Heres a picture of the stock wastegate, that big thing connected to your turbo isn't the wastegate, just the wastegate actuator. That door is the actual wastegate which opens and closes via the WGA arm which is in turn controlled by boost pressure.
Thats an internal wastegate. An external one is the same but routes it to the atmosphere instead of back into the exhaust right before the o2.
This post helped me understand it a lot more... WGA as wastegate actuator, while the wastegate is actually internal... VERY interesting...
This post helped me understand it a lot more... WGA as wastegate actuator, while the wastegate is actually internal... VERY interesting...
Exactly, Some vendors will remove that door, weld it closed and smooth out that flow area. Then slap an external wastegate door on the other side of the turbofold. If you want to see an external one go look at the site of a vendor that offers that, I don't remember what vendor does it, I think realtune. External is far superior though.
Anybody have a picture of an external wastegate that used to be an internal wastegate?
Thanx all. I really understand how it works now. Im glade other people we able to learn a thing or two as well. The only part im still confused about is, how a adjustable WGA will help to increase/hold boost. does it put more or less tension on the WGA spring?
So the pressure in the exhaust has nothing to do with when the WG opens right? If anything it would look like the more pressure in the exhaust will help keep it closed. or no?
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So would it be ideal to get a adjustable WGA or just stick with the stock one and go with EBC or just use both in conjunction with eachother for optimised boost control. Is there a benefit to having both or just a failsafe. Or does it just depend on the tuner? BTW great thread very informative.
P.s. Sorry if i rose this thread from the grave.
-Greg
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so when you floor it and the turbo spools the wastegaste is closed to allow the boost and when you let off it opens to stop the boost?
close, but not exactly correct.
when the target boost pressure is met, the wastegate opens to release exhaust gasses. on an external, dumped wastegate car its really obvious when the gate is open and closed.
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so when you floor it and the turbo spools the wastegaste is closed to allow the boost and when you let off it opens to stop the boost?.
it opens when the spring inside the waste gate experiences the same amount of pound rating that the spring is made to. (if that makes anysence) its like having a 200 lbs person holding a door shut, then comes along a 201 lbs person and pushes it open. the 200 lbs person can no longer keep the door shut because it is just not strong enough. the 200 lbs person is the what the WGA spring would be. the door is the waste gate and the 201 lbs person is like the amount of boost your running.
it opens when the spring inside the waste gate experiences the same amount of pound rating that the spring is made to. (if that makes anysence) its like having a 200 lbs person holding a door shut, then comes along a 201 lbs person and pushes it open. the 200 lbs person can no longer keep the door shut because it is just not strong enough. the 200 lbs person is the what the WGA spring would be. the door is the waste gate and the 201 lbs person is like the amount of boost your running.
correct me if i am wrong
essentially yes. thats how spring boost works.
when you use a boost controller, you're bleeding off boost that goes to the wastegate. so it might take 25 psi of pressure to equal 20 at the wastegate, if that makes sense.
when you use a boost controller, you're bleeding off boost that goes to the wastegate. so it might take 25 psi of pressure to equal 20 at the wastegate, if that makes sense.
that makes perfect sence. but looking at the pic of a bc in the first page, how does it bleed the extra boost out?
that makes perfect sence. but looking at the pic of a bc in the first page, how does it bleed the extra boost out?
that picture describes a ball-spring manual boost controller.
a bleed type will vent some pressure to adjust how much the wastegate sees. think of it this way...drink some soda through a straw, no pop a small hole in the straw (a "bleed"), it takes more work to accomplish the same task. the turbo must create more pressure to overcome the "leak" and obtain the spring pressure of the wastegate.
What makes an external so much better, just cleaning up the flow of the exhaust?
When the exhaust flow through the wastegate meets up with the rest of the exhaust flow it creates a lot of turbulence. You can control your boost pressuree alot better with an external gate too, no massive spikes and more boost to redline.
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