Bov Upgrade Question
Newbie
Joined: Aug 2004
Posts: 10
Likes: 0
Originally Posted by HobieKopek
......And as far as performance goes, as long as your BoV isn't leaking compressed air, and opens when there's sudden pressure drop, you will not gain from "upgrading" it. The best BoV you can have is one that does not leak, and opens when you need it. How it looks and how it sounds are just frills, but if that's where you want to put your money, then at least be aware that's all you're getting from it.
Also I thought that the BOV can actually be too tight and then you'll get something like compressor surge. Which is not good, right? Sorry still a FNG used to own a 350 now has a EVO, and learning guy.
as far as blow off valves, there are only 2 that you need to worry about. the stock eclipse valve will be cheap and easy look like nothing and sound like nearly nothing as ive been told. i guess on stage 2 you can hear it a little bit. by spending the money on the second choice, the greddy type-s , you are gaining nothing other than a shiny purple bling peice and a crazy sick sound, if that what you like and want. there are no performance gains to be had by recircing any different valves. the term "upgrade" when talking about blow off valves is like hobie said, merely applies to looks and sounds. as for it being too tight, yes, if the valve spring is too tight the air coming back towards the turbo when letting off the gas will not be enough to open the valve and some, or all of it may travel back up to the compressor and try to spin that mother the wrong way (compressor surge), which is very very very not good.
RALLY: Too tight would mean it doesn't open under sudden pressure change. That's one of the two qualities and BoV should fulfill to function properly.
Viciouz: If you want to change you can use pretty much anything that recirculates. You won't notice much of a difference, if any, but that's pretty much what my entire first post said. I don't know what flanged Road Race uses, but you can have just about any shop with someone who knows how to weld fit a flange for you regardless.
Hotshot: I beg to differ that there's only 2 you need to worry about. It's more a matter of pragmatism. Just because Road Race offers them does not make them the best. They are both fine units, but neither is the best at what it does. They're simply both quality units that are readily available and inexpensive. I would venture to guess that the Type-S is their standard upgrade because, when they first came out with their kit, it seemed to be the most requested, and most easily suited for the kit's needs. I'm sure Rob or Boe could comment on that, just my observation thinking back because the Type-S offers no amazing intake-charge-venting-superiority over any other quality BoV.
Viciouz: If you want to change you can use pretty much anything that recirculates. You won't notice much of a difference, if any, but that's pretty much what my entire first post said. I don't know what flanged Road Race uses, but you can have just about any shop with someone who knows how to weld fit a flange for you regardless.
Hotshot: I beg to differ that there's only 2 you need to worry about. It's more a matter of pragmatism. Just because Road Race offers them does not make them the best. They are both fine units, but neither is the best at what it does. They're simply both quality units that are readily available and inexpensive. I would venture to guess that the Type-S is their standard upgrade because, when they first came out with their kit, it seemed to be the most requested, and most easily suited for the kit's needs. I'm sure Rob or Boe could comment on that, just my observation thinking back because the Type-S offers no amazing intake-charge-venting-superiority over any other quality BoV.
Well one BoV doesn't know any better than another so I'm not sure what you're getting at with that, but looks and sound are subjective, personally I feel quality amongst name brands is about the same, and any working BoV vents. 
Evolving Member
Joined: Aug 2002
Posts: 420
Likes: 0
From: Las Vegas, NV
Speaking from experience, the only performance gain that a BOV would create is with one that does not leak internally. Like the one I have now, it leaks at anything above 2 psi and I hope what is causing my problem. That's why I am going with the Greddy Type S because I know it is a lot more stable and dependable.
Last year there were dual writeups in both Turbo Magazine and Sport Compact Car comparing all the major BoV's on the market. Not suprising they recycled material since they're both owned by the same company, but the Turbo Mag article had better technical comparisons including ability to hold boost, what can be recirculated, and various other useful tidbits of info.
Originally Posted by HobieKopek
Well one BoV doesn't know any better than another so I'm not sure what you're getting at with that, but looks and sound are subjective, personally I feel quality amongst name brands is about the same, and any working BoV vents.
