Worst thing I have ever heard! Welded wastegte!
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Worst thing I have ever heard! Welded wastegte!
As in, welded shut!
Take into consideration that the guy I am talking about has very little experience, so its really not his fault, he was guided through this, as we all were once.
So the guy in question was asking me questions about his set up and he was telling me he wanted a map for 10 and 15PIS on his turbo. So I ask him what kind of turbo he plans on using, and he tells me that a guy sold him a stock TII turbo with a welded shut wastegate!!
First off, running over 12 PSI with the stock turbo is not recommended, and second, there is no way to control your boost if the wastegeate is welded shut.
What should this guy do iyo. Ask for his money back, or unweld the wastegate?
And can you guys name me every possible outcome of a welded wastegate? And what will end up in turbo failure. Its to back me up, because I am the only one telling him this... I will use this thread as a "wake up call" if the seller says I am telling BS.
Thank you.
Spec.
Take into consideration that the guy I am talking about has very little experience, so its really not his fault, he was guided through this, as we all were once.
So the guy in question was asking me questions about his set up and he was telling me he wanted a map for 10 and 15PIS on his turbo. So I ask him what kind of turbo he plans on using, and he tells me that a guy sold him a stock TII turbo with a welded shut wastegate!!
First off, running over 12 PSI with the stock turbo is not recommended, and second, there is no way to control your boost if the wastegeate is welded shut.
What should this guy do iyo. Ask for his money back, or unweld the wastegate?
And can you guys name me every possible outcome of a welded wastegate? And what will end up in turbo failure. Its to back me up, because I am the only one telling him this... I will use this thread as a "wake up call" if the seller says I am telling BS.
Thank you.
Spec.
#3
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FWIW, racers do and have done this to reach boost levels that aren't easily attainable by regular wastegate operation. Tricks like using pressurized C02 to hold the diaphram shut are among the many methods.
But on a setup that will actually be driven, this wouldn't work. There would be no way to control boost and it would simply ramp up indefinetely.
But on a setup that will actually be driven, this wouldn't work. There would be no way to control boost and it would simply ramp up indefinetely.
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Leah Dizon > Roast Beef
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FWIW, racers do and have done this to reach boost levels that aren't easily attainable by regular wastegate operation. Tricks like using pressurized C02 to hold the diaphram shut are among the many methods.
But on a setup that will actually be driven, this wouldn't work. There would be no way to control boost and it would simply ramp up indefinetely.
But on a setup that will actually be driven, this wouldn't work. There would be no way to control boost and it would simply ramp up indefinetely.
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Engine, Not Motor
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Turbos with wastegates welded shut just use the old "right foot boost control".
Back in the day, especially from American cars, it was common to see turbo systems lacking a wastegate altogether.
Now as far as doing this in an FC, that's just plain crazy. The stock turbo is very small and will make astronomical boost levels if the wastegate is welded shut. The result will be massive boost spikes (assuming an unrestricted intake and exhaust) to 20 PSI or more, with the predictable outcome of turbo and engine destruction. At those levels the turbo is pushing more heat then air anyway.
Depending on how it was welded shut, it may be easily reversible. If it was just tacked, then the tacks can be cut. If it was fully welded it may need to be cut out completely and then repaired. Might be cheaper/easier to just replace the hotside.
Back in the day, especially from American cars, it was common to see turbo systems lacking a wastegate altogether.
Now as far as doing this in an FC, that's just plain crazy. The stock turbo is very small and will make astronomical boost levels if the wastegate is welded shut. The result will be massive boost spikes (assuming an unrestricted intake and exhaust) to 20 PSI or more, with the predictable outcome of turbo and engine destruction. At those levels the turbo is pushing more heat then air anyway.
Depending on how it was welded shut, it may be easily reversible. If it was just tacked, then the tacks can be cut. If it was fully welded it may need to be cut out completely and then repaired. Might be cheaper/easier to just replace the hotside.
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#12
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I'm guessing external wastegates are used primarily because of flow advantages over internal wg's and so that you might not have to mess with the turbo itself if the wg breaks in any way. As far as any turbo needing an external wg, I wouldn't think so (I do understand that many turbos simply don't have an internal wg so yes they need an external wg, but if they all did have internal wg's I would think an external would be more beneficial for the above stated reasons)
#13
Crash Auto?Fix Auto.
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As mentioned an external gate has a few advantages mainly flow, being that you can place an external gate in the optimal position.
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Leah Dizon > Roast Beef
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I'm guessing external wastegates are used primarily because of flow advantages over internal wg's and so that you might not have to mess with the turbo itself if the wg breaks in any way. As far as any turbo needing an external wg, I wouldn't think so (I do understand that many turbos simply don't have an internal wg so yes they need an external wg, but if they all did have internal wg's I would think an external would be more beneficial for the above stated reasons)
#15
Crash Auto?Fix Auto.
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Its just another design, there's drawbacks and upsides to either, and either if executed properly can work as well as the other.
#18
pretty much I was going to use a stock turbo and weld the wastegate shut, so I can use an external. I heard that those were better than internal and also, it would be better positioning for me than the internal, being that I have an N/A. Im my opinion welded shut would be fine if you use and external, but running without a wastegate is insane.
#20
rotorhead
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meh, friend of mine welded the wastegate shut on his Big 16G turbos on his Vr-4 because it wouldn't hold over 22psi. He had racegas in there and a decent enough tune that it was fine.
I had my wastegate not open on my T2 and it only hit 16psi or so, but the turbo was on its last legs anyway.
I had my wastegate not open on my T2 and it only hit 16psi or so, but the turbo was on its last legs anyway.
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Leah Dizon > Roast Beef
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I think this mod is more about staying within a competitive class or withinn a budget then actual performance.
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Unless the person is paranoid, and wants to run a 10~12psi external wastegate and be SHURE it functions correctly?
Through I do think that would be too much $$, work, and effort since the stock one seems to function fine for a LOT of people if you just port it a little.
Through I do think that would be too much $$, work, and effort since the stock one seems to function fine for a LOT of people if you just port it a little.
#25
if he's set up for 12psi and his WG doesn't open for whatever reason and he spikes to 16 psi then your motor goes out the window. Most people are inattentive when they drive to begin with and driving like that is like playing Russian roulette.
Will you be looking at the guage when it spikes and lift off in time or will you blow the motor?
Turbo failure would be number three on the list of problems. If you don't wanna blow the money on a hybrid then I'd suggest you unweld it.
Will you be looking at the guage when it spikes and lift off in time or will you blow the motor?
Turbo failure would be number three on the list of problems. If you don't wanna blow the money on a hybrid then I'd suggest you unweld it.
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