Info on wastegate

[1996Dizzum]

Okay i'm a newb and have searched but cannot find the exact answers I am looking for. I have a 2ga gsx and I wanted some info on wastegates. Do they come stock on the car? If so, internal or external?

 

[GSXSixteenG]

If the car is completely stock it will be internally gated.

 

[DSM nOOb]

Any car with a turbo must have a wastegate, well unless it is a vvt turbo but thats besides the point.

The stock wastegate on your car is an internal.

 

[1992_Talon_tsi]

A wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharged engine system. Diversion of exhaust gases regulates the turbine speed, which in turn regulates the rotating speed of the compressor. The primary function of the wastegate is to regulate the maximum boost pressure in turbocharger systems, to protect the engine and the turbocharger. These cars comes from factory internally gated so its a big yes they do come with internal wastegate, external wastegates are commonly used for regulating boost levels more precisely than internal wastegates in high power applications, where high boost levels can be achieved.

 

[1996Dizzum]

so what about the 16g's or 20g

 

[LiquidX]

First, assuming you have a stock turbo, find your turbo. Next, you will see a can like piece of metal bolted (should be) to the turbo with a nipple on the one end (hopefully connected to a vacuum line) and a rod coming out of the back. That is called the wastegate actuator. Follow the rod and it should connect to a piece of metal on the turbine (hot) side of the turbo. That piece of metal the rod connects to is called the wastegate flapper and on the inside is just a basically a swinging door that is held shut by the wastegate actuator rod.

That kind setup is an internally gated turbo as the wastegate is inside of the turbo and ALL MHI turbos are internally gated unless modified to use an external gate.

External gates are the big round/square/parallelograms () that are either connected somewhere along the exhaust manifold or are ON the o2 housing. TiaL is a very big name for external wastegate. In a nut shell it's a much much more compact version of the internal gate but in it's own enclosure .


Both setups require air pressure and springs to operate the movement of the actuator diaphragm which controls the opening or closing of the flapper or valve. Air pressure enters into the diaphragm area and builds pressure until it overcomes the force needed to compress the spring. Compressing the spring will either more the actuator arm (internal gate) or open the valve (external gate). The opening is what regulates how much gas travels over the turbine which stops the build up of PSI. This is why on your boost gauge the needle doesn't (it shouldn't) keep moving after a set spot.


A boost controller (manual or electronic) is the same concept of a wastegate however it is a valve in which air pressure is blocked from entering into the actuator diaphragm until certain criteria are met. MBC are when the air pressure is large enough to overcome the spring in its own assembly and THEN the air travels to the wastegate which is usually a lower spring pressure. Thusly allowing you to build more boost before the wastegate opens and diverts exhaust away from the turbine.


Hope this information help you out

 

[1992_Talon_tsi]

so what about the 16g's or 20g

Just like LIQUIDx said all MHI turbos are internally gated, although they could be machine and modified, then all you would need its a manifold with external wastegate adaptation (pretty expensive), anyways you could still modified the stock exhaust manifold to an external wastegate although iv only seen it around here in one guy. By the way i love the noise external wastegate makes, music to my ears . Ok so just to make sure you got it im going to hook you up with two pics i found.


The internal gate is located to the right of the turbine wheel, but built into the turbine housing.

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On left, an example external wastegate. Partially visible is the shaft of the poppet valve built into the wastegate.

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[1996Dizzum]

Wow, thank you so much haha. So this is a manual boost controller, correct? You've told me what it's used for but how do you use it, turning it to + or -.. Is it attached to the actuator?

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thank you guys so much for not being d*cks I hope to be the same when i'm, hopefully, as knowledgable

 

[1992_Talon_tsi]

Wow, thank you so much haha. So this is a manual boost controller, correct? You've told me what it's used for but how do you use it, turning it to + or -.. Is it attached to the actuator?

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thank you guys so much for not being d*cks I hope to be the same when i'm, hopefully, as knowledgable

Before installing this little toy if i was you i would definitely get an aftermarket boost gauge. Ok back to the manual boost controller, is installed with one vacuum line coming from the intake somewhere after the turbocharger, and one vacuum line going to the wastegate actuator. The tighter the spring the more boost it will produce, how you know how much boost did you gained or lost? Thats what the boost gauge will help you to know.

 

[1996Dizzum]

Thanks a bunch guys, couldn't have been better.

 

[myaceofdiamonds]

the boost controller goes in a vaccume line from the intake to the wastegate nipple,(I like to run mine from the intake manifold nipple). look on your boost controller there should be a inlet side and outlet side, plug your vaccume line on the inlet port coming from your intake, then run the outlet line onto the nipple on your wastegate. start with the boost controller turned all the way to the negative(allowing your wastegate to operate under normal boost to keep from overboosting your engine), afterward turn to the positive about half a turn (or a couple clicks depending on the controller) drive your car building max boost and repeat the process till you reach your desired max boost pressure.

You would do well to make sure your boost does not go too high so a aftermarket boost gauge would be a must. and know that anytime you turn up boost past factory specs you run the risk of damaging your engine. double check all and enjoy!!