(MUST SEE!!!) For Those With A GFB DV+

[Alex1188]

For those with a GFB DV+ installed....

Well today was cruising around and noticed...what the hell no boost, and slow response. Well i thought my DV would have been solid after installing the DV+...think again...

After my troubleshooting lead me to the DV, i popped it off and notice two things...

1: The rubber o-ring at the tip of the DV+ plugger was badly worn.
IMG_20160612_141120.jpg

2: Most importantly, the DV+ housing was crack and a piece was broken off...
IMG_20160612_153527.jpg

Just goes to show there is no full proof fix for the DV issue. I have had this product since the initial release of it and has been installed for about 30k. I have sent GFB and email showing them this as well seeing if i can get a replacement will update this thread with my findings.

[dbv2]

Very interesting.. I will be subscribed to this thread.

I sell the DV+ locally. I have had no complaints, just installed it to my car last night as well. Couldn't have been happier.

But they are to be serviced every so often, brass piston to be re oiled, springs to be checked, etc..

I have one customer of mine install, and within 18 hours said the o ring on the plunger was torn, now that could have been install error, but could now be a poor quality o ring. Never the less the o ring size is 6x1.9 mm you can get one for cents at a industrial hardware store. As for the cracked housing, I'd like to see what your brass piston looks like to see if there is scoring on the piston. If there is, probably the scoring lead to the hosing crack.

[Alex1188]

As for the cracked housing, I'd like to see what your brass piston looks like to see if there is scoring on the piston. If there is, probably the scoring lead to the hosing crack.

Very minimal wear marks on the brass plunger. I don't see how the brass plunger would have any affect on the area that is cracked off...?

To me, it seems to be possibly a machining defect or possibly design error. Like I said I've had this part since the launch of it and have quiet a few miles on it. 30k+. That area is super thin, like the thickness of a small washer.

[dbv2]

Well the brass piston is what is moving up and down in that area that the broken piece is from..

But like I said, these things are meant to be serviced every so often. 30k plus miles, I'm sure you should have serviced it. The brass piston is to be lubed with oil or grease, its constantly moving in that area your housing is broken in.. So yes its related lol.

http://www.golfmk6.com/forums/showthread.php?t=91821

That's several user reviews of the DV+ on VW's, same T9351, they're discussing mainly if the main spring is to be used or not, but a lot of reviews of the overall impression. A few people running them for couple years and more miles than you, and many of them have serviced the DV+ and re lubed.

[b6Hate4]

Case busted wide open! Good work!

[Alex1188]

Well the brass piston is what is moving up and down in that area that the broken piece is from..

But like I said, these things are meant to be serviced every so often. 30k plus miles, I'm sure you should have serviced it. The brass piston is to be lubed with oil or grease, its constantly moving in that area your housing is broken in.. So yes its related lol.

http://www.golfmk6.com/forums/showthread.php?t=91821

That's several user reviews of the DV+ on VW's, same T9351, they're discussing mainly if the main spring is to be used or not, but a lot of reviews of the overall impression. A few people running them for couple years and more miles than you, and many of them have serviced the DV+ and re lubed.

For one yes I have serviced this part multiple times or relubed, what ever you want to say...

The piece that is broken is the housing, and specifically where the little black plug slides into. The brass plunger has no contact with any part of what broke, so I don't see how you say that would have any affect on it.

[dbv2]

Actually I'm not wrong.. I just opened up two T9356/9357 and the 9351 that I have in stock and all of them have that black nub part inside the housing where yours is slightly broken off.

All three of the the spring goes in the piston then on inside the housing on top of that broken nub that you have there. So it seems as if the piston crashed too many times into that part for whatever reason and caused it to break.

Yes the piston had contact with that part. The plunger's o ring is something else



The black plunger where the o ring on yours is shot doesn't go where the piece is broken.

[dbv2]

The only thing the black plunger slides into or onto is the factory solenoid coil. The only thing that can make contact with what you're showing that is broken is the brass piston. You installed that wrong.






I have no clue why you're saying the brass piston wouldn't have anything to do with the damage. The black plunger isn't even installed in that area where the damage is... This ins't a design error, you fucked up.

[lettuce]

The only thing the black plunger slides into or onto is the factory solenoid coil. The only thing that can make contact with what you're showing that is broken is the brass piston. You installed that wrong.






I have no clue why you're saying the brass piston wouldn't have anything to do with the damage. The black plunger isn't even installed in that area where the damage is... This ins't a design error, you fucked up.

