VDO turbo boost gauge buzzing, how to stop it?

do you still have any contacts for them? I'm chasing a new gauge for my GU so i can leave the old one in the GQ when I sell it.

Thanks,

I am in Brisbane, and the VDO agent is only 10 minutes away.
Where I bought the gauge :-)

Have always preferred to use VDO.

how much was yours Mr Plod? Been a efw yrs since I got mine, but at time i was working at Siemens :(

$59.00. Rang around to get the best price, I think Repco was cheapest. Agent matched it.
I think I got it for trade price, not RRP.
Flashed an ABN number for the price.

Plus a cheap non VDO pod for $20.00, which I had to modify to get it to fit.
Gauge was too long for the pod, so I cut a bit of some 2" PVC pipe I had left over from a previous job for an extension, and cut a black cap off a spray can of paint as a shroud.

I had some spare vacuum pipe and a bit of hose left over from installing the air bags about 6 years ago.

Had a buy a 'T' though for $2.00 from supercheap though. :-)

Just call me a scrounger!

Great, thanks Flash.

When you mention a restrictor, what type of item are you talking about?
Just taking the pipe diameter down to something smaller?
Maybe a piece of foam from an aircleaner in the line, maybe 12mm long?
Or maybe use a disposable paper fuel filter in the line, something that will pass air, but take out the small pressure surges?

Yes, another option is to put the pipe for the gauge after the intercooler.
Was just trying to get it close to the wastegate to see what the waste gate is doing in real psi, and not having to allow for the pressure losses through the intercooler and associated piping. Assume there might 1 or 2 psi in that, but I may be wrong.

Might try VDO as above first.

But any help appreciated.

I would put it after the intercooler, which is what the engine is seeing anyway.
I think that alone will cure your problem.
Cheers

Someone else mentioned it could be from the pulsations from valves in a 4cyl engine- this could quite possibly be true?
Anyway a restrictor will fix it. You need anything which will reliably restrict the pressure to a "trickle" such as an old carby jet or any small piece of metal etc with a tiny hole.
It will work best if at the manifold end rather than the gauge and obviously needs to be secured in the line in such a way that it cannot get ever sucked into the engine- not that there's ever any appreciable vacuum n a diesel.
I fixed that buzzing problem on a mates Paj using an old aluminium spray nozzle I had in a drawer for water injection (on a hot Torana- from many years ago in my youth)
It fitted nicely in the plastic line to the gauge.
Cheers

I can't make out why is is stated to be Teed of the overfuel line rather than the boost pre or post intercooler. I guess it is off the line to the actuator or waste gate line.

I agonised over where my VDO gauge was to be connected Flash but reason that the boost from the turbo to the intercooler is what is controlled by the turbo systems. The POST intercooler pressure is subject to all sorts of things, like the pre-intercooler pressure, the restriction of the intercooler (and as to whether the engine can draw off air faster than the intercooler allows), the temperature of the ambient at time of day and it's impact on cooling. Too many variables to warrant rather than a pre-intercooler position.

I thought if I get serious about that all, I can put another gauge post-intercooler to get more knowledge as I think the Nissan intercooler is restrictive more than others.

Flash, when I mentioned that it was caused by the inlet valves, I should have elaborated. When the inlet valves open, the piston is travelling down which causes a pressure drop in the manifold. On a 4 cylinder, thats one induction stroke per revolution and that's why it's much more noticable on a 4.
Dampening the signal by restricting the line will solve this problem, but the gauge will be less sensative and slower to react. There is a happy medium there somewhere.
Personally I think the only downside to fitting the line on the turbo side of the intercooler is the heat factor. As long as the fitting and tubing can tollerate the heat it wouldn't be a problem because there is minimal pressure drop accross an intercooler, unless it's blocked, you would never see it on the gauge.
I chose the turbo side because I want to know what the turbo is producing and because my boost sensor is in the intercooler. Any major pressure drop will be noticable with power loss and the turbo working overtime.
Cheers

Thanks Chaz,

Yes, it is only a boost gauge.