Assetto Corsa Round 2 Magny Cours

Ken Jagger · Aug 3, 2024

Philipp Pichler said: ↑

In the end, it comes down to math and everyone can use tools (CBV fuel calc for example) respectively calculate that by yourself.
But be careful, fuel calc adds two extra litres by default and calculates the distances on basis of your laptime.
For example, 45 divided by 1.([1,66667*the decimal digit of your average lap time]) is not accurate for the race distance, you need a projectory of the leaders average laptime.
For my avg. laptime, it was 45/1.([1,666667*49]) so circa 24.7 ~ (you need always round up, because they will not stop midways in the final lap) 25 laps (even with the slower first lap and some mistakes, but you need to be prepared for the worst case anyway) but because I knew the leaders is usally 4-5 seconds per lap faster in the race, it changes to 45/(1.[1,66667*44]) = 25.9 ~ 26. So now fuel tank size divided by 26 and thats the fuel number you need to hit on average each lap. 55 (it might be, if I remember correctly) / 26 are 2.1153... litres.
As said, if you are way slower than the leaders, you can take into account, that you will not do the full distance. I calculated with being 5 seconds slower per lap on average, which means I will lose 130 secs total to the leader. The projected average lap time of them was 104 seconds, so I was pretty confident, I will get lapped around lap 20 or so. Therefore my number was 2.2 litres per lap.

Regarding the time loss by pitting, I looked at Joses and Kais timeloss during in and outlap in Grobnik, which was roughly 40 seconds. Which means, if you lose less than 1.5 sec per lap by saving fuel, not stopping is faster. In my case, I lost in practise around 1 seconds per lap. But my calculation was flawed (the leader was slower and I was faster) and I did not hit my number accurately in the infight with Kai/Phil (was 0.5 litres short for 25 laps). By running out of fuel I lost at least seven seconds more than 40 seconds, so it is a fine margin. But that would not have changed my position in the end result. Do better management go with a more conservative fuel number. could have changed it to the better.

In short, if you want to keep it simple and be on the save side, do a fuel stop
Click to expand...

Errrrr....what??

Roy Cop · Aug 3, 2024

Philipp Pichler said: ↑

In the end, it comes down to math and everyone can use tools (CBV fuel calc for example) respectively calculate that by yourself.
But be careful, fuel calc adds two extra litres by default and calculates the distances on basis of your laptime.
For example, 45 divided by 1.([1,66667*the decimal digit of your average lap time]) is not accurate for the race distance, you need a projectory of the leaders average laptime.
For my avg. laptime, it was 45/1.([1,666667*49]) so circa 24.7 ~ (you need always round up, because they will not stop midways in the final lap) 25 laps (even with the slower first lap and some mistakes, but you need to be prepared for the worst case anyway) but because I knew the leaders is usally 4-5 seconds per lap faster in the race, it changes to 45/(1.[1,66667*44]) = 25.9 ~ 26. So now fuel tank size divided by 26 and thats the fuel number you need to hit on average each lap. 55 (it might be, if I remember correctly) / 26 are 2.1153... litres.
As said, if you are way slower than the leaders, you can take into account, that you will not do the full distance. I calculated with being 5 seconds slower per lap on average, which means I will lose 130 secs total to the leader. The projected average lap time of them was 104 seconds, so I was pretty confident, I will get lapped around lap 20 or so. Therefore my number was 2.2 litres per lap.

Regarding the time loss by pitting, I looked at Joses and Kais timeloss during in and outlap in Grobnik, which was roughly 40 seconds. Which means, if you lose less than 1.5 sec per lap by saving fuel, not stopping is faster. In my case, I lost in practise around 1 seconds per lap. But my calculation was flawed (the leader was slower and I was faster) and I did not hit my number accurately in the infight with Kai/Phil (was 0.5 litres short for 25 laps). By running out of fuel I lost at least seven seconds more than 40 seconds, so it is a fine margin. But that would not have changed my position in the end result. Do better management go with a more conservative fuel number. could have changed it to the better.

In short, if you want to keep it simple and be on the save side, do a fuel stop
Click to expand...

I see a flaw in your calculation.
The projected average lap was 1.46.5, so 106.5 seconds. No idea how you got the 104 result.
Then I question why the fuel usage of someone who is "slower" would differ from the leaders. Let me clarify this.
Let's say a "fast" driver uses knows how to short shift and/or lift and coast. The "slower" driver doesn't. In this case the "fast" driver will be able to cover more distance per liter of fuel.
Now let us turn this around. Say the "fast" driver is fast because he revs the engine higher and brakes later than the "slower" driver. The "slower" driver is using the short shift and/or lift and coast tactic. In this case the "slower" driver will be able to get more laps out of the full fuel tank.
In AC there is no correlation between slow and fast drivers. The fuel usage is calculated using the following formula
(rpm*gas*CONSUMPTION)/1000 litres
So as everyone will drive the same(isch) distance each lap the fuel consumption should be about the same for everyone if they follow the same tactic.
You could argue that one would ad the usage of the extra time it takes the slower driver to finish the lap, but that is compensated by the fact that the slower driver will not reach the high rpm as the faster driver would.

Anyway, when I race in my League and people ask me how much fuel they'll need I'm always spot on.

An easier way to know your personal fuel usage is to use Ptracker. Once you've done 5+ laps it will give you a correct number of laps you can do with the fuel you have.

Kiril Kirilov · Aug 3, 2024

My summary will be short but meaningful:
Average lap time over 45min: 1:46.2 (only 0.1s from my qualifying lap!)
Consistency: 99.58
Fuel left at the finish line: 0.1l
And still no chance for 1st place...
That's how good Roy is. Respect and congrats again! And really fairplay from all those who were lapped.

Philipp Pichler · Aug 3, 2024

Roy Cop said: ↑

I see a flaw in your calculation.
The projected average lap was 1.46.5, so 106.5 seconds. No idea how you got the 104 result.
Click to expand...

The 1.44 (104 secs) lap time from the fastest guy was just a guess. I was aware of the Seat Leon Series that were run in the past, and from what happened in Grobnik (1.29.8 was improved to 1.28.0), I thought the 1.47.9 from 2018 could well be improved by 2-3 seconds. Per se not an issue to be over-optimistic here. But as said, the whole thing backfired because of my thought, that getting lapped is guaranteed - which would automatically mean I have to drive a lap less distance than the lead cars. So, no - I do not think, being slower is automatically more fuel efficent. We all saw in Grobnik that it is the other way round, but there I was lapped way before the very last lap. So thats where this came from.

Thanks for the hint with ptracker, I forgot about that. Lets see if that helps to have a less flawed calculation next time.

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Assetto Corsa Round 2 Magny Cours

Ken Jagger Administrator Staff Member Donator

Roy Cop Pro Driver

Kiril Kirilov Pro Driver

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