How BPV's are supposed to be positioned

[Saturnine]

There has been alot of talk about the proper orientation of the BPV's on our cars.. So here's a picture (not of an audi, but same ideal) of how it should be installed.



Please note that the BOTTOM of the valve should be placed into the pressurized IC hose (the side opposite of the Vac line fitting) and not the other way around.

The pistion in most BPV's moves vertically (Red arrows) so when the valve does its thing, the air pushes the valve up and lets the air go out via the outlet on the side of the bpv (purple arrow) which in turn is rerouted back into the intake track..

Hope this helps out with some of the confusion

[fongaroos]

thats strange...

in this picture the vac line is positioned the other way...

http://forums.audiworld.com/a4gen2/msgs/270452.phtml

[Saturnine]

Yea, i realize that but that doesnt make any sense to put the valve that way.

[Silence]

That is because that is the STOCK configuration. Vacuum line should always be facing up with the Forge valves.. It's quite simple actually.

[Saturnine]

Why yes it is sir

I mean seriously, why would any Audi engineer run the valve in the "stock" position? Thats like trying to fit a square block into a round

[fongaroos]

then why does it come like that from the factory?

in my mind i was thinking the same thing. of course you would want the boost to PUSH OPEN the piston in order to recirculate the air...

but when you get it from the factory...why is it NOT that way? that doesnt make a lot of sense...

[Saturnine]

Beats me.

[fongaroos]

so does that mean that all A4s should actually go get their DVs installed the other way around?

[Saturnine]

I believe so.

[bbaudi382]

no. wheres that huge DV article? the guy tested 6-7 DVs and figured out which ones work best which way. he found out that stock valves (710, 710n, 110 sport) all work better when installed "stock" way.

then some aftermarket valves work better when installed reverse of stock.

[fongaroos]

you mean mistertam?

[Saturnine]

Find the article sir!!

Originally posted by bbaudi382
no. wheres that huge DV article? the guy tested 6-7 DVs and figured out which ones work best which way. he found out that stock valves (710, 710n, 110 sport) all work better when installed "stock" way.

then some aftermarket valves work better when installed reverse of stock.

[fongaroos]

http://dv.mistertam.com/

[bbaudi382]

yep...more specifically...

http://dv.mistertam.com/7.htm

[Saturnine]

Hmm.. thats really interesting.

I still dont see how putting the bpv in the "proper way" (ie backwards) could produce better results.

The baileys is the only valve that worked really well (according to this guy) in the OEM position.. all the others are positioned in the manor that i described in this post..

[JeeprageII]

Originally posted by fongaroos
http://dv.mistertam.com/

I just read this post, thinking my Forge DV was the wrong way... changed it around, and it feels like @$$. I dont know if I was right all along/or mental, or if some of you are whacked.

I have the vacume line aiming up right now, and I think its 100% wrong. Aiming the Forge 007 the same way as stock felt a lot better. The car feels like it has no 3rd gear anymore with it reversed. Someone please confirm that I just reversed it, please.

I'm waiting for the car to cool to put it back to the way it was.

[dukez]

I've installed mines backwards once, there was no difference in performance. I swapped it.

Actually, know i dont know if mines right or wrong. Eh, theres no difference.

[Saturnine]

Can you take a pic?

Originally posted by JeeprageII
I just read this post, thinking my Forge DV was the wrong way... changed it around, and it feels like @$$. I dont know if I was right all along/or mental, or if some of you are whacked.

I have the vacume line aiming up right now, and I think its 100% wrong. Aiming the Forge 007 the same way as stock felt a lot better. The car feels like it has no 3rd gear anymore with it reversed. Someone please confirm that I just reversed it, please.

I'm waiting for the car to cool to put it back to the way it was.

[JeeprageII]

Here is a picture diagram...

Its too dark out to get my camera to work....

picture of DV

[fongaroos]

ARGH!!!

now this just confuses me more...

in my mind... it makes sense to install ALL DVs BOVs and anything in between OPPOSITE of the OEM orientation. it seems like that the release mechanism would work the best if the charged air is PUSHING the release open.

if you install it the OEM ORIENTATION then the release mechanism is relying solely on the vac line to PULL the release open.

ive only installed my forge one way. i had it installed the according to the OEM ORIENTATION. it felt perfectly fine... but then again... for all i know i could have been losing a lot of power but installing it that way.

in theory i agree with sat. OPPOSITE OF OEM ORIENTATION seems most logical.

but in practice... people are saying ALL SORTS OF STUFF...

