MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Dazf3110 on August 24, 2016, 07:16:53 am

Title: Best diverter valve
Post by: Dazf3110 on August 24, 2016, 07:16:53 am
morning folks, i will be looking to get my Mk5 GTI stage one remapped soon enough and i was just reading a few things on here about upgrading/changing the DV from stock. What would be the best one to replace the stock one with after the remapp?

Many Thanks Daz
Title: Re: Best diverter valve
Post by: DANBOY66 on August 24, 2016, 07:32:41 am
from what i have been reading the new gfb dv+ is the best thing to replace it with

other than that a revision G
Title: Re: Best diverter valve
Post by: flashp on August 24, 2016, 11:30:01 am
I would say OE personally.  :popcornsoda:
Title: Re: Best diverter valve
Post by: Shoduchi on August 24, 2016, 11:36:02 am
I would say OE personally.  :popcornsoda:
Why? Have you tried the GFB DV+ and didn't like it? :confused:
Title: Re: Best diverter valve
Post by: lukemk5gti on August 24, 2016, 12:35:41 pm
I'll be getting a GFB DV+ with my current rev D solenoid
Title: Re: Best diverter valve
Post by: r5gtt on August 24, 2016, 01:55:58 pm
I have the gfb dv + with rev D and it's brilliant  :jumping:
Title: Re: Best diverter valve
Post by: flashp on August 24, 2016, 02:18:20 pm
I would say OE personally.  :popcornsoda:
Why? Have you tried the GFB DV+ and didn't like it? :confused:
I looked at it but decided against it. I was talking with a company who had more experience of this than me and the evidence seemed to suggest it might not do anything more than a serviceable OE part would. It's only a personal opinion and if I were proved wrong by empirical evidence I'd probably go and buy one. On  the face of it they sound like a great product but as is the way with many of these tuning goodies there is a good deal of marketing involved. I've never had any boost issues apart from the usual KO4 compressor surge. It was for this reason that I started looking at these and I also found a YouTube video where this chap in America believed it solved this problem. When I understood more about what causes compressor surge on the KO4 I felt this information was inaccurate so I left it. If it did solve the problem of compressor surge I'd buy one tomorrow but I don't believe that it would. I'd be interested to know for what reasons these are bought and I'd almost be happy to realise that I'm missing out on some tuning goodness but I'm really not sure I am. I'm not saying that it's either c**p or rubbish but more that I remain to be convinced.  :happy2:
Title: Re: Best diverter valve
Post by: 993BOY on August 24, 2016, 03:04:05 pm
Fitted my DV+ just to avoid the split diaphragm issue, since there isn't one, it is a fit and forget mod  :happy2:
Title: Re: Best diverter valve
Post by: r5gtt on August 24, 2016, 03:44:22 pm
And no chance of leaks from it so can rule that out when you do have a boost leak.
Title: Re: Best diverter valve
Post by: Shoduchi on August 24, 2016, 04:11:19 pm
I would say OE personally.  :popcornsoda:
Why? Have you tried the GFB DV+ and didn't like it? :confused:
I looked at it but decided against it. I was talking with a company who had more experience of this than me and the evidence seemed to suggest it might not do anything more than a serviceable OE part would. It's only a personal opinion and if I were proved wrong by empirical evidence I'd probably go and buy one. On  the face of it they sound like a great product but as is the way with many of these tuning goodies there is a good deal of marketing involved. I've never had any boost issues apart from the usual KO4 compressor surge. It was for this reason that I started looking at these and I also found a YouTube video where this chap in America believed it solved this problem. When I understood more about what causes compressor surge on the KO4 I felt this information was inaccurate so I left it. If it did solve the problem of compressor surge I'd buy one tomorrow but I don't believe that it would. I'd be interested to know for what reasons these are bought and I'd almost be happy to realise that I'm missing out on some tuning goodness but I'm really not sure I am. I'm not saying that it's either c**p or rubbish but more that I remain to be convinced.  :happy2:
I replaced my rev G DV for the GFB DV+. The diaphragm of the rev G was intact when I removed it. I can tell you that I can feel a faster boost on WOT and much faster boost response when on partial throttle to WOT.

