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

[07CobaltGirl]

I think I will let my two-stop strategy stand. 1.66 tanks of fuel is high enough usage to justify making the 2nd stop for me to lighten the racing weight. Assuming the race is on Saturday again, I have at least one day to change my mind, right?

[Packbat]

...so, like, this is actually something I've been thinking about a lot in terms of my own race strategy - if I were going for a two-stop strategy instead of a one-stop strategy (and if I were designing a strategy for every race individually instead of a general strategy that should work for all the races), I would:

• Calculate what race percentage would correspond to 20 kg of fuel and measure backwards from the end in that percentage intervals to come up with the scheduled pit stops. (This ensures that the car will only take 20 kg at each stop - and therefore will always be done refueling by the time the tyres are changed.)
• Calculate what race percentage I could complete on a single tank, and set the replace-regular-stop interval as wide as possible while still allowing me to make it to the next stop or the end on a full tank.
• Calculate tyre wear at 40% of total race distance and set strategy to pit in when fastest-wearing tyres reach that percentage. (40% is basically a compromise between "replace tyres at one-third!" and "give yourself as much chance as possible to have the regular irregular stop replaced with a weather- or damage-based stop".)

For this race for me, that would be 21% for less-than-20-kg (so scheduled stops at 58% and 79%), almost 65% race distance on a tank (so replace regular stops within 79-35=44% of total race distance), and 'irregular' stops for tyres at 13% tyre wear (which should come at ~38% total race distance).

But I'm not doing that because (a) I would have to recalculate everything for every race and (b) I don't think it's worth the loss of time from the extra pit stop.

[koolkei]

Second Place?
Who said FWD is not feasible for a race car!

NISSAN DID!
or they just didn't put enough uumph into it.
good for you though

Oh heck yes. Dry-race prediction based on practice is 83 laps for the leaders and final standings Pyrlix first, mattmr2 second, and me third.

(That said: it'll be wet. I have no idea how that will change things - although I did quite well in the rain at Silverstone.)

(Also, race strategy could/will play a big part. Keep an eye on koolkei, for instance.)

why me????
that said. i've noticed that extremely aggresive pit stop strategy seems to favor rain. heavy rain or storm preferably.
which is good news for me for the next race

@der bayer: if i didn't send a new strat. you're gonna assume im using the last race strategy right? because i think i remember that my car was pitting quite late last race, even when set to pit at 65% of the race.

[Der Bayer]

Der Bayer, would you prefer for us to send you the files for the strategy, or to send you the numbers to alter?

I prefer the *-Info.lua file.

@der bayer: if i didn't send a new strat. you're gonna assume im using the last race strategy right? because i think i remember that my car was pitting quite late last race, even when set to pit at 65% of the race.

Yes, I will take the strategy I already have if I don't get a new one. Your pit stop is currently set up at 75% (not 65%), that explains why it is so late.

[koolkei]

ohhhh....... so that explains a lot...... nevermind this bit. i wanna keep it on 75% for the next race.


i just finished watching the qual....

9th! w-w-w-wh-what? huh? i never tuned my car to be good at such a small track.
then again, i was 28th in practice? someone explain to me this magic O_O
but my tire wear seems to be higher this time around.

9th place, 80% rain chance, nice pit stop setup. there's only 2 ways this is gonna go down. im gonna finish in the top 7 or im not gonna finish at all.

[07CobaltGirl]

ohhhh....... so that explains a lot...... mind changing it to 65% der bayer?
thank you very much sir


i just finished watching the qual....

9th! w-w-w-wh-what? huh? i never tuned my car to be good at such a small track.
then again, i was 28th in practice? someone explain to me this magic O_O
but my tire wear seems to be higher this time around.

9th place, 80% rain chance, nice pit stop setup. there's only 2 ways this is gonna go down. im gonna finish in the top 7 or im not gonna finish at all.

The "magic" is 55.8kg of fuel during practice and probably less than 3 (.68kg/lap) in qualifying. So you practice with more fuel than nearly everybody else, and qualify with less fuel than most.

[koolkei]

so purely the weight alone is the magic? O_O
55.3kg fuel tank and .68kg/lap and 2.2kg of fuel during qualifying.
i really didn't think i would've gained that much just by fuel load.

this may be time to rethink my strategy.... especially on rain.

[AirJordan]

Thank you, Der Bayer, for providing the CSVs! I went ahead and entered everyone's fuel tank size to do some automated full-race calculations.

That's really generous, thanks Pacbat

[Packbat]

@AirJordan: You're welcome! I was thinking of doing this earlier, but when Der Bayer issued the .csv exports, it became too easy not to do.

(Also, race strategy could/will play a big part. Keep an eye on koolkei, for instance.)

why me????
that said. i've noticed that extremely aggresive pit stop strategy seems to favor rain. heavy rain or storm preferably.
which is good news for me for the next race

Aaand that's why you. I remember what happened at Silverstone.

so purely the weight alone is the magic? O_O
55.3kg fuel tank and .68kg/lap and 2.2kg of fuel during qualifying.
i really didn't think i would've gained that much just by fuel load.

this may be time to rethink my strategy.... especially on rain.

Bear in mind: "that much" is only 0.41 s/lap. You may gain a little by stopping earlier and starting with less fuel - if you're taking tyres (10-15 s), going from 3.2 kg refueling (1.6 s) up to 20 kg (10 s) is free, and going from 20 kg to 30 kg (15 s) is half price - but it's not necessarily obvious that that's the right call.

[koolkei]

@packbat
oh cmon it was only 6th place

well it seems that with my strategy so far, i never needed to refuel more than 25kg per stop so it doesn't matter that much.
even if it does matter, and you've realized this, but the time spent on the pit lane is longer than that. the time spent actually stopping may only be like roughly 35-55% of the time to go to the pits depending on the pit lane length. which is why i'm sticking with 1 stop only strategy no matter what. except for damages. yeah you better come in for damages.

i prefer to pit as late as possible, because at that point, i a) only need to refuel a little, which also means b)shorter pit times c) most of the competitor don't have tires as fresh d)more time spent on less fuel in the tank + fresh tires late game = $$$profit$$$

[Packbat]

@packbat
oh cmon it was only 6th place

...from a qualifying position of 24th. And you qualified 9th here. I stand by my answer.

[squidhead]

Well, having done the analysis of the previous race, I don't feel like I need a strategy change. I need nobody to crash into me

[DeusExMackia]

Looking at those Best Lap times, there are just over 3 seconds between the fastest 10 and slowest 10.

This is gonna be a close race. And with everyone that close, there could be even more crashes than usual!

[Packbat]

Ooh, here's an interesting experiment I just did looking at the Snetterton race footage:

• Recorded lap time on the lap before I pit in.
• Recorded lap time on the lap I took my pit stop (which, because my box was before the start/finish line, included the full stop).
• Recorded Sector 1 time on my out lap.
• Recorded Sector 1 time on the lap after.

Going by those figures, navigating pit lane - in other words, the part of the pit time that BROBOT does not record - was only about 14 seconds for me.

That number is going to vary by car and vary by track, but for pit strategy planning, it's probably more accurate than just guessing.

[RocketplaneRacing]

Comparing my fuel consumption at Silverstone in the wet to practice, I'm 75% sure that I can get away with no stops in the wet at Knockhill. However, if I wanted to change tires during an emergency fuel stop, how would I go about that? Could I put my regular stop at 101% race distance and set the replace stop to within, say, 50% of scheduled stop? In that case would I take the fuel I need and change tires as necessary.

By the same token, I would only be taking maybe 5-8kg of fuel, so that would be a 4s stop, much lower than the 10-15s for tires...