[JeeprageII]

I say leave it stock way... its like that for a reason.

I don't know how/why people can argue otherwise, but my car feels pretty sluggish right now.

[Saturnine]

This is how its installed, and its sluggish?

Originally posted by JeeprageII
Here is a picture diagram...

Its too dark out to get my camera to work....

picture of DV

[JeeprageII]

Originally posted by Saturnine
This is how its installed, and its sluggish?

Yeah, just put it back to stock, feels a lot better to me. 3rd gear just felt like it had nothing reversed. I'm now a believer in stock for sure. I hope to never touch that DV again. Not the easiest swap at 10 at night with just a flashlight.

Time for a jog.

[Saturnine]

Damn, thats weird.

[Saturnine]

It appears that the Forge bpv's perform better intalled in the OEM orientation..

This is all so werid

[imajn34]

So what should I do? When it was installed the turbo lag disappeared and I noticed the positive difference. Should I reverse it and compare? I have ramps, how long will the job take. This is how it is now

[fongaroos]

hey sat... i think we opened up a can of worms...this sucks!!!

[Saturnine]

Yea man, my head hurts

[bbaudi382]

FWIW, my bosche 110 sport feels great, installed in the OEM way. however i did this as the same time as my snub mount. not too sure how MUCH difference it makes but it feels like the powerband is much smoother after the 110 and snub mount together...

[fongaroos]

Originally posted by Saturnine
Yea man, my head hurts

well fwiw... ive been contacting GFB

and they said that the GFB hybrid and stealth fx DEFINITELY need to be installed according to REVERSE ORIENTATION. they said that if installed OEM ORIENTATION the DV would flutter... and they were right on...

[npb]

All I have to say to this is wow... I still feel like this issue hasn't been resolved and we need to come to more conclusive evidence and proof that the Forge and other DV's work better in the OEM or reverse positions.

The OEM DV's operate by the vaccum pulling open the diaphragm- they also hold about 1/2 (?) as much boost as an aftermarket DV. If an aftermarket DV was installed in the stock position, and since the aftermarket DV's can hold twice as much boost as the stock, how good would this be for the engine if there had to be twice as much vacuum to open up the piston. And vice versa if the DV were installed in reverse position... etc etc.


sorry if this is incoherent or stupid...makes sense to me

[fongaroos]

Originally posted by npb
All I have to say to this is wow... I still feel like this issue hasn't been resolved and we need to come to more conclusive evidence and proof that the Forge and other DV's work better in the OEM or reverse positions.

The OEM DV's operate by the vaccum pulling open the diaphragm- they also hold about 1/2 (?) as much boost as an aftermarket DV. If an aftermarket DV was installed in the stock position, and since the aftermarket DV's can hold twice as much boost as the stock, how good would this be for the engine if there had to be twice as much vacuum to open up the piston. And vice versa if the DV were installed in reverse position... etc etc.


sorry if this is incoherent or stupid...makes sense to me

it makes complete sense to me... and that thought crossed my mind too...

[JMG]

Originally posted by npb
All I have to say to this is wow... I still feel like this issue hasn't been resolved and we need to come to more conclusive evidence and proof that the Forge and other DV's work better in the OEM or reverse positions.

The OEM DV's operate by the vaccum pulling open the diaphragm- they also hold about 1/2 (?) as much boost as an aftermarket DV. If an aftermarket DV was installed in the stock position, and since the aftermarket DV's can hold twice as much boost as the stock, how good would this be for the engine if there had to be twice as much vacuum to open up the piston. And vice versa if the DV were installed in reverse position... etc etc.


sorry if this is incoherent or stupid...makes sense to me

It doesn't need twice as much vaccume. Your talkign about a DV that makes up less than 5% the total air volume of the system. Also the vac from the line is being helped by the pressure that is still in the IC hose. One is pushing and one is pulling, so they work together. The wooooosh you hear in BOVs is that pressure from the IC hose getting out.

The ONLY reason your are installing a BPV in reverse is to provide the greatest resistance to the boost side (IC hose side) so that the boost is not leaked back into the intake return by accident. This also alows the valve to close sooner and therefore is supposted to improve boost recovery.