If you look at the design you'll get why. The DV+ seals as well as any working rev G DV does but due to the piston design it won't rupture with time. The interior springs will make the DV+ close much faster than the rev G DV so the system will lose less air when you apply pressure to the throttle pedal.

I'm happy with the money spent on that part and I think you're indeed missing out. Since it's so easy for you to access the DV, I'd suggest see if you can let someone lend you a DV+ for you to try before buying. Like a test drive with it. :smiley:
Title: Re: Best diverter valve
Post by: flashp on August 24, 2016, 06:39:19 pm
I would actually be genuinely interested  in this but unfortunately I don't know anybody with a GTI, least of all with one of these fitted. 
Title: Re: Best diverter valve
Post by: r5gtt on August 24, 2016, 06:56:00 pm
The forum members speak for the GFB DV+ so no need to try just buy fit and forget.
Title: Re: Best diverter valve
Post by: Dazf3110 on August 24, 2016, 06:58:32 pm
Can anyone post a link as to witch one to get? Much appriciated guys!
Title: Re: Best diverter valve
Post by: r5gtt on August 24, 2016, 07:09:35 pm
http://m.ebay.co.uk/itm/VW-MK5-Golf-GTi-Edition-30-Pirelli-Edition-2-0-TFSi-GFB-DV-T9351-/271807912516
Title: Re: Best diverter valve
Post by: r5gtt on August 24, 2016, 07:11:04 pm
https://www.awesomegti.com/shop-by-brand/gfb/gfb-dv-for-vag-20fsi-turbo-engines
Title: Re: Best diverter valve
Post by: shoaybmakda on August 24, 2016, 08:55:12 pm
Waiting to buy one of these - no eBay code in sight as of yet though  :sad1:
Title: Re: Best diverter valve
Post by: Little_Dave on August 25, 2016, 12:13:14 am
I agree with what shoduchi said previously...

Fitted a DV+ a few days ago to my S3 and found its sharpened throttle response and feels like it's holding boost better, part throttle the car feels more urgent and ready to go as sometimes with the Rev G fitted it could feel a little flat and hesitate

Dave
Title: Re: Best diverter valve
Post by: flashp on August 25, 2016, 11:17:55 pm
I do have a question regarding these and their publicised effect on compressor surge when fitted to a KO4 equipped car. Does it address the issue at all?
http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge (http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge)
This would genuinely interest me.
Title: Re: Best diverter valve
Post by: Shoduchi on August 25, 2016, 11:29:41 pm
I can't help you with that. Not sure if I just can't hear it with the OEM air box or if my custom tune avoids it.  :confused:
Title: Re: Best diverter valve
Post by: rich83 on August 26, 2016, 12:14:52 am
I do have a question regarding these and their publicised effect on compressor surge when fitted to a KO4 equipped car. Does it address the issue at all?
http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge (http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge)
This would genuinely interest me.

I dont see how it could possibly have any effect on Comp. surge. I think that GFB article is a bit misleading.
Title: Re: Best diverter valve
Post by: flashp on August 26, 2016, 06:57:49 am
I wasn't convinced the first time I read it either Rich. But there it is, the manufacturer is claiming this product can influence it. I understood surge to be associated with compressor housing volume/shape and the impeller shape/blade pattern. I've been lucky in that I haven't had a DV failure yet.
Title: Re: Best diverter valve
Post by: flashp on August 26, 2016, 09:38:53 am
I can't help you with that. Not sure if I just can't hear it with the OEM air box or if my custom tune avoids it.  :confused:
@Shoduchi (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=10590): What kind of tune are you running? I've heard RTech can get around compressor surge to some degree. I've also been aware of the kit BBT can offer to deal with this which isn't necessarily overly expensive.
I'm also curious as to what a car around stage 2 might feel like with a standard intake fitted. I know the likes of Revo can help an engine breathe at high rpm but I also believe that there is a trade off at the lower end by way of a shift in the spread of torque. I have this thought that won't go away and it is that for the 2% of time the car is on track the Revo intake is great and for the road it might be possible that it's not as optimized as the OE intake. It doesn't necessarily make sense to have a part fitted that does what it's supposed to for 2% of the time and it may be the OE intake might sacrifice a small degree of performance on track that may not even be significant and for the other 98% it's spot on. I also never bought the Revo for the noise it makes.

