Blow off valve
Thread Starter
Joined: Apr 2004
Posts: 3
From: United States
Blow off valve
hey i own a 2000 s4 with upgraded ecu and turbos. wondering if there is a quality blow off valve that won't decrease perfomrance that much but will give me a showy sound (psssssttt)....any help would do...thanks..
1st Gear
Joined: Jan 2003
Posts: 413
From: United States
RE: Blow off valve
i was debating whether to move your thread to the S4 or just delete it....
i hope that knowleable S4 owners will find a solution for your problem, in the meantime get familiar with detonation, you'll need the knowledge
3rd Gear
Joined: May 2003
Posts: 2,659
From: United States
RE: Blow off valve
Thanks Firestarter1984 !!
You don't want a Blow off valve. You want a DV (diverter valve) or BPV (by pass valve); both are the same thing, but they are NOT a BOV!!
In short: The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
DV's:
Bailey = Probably the most popular, serviceable, $$$
Forge = Large (may have fitment problems), serviceable, $$
Forge Race = Larger than others (see above), adjustable, serviceable, $$$
Hyperboost = Cosmetic package, not serviceable, $$
Hyperboost Adjustable = New, cosmetic package, may not fit S4, adjustable preload, not serviceable, $$$
Hyperboost HX = Newest, very cosmetic package, new internals, not serviceable, $$$
OE Bosch 710N = Basic upgrade, popular with budget-minded modders, not serviceable, $
OE Bosch Sport 110 = MTM upgrade, same as 710N with "better" internals, not serviceable, $$
$ = under $50 USD
$$ = $50 - $150 USD
$$$ = Over $150 USD
You don't want a Blow off valve. You want a DV (diverter valve) or BPV (by pass valve); both are the same thing, but they are NOT a BOV!!
In short: The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
DV's:
Bailey = Probably the most popular, serviceable, $$$
Forge = Large (may have fitment problems), serviceable, $$
Forge Race = Larger than others (see above), adjustable, serviceable, $$$
Hyperboost = Cosmetic package, not serviceable, $$
Hyperboost Adjustable = New, cosmetic package, may not fit S4, adjustable preload, not serviceable, $$$
Hyperboost HX = Newest, very cosmetic package, new internals, not serviceable, $$$
OE Bosch 710N = Basic upgrade, popular with budget-minded modders, not serviceable, $
OE Bosch Sport 110 = MTM upgrade, same as 710N with "better" internals, not serviceable, $$
$ = under $50 USD
$$ = $50 - $150 USD
$$$ = Over $150 USD
3rd Gear
Joined: May 2003
Posts: 2,659
From: United States
RE: Blow off valve
ORIGINAL: ICE RCKT
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
So I'd have the same advice: Don't do it. Like I said above:
The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
1st Gear
Joined: May 2004
Posts: 8
RE: Blow off valve
ORIGINAL: imolas4
If I'm not mistaken the HKS CBV is a blow-off valve, too.
So I'd have the same advice: Don't do it. Like I said above:
ORIGINAL: ICE RCKT
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
So I'd have the same advice: Don't do it. Like I said above:
The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
3rd Gear
Joined: May 2003
Posts: 2,659
From: United States
RE: Blow off valve
ORIGINAL: ICE RCKT
The HKS Compressor Bypass Valve (I find it odd that this and other audi forums I've seen don't use this term, CBV? This is the terminology used by most aftermarket companies, and manufacturers as well. Regardless...) has a pop-open feature that opens the valve when it detects... well here http://www.hksusa.com/products/more.asp?id=761 .
ORIGINAL: imolas4
If I'm not mistaken the HKS CBV is a blow-off valve, too.
So I'd have the same advice: Don't do it. Like I said above:
ORIGINAL: ICE RCKT
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
So I'd have the same advice: Don't do it. Like I said above:
The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
For what the DV needs to do, I think the HKS is, at the very least, overkill. All the other DV's I mentioned above accomplish the task for far less money. It doesn't seem as though the HKS is going to do anything superior to what the others will do. The fact that the HKS valves "...incorporate an additional pressurized port to aid under severe boost conditions" is moot. And that it "...can also be used as a safety "pop-off" valve if the second port is connected to a pressure source that does not see vacuum" is an interesting "safety" feature, but, with the closed loop system of the Audi, it isn't necessary.
It sounds like a good investment for those systems that are experimental and/or are producing massive boost. Only the model #17670-006100 comes close to a useful unit with its psi rating of 12~18, but that's not an outrageously high range for an experimental/massive boost system.
