Rate My Engine 1.2L Eco Turbo

[nialloftara]

KD14 what happens if you bump your exhaust up to 2 or 2.25 inch? That turbo must be choaking on that tiny pipe.
Edit* I'll be throwing my hat in the ring tonight around midnight gmt.

[Irkie500]

Maybe he kept it that small for better back pressure and a faster turbo spool?

I will test both engines when I get home tonight and report back with the results, I am curious as to how this plays out.

[KD14]

KD14 what happens if you bump your exhaust up to 2 or 2.25 inch? That turbo must be choaking on that tiny pipe.

You Judge it by looking at the photo? download the engine and try it yourself

[nialloftara]

Well your screenshot was taken after switching from exhaust to test so its still in the info bar, I will try out my own version tonight as I'm at work right now.

[KD14]

Good, so you can see that its power limit is just fine
When you design an engine to be economical, you want the exhaust power limit to be as close as possible to the maximum engine power potential, even a bit lower.

[nialloftara]

Except as far as I remember turbos work differently in regards to back pressure. N/A gains power and economy from a more restrictive system where as turbos benefit from a more free flowing system. Unless I'm wrong in that.

[KD14]

Why talk when you can show results, just download my engine and try it!

[nialloftara]

Once more, I will once I'm out of work and at my computer, which will be about midnight gmt.

[Irkie500]

Here is my revision.

I changed it to Dual Overhead Cam, 5 valves per cylinder, and fiddled with the cam and timing. Came up with more power and a nicer curve for both HP and TQ. Should make a nice little engine. I will compare the two next in my test sedan.

Automation Launcher_2014_05_28_16_50_26_530.jpg (1.28 MiB) Viewed 5070 times

[nialloftara]

Okay here's my take, most efficient engine here at %32, turbo spools at 2700rpms and it's got a nice flat torque delivery until the horsepower is peaked, gear shifts should not be a problem as they ought to drop you back to the top of the torque curve. Also with no quality sliders it's quite quick and cheap to build.

[Irkie500]

I think if I kept the fuel ratio at 14.7 instead of 14.5 i could havw gotten higher efficency but 2% equates to a few mpg. I opted for a bit higher power output but it seems out engines are similar.

[nialloftara]

Oh I thought eco was the important part, but if it's power you want...

[USDMFTW]

Isnt the point of a small car engine to be inexpensive, why run on higher octane fuel that cost as much as 30 cents more per gallon?

[nialloftara]

Check the units, it's 91 ron, that's regular gas, our 86.4

[USDMFTW]

Check the units, it's 91 ron, that's regular gas, our 86.4

Lol, my bad. I still stand with my 35% fuel econ rating .