FAQ: All your Blow Off Valve & Diverter Valve / By-Pass Valve Questions!

[S-Power]

i switched from the regular forge dv's to the to the splitters and i like them alot.

Get a video of this, I always wondered how our cars would sound with BOV's

[AWD87]

There are a few videos of the forge splitter on 1.8t's. They don't seem too noticibly loud in my opinion. That might only be due to bad camera sound quality though.

[Jung]

they sound like every other car with a BOV. splitters are quiet. that's the end of the story. they're not loud.

[csre9]

I just want to know which way to run
Evo ms dv's? Haha

[lsc2g]

i just ordered 2 hyperboost DVs to replace my failed 710ns..

called strat and they gave me a wicked discount right over the phone!

awesome sales team!

[xtort44]

These seem pretty cool

http://www.eurojetracing.com/Product...0&Redirected=Y

[AWD87]

now that I think about it, wouldn't running splitters be somewhat equivalent to a torn tbb with all the un-monitored air being let out?

[S4 BOOST]

These seem pretty cool

http://www.eurojetracing.com/Product...0&Redirected=Y

Hawt

[rsxsty1e]

looking into getting the 710n's - do the bosch or oem perform better/last longer, or is there little to no difference between the two

[Yesmar]

if your almost sure you have bad dv,(stock) when i change them should i also replace the hoses conecting them?

[AudiSportB5S4]

looking into getting the 710n's - do the bosch or oem perform better/last longer, or is there little to no difference between the two

HAHA come on, really. Go to the "search this thread" tool and type in "710N". Read your results.

[AudiSportB5S4]

if your almost sure you have bad dv,(stock) when i change them should i also replace the hoses conecting them?

The Upper intake hoses that you are referring to never go bad, usually people do them (like I did) for aesthetic reasons only. The only issue around that area is the TBB besides the stock DVs tearing with increased boost levels.

[AudiSportB5S4]

i just ordered 2 hyperboost DVs to replace my failed 710ns..

called strat and they gave me a wicked discount right over the phone!

awesome sales team!

X2. I've had my Hyperboost valves for over 2 years and they have been through stage 1, 2, and now 3 for the past 1.5 years. Great valve and customer service too. They come to Waterfest and offer discounts on those valves usually.

[Adie89]

The guy who tuned my car ( Search for MRC S4 on Youtube) is running around 570bhp and he still uses stock RS4 Diverter valves. The metal ones have a tendency to stick because it's metal to metal contact.
Just to add to the debate on BOV's the point raised about MAF sensor location and dumping metered air, is it really worth the extra hassle just for a little whoosh?

[mufflerman]

Just did the 710N's purely as a preventative maintanence thing, world of difference. The stock ones were still working, that is opening under decel to recirculate the boost, but apparently they were also opening and leaking off under boost conditions as well. Now my car makes consistant power under all conditions. The old ones were very easy to push open, and the 710N's had a lot more resistance. I don't know if this was because mine were original to the car (73K miles) and worn out or if the new parts just have more resistance, but for around $100, everyone should do this.

[sempaipaul]

backwords diverter valves?!

--------------------------------------------------------------------------------

what's the rumor, I searched, but cant relally find anything....

people flipping over hyperboost and other dv's to get the sound...

Anyone do this? any clips? any pro's con's...

-Paul

[kevin8086]

i know this is my first post but i am buying an S4 and i use to have one a few years back while i worked at Achtuning. i used forged 007 but they were VTA BOV's and for some reason i never had a problem with them. car ran fine at idle and between shifts. i still have them and it's been like 5 years. i plan on putting them on my S4 that i am purchasing. oh and it was with a stage 3 kit.

[S-Power]

If you re-circulate them right, it can run fine.

[jdubyapepper]

I have a sneaking suspicion that my driver side Bailey DV is bad. I'm getting some oil splatter around it and my car is acting funny at higher boost. I'm getting a code saying that I'm running rich. Anyone else think that my DV might be bad? They're pretty old....At least 5 years.