I would consider refitting it but I don't have a suitable tool to get at the clip down by the turbo.

I'm interested to hear your thoughts, I know there are a handful of people here who have been down the intake route and reverted back to OE.

Cheers.
Title: Re: Best diverter valve
Post by: flashp on August 26, 2016, 09:42:56 am
I do have a question regarding these and their publicised effect on compressor surge when fitted to a KO4 equipped car. Does it address the issue at all?
http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge (http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge)
This would genuinely interest me.

I dont see how it could possibly have any effect on Comp. surge. I think that GFB article is a bit misleading.
@rich83 (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=709) What are you thoughts on it as a product? Not wishing to start a massive debate  :laugh: but I know this has been divisive in the past. :happy2:
Title: Re: Best diverter valve
Post by: Shoduchi on August 26, 2016, 10:34:42 am
I can't help you with that. Not sure if I just can't hear it with the OEM air box or if my custom tune avoids it.  :confused:
@Shoduchi (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=10590): What kind of tune are you running? I've heard RTech can get around compressor surge to some degree. I've also been aware of the kit BBT can offer to deal with this which isn't necessarily overly expensive.
I'm also curious as to what a car around stage 2 might feel like with a standard intake fitted. I know the likes of Revo can help an engine breathe at high rpm but I also believe that there is a trade off at the lower end by way of a shift in the spread of torque. I have this thought that won't go away and it is that for the 2% of time the car is on track the Revo intake is great and for the road it might be possible that it's not as optimized as the OE intake. It doesn't necessarily make sense to have a part fitted that does what it's supposed to for 2% of the time and it may be the OE intake might sacrifice a small degree of performance on track that may not even be significant and for the other 98% it's spot on.

I would consider refitting it but I don't have a suitable tool to get at the clip down by the turbo.

I'm interested to hear your thoughts, I know there are a handful of people here who have been down the intake route and reverted back to OE.

Cheers.
I'm limited by the petrol I have here (the best I can get at the pump has 98 octanes) so my tuner prefers to leave the tune at (spikes at 1,5 bar) 1,4 bar since he knows it's reliable for all the engine and DSG components. With a better petrol I'd be making +20 BHP from his experience with other similar cars. He can get me 100 octanes petrol but it isn't cheap so I'm only going to consider using it for doing track days in the future, if my budget allows. My tuner worked for Unitronic when they grew a lot in the USA. He does his tunes to make the cars drive like he likes to drive them, for what I realized from talking to him. He was more worried with the DSG than anything else when he tuned the engine, since in Portugal it gets really hot and the box can suffer more wear if I don't take that in mind when pushing the car. I avoid stressing any mechanical component too much, but I know others who get this kind of cars can be too animals driving them. :laugh:

I asked him if I had any benefit from fitting a cone filter intake (would drive illegal which I don't like) and for him it would be marginal and only at top end, which indeed I don't use 98% of the time. For the daily use it's perfectly fine and tune level doesn't request more air than the OEM air box can provide from looking at the logs.

At the moment I have 2 options if I want to upgrade the intake:
-Get a good cone filter intake and just use it on track;
-Get the TTS air box intake and relocate the battery to the trunk. I'm still considering if a lightweight battery would be enough for my needs since they don't last long (most likely I'd have to charge it regularly) and the better batteries aren't cheap.

Being reasonable I don't do enough track days for all the investment involved so I'm leaving it at it is till next year.

You can get a hose clamp plier set cheap from ebay so you can do whatever you like when you need. I got this set for example: http://www.ebay.co.uk/itm/261751871926 (http://www.ebay.co.uk/itm/261751871926).

