Anybody upgrade their atmospheric dump valve/diverter valve?

[Sierra Audi]

Stumbled upon the Forge Motorsport valve and wondered if anybody has installed one? Does it make any difference other than noise?

[SHCKR]

Stumbled upon the Forge Motorsport valve and wondered if anybody has installed one? Does it make any difference other than noise?

Don't. Too many horror stories

[thehobbithouse]

Interested in this as well. I’m fairly certain I need a new Diverter Valve anyways… Was curious if the Forge was worth the money.

[Sierra Audi]

Was just doing some studying regarding these and most articles state that they are beneficial in if you are tuned with increased boost and experiencing flutter which I am. Curious as to why they might produce problems?

[kifac]

Yeah ive also heard stories of DV just causing issues.
Car doesnt seem to like it at all.
Its a hit or miss.

Some people run it fine and others just cant get it to work.

[Valentino S5]

Don't. Too many horror stories

What he said. That Forge valve is detrimental to the performance of our cars. Many of us went that way and regret to do it. The OEM recirculating valve is the best way to go, by far (even if you are tuned, it works perfect).

[Sierra Audi]

OK, so it sounds like it might not be a good idea but I’m still at a loss as to how it’s detrimental. I’m getting turbo flutter when I let off the throttle at higher rom’s and I’ve also read that isn’t good for the turbo. Just looking for a fix to alleviate the flutter

[Esmin23]

I still have my forge diverter on the car. With stage 2 tune. I haven’t had any issues whatsoever. But I do know that some have had issues. Not sure what’s the cause though!

[Sierra Audi]

I still have my forge diverter on the car. With stage 2 tune. I haven’t had any issues whatsoever. But I do know that some have had issues. Not sure what’s the cause though!

I read the thread regarding the increased IAT’s but that seems to have been remedied with the updated vacuum solenoid that Forge is including now. Still not sure what “problems” people have had with them? I ran the Forge on my old Jetta MKIV and had zero issues but I know the 3.0T is a different beast.

[Kondax]

The forge has failed on many cars. I've had two failures, both old and new design.
The weistec has caused CELs on many cars.
The ECS has caused CELs on many cars.

If you are stock turbo then there is a good chance you'll get away with the weistec or ECS spacer. You may have luck with the forge but there is a good chance it will fail. I have not got enough hands to count the amount of failures I know of.

If you are hybrid turbo then it is imperative you remain stock recirc valve otherwise you will run into CELs and drivetrain malfunctions. They are not designed for high boost, they aren't even designed for performance. They're designed to make a flutter noise, aka the noise your turbo will make when it stalls.

The stock recirc valve has held above 3 bar of boost without fail. For comparison, stock cars usually target 1.2 - 1.3 bar of boost. There is no reason to "upgrade", they are only downgrades. Unless you like the noise.

[SHCKR]

The forge has failed on many cars. I've had two failures, both old and new design.
The weistec has caused CELs on many cars.
The ECS has caused CELs on many cars.

If you are stock turbo then there is a good chance you'll get away with the weistec or ECS spacer. You may have luck with the forge but there is a good chance it will fail. I have not got enough hands to count the amount of failures I know of.

If you are hybrid turbo then it is imperative you remain stock recirc valve otherwise you will run into CELs and drivetrain malfunctions. They are not designed for high boost, they aren't even designed for performance. They're designed to make a flutter noise, aka the noise your turbo will make when it stalls.

The stock recirc valve has held above 3 bar of boost without fail. For comparison, stock cars usually target 1.2 - 1.3 bar of boost. There is no reason to "upgrade", they are only downgrades. Unless you like the noise.

Could you elaborate more on this turbo fluttering concept please? Ever since I've gutted my air box I've had this super weird flutter intake noise, along with amazing swishing sound lol, wondering if that's what I'm hearing.
It's just as I start to let off after heavy acceleration

[Sierra Audi]

The flutter I’m having sounds like a high pitched pulsing whistle. If you YouTube search “turbo flutter sound” all kinds of videos come up of the sound I’m hearing. I’ve read that it puts extra stress on the compression fan and can prematurely wear the turbo bearings which is why I’m searching for a fix. I would say unless you’re tuned and raising boost levels, the sound you’re hearing isn’t true turbo flutter but rather a byproduct of altering the intake box.

