ACC The 2.4hrs of Spa Special - Saturday 1st April 2023

[SwannyUK]

Hello everyone,

@SwannyUK I told you I'm out because of diner at restaurant, but if I can make it and connect on the server just in time for the race (but skip practice and quali), will I be authorized to join ?

21:30 CEST is something that can work for me maybe so...

This is a good question... With a longer race, there might be more disconnect mishaps and a chance to fight back for a good result.
Will there be reconnections allowed during the race?

https://streamable.com/4vi3kr (Mention to last race with @rborowik, video by @sebastalona)

I think for this race we'll allow re-connects due to the length of the race. If you know you are going to join late please use a default in game livery to limit any lag.

 

[McFlunch]

Thanks for the answer Chris !
Anyway, I'll let you know here or on discord if I can join or definitely not.

 

[mklengel]

Do we have a full formation lap?
How long are the pitstops? Fixed time, e.g. 30 secs?

 

[SwannyUK]

Do we have a full formation lap?
How long are the pitstops? Fixed time, e.g. 30 secs?

Short formation lap, free to do what you like with pit stops currently.

 

[mklengel]

Short formation lap, free to do what you like with pit stops currently.

I never though about strategy because there was never a race that long with me in the car

The time needed for refuel and new tires is 30 secs. According to my experiments I need for a pit stop (including refuel and tire change) 92 secs in Spa. I expect 60 laps for our race.

If my assumption is right the strategy is not complicated (with the M4, 120l max fuel).

a) one pit stop, ~6% fuel saving, lap time may be 2:22 (1) - 2:23 (2)
b) two pit stops, no fuel saving, lap time may be 2:21 (1) - 2:22 (2)

a1) 60 x 2:22 + 92 secs = 8612 secs
a2) 60 x 2:23 + 92 secs = 8672 secs
b1) 60 x 2:21 + 2 x 92 secs = 8644 secs
b2) 60 x 2:22 + 2 x 92 secs = 8704 secs

Of course I have to check what to do (Engine Map) to reach 6% fuel saving and check the lap time.

What do you think? Am I correct with my calculation? Is 6% fuel saving realistic with another Engine Map?

 

[SwannyUK]

I never though about strategy because there was never a race that long with me in the car

The time needed for refuel and new tires is 30 secs. According to my experiments I need for a pit stop (including refuel and tire change) 92 secs in Spa. I expect 60 laps for our race.

If my assumption is right the strategy is not complicated (with the M4, 120l max fuel).

a) one pit stop, ~6% fuel saving, lap time may be 2:22 (1) - 2:23 (2)
b) two pit stops, no fuel saving, lap time may be 2:21 (1) - 2:22 (2)

a1) 60 x 2:22 + 92 secs = 8612 secs
a2) 60 x 2:23 + 92 secs = 8672 secs
b1) 60 x 2:21 + 2 x 92 secs = 8644 secs
b2) 60 x 2:22 + 2 x 92 secs = 8704 secs

Of course I have to check what to do (Engine Map) to reach 6% fuel saving and check the lap time.

What do you think? Am I correct with my calculation? Is 6% fuel saving realistic with another Engine Map?

Enter @sebastalona to confirm or deny (we won't look mate, your secrets are safe with mklengel - this is a secure line)

 

[SwannyUK]

Enter @sebastalona to confirm or deny (we won't look mate, your secrets are safe with mklengel - this is a secure line)

Looks like it adds up to me anyway fella, I've got a feeling it's going to be max attack from us McLaren boys if you guys can stretch it that far.

 

[mklengel]

Enter @sebastalona to confirm or deny (we won't look mate, your secrets are safe with mklengel - this is a secure line)

No secrets

 

[akephoe]

The strategy for this Event could be very interesting. The distance of 144' is on the edge between 1 or 2 stops, depending on car and map Mode. I did some short testing with different cars and still not sure what to do. It could be very very close between both options. A big factor also is the tyrewear and the ability to push or safe tyres. Really like this format.

 

[JohannS]

My biggest concern with a single pit stop strategy is the accelerated time. Keeping the tyres in a manageable window will be very tough. I also would need to stay in map 2 in the merc (3.4l per lap) for the majority of the race. Still debating whether to try it or not

 

[rborowik]

The factor to remember if your aiming to stay on the lead lap is work out if the leader can force an extra lap or not. Easy to run out of fuel if they manage to do it, it happens on Monza a lot in the public lobbies.

