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An interesting power curve

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dayhat

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Post Tue Jul 28, 2015 10:11 pm

An interesting power curve

So i was just messing around with engines and then all of a sudden theres this strange power curve change i noticed. Any one else get things like these?

Image
just alittle one more click *entire engine implodes on itself and makers*
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nialloftara

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Post Wed Jul 29, 2015 1:47 am

Re: An interesting power curve

Out of curiosity what's your cam set at?
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strop

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Post Wed Jul 29, 2015 4:10 am

Re: An interesting power curve

Probably your turbo is very small? It seems to run out of boost very quickly. Either that or the game decided to change your intercooler (it does this at certain displacement thresholds) and that changed your boost profile significantly.

Also I see your AFR is 10, you're not running rich though are you?
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nialloftara

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Post Wed Jul 29, 2015 7:36 am

Re: An interesting power curve

His intercooler is still green so its not restricting the flow, and only his compressor is red so I'd guess a small compressor, larger turbine paired with a highish (70-90) cam profile and very large exhaust diameter cause that little up swing to his power band at the redline.
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dayhat

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Post Thu Aug 27, 2015 4:01 pm

Re: An interesting power curve

strop wrote:Probably your turbo is very small? It seems to run out of boost very quickly. Either that or the game decided to change your intercooler (it does this at certain displacement thresholds) and that changed your boost profile significantly.

Also I see your AFR is 10, you're not running rich though are you?

not rich but the game flipped out and i had to reinstall do i dont have it anymore
just alittle one more click *entire engine implodes on itself and makers*
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strop

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Post Thu Aug 27, 2015 4:47 pm

Re: An interesting power curve

That's ok, after I saw your last post, I decided I'd boot up the public build and see for myself what was going on.

Took me a few minutes to realise it wasn't a large turbine, but a high AR ratio that was derestricting flow through the turbine:

funnyturbo.png
funnyturbo.png (792.72 KiB) Viewed 7954 times


Obviously not exact replica of the values earlier, but a close enough demonstration of what really happened. Derestrict the turbine flow too much, and the engine runs rich. Also, while the net effect is very little, raising the boost limit damages the engine, probably because of the pressures running through the compressor not being relieved by the wastegate?
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Awildgermanappears

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Post Wed Oct 28, 2015 9:31 am

Re: An interesting power curve

Speaking of undrivable engines....
2015-10-27_00002.jpg
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Vri404

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Post Wed Nov 04, 2015 11:27 am

Re: An interesting power curve

Awildgermanappears wrote:Speaking of undrivable engines....


How on earth...
Salt is what 95% of children are made from, and generally 72% of forum users.

Also 82% of statistics are made up.
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nialloftara

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Post Wed Nov 04, 2015 12:32 pm

Re: An interesting power curve

small turbo that spools quickly then loses power and a high cam to step into after the turbo.
Chief designer and CEO, Centauri motor works, Centauri Performance Vehicles (CPV)
"Centauri: The Stars Are Within Your Reach."
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Awildgermanappears

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Post Thu Nov 05, 2015 12:19 pm

Re: An interesting power curve

nialloftara wrote:small turbo that spools quickly then loses power and a high cam to step into after the turbo.

Interestingly enough this was on default settings with a journal bearing turbo but with the boost cranked up to octane limit. Once I selected ball bearings it went to a generic torque curve like any other.
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iRaptor

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Post Sun Dec 13, 2015 11:26 am

Re: An interesting power curve

People were whining about not having some constant torque flow.

Well. Our company boss yelled "Sauerkraut".
He went to do the design by himself.

And we have a very large boat...I mean car engine, with "constant" torque from 1000-5000 RPM.

Because why the hell not?
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More to be announced very soon.
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strop

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Post Sun Dec 13, 2015 11:54 am

Re: An interesting power curve

Lol I see what you did with the boost there.
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squidhead

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Post Sun Dec 13, 2015 12:34 pm

Re: An interesting power curve

How big is that turbo?
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iRaptor

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Post Mon Dec 14, 2015 12:46 am

Re: An interesting power curve

Compressor 90.0 mm
Turbine 99.0 mm
AR Ratio 1.15
Max boost 1.24 bar

Max boost doesn't matter at that stage as the setup doesn't allow the turbo to fully spool.
But hey people will stop whining about not having a flat powerband :P
Lefatti Automobili : viewtopic.php?f=35&t=4421&start=10
---------------------------------
Lefatti Automobili - Car Company
Scirocco by Lefatti Automobili - Racing Department

More to be announced very soon.
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rileybanks

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Post Sun Dec 20, 2015 12:04 pm

Re: An interesting power curve

Awildgermanappears wrote:Speaking of undrivable engines....
2015-10-27_00002.jpg

Well done. You have won. Claim your award.
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viewtopic.php?f=35&t=4994
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