What you're saying doesn't seem to be matching up with the pictures you're showing or my experiences with installing this DV+ myself. Maybe there's a bit of confusion between you two as to what you're both referring to in regards to the piston and plunger?

The brass piston (metallic gold piece with the orange rubber top) is the part which the instructions say to oil, and never comes into contact with the part OP broke. The black plunger is the piece with the small o-ring in OP's picture that comes into contact with the piece of the DV+ housing that he broke. It is never specified in the instructions to lubricate this part, as it doesn't slide against anything. The only contact this part has is with the factory solenoid, and the part that broke off. See the following cutaway diagram:



(taken from this video at around the 1:08 mark (the whole video is a good watch though):



Just by going off what I'm seeing here, it looks like there was a failure with the rubber o-ring on the black plunger (completely irrespective of the brass piston). And since it seems like this o-ring not only acts as a means to seal off the underside chamber of the piston from air pressure, but also to cushion the black plunger from its contact with the part OP broke, I would hazard a guess that the lack of cushioning could certainly lead to a breakage like this, since you will now be experiencing un-softened metal-on-metal contact.

Again just going off the information I'm seeing here, it could very well be a one-off issue, but I wouldn't go around telling anyone they 'fucked up'. Especially considering he put 30k miles on this part without issue. It looks to me like this o-ring should be considered a wear item, and be replaced during servicing while relubing the brass piston.

[Alex1188]

The only thing the black plunger slides into or onto is the factory solenoid coil.

No that is wrong... the black plunger does slide onto the factory solenoid correct. but the tip of the plunger slides into the back side of the DV+ housing, this is what holds the boost pressure not the brass plunger.

The only thing that can make contact with what you're showing that is broken is the brass piston. You installed that wrong.

Again incorrrect im showing the center of the housing has broken. the part where the black plunger slides into.
IMG_20160612_222636.jpg
IMG_20160612_222645.jpg
IMG_20160612_222907.jpg
IMG_20160612_222936.jpg

I have no clue why you're saying the brass piston wouldn't have anything to do with the damage. The black plunger isn't even installed in that area where the damage is...

Again the brass plunger cannot come into contact with this piece. The plunger is 11/16 of an inch deep at its shallowest, the DV+ housing is 53/64 of an inch, there is no way for the Brass plunger to come into contact with the center base of the DV+ housing. Also so you know for you future customers, the brass plunger is not what holds the boost pressure, the black plunger with the rubber o-ring is. The Brass plug is a passage block and the spring is there it assist in faster response times, hence why some VW GTI guys are saying they run with or without the springs...

This ins't a design error, you fucked up.

^^^
And this wasnt needed remind me to never buy something from you.

[Alex1188]

Just to be 100% accurate for this threads purposes, i installed this item in September 2013 my car had 61,647 Miles on it.... i now have 110,353 Miles....Thats 48,706 miles on this DV+.

[Slick_B8]

Just let the other dude be, alex. He doesnt want to lose any sales lmao thanks for the heads up btw

[dbv2]

My plunger doesn't slide into that hole so im very confused.

[dbv2]

im very confused as to how the area where the brass piston is that you're showing in the pictures has the damage but the plunger is installed on the other side where the coil is. On my DV+ the plunger doesn't fit into the flip side all the way. Just the tip where it closes of the pressure using the o ring.

[dbv2]

Ah sorry I see it now....

[NRigs]

I think I am around 20 or 25k on my DV+ by now, no issues.
I have installed 2 others on friends' cars and no issues for them either.
Maybe you received a faulty DV+?

[The Infiltrator]

No issues here... yet.

[blbroo]

GFB updated the DV+ at one point because the first design caused boost leak. The revision has a smaller o-ring and stronger spring, so that the seal is tighter. (the o-ring goes on the tip of the black plunger and seals the hole on the part that broke off on OPs unit, and the stronger spring makes it hit that area harder) I installed an old version and couldn't get above 15 psi and had it replaced with a revision. The revised unit holds the same boost as my stock DV, but doesn't perform any better. For our cars, if you have the D revision OEM diverter valve, I don't see any benefit in swapping it out with the DV+. Have had mine on and off the car four times now and see no benefit to it. It was helpful for VW cars before they improved the diverter valve design.

That said, if anyone wants a DV for $100, I'll ship my barely used one to them. I paid $134 for it on amazon.