[GeneseeS4]

Do the 710N's ever need replacing? Are they replaced every so often? Is there a way to test them?

[B5tard]

they are not good valves.

[Trigger Happy]

So I have the samco DV's and I really like them, but I was wondering if they ever need to be serviced or lubricated? And am I correct in thinking that all I have to do is unscrew the top, pull the guts out, clean it, grease the outside of the diafram, and put it back together?

[mark001]

I got a quick question. Please don't flame. I recently upgraded to a stage 3 setup. I still need to upgrade my stocker DVs. I was thinking of going with dual Greddy Type-S. However, they will be recirculated of course. Will I run into issues running them this way as opposed to running Diverters? I've always loved that bov. In fact, I've used it on all my previous turbocharged cars.
The reason I'm considering going with the Type S's on the S4 is because I'm getting a hell of a deal on the set. What do you guys think?

[GLIDN]

not sure why everyone has such a gripe with the Audi S3 710N valves?

I have used them in all my past golfs and Audi's. One of my golfs ran 22psi for almost 90,000miles and 7 years. The DV was still perfect and holding boost exactly as it should.

[ptatohed]

Sorry if this is a repeat post:

DV Testing Part 1: http://www.s4biturbo.com/art-dvtests.php

DV Testing Part 2: http://www.s4biturbo.com/art-dvtests2.php

(from here: http://www.s4biturbo.com/)

[A4zombie]

I'd like to put in my 2 cents... First off there is no "rich codes" with a bov , secountly I bet that happens cause retards don't eliminate the cow bell boost res AND plug up proporly the holes and hoses to the TIP ... Guys when your idling your valve is closed and you are not boosting and the ONLY reason you have a dv is for noise regulations...the truth is that blowoff of pressure actully dosent do shit cause your engine IS in vacume not spooling the turbo so scientifically the MAF isn't account blow off boost cause it wouldn't put it into the engine for use unless your butterfly is open... Comes from a guy running a fully atmosphere iv bov btw hope this answers all the questions

[rs4treter]

i drive the baileys dv26d double piston valve for bearly 6 years now. drove my rs stock with them and withall my modifivations. works fine, no faultcode entry, no cel, no problems with idle or full rev. compared to the stock rs dv and the s3 dv there's no difference except less money for audi and sound from the dv26d. think most guys with problems on their bovs are running single piston valves. our cars need doublepiston to work

[TwistedX]

Holy thread revival warning. Feel free to flame, I've got my suit on. So we can't use BOV(I know ricer) because the DC is located after the maf, if someone were doing an engine out rebuild could they run BOVs if they relocate them to before the maf? If so what would that entail?

[Cysco abt S4]

this is all the input i have...
http://www.youtube.com/watch?v=VbNxu...elated&search=

even though i don't mind BOVs in general, this is hilarious! lol =]

Hahahahaha

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[chaos2984]

Holy thread revival warning. Feel free to flame, I've got my suit on. So we can't use BOV(I know ricer) because the DC is located after the maf, if someone were doing an engine out rebuild could they run BOVs if they relocate them to before the maf? If so what would that entail?

I know this is an old post. But no because all the air that goes though the turbo is metered air. Honestly if your looking for the bov noise just run one 50/50 DV valve. I ran that for awhile on my old S4 and never had any issues or shift issues. I was only blowing off 25% of the actual metered air and Recircing 75% of the air. I ran a full DV valve on one side and a 50/50 split on one side. Which blows off 50% of the air and recirc's 50% of the air. So since its one side its only 25% of the air that you are dumping out to the atmosphere its not going to matter much.

[vondrasek]

This might be a silly question but I think one of my DVs went out because off throttle it’ll make turbo flutter (Stu Stu Stu Stu noise), and I’m wondering what exactly would cause that and if I could delete the DV setup. I like the turbo flutter noise and I’ve used it to make a few people back down from trying to race me because they thought I was making north of 600.


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