Guys, I am curious as to turbo setups. Most are internally wastegated. But I saw a non wastgated turbo on a troll at landcruiser mountain. Couldn't get any info from them (quite arrogant really).
So my question is, obviously boost would be controlled by fuel. The more fuel, the more boost?????? To what extent is not having a wastegate not a good idea? When boost is over ?psi, or should control boost from within the cab some how?
And how would that be done (of course a gauge is a start)??????
If anyone has pic's of this with an explanation, it would really help? my curiosity!
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Help needed with non wastegated turbo.
turbos work off motor load .... eg. more throttle open in congunction wit a certain will load turbo more and give you shove in the back feeling everyone loves... without wastegate the turbo would overboost the motor to point it would cause serious damage... external wastegates are for high flow big power jobs mostly..... aas they are generally larger than builtin internall ones... thats my understanding of it anyway
Ok, please don't think I'm being rude. And please don't think I'm being arrogant.
There was NO external wastegate on this motor. I saw it run, I heard it run, I smelt it run. It was definately a diesel. Oh, and many trucks run turbo's without a wastegate.
So I know you can have an external wastegate. But please read the first post.
There was NO external wastegate on this motor. I saw it run, I heard it run, I smelt it run. It was definately a diesel. Oh, and many trucks run turbo's without a wastegate.
So I know you can have an external wastegate. But please read the first post.
i know what you mean in regards to this, my dads TD42 with aftermarket turbo has a kit with no external wastegate, and no internal wastegate,
it can only boost till 11psi, now im not 100% sure on this, but i would say it has to do with impeller designs more than anything else,
i dont think more fuel would change it, as it will only spin as fast as the exhaust gasses allow it,
no i do knot that my turbo if i disconnect the wastegate i get about 25psi,
im hoping someone can chime in with more info
it can only boost till 11psi, now im not 100% sure on this, but i would say it has to do with impeller designs more than anything else,
i dont think more fuel would change it, as it will only spin as fast as the exhaust gasses allow it,
no i do knot that my turbo if i disconnect the wastegate i get about 25psi,
im hoping someone can chime in with more info
I suppose the turbos flow and compressor/turbine efficiency would be limiting the boost, as ozy1 says when he removes the wastegate line he gets 25psi, thats the point where his turbo becomes inefficient enough so that the volume of air flowing through the turbine(exh) doesn't spin the shaft and hence compressor wheel as fast as it should for the given airflow.
Just thinking about how it works if you had a turbo with better efficiency at high flow range (and capable of more boost) you would use a wastegate to limit boost and therefore have a lot less restriction in the system at high revs.
I had a car - petrol that ran a turbo with an external wastegate that was stuffed - effectively jammed shut and it peaked at about 22psi - hard to keep fuel up, and hard on motors, would have been a lot more durable limited to about 15 or so.
Just thinking about how it works if you had a turbo with better efficiency at high flow range (and capable of more boost) you would use a wastegate to limit boost and therefore have a lot less restriction in the system at high revs.
I had a car - petrol that ran a turbo with an external wastegate that was stuffed - effectively jammed shut and it peaked at about 22psi - hard to keep fuel up, and hard on motors, would have been a lot more durable limited to about 15 or so.
There are no stupid questions, but there are a LOT of inquisitive idiots
Trucks have a small rev range ie; 1800-2200rpm max so proberly cannot reach an over boost condition. Trucks are aso designed with a constant load application.monkeycritter wrote:Ok, please don't think I'm being rude. And please don't think I'm being arrogant.
There was NO external wastegate on this motor. I saw it run, I heard it run, I smelt it run. It was definately a diesel. Oh, and many trucks run turbo's without a wastegate.
So I know you can have an external wastegate. But please read the first post.
A motor that will rev much higher can over speed the turbine hence needing a wastegate to dump exhaust flow and preasure.
i agree with your comments, so non wastegated turbos are designed to only produce a set amount of pressure,nastytroll wrote:Trucks have a small rev range ie; 1800-2200rpm max so properly cannot reach an over boost condition. Trucks are also designed with a constant load application.monkeycritter wrote:Ok, please don't think I'm being rude. And please don't think I'm being arrogant.
There was NO external wastegate on this motor. I saw it run, I heard it run, I smelt it run. It was definitely a diesel. Oh, and many trucks run turbo's without a wastegate.
So I know you can have an external wastegate. But please read the first post.
A motor that will rev much higher can over speed the turbine hence needing a wastegate to dump exhaust flow and pressure.
NOTE: found this small bit of tech,
From a technical standpoint, there would be no performance advantage to a non-wategated turbo. Simply because the non-wastegated turbo would have to be designed for lower pressures, in order to prevent an over boost condition. Whereas a wastegated turbo could be designed to move more air, with the wastegate preventing over boost.
See, now my concern was from run on. I have seen the brother in laws hilux, when he had no oil catch can, and the turbo leaked oil, it ran on, all the way to 8500 ish!
It wouldn't shut down and had to stand on the brakes with the hadbrake. He reckon's it went like a v8, from where I was standing, behind him, it went like a rocket! Lots of smoke though.
Now I can see sense in truck using it, as they also have different goveners! But couldn'r for the life of me see this patrol had no wastegate, I can see no performance gain, but couldn't figure why?
It wouldn't shut down and had to stand on the brakes with the hadbrake. He reckon's it went like a v8, from where I was standing, behind him, it went like a rocket! Lots of smoke though.
Now I can see sense in truck using it, as they also have different goveners! But couldn'r for the life of me see this patrol had no wastegate, I can see no performance gain, but couldn't figure why?
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