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Old 02-11-2020, 01:51 PM   #41
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Fuel quantity/rate certainly was not an issue. The point being as long as the turbine has sufficient power to run the compressor, altering the turbine flow by going to a different turbine housing had less than a 1% impact on power.
Bigger turbine side is used when you have maxed out smaller one, if not, you just lose power. So bigger housing needs more fuel.
 
Old 02-12-2020, 12:21 PM   #42
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Bigger turbine side is used when you have maxed out smaller one, if not, you just lose power. So bigger housing needs more fuel.
Your baseless generalized answers are confusing, apparently you are trying to convince yourself you are correct.
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Old 02-12-2020, 12:47 PM   #43
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Originally Posted by Leiffi View Post
Bigger turbine side is used when you have maxed out smaller one, if not, you just lose power. So bigger housing needs more fuel.
DUH. Of course you need a bigger turbine if you want more power when a smaller one is maxed out.
 
Old 02-12-2020, 01:55 PM   #44
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Your baseless generalized answers are confusing, apparently you are trying to convince yourself you are correct.
Correct about what ? It is just impossible to rule out all the variables in these tests, needs too much time and money. Every turbine, or whatever part, is best in certain combinations and setups.

There is some strange results, like bigger turbinehousing making less power at higher rpm, same power at lower rpm.
 
Old 02-13-2020, 01:43 AM   #45
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There is some strange results, like bigger turbinehousing making less power at higher rpm, same power at lower rpm.
It's only a 5 hp difference in that last pic, how much is that in percents, 1%? Might go inside the dyno accuracy etc.

Would be nice if someone made comparison of different turbo setups so that the engine control would keep EGT constant from e.g. 3000 rpm up. Or lambda constant through whole rpm range and EGT limiter at high rpm. That way we would see the true power potential of each setup.
 
Old 02-13-2020, 11:14 AM   #46
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It's only a 5 hp difference in that last pic, how much is that in percents, 1%? Might go inside the dyno accuracy etc.
That might be true.
 
Old 02-13-2020, 12:43 PM   #47
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There is some strange results, like bigger turbinehousing making less power at higher rpm, same power at lower rpm.
It's not strange at all, of course you would first need to understand how a negative sweep works.
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Old 02-13-2020, 02:59 PM   #48
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It's not strange at all, of course you would first need to understand how a negative sweep works.
Understand but we never do it because it is not real life. Should have no meaning to housing size.
 
Old 02-13-2020, 03:54 PM   #49
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Understand but we never do it because it is not real life. Should have no meaning to housing size.
It directly relates to real life specifically in a sled pulling application, and it very much has a meaning to housing size. I think you are mistaking your opinion for fact.
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Old 02-13-2020, 05:09 PM   #50
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Understand but we never do it because it is not real life. Should have no meaning to housing size.
Quote:
Originally Posted by Smokem View Post
It directly relates to real life specifically in a sled pulling application, and it very much has a meaning to housing size. I think you are mistaking your opinion for fact.
Not only sled pulling, but also working applications.

For example, a loaded semi on the road. When it hits a hill, what happens with rpm? Negative sweep.

So yes, a negative sweep on an engine dyno is very applicable. Probably more so than a chassis dyno that runs the rpm “up hill”.
 
Old 02-13-2020, 05:16 PM   #51
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It directly relates to real life specifically in a sled pulling application, and it very much has a meaning to housing size. I think you are mistaking your opinion for fact.


You need to ignore Leiffi, he is a euro troll that has never done anything performance related in his life. Bases his experience off what other people have told him. (I’m sure most of which was to get him to go away.) Totally doesn’t understand why certain engines are dyno’d in certain ways. Thinks acceleration or inertia dynos are the only true way to test, even if the engine being ran is used in a pulling application where the load is gradually increased. He’s a time vampire and will not bring anything useful to this or any other thread.
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Old 02-14-2020, 02:45 PM   #52
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I have a billet s480 race cover, t6 1.32 80/96/1.32 if anyone needs one.
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Old 02-14-2020, 09:10 PM   #53
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I have a billet s480 race cover, t6 1.32 80/96/1.32 if anyone needs one.
Try the for sale section 🙄
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Old 02-15-2020, 10:36 AM   #54
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Try the for sale section 🙄
He has 2 for sale ads, a trade ad, and every turbo thread covered
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Old 02-15-2020, 11:05 PM   #55
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He has 2 for sale ads, a trade ad, and every turbo thread covered
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Old 02-16-2020, 03:33 PM   #56
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Lots of usable turbine options coming from offshore.
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