A waste gate opens in the exhaust side of the turbo when pressure in the turbo builds up too high, normally after heavy acceleration.when the waste gate opens the exhaust gases stop spinning the turbo spools.
A dump valve dumps the pressurised air in the induction system back to the atmosphere, a dump valve is used to prevent the turbo spooling back on itself.
Not strictly into the atmosphere, depends on what car
#17: Re: dump valve Author: Harry, Location: StaffordPosted: Tue Jun 22, 2010 2:47 pm ---- Don't know how badly they do loose power but I think they sound great.
#18: Re: dump valve Author: Allen_206, Location: midlandsPosted: Tue Jun 22, 2010 2:48 pm ---- i love that white 206 . sorry for spamming
#19: Re: dump valve Author: Lodey, Location: Penzance & Falmouth CornwallPosted: Tue Jun 22, 2010 2:50 pm ---- oh and dont fit one to my old car lol
#21: Re: dump valve Author: Mattie-RS, Location: A Track near you ;)Posted: Tue Jun 22, 2010 2:59 pm ---- DV sound poo on dervs anyway, ive heard it sounds like a farting noise
DV on petrols sound awesome tho Thats why i have one on my petty 206
#22: Re: dump valve Author: Mike_H, Location: RuncornPosted: Tue Jun 22, 2010 3:00 pm ---- As said previously in the thread, the dervs you hear with a 'dump valve' are actually solenoids. It's purely for willy waving. They aren't that difficult to fit, and won't cause any issues with the engine, as they are just designed to make the sound when you shift.
#23: Re: dump valve Author: Adz2598, Location: Oldbury west midlandsPosted: Tue Jun 22, 2010 4:15 pm ---- Haha I was just seeing if it was a easy job but by the sound of it f**k that lol
#24: Re: dump valve Author: twed207, Location: borders, near carlisle.Posted: Tue Jun 22, 2010 4:50 pm ---- you can get kit's from the derv doctor and other sites but they need alot of setting up as they work in a completely different way to petrol turbo's!
Ash wrote:
Don't all turbo's have dump valve's fitted?
as fezzie wrote, it's wastegates. and no, not all turbo's have wastegates. the VGT (Variable Geometry Turbo's) turbo's fitted to the 1.6HDi FAP dont have them as the ECU move the vanes inside the exhaust wheel housing to control the turbo speed.
Elldan wrote:
i heard a deisel golf with one today, sounded good
that may have just been waste gate chatter mate.
#25: Re: dump valve Author: The_Stig, Location: StirlingPosted: Tue Jun 22, 2010 4:53 pm ---- may sound daft, but is there anyway to make the wastegate chatter louder??
#26: Re: dump valve Author: twed207, Location: borders, near carlisle.Posted: Tue Jun 22, 2010 5:00 pm ---- a few mates have some heavily modified jap cars with dump valves fitted and they sound, the tits!
#27: Re: dump valve Author: twed207, Location: borders, near carlisle.Posted: Tue Jun 22, 2010 5:03 pm ----
The_Stig wrote:
may sound daft, but is there anyway to make the wastegate chatter louder??
more boost maybe? but with more boost, other things need changed. I.E. mapping and if you're doing it on a 2.0HDi, you'll be better off fitting a FMIC first to help keep EGT's down.
#28: Re: dump valve Author: fezzie22, Location: GatesheadPosted: Wed Jun 23, 2010 8:40 am ----
The_Stig wrote:
may sound daft, but is there anyway to make the wastegate chatter louder??
Chatter sounds amazing, but i was told its not good for the engine, but that could be bull shizzle
#29: Re: dump valve Author: b47t0n, Location: sheffieldPosted: Fri Jun 25, 2010 3:51 pm ---- fit a does pipe insted
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Thats why i have one on my petty 206 
and no, not all turbo's have wastegates. the VGT (Variable Geometry Turbo's) turbo's fitted to the 1.6HDi FAP dont have them as the ECU move the vanes inside the exhaust wheel housing to control the turbo speed. 
