My diverter valve relocation. PICS

[J-jizzle]

A few weeks ago some people were asking for pics on doing this. Here is an old thread I found.
http://www.audizine.com/forum/showth...ght=relocation

Although I did mine much like this I wanted to still use the stock pipe that connects the IC to the Throttle Body and the stock TIP.

So I called Forge to get a 50mm T fitting and for the rest I went to Advanced Auto Parts and Lowes to get what I thought I might need.

I didnt use all of this I just got more so I didnt have to make another trip. I did not use the extra vac-hose, the 90degree fitting or the extra straight fitting.


So with everything together I took off the pipe from the IC to the Throttle Body and cut it in half, and installed the T-fitting.

You can leave it like this or cut a extra hole so it looks and fits alot better.




Next I took the radiator hoses I chose and cut them the way I wanted, to make everything fit right.






Everything went smoothly and was very easy. If your planing to do this all you really need is the T-fitting from Forge($40shipped), a few radiator hoses of your choice(about 20$), hose clamps, a pvc plug for the old DV spot, and a pvc connector fittings. I did not need any extra vac-hose cause the stock line was plenty long.....Hope this was helpful to anyone wanting to do this or still unclear about it.


Here is a questoin I have though. I want to disconncet my 007 from the return hose that goes to the TIP to see how it sounds. I guess Ill throw a code, but when I get done riding around for a min and plug it back in will the code go away or will I need to clear it myself.

[AudiA4Turbo22]

^^ looks real good! i might consider it!

[eg6siR]

you might have to clear it...

[A4donkey]

any performance deviation after such mod?

[Killerteve]

What is the reason for relocating the DV?

[FireWire]

^^ vroom psssh vroom psssh more audible i suppose. great idea though , it'll make changing out your DV a whole lot easier.

[A4TL]

would this cause surging found in the transverse 1.8T or reduce it?

the 1.8T transverse has distance issues (due to space). by reducing the n75 to manifold to dv braided line you would decrease the possibility of surging. (fact)

but would moving the DV itself alter anything ?

has to do with the reaction time of the physical (tubing) and the closed loop electrical (ecu to n75) yes?

when i had turbo vw i found boost controller needed to be close as possible without meltdown (manifold/turbo heat) to get best response (less spiking or surging).

i'd like to see logs of demand/actual compared to a comparable car that has stock location to see the true effects if possible.

[A4ringedONE8T]

Yea I wouldnt do that ...

Think about the purpose of a pressure relief valve (DV, bov)! Its to remove air from the charge pipe AT THE TURBO to prevent surge or cavitation of the turbo wheel. If you move the DV to the other side your taking it as far from the turbo as possible. When that thing opens now all its clearing out is the throttle body hose and possibly part of the IC, if you have a FMIC it definitely is NOT helping the turbo but hurting it. Where you put it is the worst place possible. There is a reason Audi engineers put it that close to the turbo, THATS WHERE IT NEEDS TO BE!

[Pat@Forge]

The pressure spike begins when the charge air slams against the closed throttle body. The wave will then travel back towards the turbo and there will be another spike as it meets with the spinning compressor wheel. If the initial shock from the TB can be vented before traveling back to the comp wheel then this works perfectly.

[J-jizzle]

^^ vroom psssh vroom psssh more audible i suppose. great idea though , it'll make changing out your DV a whole lot easier.

Moving it here did not make anydifference in sound. actualy I think it is a lil more quite then my prevous location. Other than that I cant tell much of anything it the performance field. But atleast im blowing cool air on my turbo instead of hot.

[J-jizzle]

Yea I wouldnt do that ...

Think about the purpose of a pressure relief valve (DV, bov)! Its to remove air from the charge pipe AT THE TURBO to prevent surge or cavitation of the turbo wheel. If you move the DV to the other side your taking it as far from the turbo as possible. When that thing opens now all its clearing out is the throttle body hose and possibly part of the IC, if you have a FMIC it definitely is NOT helping the turbo but hurting it. Where you put it is the worst place possible. There is a reason Audi engineers put it that close to the turbo, THATS WHERE IT NEEDS TO BE!

This is the first time I have heard this. My understanding was more like Pat@forge.

[A4 KiDD 810]

well thats a convenient location, even though according to a4 ringed it may not be the best in terms of engineering i guess is the word.

[redflagquattro]

Yea I wouldnt do that ...

Think about the purpose of a pressure relief valve (DV, bov)! Its to remove air from the charge pipe AT THE TURBO to prevent surge or cavitation of the turbo wheel. If you move the DV to the other side your taking it as far from the turbo as possible. When that thing opens now all its clearing out is the throttle body hose and possibly part of the IC, if you have a FMIC it definitely is NOT helping the turbo but hurting it. Where you put it is the worst place possible. There is a reason Audi engineers put it that close to the turbo, THATS WHERE IT NEEDS TO BE!

I somewhat understand the point you are trying to make..but it is not completely applicable.

Think about it like this: with the stock setup of the dv, when the throttle plate shuts, the air inside of the system must now travel in the opposite direction down the plummbing, back through the intercooler, and then through steel pipe again before it finally hits the dv to get released..not very efficient if you ask me. With the dv located on the cold side of the system before the throttle plate, the second the plate shuts the air is released through the valve without having to make a reverse direction in flow, and obviously a much shorter distance to the valve itself. Audi set the valve up the way they did for stock boost pressure..with an immense increase in pressure like on chipped or BT cars.. theoretically this is a much more efficient setup.

[Molotov]

GRAVE DIGGER.. back from the dead.

[B6Lovin]

no kidding. i was about to reply and rip this wide open too lmao.

[dirtybrd]

Being released right before the TB is better, it removes most of the shock for the most and any that's left over will have to travel from the valve all the way back to the turbo. Also the IC will help deminish the rest of it.

[7speed]

but he kinda makes sense though

[yung turbo]

are there any gains to this method tho?

[jmw241]

guessing not ^

[JoshDub]

How many times can this thread be necro bumped?

[diagnosticator]

How many times can this thread be necro bumped?

It has a lot of life in it yet...

[pape]

The best place for the BOV / Diverter is just before the throtle body. This is a known fact. If any of you see a HPF 1000hp stage4 M3 you will see the BOV on the intake manifold. (individual Throttle bodies) when your at 1000HP everything in the system is exacly were it needs to be....

[jmw241]

How many times can this thread be necro bumped?

As long as the information in it is sill relevant and can be discussed further?!?

[doublezero30]

i dont know what i like more...the fact that the install is clean, or the fact that i now know of someone else who drinks moosehead!! haha did you get any of the coaster bottle openers when they were putting them in the 12packs?

[Audi_Nubi]

Being released right before the TB is better, it removes most of the shock for the most and any that's left over will have to travel from the valve all the way back to the turbo. Also the IC will help deminish the rest of it.

IIRC...having the DV close to the TB should allow for quicker spooling between shifts. During shifting, there will be some boost pressure between the turbo and DV. So assume your DV is just before the TB, you shift gears, the DV closes and TB opens, all that residual PSI is now available.

[diagnosticator]

On stock setups, I think the reason the DV is located so far from the TB, is mainly a bean counting factor deciding. Since the difference on stock setups is not as large as on higher boost level setups. Everything is a compromise between technical merit and cost of manufacturing.

[dougyfresh]

On stock setups, I think the reason the DV is located so far from the TB, is mainly a bean counting factor deciding. Since the difference on stock setups is not as large as on higher boost level setups. Everything is a compromise between technical merit and cost of manufacturing.

Mine is a few inches from my throttle body. But I'm not running a stock turbo. Re-routed through the factory cross-over charge pipe in the radiator support (utilizing now wasted space since I have a FMIC) and then into my TIP.