£53 for a dump valve? There is no way in hell I'd stick a £53 dump valve on an A5. Did you miss a zero in that figure? (I'm being serious).

 

+1 Don't do it - get a CD soundtrack instead.

Cheers

 

Funny post !

To each his own aerospace!
If you like that, as you call it, darth vader sound-like then go for it.

You might think you like it but end up hating it so pick wisely especially if , as Rab claims, perhaps you missed a 0 digit in the price of the DV...

 

Rab88 - Dump valves aren't that expensive but I know what you're saying about £53, sounds far too cheap to me!

Besides, I thought you weren't able to fit dump valves on Audi engines???

 

think if I was going to buy a dump valve I'd buy a different car

A5 is a bit more GT than Fast & Furious for me.

 

What's a dump valve?

 

required after a vindaloo :thumbsup:

or ...
to make your car go "chuff" every time you change gear as dump valve releases extra pressure in air intake that in turn allows the turbo to keep spinning as there is less back pressure, that in turn gives less turbo lag and faster response.

Trouble is mostly turbo lag is not a big issue with these sort of cars due to modern turbo design and the fact they're quite small so spin up quickly. So more a case of if you want your car to go "chuff" every gearchange really

 

So the same as a wastegate then?

 

not quite ...

Wastegate is more about limiting turbo spinning speed (ergo pressure too of course) to prevent self destruction and is integrally built into turbo design, excess exhaust gas is passed through the wastegate directly to the exhaust, so is on the "input" or impeller side of the turbo if you like.

Dump (Blow off) valve is on the output (propeller) side of the turbo which pressurises the engine air intake to give the car more air, so more fuel can be used, so more power etc. Problem is that when you change gear, you (normally) lift off the throttle, this closes the throttle body, so the turbo is now pushing into a sealed container and pressure builds very quickly, this back pressure in conjunction with reduced engine output means the turbo quickly slows
so when you have the next gear and press the loud pedal the turbo has to spin up again causing the "turbo lag".
The Dump valve releases over pressure in the engine air intake generated by the turbo during gear change, with less back pressure the turbo can keep spinning more easily and be more responsive.
As said previously small, modern turbos suffer very little lag so much less of a benefit on these.

hope you managed to follow all that :cheers:

 

A dump valve allows waste gas to rid itself out of the turbo. As air passes through and out it is manipulated by gaps (similar to a trumpet) in order to make a "hissing" sound. This happens when changing gear or releasing the accelerator.

The dump valve for £53 is an Audi friendly dumpy-v. It actually slots into the dump mechanism that is already present on the Audi and changes the sound characteristics of the dump. Not "strictly" a dump valve but more of a pressure friendly alternative for young up-starts like me who have nothing better to spend their money on than a pair of Nike trainers and a car that sounds like it belongs in the wind section of an orchestra.

Forge are a good company and they do make good components. The last thing I would do is upset the German engineers’ pride by sticking a Halfords dump valve (made in China) to my over-engineered Audi

 

Brrrm - tssssssss - brrrrrrrrrrrm - tssssssss - brrrrrrrrrrrrrrrrrm - tsssssss.

Sweet - do it. :thumbsup:

 

Never ceases to amuse

Brrrm - tssssssss - brrrrrrrrrrrm - tssssssss - brrrrrrrrrrrrrrrrrm - tsssssss.

Love the impression Ess. Quite accurate too.
Now, how does yours go...?

"BRRAAAAAAAUUUUUUUUUUUUUUUUGGGGGGGHHHHHHH

Oi, get out of the facking way you muppet"?

 

hahaha did i read correct here? a dump value ok it may have missed your comprehension but this is a classy car not some halfords wanna be model...

 

... dump value ...

and what unit is that measured in if I may ask :thumbsup:

 

Also required after a vindaloo - you've got to value a good dump, and also award it a value in order that you may compare over time.