[SHCKR]

The flutter I’m having sounds like a high pitched pulsing whistle. If you YouTube search “turbo flutter sound” all kinds of videos come up of the sound I’m hearing. I’ve read that it puts extra stress on the compression fan and can prematurely wear the turbo bearings which is why I’m searching for a fix. I would say unless you’re tuned and raising boost levels, the sound you’re hearing isn’t true turbo flutter but rather a byproduct of altering the intake box.

Ha, you know I'm tuned, but I've never heard it before messing with the airbox... I plan on getting a GoPro one of these days and recording it

[Sierra Audi]

I’m going direct with 034 tomorrow regarding it. If they say it’s fine, then I’m all good.

[Kondax]

Yes, it wouldn't be something I'd worry about. You can look into turbo flutter / compressor stall to find more info. It's the reason BOVs exist

[waddupdgriff]

Just wanted to add, I've had my Forge dump valve on for a few weeks now and no issues or hiccups to report. 18 SQ5 with EPL Stg 1 93


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[DreamTFK]

I have the one installed from ECS and have never had issues with it. Noticeable sound difference. Carried it over from my 19 to B9.5 without issue.

[Sierra Audi]

Gents, been working with Brett over at Go Fast Bits in Australia. They are currently working a complete redesign of the diverter valve for the EA839 motor. Loose estimate on completion is this fall/winter. I’m still getting flutter during hard acceleration with quick lift off. Hoping the GFB valve will correct it. I’ll update this thread as I get info.

[justwantv]

Flame away for bumping an ancient thread but at least my search skills run deep...

So the post above talks about the GFB valve. I emailed GFB a bit ago and maybe I'll get a response maybe not. Maybe this is already exhausted somewhere else I didn't read.

The stock OEM part number for the valve on my SQ5 is 06M145710F. One certain Audi parts sites it says this part fits a slew of engines including the 3.0 as well as 2.0 4cyl. So if our stock valve can work on a 2.0 possibly the guts of the valves are the same and the GFB mod would would in our valve even though GFB doesn't list it that way. I'm thinking of buying one and seeing if it will work but have to make sure it is returnable. Anyone ever opened our diverter or tried modifying it with the GFB parts?

[FunkyTechnician]

I just purchased an S4 and have the GFB diverter valve on my A4, and it was noticeable in reducing perceived "turbo flutter," in my opinion, and seemed to actuate better than the stock part. Maybe I can test it out on the S4 at some point - but would be nice to get GFB's take on it first.

[S4James]

https://gfb.com.au/products/blow-off...ations-detail/ this is the page.

[initiala4]

https://gfb.com.au/products/blow-off...ations-detail/ this is the page.

I would check the pistons on the GFB as they dry up rather quick.

[FromS60toB61.8t]

If you're getting turbo flutter under high acceleration / high boost, there is another underlying issue. The only time your turbo should flutter is if you rapidly tap the accelerator just before it gets into boost now allowing for the DV to open up.
What most are probably hearing is just the intake sounds of a little bit of air being pushed back.

The only time you ever actually need a BOV is when running excess boost on a large turbo (which nobody is doing on stock turbo or TTE). Any other time a recirc valve / closed system is much more beneficial, especially on Audis which are designed to use that recirculated air. It's not as detrimental on the newer cars with the DV in the turbine housing as they have blow-through MAFs rather than the in-line intake MAFs, but there are no real benefits to it other than sounding JDM AF.

Also contrary to what some say on the interwebs, the flutter doesn't actually do much to the turbo. In my 15 years I've had 2 cars with excess flutter and they were a B6 A4 with 110k on the clock with the factory turbo and a 2.7 allroad with with 150k on the clock with both factory turbos still.

[AudioPAS4]

I updated mine to the newest version, stock audi. The .F version. But still getting it. I just want to make sure I'm not losing power from it. If there's something better or needed I'm all ears.

[Speedster00]

Me on the dyno, Stage 2 EPL, I was told this is normal flutter. Still wouldn't mind getting rid of it and getting louder blow off sounds

https://youtube.com/shorts/MRZWFxviZ...tFmh90H5O2Hx6S

[AudioPAS4]

Im stock turbo, once i check the code ill post it. odd how once i restart there no code.

