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Discussion Starter · #1 ·
anyone have their ECU flash cause a boost leak? today on my way home from work my boost pressure dropped from a peak of 16-18 down to a max of 8 and i can hear a much higher whine when the turbo spools...anyone else had this problem and was it a torn diaphragm in their DV?

i am about to go pull the DV to see if it is torn...i was unable to find any leaks anywhere else in the system...
 

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Discussion Starter · #3 ·
i have the APR stage 1 ECU flash. i am out in my garage pulling the DV right now to see if the diaphragm is torn...
 

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Discussion Starter · #4 ·
so it turns out that the spring in the DV was just seriously compressed causing the boost leak above 7-8psi. i took it into the dealership and they stretched out the spring on the B DV and ordered me the C. it should be in next week and be installed.
 

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ian dummy, did they give you any hint at a reason for the spring compressing like this? Do you know how it could have happened? I wouldn't think that the ECU flash would have done it cause the DV moves its entire length no matter how much boost you're producing. Defective spring maybe. You're the one of the many that I have read about on this forum that has had mechanical problems not caused by wear and tear. The another person here had a problem with one of the prongs on his clutch's diaphragm spring just breaking off and trashing his entire clutch assembly.
 

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Discussion Starter · #8 ·
they did not give any reason, but i just got the call yesterday that the "C" version DV came in and is ready for install. hopefully it will last until the Forge DV is done being R&d'd and is released.
 

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I have heard about this "C" version of the DV, but I have no idea what it means. What makes it different from the one that's in our cars now?
 

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Discussion Starter · #10 ·
the diaphragm of the "B" version was made with a type of rubber that was weak and prone to failure and tearing, espcially if you are running higher than stock boost (e.g. ECU flashed). i guess this was a problem even with GTIs being driven really hard with the stock level of boost so they re-did the DV with a stronger rubber for the diaphragm. these DVs are still known to have the diaphragms tear though, but they are stronger.

this is also the reason VW released the "G" version of the PCV valve as they were also failing and causing boost leaks.

you can get both of these parts from your dealership or from ECS tuning. just be careful because if they know you are chipped it will not be covered under warranty as part of the reason for the parts failing can be attributed to the higher boost pressures.
 

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Thanks for the info ian dummy. I am not chipped as I have this car for travel only until a couple of months from now when I move closer to work. Is the upgraded DV available only as an option from VW, or are they recommending that you replace the existing DV with the new one and covering the costs under warranty (like a mandatory swap-out)?
 

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Discussion Starter · #12 ·
the upgraded DV is standard on all the 2007 GTIs since it was changed. for the 2006 models, VW will change it out under warranty if you are having problems with it. otherwise, it works just fine. you can try going to your dealership and talking them into changing it out, but i doubt they'd do the work unless you're having a problem.

as for waiting to chip, i drive 100 miles round trip to work each day in my car and run the APR 91 octane program as my daily driving program. in combination with my EVOMS v-flow intake, i am actually getting about 1-1.5 mpg more (avg) than i was getting prior to the upgrades, sometimes as much as 3 mpg. (of course, when i decide to drive like an asshole and fly down the freeway faster than i used to because it is tons of fun, that all goes out the window.) but when i drive freeway speeds, i actually get better gas mileage.
 

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I didn't realize that the C version already existed in the '07 s . I bought my '07 at the end of November, so it should already be stock, right?
I have been having major guilt trips because of my 140 mile round trip daily commute. I am kinda glad to hear that someone else drives their car almost as many miles a day as I do. I modified my intake to match the EIP cold air intake almost exactly, except it only cost me about $100 altogether. No CEL's, great throttle response, and a little louder spooling sound. I also put the A3 pipe on, and installed a liquid filled boost gauge with blue LED background (bought LED's seperately and modifed the gauge to fit them). This car is a GREAT highway car, until you hit rough roads. Then it's like driving a rig. I still think that I am going to wait until this summer to chip the car. Things are just too crazy right now, with being tied up for 12 hours a day driving to work, being there, the driving back home.
 
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