An interesting power curve
Posted: Tue Jul 28, 2015 10:11 pmSo 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?
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An interesting power curve
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Posted: Tue Jul 28, 2015 10:11 pmRe: An interesting power curve
Posted: Wed Jul 29, 2015 1:47 amOut of curiosity what's your cam set at?
Re: An interesting power curve
Posted: Wed Jul 29, 2015 4:10 amProbably 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?
Also I see your AFR is 10, you're not running rich though are you?
Re: An interesting power curve
Posted: Wed Jul 29, 2015 7:36 amHis 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.
Re: An interesting power curve
Posted: Thu Aug 27, 2015 4:01 pmstrop 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
Re: An interesting power curve
Posted: Thu Aug 27, 2015 4:47 pmThat'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:
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?
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 (792.72 KiB) Viewed 8075 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?
Re: An interesting power curve
Posted: Wed Oct 28, 2015 9:31 amSpeaking of undrivable engines....
- 2015-10-27_00002.jpg (326.56 KiB) Viewed 7676 times
Re: An interesting power curve
Posted: Wed Nov 04, 2015 11:27 amAwildgermanappears wrote:Speaking of undrivable engines....
How on earth...
Re: An interesting power curve
Posted: Wed Nov 04, 2015 12:32 pmsmall turbo that spools quickly then loses power and a high cam to step into after the turbo.
Re: An interesting power curve
Posted: Thu Nov 05, 2015 12:19 pmnialloftara 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.
Re: An interesting power curve
Posted: Sun Dec 13, 2015 11:26 amPeople 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?
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?
Re: An interesting power curve
Posted: Sun Dec 13, 2015 11:54 amLol I see what you did with the boost there.
Re: An interesting power curve
Posted: Sun Dec 13, 2015 12:34 pmHow big is that turbo?
Re: An interesting power curve
Posted: Mon Dec 14, 2015 12:46 amCompressor 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
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
Re: An interesting power curve
Posted: Sun Dec 20, 2015 12:04 pmAwildgermanappears wrote:Speaking of undrivable engines....
Well done. You have won. Claim your award.