[TunedB9S4]

Bumping an old thread.

This works ->

https://www.turbosmart.com/product/b...umb-back-vr18/

Bought this mainly because I've now had two failed OEM DVs. No other after-market has worked for me with an OTS tune (EPL / IE). This one functions as expected. My car is already loud AF so difficult to tell if it has any increased sound effects. It doesn't at low speed.

[sandman00]

Bumping an old thread.

This works ->

https://www.turbosmart.com/product/b...umb-back-vr18/

Bought this mainly because I've now had two failed OEM DVs. No other after-market has worked for me with an OTS tune (EPL / IE). This one functions as expected. My car is already loud AF so difficult to tell if it has any increased sound effects. It doesn't at low speed.

This is a great DV, better than stock. I have been using this one for a while now, first with the stock Turbo and then With the TTE710 and With the TTE810. No codes, better than stock, very reliable and sounds great too.


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[chrismadson]

This is a great DV, better than stock. I have been using this one for a while now, first with the stock Turbo and then With the TTE710 and With the TTE810. No codes, better than stock, very reliable and sounds great too.


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Other than potential failure, what do you mean by better than stock?


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[brandonbanana]

I had the diverter valve spacer and I can admit that it sounded gangster till I was leaking boost from that spacer lol

[Gunnarrrrr]

switching an audi from recirc to atmospheric dump is a level of heresy only second to mounting a set of te37’s or rpf1’s.

+1 on the turbosmart


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[S4James]

lol. i ran rpf1s on my b5. I got no end of flak from one particular local purist. They were fantastic looking wheels.

[Mr. Lin]

switching an audi from recirc to atmospheric dump is a level of heresy only second to mounting a set of te37’s or rpf1’s.

*goes to return set of Enkei sneakily

[Gunnarrrrr]

*goes to return set of Enkei sneakily

caught in 4k




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[handspin]

the turbosystems valve seems like a good upgrade, might do that

[S4James]

Bump, just installed a GFB T9380 and sure enough my throttle tip-in whistle noise SEEMS to have been mostly fixed. If I had to guess the stock light plastic piston was either not sealing to the machined surface, or simply putting out that high frequency resonance noise as air passed through the chamber. In any case the characteristic of the sound has shifted to a deeper note, and not as pronounced. Obviously with a bit turbo, and a big semi open intake like the IE one, more noise is just part of the game. But I found that particular sound really unpleasant.

I had the EXACT same issue with the stock plastic DVs on my old B5 when i went to K04s.. They made noise. They worked, but part throttle spin up with mild boost and the would hum, honk, make crappy sounds.. yuck. Heavy duty piston style DVs fixed it.

[QuickHandCam]

Bump, just installed a GFB T9380 and sure enough my throttle tip-in whistle noise SEEMS to have been mostly fixed. If I had to guess the stock light plastic piston was either not sealing to the machined surface, or simply putting out that high frequency resonance noise as air passed through the chamber. In any case the characteristic of the sound has shifted to a deeper note, and not as pronounced. Obviously with a bit turbo, and a big semi open intake like the IE one, more noise is just part of the game. But I found that particular sound really unpleasant.

I used a GFB DV+ on my old MK5 GTI and it worked really well, never had a problem, held boost, and made throttle feel better. Are you experiencing these same benefits going to this GFB DV replacement for OEM?
GFB DV is backed by a lifetime warranty. So I'm wondering if I should go this route or the TurboSmart DV mentioned above. Mostly going for performance, but if they both work well, then I would only be chasing sound differences as they're priced very similarly.

[S4James]

Well its a very subjective sort of thing isnt it.. I mean it might be better, but nothing night and day.

[A4 Centaur]

Used a GFB DV on my B8 2.0. Wound up pulling it off after a few thousand miles due to its apparent ineffectiveness. Went back to an OEM Revision "D" and it's been fine.

Not sure I would spend my money on one for my S4.

[S4James]

I had a gfb hybrid adjustable valve for my 1.8t, it was a work of art, but it absolutely did not work on that car at all. The gfb valve i got is a simple DV, no hybrid nonsense. I cant imagine it not working.