sterns

Dad is after a dump valve, but he would rather one that flutters.
I know its normally the wastegate you can hear flutter, but im sure there is a dump valve that flutters.

I got one off my old GTI-R that flutters when an adjusting screw is moved, but we dont know what DV it is or what fitting kit.

Can anyone recommed a DV that flutters, i did say to him a HKS SSQ, but as i said, he wants a flutter.

Thanks very much

Tony

Andy McCord

The fluttering you can hear is actually the turbo stalling which is not good!!

scoobylav

Are you sure on that point Andy ???

I don't think you are

Andy McCord

If hes referring to the so called turbo chatter that is

scoobylav

Surely it is the waste gate, as this only happens when you back off lightly enough to stop the dump valve dumping.

nom

It's air being rammed back through the compressor wheel.
Depending on the turbo bearings, it'll destroy it, prematurely wear it or not affect it at all
You can get some dump-valves to make the noise by adjusting the screw simply because the screw adjusts the pressure differential at which the thing dumps, so if you move it to, say, 1.2 bar & the turbo tops out at 1.1bar, it doesn't dump at all & you get the flutter...

scoobylav

So is the fluttering not normal ???
If not how is it prevented ???

Andy McCord

dhorwich

I get flutter with my HKS SSQV fitted..

Dan

scoobylav

So fluttering is normal
So fluttering is not caused by aftermarket dumpvalve
Therefore fluttering does not cause damage

Good glad we cleared that up.

nom

Well, the dumpvalve isn't adjusted correctly (for normal use) if you're getting fluttering! Or it's broken if it's the standard one.
The standard setup is for boost to be dumped, basically, whenever there is any boost. If you know your turbo/bearings, it can be possible to adjust the valve so it doesn't boost until high levels, but for your typical setup this wouldn't be a good idea...
The HKS shouldn't 'flutter', it should make a very loud 'peeep'! Very good BOV that one...

scoobylav

Therefore if I hear fluttering does that mean that my dumpvalve does not dump quick enough ?

It only flutters when backing off gently so do I need to change a setting on my dumpvalve ?

If so how is this done ?

Thanks,

Ian

nom

Backing off slowly will just mean that the pressure differential is slow enough for it 'not to bother'.
What turbo is it? Or failing that, the car?

dhorwich

my HKS one flutters when changing gear at low revs..

Dan

scoobylav

Car is a MY97 uk Turbo with variable boost but at moment is running at standard boost.