If I was in the UK, I'd book with R-Tech and optimize the tune to the car's hardware. From what I read online it would be good to fit the BBT anti-surge K04 compressor and from what I can think of it, due to an improved design it should have an higher threshold to surge, so it's easier for the tuner to prevent it. It's also a lot cheaper than go hybrid K04. :smiley:
Title: Re: Best diverter valve
Post by: Matt81 on August 26, 2016, 03:41:10 pm
Well, I've just ordered a DV+ for my eddy so will add my opinion to the mix once it arrives.

Not expecting miracles but a sharper throttle response would be nice.
Title: Re: Best diverter valve
Post by: Little_Dave on August 26, 2016, 03:49:59 pm
My car is stage2+ and so like most of the other mods maybe u won't get as dramatic an effect on a car not tuned to that level

I have the r tech map on mine and had no issues with the revG but wanted to give this a go and can say it's made a difference on my car

Dave
Title: Re: Best diverter valve
Post by: rich83 on August 26, 2016, 05:12:18 pm
I do have a question regarding these and their publicised effect on compressor surge when fitted to a KO4 equipped car. Does it address the issue at all?
http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge (http://www.gfb.com.au/tech/tech-articles/11-the-truth-about-compressor-surge)
This would genuinely interest me.

I dont see how it could possibly have any effect on Comp. surge. I think that GFB article is a bit misleading.
@rich83 (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=709) What are you thoughts on it as a product? Not wishing to start a massive debate  :laugh: but I know this has been divisive in the past. :happy2:

As far as I have seen and have heard... the newer ones are fine. However, rev G works for me and has done for 3 years running 1.4bar.
Title: Re: Best diverter valve
Post by: DANBOY66 on August 26, 2016, 05:14:31 pm
just fitted one on my car stage 3 gti  :grin: :grin:

will see how it performs over the weekend  :driver:
Title: Re: Best diverter valve
Post by: flashp on August 27, 2016, 07:47:41 am
I can't help you with that. Not sure if I just can't hear it with the OEM air box or if my custom tune avoids it.  :confused:
@Shoduchi (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=10590): What kind of tune are you running? I've heard RTech can get around compressor surge to some degree. I've also been aware of the kit BBT can offer to deal with this which isn't necessarily overly expensive.
I'm also curious as to what a car around stage 2 might feel like with a standard intake fitted. I know the likes of Revo can help an engine breathe at high rpm but I also believe that there is a trade off at the lower end by way of a shift in the spread of torque. I have this thought that won't go away and it is that for the 2% of time the car is on track the Revo intake is great and for the road it might be possible that it's not as optimized as the OE intake. It doesn't necessarily make sense to have a part fitted that does what it's supposed to for 2% of the time and it may be the OE intake might sacrifice a small degree of performance on track that may not even be significant and for the other 98% it's spot on.

I would consider refitting it but I don't have a suitable tool to get at the clip down by the turbo.

I'm interested to hear your thoughts, I know there are a handful of people here who have been down the intake route and reverted back to OE.

Cheers.
I'm limited by the petrol I have here (the best I can get at the pump has 98 octanes) so my tuner prefers to leave the tune at (spikes at 1,5 bar) 1,4 bar since he knows it's reliable for all the engine and DSG components. With a better petrol I'd be making +20 BHP from his experience with other similar cars. He can get me 100 octanes petrol but it isn't cheap so I'm only going to consider using it for doing track days in the future, if my budget allows. My tuner worked for Unitronic when they grew a lot in the USA. He does his tunes to make the cars drive like he likes to drive them, for what I realized from talking to him. He was more worried with the DSG than anything else when he tuned the engine, since in Portugal it gets really hot and the box can suffer more wear if I don't take that in mind when pushing the car. I avoid stressing any mechanical component too much, but I know others who get this kind of cars can be too animals driving them. :laugh:

I asked him if I had any benefit from fitting a cone filter intake (would drive illegal which I don't like) and for him it would be marginal and only at top end, which indeed I don't use 98% of the time. For the daily use it's perfectly fine and tune level doesn't request more air than the OEM air box can provide from looking at the logs.

At the moment I have 2 options if I want to upgrade the intake:
-Get a good cone filter intake and just use it on track;
-Get the TTS air box intake and relocate the battery to the trunk. I'm still considering if a lightweight battery would be enough for my needs since they don't last long (most likely I'd have to charge it regularly) and the better batteries aren't cheap.

