What Is The Difference

[ToyotaTech15]

As the title says what is the difference, between a wastegate and dumpvalve?

is there different types of wastegates (external etc)?

What do each do?

Gary

[Glanza_cl]

every turbo has a wastegate, and external one is exactly what it says- it is an externally gated wastegate for that turbo, they are bigger stronger and can hold a larger amount of boost with out opening.

all the dump valve does is vent the excess air that the turbo doesn't need so it doesn't go back into the turbo but people like the noise it creates (chatter) so tend to block it up anyway.

[ToyotaTech15]

cool cheers mate,

so it doesnt really matter what one you use?

just wondered because you see people with dump valves on lower performance engines and wastegates on more tuned engines with more power.

Gary

[Asad]

i thinks you are confuzlicated my friend, cars which have a turbo all have a wastegate and its optional to have dump valve to make that noise when you change gear...again only on turbo cars a NA engine cannot have a dmp valve neither a wastegate

[ToyotaTech15]

ye i no that only turbo cars can have a dumpvalve lol,

i didnt no that all turbo cars had a wastegate inside the turbo,

i thought it was a choice between and dumpvalve or wastegate didnt no you could have both

Gary

[Asad]

Yup can have both + they are no where near each other dump valve sits on top and is attached to a vacume pipe thingy , n as for the waste gate you can have a external or internal?? (im a noob when it comes to turbo lingo) but i think most people go for the external?

[ToyotaTech15]

cheers mate that has helped alot,

im just not very clued on turbo engines lol just wanted more info before i put mines in.

understand now thou

Thanks

Gary

[Asad]

your welcome mate......

P.s any new on the engine? jimbos getting it in isn`t he?

[WallaceGlanza]

The wastegate is what controls the level of boost the turbo generates, if you look at the exhaust side of the turbo theres the exhaust wheel and the hole with the flap over it, that hole is the wastegate of the internal type. The boost is controlled by the actuator holding the wastegate flap closed until a set pressure is reached where the flap is opened so the exhaust gas bypasses the turbine wheel, the actuator then modulates the amount the flap is opened by to control and hold the boost level.

An external type wastegate is generally used when running high boost levels or when more precise control over the boost is required. With these the internal wastegate is welded shut and an external wastegate is piped off from the exhaust manifold with the boost level controlled by a spring in the external wastegate.

A dump valve is used to release the pressure from the intercooler piping when the throttle body is closed and either has a diaphragm or spring which sets the pressure at which it opens or dumps the pressurised air from the pipework.

[paul w]

Wastegate

http://en.wikipedia.org/wiki/Wastegate

The wastegate is the lil flap to the right in the top picture as found in a CT9 turbo.

Dump valve

http://en.wikipedia.org/wiki/Dump_valve

[ToyotaTech15]

cheers peeps,

helps alot, what happens if the pipe for the dump valve on the intercoolers(well the one on an hdi cooler) is blocked off, will it just run with the internal wastegate on the turbo?

Gary

[WallaceGlanza]

The dump valve and waste gate aren't connected at all, as standard there is only an internal wastegate. If you don't run with a dump valve the pressurised air will be pushed back out the air filter via the turbo creating the chatter noise. I get a bit of a chatter and a dump with my SARD dump valve.