru · Post by **bluesubaru** » Tue Mar 22, 2005 2:41 am

I messed and messed with the type s for weeks trying to get it to work right.
It was either too tight and would compressor surge, or two loose and leak, and sometimes both at the same time.
I eventually went to recirc and it fixed a lot of problems.
Good luck

BAC5.2 · Post by **BAC5.2** » Tue Mar 22, 2005 7:58 am

free5ty1e wrote:I've got the greddy type s. If its adjusted too soft then yes it will leak at idle. As long as it's the last thing the air passes through before entering the throttle body, there should be no boost leak issues. Unfortunately, with top-mount Saab ICs, the BOV kinda has to go before the intercooler, introducing a pressure drop between the BOV and the TB, so at higher boost levels the BOV will see this as a closed throttle plate (difference between the pressure it sees and the pressure from the manifold) and decide to start spitting off some of the pressure.

You could run this BOV as recirc. to avoid boost leak problems but it can be adjusted to work as atmospheric in the Legacy.

That's why I am running the HKS valve. As I understand it, It doesn't use a pressure differential between the "charge pipe" and the intake manifold. It references to manifold pressure alone. I.e. If there is boost in the manifold, it pressurizes an air bladder of sorts, and as the manifold pressure drops, the created vacuum pulls back on a diaphram, which pulls back on a valve, and that vents the trapped charge pipe air.

The HKS valve can't really leak on boost, but piston style valves, can, as charge pipe pressure exceeds spring pressure.

The HKS valve can simply open to fast or two slow (as you adjust the volume capacity of the air chamber).

The HKS valve is ungodly loud. When your 1994 Legacy has the loudest BOV of the day at a Dyno Day, you have a LOUD bitch. I DID make the third highest Subaru power of the day I believe

.

free5ty1e · Post by **free5ty1e** » Tue Mar 22, 2005 1:46 pm

I suppose it would be an experiment of sorts to get a time running atmospheric with the type S, and then have a plugged fitting to hook it up as recirc and try again.

The type S is diaphragm-based, the stock valve is piston-based.... correct? Type s has two reference fittings, one for manifold pressure and one for atmospheric pressure.

That HKS valve sounds nice though. I wouldn't have cared about the BOV all that much except that I already had the type S from a previous project car.

BAC5.2 · Post by **BAC5.2** » Tue Mar 22, 2005 2:50 pm

Where do you run the atmopsheric reference hose?

I'll see how it goes.

I have never even heard the TypeS, lol. I will probably run recirc, to get some sleeper back in it.

bluesubaru · Post by **bluesubaru** » Tue Mar 22, 2005 5:34 pm

the type s is more like a loud whistle, and the hks is a long/short psshhh.
Either way I dont care, the typs came with my IC, and my car runs a hell alot better with it being recirc. I get better gas mileage, no rough idle, and no 100% IDC.
I might experiement with 50/50 BOV by WORX, APS or TurboXS. Best of both worlds.

Innovative Tuning · Post by **Innovative Tuning** » Tue Mar 22, 2005 9:04 pm

The Greddy Type S leaks above 17psi. I'm not guessing....we used a Snap On pressure tester on it.

bluesubaru · Post by **bluesubaru** » Tue Mar 22, 2005 9:33 pm

well I am not worried about the leak at that high of boost, I just want it to stay close at idle and not surge. Mine wont do that unless I recirc.

BAC5.2 · Post by **BAC5.2** » Wed Mar 23, 2005 3:10 am

I am worried about leaking. I run just below 17psi.

free5ty1e · Post by **free5ty1e** » Wed Mar 23, 2005 1:43 pm

Innovative Tuning wrote:The Greddy Type S leaks above 17psi. I'm not guessing....we used a Snap On pressure tester on it.

.... are you sure that wasn't just your type S? That's pretty weak of Greddy to make an aftermarket racing product that can't hold aftermarket boost levels. Not having run that high yet, I can't say if that's true or false, but that sucks if it's true. (ok, blows)

Guess I'll have to start looking at blowoff valves once I get ready to run some good boost levels.... or just run the type S recirc so it at least leaks back into the system. Dag nabbit.

The atmospheric reference fitting I've just been putting a hose on and running it somewhere away from my hood scoop and facing downwards (just leaving it open) so's rain won't just fall into an open fitting on my BOV. As far as I can tell you're not supposed to connect it to anything, just let it read atmospheric pressure. The other line goes to the manifold fitting, of course.

dzx · Post by **dzx** » Thu Mar 24, 2005 11:37 am

Mine was holding well over 30psi when the engine blew.

free5ty1e · Post by **free5ty1e** » Thu Mar 24, 2005 1:51 pm

now THATS a story I want elaboration on.... which turbo was that?

dzx · Post by **dzx** » Mon Mar 28, 2005 10:18 pm

16G. I had the mbc clamped down all the way and let a friend drive the car. I told him not to stand on the gas in fifth but to control the boost with his foot and keep it under 15 psi however he got carried away racing a bmw and just stood on the pedal. A few blocks later, the street was covered in smoke and the engine was done.

free5ty1e · Post by **free5ty1e** » Tue Mar 29, 2005 5:45 am

damn. That blows. Or at least, it used to.

free5ty1e · Post by **free5ty1e** » Sat Apr 09, 2005 12:45 pm

Update - it would seem that I have angered the diaphragm of my Type S. It now seems content to spit out any positive boost levels, making it very tough to drive normally. I approached 17psi on the highway in 5th and what do ya know, it didn't like it.

So... I like the design of the HKS SSQV. So... I bought one. I'll be installing it today, hopefully. A local speed shop happened to have one in stock, got it for $205 + $30 for the flange. I like when a blowoff valve is guaranteed by the manufacturer not to leak under any level of boost, or at idle.

http://www.hksusa.com/products/more.asp?id=792

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Greddy Type S BOV

Greddy Type S BOV