Was just filling up with fuel when some plonker in a Corsa VXR tanks it into the petrol station, I heard like a farty duck noise coming from the car?

Was like WTF?

Then as he went off he absolutely tanked it up the road and every 2 or 3 seconds there was a short sharp duck like noise coming from his car?

I have heard dump valves on big engined jap cars like supras and they sound quite nice, like a quiet but noticable "tsssh" that lasts about 2 seconds.

But why the hell would you put something like this thing on your car? ****ing daftest sound I've ever heard :thumbdwn:

There is always one twonk and it's usually a VXR driver

Carl:thumbup:

Because judging by the described driving style the driver is a c*ck.

FWIW don't distress yourself too much as I think the car will probably be in a scrap yard soon enough after ending in a ditch due to being driven by a tool.

are there any real benefits to a dump valve? they dont come as standard on any car do they??

are there any real benefits to a dump valve? they dont come as standard on any car do they??

They do, but are mostly recirculating not the noisy vent to atmosphere type described here

As much use as tit's on a fish on a derv though so don't go thinking about it

are there any real benefits to a dump valve? they dont come as standard on any car do they??

Dump valves do have benefits, but mostly on older cars where recirc valves weren't fitted. They can help prolong the turbo and can also increase acceleration by helping the turbo to keep spinning during gearchanges when the throttle is closed.

IIRC, on a petrol car when the throttle is closed, for example during a gearchange, there is a huge mass of air with nowhere to go which puts reverse loading on the turbo vanes and also slows the turbo down, a dump valve releases this pressure, reducing loading on the turbo vanes and allowing the turbo to keep spinning.

As stated, useless on a diesel car primarily because diesels don't have throttles so there isn't a huge lump of air with no where to go creating load on the vanes as much. On a diesel car, they can slow the cars acceleration because there is a momentary loss of air so the injectors have to reduce the amount of fuel they are pumping in to the engine before the turbo is back up to speed and the injectors can go back to pumping at full pressure.

This is from memory, and many vodkas and lagers have been drunk since I studied this, so I may be wrong on specifics but I'm fairly sure the overall explaination is correct.

Corner will appear, driver will go straight on. Problem solved

Farting duck will be a gonner

You mean like this??

You mean like this??

and to top it off that looks very much like a 1.8T too

You mean like this??

At that sound

did'nt even know they were turbo charged, not interested enough to look.

did'nt even know they were turbo charged, not interested enough to look.

They're quite good, actually :sofahide:

They're quite good, actually :sofahide:

I saw a blue one the other day and thought it look quite smart:)

A friend of a friend has one with 270hp soon to be over 300hp , sees off his Skyline which he isnt happy about so dont underestimate them

Many people have to change the dump valves as they modify the car , i had to replace the stock recirc one on my skyline as they are known to leak at higher boost levels , hated the TISH noise but not a lot i could do with it , the quieter ones often cause the car to stall as they dont work as well

Probably got an electric 'supercharger' on it as well.

You mean like this??

thats really funny. :rofl: maybe I should have plugged my headphones in, made everyone in the office laugh