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Efficient Performance - The Engine Design Challenge

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koolkei

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Post Fri Apr 01, 2016 3:49 am

Re: Efficient Performance - The Engine Design Challenge

my 128 score engine.

and HOW THE FUDGE do you get 30+ efficiency with 0 quality?
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phale

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Post Fri Apr 01, 2016 4:02 am

Re: Efficient Performance - The Engine Design Challenge

-15:1 air-fuel mix, obviously

-Smallest possible turbine
-low boost (~0.6 bar)
-Compressor size matched to turbine and boost for optimum efficiency

-Ignition timing optimized for efficiency (~60-80, it depends)
-Careful VVL tuning (35 first, ~70-90 second)
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koolkei

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Post Fri Apr 01, 2016 4:54 am

Re: Efficient Performance - The Engine Design Challenge

did all that.

but i found out that sometimes looking for something a little bit more effective in making power ends up making slightly higher score. i mean i got 28-29% easily, but the performance is just shit. and isn't higher boost means slightly higher efficiency? im on roughly 0.7-0.8 bar.


i'm not the greatest at making the most efficient engines, but i'm pretty good at making an efficient overall car
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phale

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Post Fri Apr 01, 2016 5:28 am

Re: Efficient Performance - The Engine Design Challenge

Boost efficiency depends on the compressor size. When reducing boost starts reducing efficiency, lowering compressor size will increase efficiency (up to a point). Then you should be able to lower boost again. Less boost gives more octane to use for compression ratio. I basically start with the economy preset and then make it more efficient, lol. Also for more power raise A/R.
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UMM

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Post Fri Apr 01, 2016 12:21 pm

Re: Efficient Performance Engine Leaderboards

phale wrote:
UMM wrote:Here's my take on a small I4 NA engine :)

Feel free to comment.

Score: 80.3


You're on the leaderboard ;)

Since the equation weights efficiency so heavily though, I think you can do better with a more efficient engine.


I can probably squeeze a little more efficiency out of that engine, but not with that bhp i think. Also i have the redline at 8500RPMS and top bhp at 8300RPMS which hurt the reliability a bit. But i think thats more realistic then have the redline at the same RPM as the top bhp.

Let's see what other people came up with, a go from there ;)
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strop

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Post Fri Apr 01, 2016 4:23 pm

Re: Efficient Performance - The Engine Design Challenge

Wow. I suck at maxing the efficiency quotient. I was able to get 37%, but the performance sucked, so I'm only reaching turbo scores of 120 or so. Guess that's what I get for using the turbo solely for performance applications!

That said I do enjoy building eco hypercars, but they do require a fair bit of tech pool, especially on injectors.
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USDMFTW

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Post Fri Apr 01, 2016 11:40 pm

Re: Efficient Performance - The Engine Design Challenge

Spent about an hour on this one.
Score = 154.196

Screenshot (57).png
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strop

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Post Fri Apr 01, 2016 11:59 pm

Re: Efficient Performance - The Engine Design Challenge

Yo, isn't your AKI rating too high? It's max 95RON!
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Manche

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Post Sat Apr 02, 2016 1:01 am

Re: Efficient Performance - The Engine Design Challenge

I was getting a 108 aprox with a turbo mOHV v8

I rated higher in a 7.3 v12 twin turbo but I believe I discovered that large engines are still at a disadvantage in this challenge
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phale

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Post Sat Apr 02, 2016 1:19 am

Re: Efficient Performance - The Engine Design Challenge

Well, I think V engines are at a disadvantage due to their high frictional losses. I'm not sure but when I build V engines they either perform poorly at low rpm (hurting economy) or at high rpm (hurting power). It's harder for me to get the nice torque curves I get with inlines.
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USDMFTW

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Post Sat Apr 02, 2016 9:29 am

Re: Efficient Performance - The Engine Design Challenge

strop wrote:Yo, isn't your AKI rating too high? It's max 95RON!


Curse the different measurements, scored dropped a little.

149.06

Screenshot (58).png
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phale

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Post Sat Apr 02, 2016 11:22 am

Re: Efficient Performance - The Engine Design Challenge

Wow! That's really impressive! Care to share any special tips? (I want this challenge to be as much about learning and sharing knowledge as it is about showing off :D )
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UMM

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Post Sat Apr 02, 2016 12:23 pm

Re: Efficient Performance - The Engine Design Challenge

Another take, this time a 1.6L

Score: 90.1
Image
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phale

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Post Sat Apr 02, 2016 12:57 pm

Re: Efficient Performance - The Engine Design Challenge

Looks like you're knocking in that screenshot - some further tweaks to ignition, compression and cam timing should make it even better!
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MrChips

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Post Sat Apr 02, 2016 2:12 pm

Re: Efficient Performance - The Engine Design Challenge

Sure, I'll give this a shot!

Image

A naturally-aspirated engine good for a score of 91.507.
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