Greddy Type S Leaking pretty bad

[98spydert]

This is a debate that has been going on, on this forum for a couple of years now. I have run my Type-S lower nipple hooked up, and unhooked up to that one nipple off of the turbo, and although I've never done any boost leaks, the car stays on whatever boost I set it for, and I have NO preassure surge issues with my turbo. As been stated, the bov opens easier, and is more adjustable. I think it really depends on peoples mods, and how much boost someone is running as far as how this bov reacts.

With the bottom nipple connected, the Type-S sounds like it is blowing off smoothly the way a bov is supposed to do, with not connected, there are just too many issues with the valvle not opening properly, or blowing off the way it is supposed to. At least on my car anyway. I run my car daily on 15-17 PSI with an FP BigT28 and I don't have noticeable boost leaks. The car runs strong, and hard, even when gunning it on the highway at 17PSI, and the bov sounds healthy, and I don't have too much annoying back compressor sounds.

Also be aware that all those noises the Type-S makes that may sound like compressor surge, may just be the valve flutterring, and not necessarily compressor surge.

I would have posted that same exact post a week ago, but after using an air compressor to presurize the charge pipes and watching the Type S leak at any psi, whether it's 4 or 20+, the lower nipple hurts more than helps. If you look at the construction of the valve, there's no gasket, o-ring, no kinda of seal seperating the lower part of the valve where air would enter the lower nipple from the dump tube. It's metal on metal. I even took it apart and RTVed the hell out of it and it still wasn't a good enough seal.

If I were you, I'd do a boost leak test with both nipples pressurized and just see for yourself. I never thought I had a leak either. Spool up was decent and according to the gauge pressure never fell off or stuttered or anything that would have made me think about a leaky BOV.

 

[WSU99GSX]

The Type-s and Type-RS are very similar as far as construction, the newer Type-RS does not have a lower nipple, but has a hold where the lower nipple is on the Type-S, is greddy telling us something?