what do dump vale do ?

[sionrow]

hi all, im just wondering what a dump vale does exsept for making me smile when it
dumps lol but i dont know what it does and when i ask my mates they laugh at me
but weather they dont know aswel i dont know, so if some one can tell me that will
be great.
thankes

[autoworksnovasport]

if they just laugh and not tell you id guess they dont know either

[Jeff16v]

It blow pants off young ladies,

Edit-I got one too late

[davidfox280585]

in short releases returned boost heading back towards the turbo compressor stopping it stalling the compressor blades and puttuing unnecessary strain on the turbine shaft/bearing
increasing the life span of the turbo

[davidfox280585]

or if your cool like me you run without a dump valve with a dirty big cone filter and chatter the bollocks off it lol
like so
http://www.youtube.com/watch?v=-gH7QL3yvkA&feature=related

[Jack]

A DV sits between the turbo and throttle plate. It 'dumps' air out of the inlet tract when the throttle plate is closed - either back on the filter side of the turbocharger (recirc valve), or to atmosphere (blow off valve).

This is the diagram I drew a few years back when explaining it to Mike:

http://i13.photobucket.com/albums/a266/razorjack/Misc/dv_diag.gif

Air coming back and hitting the turbine blades (in #2 above) causes it to stall, making a chattering noise that might sound cool but isn't doing the turbo much good.

Then there's a wastegate, which allows air to bypass the turbo on the exhaust side, but thats another explanation lol

[mowgli]

in basic terms, it makes 15 year old kids at macdonalds drive thrus get an erection

but in real life terms, it is a good device to stop overboosting at lower revs.

[scott.parker]

Then there's a wastegate, which allows air to bypass the turbo on the exhaust side, but thats another explanation

common Jack i wish to know, so whats the screamer pipe bizz?

[bazil]

IMO bov to air suck, recirc FTW

[sionrow]

soooo in other words it help prevnt turbo lag and makes kids happy in mcdonels lol
in teck terms thanks

[mowgli]

You've pretty much hit the nail on the head

[General Baxter]

lol, it does work, but then again, ladies in atherstone, drop there kegs, when you open a coke bottle lol

[Jack]

Then there's a wastegate, which allows air to bypass the turbo on the exhaust side, but thats another explanation

common Jack i wish to know, so whats the screamer pipe bizz?
Funnily enough I have a diagram for a wastegate too lol

Wastegate sits on the exhaust side of the turbo and acts as a bypass to allow exhaust gases around the turbine, limiting how much boost it generates.

http://i13.photobucket.com/albums/a266/razorjack/Misc/wastegate_diag.gif

A screamer pipe doesn't go back into the exhaust, it just drops the exhaust gas out to atmosphere.

[Adam]

Screamer pipe is basically the exit of the wastegate (the wastegate being external in that type of setup and not within the turbo itself)