Being reasonable I don't do enough track days for all the investment involved so I'm leaving it at it is till next year.

You can get a hose clamp plier set cheap from ebay so you can do whatever you like when you need. I got this set for example: http://www.ebay.co.uk/itm/261751871926 (http://www.ebay.co.uk/itm/261751871926).

If I was in the UK, I'd book with R-Tech and optimize the tune to the car's hardware. From what I read online it would be good to fit the BBT anti-surge K04 compressor and from what I can think of it, due to an improved design it should have an higher threshold to surge, so it's easier for the tuner to prevent it. It's also a lot cheaper than go hybrid K04. :smiley:
Thanks for the detailed reply  :happy2:
I think at some point very soon I'm going to get the appropriate tools to get at the clip easily and I'll re-fit the OE intake just to see what's going on. I've been curious for some time now  :thinking:
Thanks for the link on that tool kit.

I think the standard air box is capable of flowing quite a large volume of air, I've no idea where it's limits are but there are more than few people running it with with stage 2. I also believe that the plastic assembly transfers heat less readily than metal, such as the tube work in most intakes. Maybe they should have moulded them?? I'm also wondering if it will have any impact on intake temps, although I'm expecting it not to as the intercooler should be taking care of that.

I've also sent BBT an email asking after their KO4 kit with specific regard to compressor surge, so I'd expect them to come back with details on the kit of parts you spoke of. If not then the hybrid is an option provided I could sell the KO4 that comes off.

Also going to have a look at my DV just out of curiosity...



Title: Re: Best diverter valve
Post by: GTION on December 25, 2018, 06:48:55 pm
Hi, really good thread!

How difficult is it to replace the DV?

I haven’t owned my mk5 GTI long but would like to upgrade to a GFB DV+

Thanks
Title: Re: Best diverter valve
Post by: probedb on December 28, 2018, 01:50:43 pm
Can be done just with the driver's side wheel off and the wheel arch linings out. Reaching it and getting pressure onto the bolts was a bit troublesome but it got done :)
Title: Re: Best diverter valve
Post by: Gtcpaul1971 on January 04, 2019, 06:23:27 pm
Had my year old rev D replaced today with the gfb dv+. The boost seemed rubbish on it so decided to try this. Seems a lot better now going by my drive back. My rev D was not broken but I have definitely noticed an improvement. So far so good 👍
Title: Re: Best diverter valve
Post by: slynch23 on January 05, 2019, 11:33:42 am
If the current DV is leaking boost would I get a warning on the dash? Had my GTi 6 months now I was just wondering whether I should replace the DV or not as everyone seems to. Will I notice a difference even if the one that’s fitted is ok? It’s a 2006 model and I’ve no idea if it’s been replaced before
Title: Re: Best diverter valve
Post by: AJP on January 05, 2019, 01:51:40 pm
If the current DV is leaking boost would I get a warning on the dash? Had my GTi 6 months now I was just wondering whether I should replace the DV or not as everyone seems to. Will I notice a difference even if the one that’s fitted is ok? It’s a 2006 model and I’ve no idea if it’s been replaced before
Probably not, unless it was losing so much boost it triggered a code. A DV can deteriorate over time, losing more boost as time goes on. So not only do you rarely get a fault code, it can be difficult to gauge a slow drop in boost over time from actually driving the car.

It's deemed good practice to replace the DV at service time, or perhaps every two services. At the very least it's a good idea to do a visual check of the valve from time to time (although not all DV faults can be immediately spotted by eye). Same goes for checking the cam follower too. That one is crucial.

When I test drove my GTI up I knew it was a bit down on power. Everything else about the car was perfect - big history, annual VW services etc. So I took the punt on it just needing a new DV. Few weeks later a new revision G went in, out came the old and obviously split revision C, and it felt like it'd had a mini remap! Boost restored.

Not everybody will gain that sort of power bump - there's a fair chance your DV is working fine. But it's a very good idea to get it swapped out anyway for peace of mind that you're getting full boost for the lifespan of the new DV.