[B44]

GFB updated the DV+ at one point because the first design caused boost leak. The revision has a smaller o-ring and stronger spring, so that the seal is tighter. (the o-ring goes on the tip of the black plunger and seals the hole on the part that broke off on OPs unit, and the stronger spring makes it hit that area harder) I installed an old version and couldn't get above 15 psi and had it replaced with a revision. The revised unit holds the same boost as my stock DV, but doesn't perform any better. For our cars, if you have the D revision OEM diverter valve, I don't see any benefit in swapping it out with the DV+. Have had mine on and off the car four times now and see no benefit to it. It was helpful for VW cars before they improved the diverter valve design.

That said, if anyone wants a DV for $100, I'll ship my barely used one to them. I paid $134 for it on amazon.

I have question so does this mean my forge dv is I had previously better than this dv+ i still have the forge so I can swap it back? Thanks

[blbroo]

I have question so does this mean my forge dv is I had previously better than this dv+ i still have the forge so I can swap it back? Thanks

Sorry man, I don't know much about the Forge DV. looks like the Forge unit is a complete replacement, while the DV+ is just an add on to the stock diverter valve with some parts swapped.

[Alex1188]

UPDATE:

Got an email back from GFB (Go Fast Bits), was told their engineering team is looking into this and that this is the first time they have seen anything like this.

Will post more when I hear back.

[Alex1188]

FINAL UPDATE:

This is the final email straight from GFB...

"You are correct in that our product was designed to be a replacement for the OEM valve. This should not have happened, we have seen this happen only once before in Germany. It looks like the o ring has failed then caused the other problem.



We will arrange to ship you another one from our distributor in the USA immediately to your address below. Sorry for the inconvenience this has caused."

So looks like I shall be receiving a replacement, and that this should be an pretty isolated issue. GFB was very quick and responsive on this issue. And I shall hopefully be running this product for a lot longer.

[prasamin]

I wanted to bring this back up. I received my GFB DV+, and I'm wondering how you can tell if you got the updated version with the stiffer spring and stronger o-ring? All of the pictures I see have an orange o-ring on the plunger. The unit I received has a black o-ring on it. I don't want to install this thing unless I have the updated version from GFB. Any info on this?

[Nano909]

I wanted to bring this back up. I received my GFB DV+, and I'm wondering how you can tell if you got the updated version with the stiffer spring and stronger o-ring? All of the pictures I see have an orange o-ring on the plunger. The unit I received has a black o-ring on it. I don't want to install this thing unless I have the updated version from GFB. Any info on this?

Contact GFB directly and ask.

[Steelerhater37]

The only thing the black plunger slides into or onto is the factory solenoid coil. The only thing that can make contact with what you're showing that is broken is the brass piston. You installed that wrong.






I have no clue why you're saying the brass piston wouldn't have anything to do with the damage. The black plunger isn't even installed in that area where the damage is... This ins't a design error, you fucked up.

Lol


Sent from my iPhone using Audizine

[LmG7119]

I think any parts can fail no matter if it is 3rd party one or OEM.

@Alex1188

Any follow-ups?

Thanks

[Alex1188]

I think any parts can fail no matter if it is 3rd party one or OEM.

@Alex1188

Any follow-ups?

Thanks

I contacted gfb and they had one of there US suppliers send me a brand new updated version. They had said that this was a manufacturering issue in there very early production and has since been corrected. You can see part of the email chain I had going in an earlier post above.

[LmG7119]

Do you still have to re-lube it?

[Walletclan]

Good customer service. They clearly stand behind their product.

[oVeRdOsE]

REVIVAL

I have the same issue, looks like my seal is shoot just like OP. 35 000km on it. And this post pop out from google. tks old op


Symptoms : Uni stage 2, last year I was doing 23-25 peak boost. Now I wont get over 15 psi. NO CODE.
Podi gauge seems to work , since my meth kit won't kick either, meth kit start @ 15-16psi, and now wont go.

[oVeRdOsE]

so update on mine, according to GFB mine might be counterfeit !!????? Pretty sure I bought it form them, since I clearly remember arguing about the uber expensive customs fees between Australia and canada.

I do not have the receipt, 2016 is been a while, I understand is out of warranty , but in the mean time since 2016 I put 3Xk km on the car, garage queen, dont use it much, this product should lasts longer imo.

Anyway, will get a o-ring kit, and call it a day.
next time : OEM diverter