The majority of the other DV's mentioned handle these numbers easily.
BTW: We all use DV, BPV, and BOV because, in fact, so many tuners and manufacturers are using the same terms. For me, this is the first time I have seen/read any info with the term CBV. I guess it doesn't really matter, as long as we all know what we're talking about. The only misconceptions I have seen are the misuse or typos with BOV instead of BPV.
1st Gear
Joined: May 2004
Posts: 8
RE: Blow off valve
ORIGINAL: imolas4
My first thought is... Damn! That's a lot of money for a DV! And you'll need two = $540!!!
For what the DV needs to do, I think the HKS is, at the very least, overkill. All the other DV's I mentioned above accomplish the task for far less money. It doesn't seem as though the HKS is going to do anything superior to what the others will do. The fact that the HKS valves "...incorporate an additional pressurized port to aid under severe boost conditions" is moot. And that it "...can also be used as a safety "pop-off" valve if the second port is connected to a pressure source that does not see vacuum" is an interesting "safety" feature, but, with the closed loop system of the Audi, it isn't necessary.
It sounds like a good investment for those systems that are experimental and/or are producing massive boost. Only the model #17670-006100 comes close to a useful unit with its psi rating of 12~18, but that's not an outrageously high range for an experimental/massive boost system.
The majority of the other DV's mentioned handle these numbers easily.
BTW: We all use DV, BPV, and BOV because, in fact, so many tuners and manufacturers are using the same terms. For me, this is the first time I have seen/read any info with the term CBV. I guess it doesn't really matter, as long as we all know what we're talking about. The only misconceptions I have seen are the misuse or typos with BOV instead of BPV.
ORIGINAL: ICE RCKT
The HKS Compressor Bypass Valve (I find it odd that this and other audi forums I've seen don't use this term, CBV? This is the terminology used by most aftermarket companies, and manufacturers as well. Regardless...) has a pop-open feature that opens the valve when it detects... well here http://www.hksusa.com/products/more.asp?id=761 .
ORIGINAL: imolas4
If I'm not mistaken the HKS CBV is a blow-off valve, too.
So I'd have the same advice: Don't do it. Like I said above:
ORIGINAL: ICE RCKT
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
Imolas4,
Any thoughts on the HKS Racing CBV?
Erik
So I'd have the same advice: Don't do it. Like I said above:
The Audi turbo system is a closed loop system and requires the excess boost to be diverted back into the loop.
For what the DV needs to do, I think the HKS is, at the very least, overkill. All the other DV's I mentioned above accomplish the task for far less money. It doesn't seem as though the HKS is going to do anything superior to what the others will do. The fact that the HKS valves "...incorporate an additional pressurized port to aid under severe boost conditions" is moot. And that it "...can also be used as a safety "pop-off" valve if the second port is connected to a pressure source that does not see vacuum" is an interesting "safety" feature, but, with the closed loop system of the Audi, it isn't necessary.
It sounds like a good investment for those systems that are experimental and/or are producing massive boost. Only the model #17670-006100 comes close to a useful unit with its psi rating of 12~18, but that's not an outrageously high range for an experimental/massive boost system.
The majority of the other DV's mentioned handle these numbers easily.
BTW: We all use DV, BPV, and BOV because, in fact, so many tuners and manufacturers are using the same terms. For me, this is the first time I have seen/read any info with the term CBV. I guess it doesn't really matter, as long as we all know what we're talking about. The only misconceptions I have seen are the misuse or typos with BOV instead of BPV.
3rd Gear
Joined: May 2003
Posts: 2,659
From: United States
RE: Blow off valve
Good luck, and let me know how it all turns out. I'm curious to know how it works with the early model S4. I don't get much dialogue going with guys who have URs4's. Always good to know the differences.
I wonder if its a Canadian vs USA thing - the whole CBV vs BPV terminology. Hmmmmm.
I wonder if its a Canadian vs USA thing - the whole CBV vs BPV terminology. Hmmmmm.
1st Gear
Joined: May 2004
Posts: 8
RE: Blow off valve
have a peek over at www.turbobricks.com . There's quite a wealth of turbo and fuel system upgrage knowledge, also a lot of info on MegaSquirt for those so inclined. There's a 1984 240 coupe running 13.6 @ 106 first time out after installing EMS, should be an interesting summer for him. There's also a huge thread about squish vs. swirl, an in-depth discussion on combustion chamber design... also for those so inclined...
Erik
Erik
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