BRC 1966 - Gentleman Brobots Club [RACE 6 P&Q]

[Denta]

thanks guys, now waiting for tyre wear calculation

[Packbat]

power and economy charts.png (87.91 KiB) Viewed 5337 times

• Convert peak power to kW at 1 hp = 0.7457 kW if necessary. (In this case, 158 hp = 117.8 kW.)
• At peak power RPMs (i.e. the same position on the horizontal axis), estimate the position of the fuel economy line between the gridlines of the economy graph. (In this case, about two-thirds of the way up.)
• Interpolate using the numbers on the left side of the chart. These numbers are always measured in g/kWh, even when the number on the chart is lb/(hph), as here. (In this case: 650-350=300, 2/3*300=200, 350+200=550 g/kWh.)
• Multiply the numbers together to get kilograms. (In this case: 1.5 h * 117.8 kW * (550 g/kWh / 1000 g/kg) * 0.75 = 73 kg.)

I think you can get the footprint of the car from the chassis morphing tab (edit: nope - you have to make a new car with the same body and measure it that way - it's the first and third numbers, I think), but I keep forgetting and looking for it in the .lua file instead. (If you're using feet, 1 sq. ft. = 0.093 sq. m.)

[07CobaltGirl]

And what is "r" again?

1.5 hours
182.8kW
~600 g/kWh
134 width x 233 wheelbase?

[Packbat]

"r" is the fudge factor. It varies a lot based on factors I haven't nailed down, and it definitely varies based on track.

• A car which is on the high end relative to my formula would use something like 0.61 on ATT (a low-consumption track) and 0.75 on Norisring (a high-consumption track).
• The median car uses from 0.52 (ATT) to 0.64 (Norisring).
• The low-fuel car uses from 0.44 (ATT) to 0.53 (Norisring).

What I did was design around r = 0.75 with the assumption that I'll be using 20% less than that on ATT.

Edit: Is it wheelbase or total vehicle length? I thought it was total vehicle length.

[07CobaltGirl]

I thought so too, but the only "length" I can find is WheelBaseLength=233.05786895751953. I also found this:

  Code:

FootPrint={
      164.06199645996094,
      412.8040771484375

EDIT: OK, I have it now. 1.64m x 4.13m x 7 = 47.4 which means I have 47.4kg capacity in my fuel tank?

[Packbat]

Yeah, that sounds right. And if I'm running the numbers correctly, total race fuel consumption is 123.3 kg - so two stops.

[07CobaltGirl]

Yeah, I think I have it now. Thanks for explaining it so I could understand. I've never really thought about it this deep before.

[Packbat]

Glad to be of service! Just wanted to reduce the guesswork going into the process.

[Der Bayer]

Results are delayed as I found another small issue which needs fixing first. Maybe during the weekend then.

[Packbat]

Aaagh!

Better to fix the bug than display misleading results, though. Thanks for the heads-up.

[NormanVauxhall]

I can sleep now. Don't worry and do your best

[koolkei]

yay. at least my car can make the pre-season test then.

[Speedemon]

Can you provide a link to the high quality essentials mod pack?

[Packbat]

High Quality Essentials. It's on the Steam Workshop - if you go to Automation's Workshop page and click on "Collections", it's generally near the top.

[Speedemon]

For some reason the BRCtool cannot find the trim I want to use. I am getting confused and annoyed.