Viezu Motorsport Tune Results

[Greg Roles]

F- me, that's not a healthy car mate......did the dyno guy not say something????

[lankfert]

Whoa, that second dyno graph looks nasty! I'd say your extra boost has caused some extra problems being close to 95,000 kms.

[Ideo]

Yep.

Pretty standard story. Tune + car with a few kms causes a few underlying issues to pop up.

[h100vw]

Yep.

Pretty standard story. Tune + car with a few kms causes a few underlying issues to pop up.

Have they not got a plot of the AFRs to check in conjunction with the power.

Doesn't need to go on a dyno to check them. You can get a good output from VCDS.

Gavin

[Water Boy]

That second graph would be good to ride my bike on!

[KI11Z]

That second graph would be good to ride my bike on!

hahahaha.........

to the op, why just about slame the tune when Viezu is so willing to retune and work with you, and any other customer for that matter.... makes no sense..... I'd hate to own a company and have to put up with the internet....

[Ideo]

Have they not got a plot of the AFRs to check in conjunction with the power.

Doesn't need to go on a dyno to check them. You can get a good output from VCDS.

Gavin

Buggered if I know.

Happened to a mates GTI when we did it as well. Coilpacks, dv and clutch all needed to be replaced soon after.

So he sold it because "the tune made it unreliable". Not the no servicing for the last 30,000kms or the cheap oil that didn't meet standards, but the tune.

[ViezuAustralia]

I wonder if your stock diverter valve (DV) is leaking and causing the up's and down's on your dyno graph as it leaks boost? This is a very common issue in the Mk5 GTI's and can be replaced with a more durable revised OEM valve for around $90 or so. Have a look at Dubaddiction.com.au as he sells them.

My mate also has the Viezu motorsport tune on his MK5 GTI and the tune soon made us aware of some factory parts that were no longer up to the task (despite a full service history) after 4 years and 70,000km such as:

- diverter valve leaking (the internal diaphram had a small rip in it which was leaking boost. Replaced with new one from Dubaddiction)
- PCV valve died (replaced with Eurojet block off plate)
- coils failing and causing intermittent mis-fire (new coils fitted)

The car runs well now. Ive been trying to get him to throw it on a dyno to not only see what power its making, but to check the a/f ratios etc, but no luck so far.

^ What Lucas_R said ^

!

[Transporter]

hahahaha.........

to the op, why just about slame the tune when Viezu is so willing to retune and work with you, and any other customer for that matter.... makes no sense..... I'd hate to own a company and have to put up with the internet....

It's OK guys, the OP just wanted to know the experience of other GTI drivers with their tunes and as he said he is still happy with the tune only expected more at the lower end.

Looking at that second graph there are some issues and the time was set with DUBGTI to look at his car. After all, not everything has to be as new on the performance car that done close to 100,000km and these things can happen and are perfectly fixable.

[DUBGTI]

Sorry where did I slam the Tune?? I have said nothing but nice things about the people involved who are more than willing to help fix the problem.

I believe I was asking for people's opinion on my state of tune and if it is producing the same sort of results on the dyno and road etc as other peoples GTI's. I felt mine was a little off and decided to see if anyone here could help me with some info, so I knew where I was at in regards to my tune. Clearly there is a problem with my tune as has been stated by many people here and I thank you all for your input.

I thought that my second dyno run graph was a tad out with regards to a nice power curve, and am wondering if it would be possible to cause a leak from my DV when I changed it to the upgraded OEM Rev D version? maybe I didn't do all the bolts up enough and the added boost from the tune is causing a leak?

Any other ideas where to look for faults in my GTI, I tired to prevent weak supporting mod failure by preempting them and swapping out the known culprits before I got the tune done. I might look into the ignition system causing issues with misfires as stated in an earlier post and into the hypothetical boost leak I may have caused but not noticed until I was running more boost... who knows.