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my 128 score engine.

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

-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)

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

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.

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

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.

Spent about an hour on this one.
Score = 154.196

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

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

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.

Curse the different measurements, scored dropped a little.

149.06

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 )

Another take, this time a 1.6L

Score: 90.1

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

Sure, I'll give this a shot!



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