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Fuel affect nearly nonexistant?

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medal 5261
8 years 291 days ago
In todays race(ID 25) me and Dave both started on hard tires, but I had roughly 30kg's of more fuel. Our pace was practically even, which it usually is, which to me suggests that the affect fuel has on laptime is barely modeled. IRL 10kg's usually costs around 3-4 tenths per lap so I should have been considerably slower than him.
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medal 5164 FOUNDER & WEB DEV
8 years 291 days ago
I'm sure this is already modelled but for some time I have noticed the impact seems fairly negligible too. If this is increased then the performance of the hard tyre will probably need to be improved.

Logic: If people are on the hard tyre they are doing longer stints, if the fuel costs much more then they will be considerably slower, making hard tyres useless vs the softs which are already competitive and are usually combined with much lighter fuel loads.
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medal 5245
8 years 291 days ago
Perhaps then make the hards a bit faster on low fuel than they are currently? I think with such cold conditions as was today, the soft tyre should probably be the faster option, yet Jesse made the hard tyre work with an uber long first stint today.
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medal 5000
8 years 291 days ago
It is implemented, and from a quick test the difference between a full tank (240L) and near empty tank (10L) is about 2s a lap.  I can increase this easily if need be.
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medal 5037
8 years 291 days ago (edited 8 years 291 days ago)
According to my math then 10L is about ~0.084 sec per lap.

IIMHO is a bit too low and doesn't reward the risk to run on low fuel. In RL weight is everything and we see cars running on the lowest fuel possible.

Maybe the soft tires should last less time to make hard tires viable. In a 50% race I don't see any use of them and often I run on 1 pit stop strategy. Might be a different story for 100% race tho.
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medal 5164 FOUNDER & WEB DEV
8 years 291 days ago
Now at Istanbul the weight of the fuel for each lap is worth 8/100ths of a second of extra lap time, just under a tenth. So one kilo of fuel, which is what Vettel is supposed to have saved, would give him a speed disadvantage of 5/100ths of a second over Webber in pure fuel weight.

http://www.jamesallenonf1.com/2010/06/f1-strategy-cutting-it-fine-on-fuel/

I think we modelled it on this originally then reduced it. Anyway, according to this 1kg of fuel at Turkey was worth 0.05 per lap in 2010. Converting that to iGP litres gets us 0.0381s per litre in lap time.

This means, at Turkey, the difference of 230L in Andrew's example, should be a whopping 8.763 seconds per lap. So it's about 4 times too low at the moment. If we simulate this realistically the tyres will need to be revised completely too.
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medal 5037
8 years 291 days ago
Never implied it would be easy. :)
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medal 5164 FOUNDER & WEB DEV
8 years 291 days ago (edited 8 years 291 days ago)
I never implied it was too difficult. :P In fact, I have been tracking down as much data as I can since making that post because it needs to be revised before tonight's races if we want to have it properly tested by launch.

I've found a lot of information, including 2-3 credible sources that confirm the figures in my post above. Williams give a bunch of interesting stats on top of what we need, such as engine power loss (-6%). That might be useful for the future.

Anyway, I'm going to compile a document with all of the information we need to revise the simulation and forward it to Andrew. Hopefully it can be implemented in time for tonight's races.
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medal 5037
8 years 291 days ago
Keep up the good work.
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medal 5164 FOUNDER & WEB DEV
8 years 290 days ago
We spent a good amount of time testing this last night and balancing things to include the new fuel weight penalty, and it seemed to work quite well in every scenario we ran in the end. We also improved the balance of tyres across changeable weather conditions.

For the races tonight these new values should be implemented.
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medal 5021
8 years 290 days ago
A small suggestion from me.

Our fuel data consists of decimals too.I mean for a lap in x circuit it needs some thing like 3.2L(assume it).But we can put only units.I mean for doing 3 laps in that circuit it will require 9.6L.But we can enter only 10L.And by new fuel-lap time difference system it may affect a lot in doing longer stints.

And also I can't understand how drivers are quicker in race than Qualifying.Usually qualifying time will be much faster than race lap times in real racing.Then why not in iGP too?
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medal 5000
8 years 289 days ago
Part of the problem with qualifying times is that the tyres are starting cold.  There is no warmup lap for qualifying (nor for the main race obvioiusly). As a quick fix I can run qualifying with all tyre compounds closer to their ideal temperature.
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medal 5037
8 years 289 days ago
"Andrew
As a quick fix I can run qualifying with all tyre compounds closer to their ideal temperature.

It should depends on driver's skills... the better skills... the closer to ideal temperature... a lvl 1 driver should not qualify like a lvl 5 one...
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medal 5082
8 years 278 days ago
Just seen this now. Has the time lost by carrying excess fuel been adjusted?
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medal 5000
8 years 278 days ago
Jose, well the way it is set right now, all drivers will start off with their tyres at optimum temperature.  However during the lap, better skilled drivers will keep their tyres closer to ideal temperature than lower level ones.  You have a good point about how even the intial temperature should be based on their skill though.
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medal 5000
8 years 278 days ago
Gisty:  No, but I saw a thread title commenting on the effect of fuel weight so there may be a problem.  I'll respond in detail to that thread when I get to it...
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medal 5000
8 years 271 days ago
Is there also a data of fuel-tanking in seconds?

I mean if you tank 0L you would lose 0 seconds in the pit only for your tires.

so how many seconds do you lose if you tank 100L?

Further i have a missunderstanding with the fuel-reserve;

If you have 4 liter before a lap you go into the pit, if you have 0 after the last pit you would end without fuel.
But if i have 4 liters in a 3.2 lap my driver would pit so my question is:

In wilt (Fuel)lap would my driver pit?  Before the 4 or after the 4L?
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