Internal vs external wastegate

[just plain john]

OK guys, educate me. Is one style of gate better than the other? What's the difference in the two operationally?

 

[jasjamz]

lots of reading here
Here ya go...

 

[Nick Micale]

OK guys, educate me. Is one style of gate better than the other? What's the difference in the two operationally?

Like many questions asked here on the board, the question is so broad, a specific or simple answer is not feasible?

Many factors need to be considered, and lots of info is needed on your build, intended use, street/strip or both, competition or fun, and other parameters.

Oh, I do want to mention budget, as an electronic controller needs to be included with an external gate for optimum operation and control.

In general, the stock type will work fine into the nines, but for competition, I would draw the line into the 10's.

 

[Howling Mad]

lots of reading here
Here ya go...

Nice. Very nice

 

[WarWagon]

lots of reading here
Here ya go...

LOL haha:tongue::biggrin:

 

[gentek10]

lots of reading here
Here ya go...

What a jerk.. that's a good one...

 

[JayC]

lots of reading here
Here ya go...

Im glad you find that amusing. If you cant answer the question, stay out of the thread.

To the OP, it depends on what youre trying to do. Nick summed it up pretty nicely.

 

[gentek10]

Im glad you find that amusing. If you cant answer the question, stay out of the thread.

To the OP, it depends on what youre trying to do. Nick summed it up pretty nicely.

Sorry I offended you administrater

 

[jasjamz]

Im glad you find that amusing. If you cant answer the question, stay out of the thread.

To the OP, it depends on what youre trying to do. Nick summed it up pretty nicely.

Actually, it gave him more answers to his question than the thread has. Not to mention the in the past four years of him being a member and almost 1500 posts I'm sure a simple search would have gave him instant results. Wasn't intended to piss him off.
All the "stuff" I see fly on the board and you do nothing, now you're an issue of this.

 

[just plain john]

If you're referring to me jasjamz I did search, and there's page after page of threads. Just so you'll understand where I'm coming from, this is my first turbo build, and this board is where I get my only help. I bought a used ex gated downpipe and it's the only one I have so I'm going to use it, I was just hoping someone who actually runs one would speak up. In point of fact, most questions asked here are already archived on here. I didn't realize anyone would have an issue with any discussion of any topic that's TR related

 

[jasjamz]

WASTEGATE: In the most basic of terms, a turbo system is self-feeding. That is, as the system creates more boost it also creates more exhaust flow. This exhaust flow is what powers the turbocharger, so if left unchecked the turbo system will quickly spiral out of control. Now it takes time and a specific amount exhaust flow to start creating boost, but once this point is reached (called boost threshold), either exhaust flow to the turbine is regulated, or the system keeps building pressure until something gives, usually a hard part in the engine. Which is where the wastegate comes in.


Controlled by vacuum signal from the manifold (or more correctly, positive pressure in the manifold), the wastegate's job is to re-route exhaust flow around the turbine wheel to control boost levels. Remember, the turbo creates boost by extracting energy from exhaust gas flow, so this is the prime location to regulate turbocharger RPM, and therefore boost levels. What a wastegate does is provide an alternate path for exhaust gasses to flow through that doesn't cause them to contact the turbine wheel. This prevents the exhaust gasses from contributing to boost production, thus regulating boost to preset levels.


There are also two main types of wastegates, internal & external. Both are there to perform the same task, the only difference is location and effectiveness. Internal wastegates are located inside the turbine housing itself, and although effective at re-routing exhaust gasses around the turbine wheel, they can impart a good bit of turbulence to the exhaust flow path. This increases exhaust system pressure and hurts performance. The external wastegate, the true performance choice, has provisions made for it's mounting before the turbo on the exhaust manifold. An entirely alternate flow path is created where exhaust gasses skip going through the turbine housing altogether, contributing much less to turbulence in the system. They also tend to be more accurate at controlling exhaust flow and turbo boost; combine these two attributes and you have a recipe for superior performance.

Can you post a picture of what you have so we can be of more assistance. Yes ,I have ran an external deltagate before and went back to the internal setup. It gave me more issues that the internal setup. I have no need to adjust from inside the car. I tune it for a set amount and leave it there.

 

[DCVING 6]

Im glad you find that amusing. If you cant answer the question, stay out of the thread.

To the OP, it depends on what youre trying to do. Nick summed it up pretty nicely.

Not really directed at Jay but...

I have used google to search on here. If you include turbobuick.com in your search on google, under the first search result it will say "more results from Turbobuick.com". If you click that, it searches your phrase, but only on tb.com.

HTH

 

[Dynaflow]

Actually, it gave him more answers to his question than the thread has.

True...but more isn't necessarily better, especially with Google searches.

...a simple search would have gave him instant results.

Also true...but "simple" searches can have overwhelming/unwanted results. For some...asking is better...:smile:

 

[GNVYUS 1]

Ideally you'd run an external gate off the header and boost control would be most efficient and effective.

Since Buick, and most, car companies didn't design that into the vehicle you rely on the turbo's internal gate to do it, easiest, cheapest and pretty effective for most of us.

I wouldn't put any extra $ into a system that already probably works well for you, adding an external gate off the DP will for sure cost more, gate and DP, and could produce less desirable results.

If you want the best, order up a set of headers from Nick and ask him to put the wastegate flange under the turbo flange. But then the question is, "Do you really need this"? Up to you.

 

[williamsGN]

Have an external with an underdash mechanical dial control, PSI stays where I set it. Old set up with a dial control on an internal, the PSI would fluctuate with the outside temperature.

 

[just plain john]

Thanks for the help everyone. Here's the deal..I bought a stock motor and trans for my hybrid build (that's taken waaay to long to finish). I started following this board, and before long my simple drivetrain swap started morphing into a performance build. A downpipe upgrade was in the works and I heard good things about ATR. I found an externally gated dp here in the for sale section, so I bought it. I'm trying to dedicate more time to finishing the mechanicals, so I'll probably have more questions before in the not too distant future. Although I sold the original stock dp and cat (don't need it here in Texas if the vehicle is over 25 years old) I still have the internal gate and may go back to it if external gates are problematic. This is just a for fun car with maybe a few test and tune runs, but I don't plan to compete with it. Again, thanks to all for the input.