GolfGTIforum.co.uk
Model specific boards => Golf mk5 => Topic started by: Kiddfrost on 06 December 2007, 14:36
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I think my DV's has gone.. :sad:
I was booting and it just didnt quite feel like there was the torque as usual. So kept booting it to try and analyse and all off a sudden there was a serious lack of power. Now when you boot it the turbo sort of kicks in for a few hundred rpm, then its just like a limp lettuce. The cars done 8k miles, about 4.5 months old, gets driven with enthusiasm most of the time and has visited Mr Revo.
This sounds like a classic DV issue from what I've read but would welcome some opinions to be sure. I am a bit paranoid of taking it in for warranty after just 8k as it will be pretty obvious why its gone so quickly. I am toying with the idea of just buying one (about £27) and fitting it myself...
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I'd look for airleaks first, you my have just blown a hose off somewhere. I wouldn't have thought a blown DV would make THAT much difference in power delivery but I'm no expert.
Nick
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I wasn't aware that there was a issue with the DV on these cars, i take it this only happens with re-mapped cars running higher boost?
Regardless, if the dv has indeed failed, i would assume it's a diaphram type as with most oe ones, there will now be an open loop fron the turbo outlet back to the inlet so it's virtually impossible for the turbo to generate any boost.
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I'd look for airleaks first, you my have just blown a hose off somewhere. I wouldn't have thought a blown DV would make THAT much difference in power delivery but I'm no expert.
Nick
Thanks, I've had a look now but couldn't spot anything obvious.
I asked the stealer again about the diverter valve, got a different person this time and he had no idea what one was. Anyone know if this is the official VW name for the part or is it called something else.??
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I wasn't aware that there was a issue with the DV on these cars, i take it this only happens with re-mapped cars running higher boost?
Regardless, if the dv has indeed failed, i would assume it's a diaphram type as with most oe ones, there will now be an open loop fron the turbo outlet back to the inlet so it's virtually impossible for the turbo to generate any boost.
Logic sounds good to me. Are there any other reasons the car would feel like the turbo wasn't working properly?
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I'd look for airleaks first, you my have just blown a hose off somewhere. I wouldn't have thought a blown DV would make THAT much difference in power delivery but I'm no expert.
Nick
i agree with the pipe blowing off, i wouldnt have thought a DV failure would cause this, ive had diaphragm dumpvalves split on me in the past but the car has still boosted so i assume this would be similar with a recirc
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I'm not saying this is definately the reason for the problem in this case but if the dv fails you will loose power, end of story, it's like having a hole in a boost pipe. If you initially had a small split in the diaphram then you might not notice a huge loss in power but the turbo will be working harder to achieve and maintain boost.
Kenny
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Just convinced me why i've not modified mine - god knows currently i have 4 cars and only the golf runs so i'm stuffed if i'll start messing around with that one - 300hp will just have to remain a dream - best of luck though, these things do tend to give sleepless nights and a heavy feeling in the stomach! :cry:
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could deffinately be DV, with the mk5 things are slightly different, the DV valve also controls the traction control, which vents boost to control wheelspin by reducing power, if the DV is diaphram is split and leaking boost gets vented all the time.
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mine is doing similar things...
i was giving it the beans and the power just cut out, whilst exiting a roundabout...
i quickly pulled into nearside lane, and had a play...i couold change gear, and they all selected, but the car wouldnt accellerate....it was still revving though, but in a retarded way....
i just keept going at about 45 mph doing nothing, letting it coast occasionally and then trying to power it up,...after about 1 min, of slow driving in limp mode, full power returned...
this has happened 4 times, the most recent being wednesday.
car needs a service so its going into the main dealer next week to see if its showing faults...am gonna ask them to check divertor valve, and failing that its going back to awesome to see if they can suss it...its getting 12m eibach spacers there shortly anyway.
will keep you posted.
Jt
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its getting 12m eibach spacers there shortly anyway.
Jt
fookin ell - 12m!!!!!
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Does sound like a DV issue,
If you blew a boost pipe the car would autamatically go into limp mode.
If it is still driveable it will be the DV
Revo will take the boost pressure from 7psi to 21psi, the standard plastic DV's will not handle this level of pressure for long.
Change it for a Forge piston DV, you will not have any more problems.
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I've had VAGCOM hooked up and it showed no errors. I logged some data and found a boost issue. For example, requested boost was 2400 mbars and actual boost was 1600 mbars. It is holding a little boost but will not go above around 1650 mbars. I guess this could coincide with a split diaphragm. Anyway, I'll be fitting a new Diverter valve (proper VW name is Cut off Valve) tomorrow morning so long as the stealer delivers as promised. I'll update, with pics if it's broken.
Thanks for the input guys..
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if the boost issue is the dv valve then dont replace it with another stock one or you will run into the same problem, mines been remapped and was seriously advised to swap the dv valve as the stock one cannot manage the extra boost. :smiley:
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f**k me..just booked my car in and asked them to check my divertor valve...
three different people...service advisor, head of service and one of the tech's had no idea what i was on about....at all. All had absolutely no idea what a dv was...
its in for a service tommorrow, then i think awesome can have it from now on...least they know what there on about...
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They're a good bunch at awesome.. I use them for servicing because there's no way I'd entrust my pride and joy with VW themselves :embarassed:
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Finally figured out what happened.. Switched Revo back to standard map, took it into the stealers to look at under warranty explaining the great loss of power, they did a software update. The car went better but not how a standard gti should be.
With Revo, there was a big difference in requested boost and actual boost so the car went into limp mode. When the stealer did a software update, it reset the limp mode so thats why it appeared to go better. However, some boost was still leaking which they didn't spot. Because boost on a standard map is not as high as Revo, the boost leak wasn't enough to put the car back into limp mode. So, got my tools to replace the DV,, guess what I found...
(http://i207.photobucket.com/albums/bb110/kidddfrost/DSC02190.jpg)
(http://i207.photobucket.com/albums/bb110/kidddfrost/DSC02193.jpg)
(http://i207.photobucket.com/albums/bb110/kidddfrost/DSC02195.jpg)
(http://i207.photobucket.com/albums/bb110/kidddfrost/DSC02194.jpg)
The car runs a treat now :smiley: just gotta vist Revo on Monday to get it re-Revo'd :grin:
So, if you boot it all the time and have a remap, this is what happens to your (well mine anyway) DV after 8k miles.
Will have to speak to stealer about warranty issues and Forge DV at some point..
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Don't think I can wait any longer for a Forge DV looking at that :sick: