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See this turbo housing ? This is the exhaust side

zedhousing.jpg

See the little circular flap and actuator arm - this and example of an internal or integral wastegate - In other words, it's integrated into the exhaust housing

Here's another pic of a housing with an internal gate

3040turbo2.jpg

Internally gated turbo's require an actuator to open the gate:

InternalWgtAct-225225.jpg

This next pic is an example of a turbo with an external gate

soarerturbokit.jpg

The wastegate is mounted on the exhaust manifold.

Here's another

r33turbokit.jpg

TIAL46-225225.jpg

The actuator is built into the external gate.

A wastegated turbocharger includes an integral device to limit turbo boost. This consists of a pneumatic actuator connected to a valve assembly mounted inside the turbine housing. By connecting the pneumatic actuator to boost pressure, the turbo is able to limit its maximum boost output. The net result is increased durability, quicker time to boost, and adjustability of boost.clear.gif

What's the difference between internal and external wastegates?

Internal wastegates are comprised of a flapper door which is built in the turbine housing, usually operated pneumatically by a mechanical actuator. These flapper doors are limited in size, but work well in certain applications. Usually found in smaller turbos, internal wastegates are relatively inexpensive, simple in design, and very durable. Larger turbo can be fitted with internal wastegates, but boost control can be tricky. If you are looking to run high boost (20+ psi) all the time, then an internal gate may be fine. If you are looking to run lower boost levels, you will need an external wastegate.

External wastegates are generally mounted to the exhaust manifold or to the O2 housing, and are self contained units. External wastegates have the ability to bypass large amounts of air, and can provide steady boost control at any pressure level. A common myth is that in order to run higher boost pressures, you need a larger wastegate. This is incorrect. Larger wastegates are necessary to run low boost levels on large turbos.

What's the difference between internal and external wastegates?

A common myth is that in order to run higher boost pressures, you need a larger wastegate. This is incorrect. Larger wastegates are necessary to run low boost levels on large turbos.

so would it hurt to put a large waste gate on a small turbo?

One thing is that large high mount external gate turbos are hardly stealth installs.

Pop the bonnet and everyone, esp. cops will know the car is 'off its teats'.

Also I note that many people love the high mounts and big gates so that they can run a screamer pipe that is also illegal.

But to make serious hp - say around 300rwkW, you pretty much need an external gate system.

T.

Ditto Abo.

Thanks B-Man :D

Is their a recommended brand/model or are all the Japanese brands similar in quality/performance ?

Ben, I have never heard a bad report on the performance of an external gate - they are pretty simple devices. (yet expensive)

Known Brands are:

Trust / GReddy

TIAL

TurboSmart

HKS

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