Depending on pace it could be as much as 63 laps I think!

That would mean that the BMW could use 3.67L per lap and still have a single lap in the tank as a safety based on a single stop with two full tanks of fuel. Just then comes down to running an average of 2.19 per lap and keeping the tyres. Unlikely to see the pace that hot for the whole race but the numbers make it possible

 

[mklengel]

I think I will choose the 2 pit stop strategy or maybe there is a car which needs less fuel and has the driving wheel on the right (=left) side

 

[akephoe]

I love those things, so here some data from me.

My math is:
we have 2.4hr racetime, this are 144minutes or 8640sec.
With a 2 Stop strategy you loose ~90sec per stop, so 180 sec for 2 stops in the race.
This results in 8460sec. for the netto racetime with 2 stops.
With a laptime of 2:19(139sec) you get ~60.86 laps,
with 2.19.5 (139.5)sec. ~60,65 laps
and with a 2.20.0 (140sec) ~60.42 laps.

Now the 1 stopper math.
With the one stop way, you loose 90sec with the pistop, results in a netto racetime of 8550sec.
To match the 2 stopper with the 2:19 laptime you have to do a 2:20.48 lap in average to be even at the finish,
for the 2 stopper 2:19.5 you need a 2:20.95
and for the 2 stopper wit a 2:20.0 you need 2.21.50 to match the 2 stopper time/laps.

So, when you compare the 1 to 2 stopper laptimes you can see that you need around 1.5sec a lap to be faster with 1 stop against the 2 stopper, or you can be those 1.5 sec a lap slower than the 2 stopper with 1 stop.
In reality you need to be a bit faster in laptimes when doing 1 stop because you need some time as a buffer for the end. The 2 stopper will have fresher tyres and maybe better working tyres because they can adapt the tyre pressures 2 times.
The 1 stopper has more fuel load in general, means more tyre wear, so they will suffer at the end of their stints more than the 2 stoppers.

So far from my short testing of some cars, i see 2 cars that can to the race with 1 stop and not much or any fuel saving.
All the other cars will have to do more or less fuel saving which results in more pace loss per lap for the 1 stopper.
My conclusion? I don't know yet. For me it depends on if i can get a decent setup for a 1 stopper car to be fast and consistent and safe.

All this is theory.
If you do any faults duríng the race, suffer in traffic etc. all will be reshuffled one or the other way around.

But as i said before, i love those longer races because to the pure speed there comes another part to think about.

 

[Jan Larsen]

As a general, how much do we need to raise the pressures at the pitstops? 0.3psi or something?

 

[RicardoJorge92]

As a general, how much do we need to raise the pressures at the pitstops? 0.3psi or something?

I'd say that it will depend on how they are dropping and how far into the night you are. The aim is to keep them at 27.7

 

[SwannyUK]

As a general, how much do we need to raise the pressures at the pitstops? 0.3psi or something?

General rule of thumb is add 0.1 for each 1 to 2 degrees C of temp drop

 

[RicardoJorge92]

General rule of thumb is add 0.1 for each 1 to 2 degrees C of temp drop

On the last Spa race the temperature dropped quite a bit.
What I did was that I looked at what the pressures were on the last few laps, and knowing that temps were only going down, I added up whatever pressure was missing to achieve the ideal.
Worked well for me.

 

[mklengel]

I love those things, so here some data from me.

My math is:
we have 2.4hr racetime, this are 144minutes or 8640sec.
With a 2 Stop strategy you loose ~90sec per stop, so 180 sec for 2 stops in the race.
This results in 8460sec. for the netto racetime with 2 stops.
With a laptime of 2:19(139sec) you get ~60.86 laps,
with 2.19.5 (139.5)sec. ~60,65 laps
and with a 2.20.0 (140sec) ~60.42 laps.

Now the 1 stopper math.
With the one stop way, you loose 90sec with the pistop, results in a netto racetime of 8550sec.
To match the 2 stopper with the 2:19 laptime you have to do a 2:20.48 lap in average to be even at the finish,
for the 2 stopper 2:19.5 you need a 2:20.95
and for the 2 stopper wit a 2:20.0 you need 2.21.50 to match the 2 stopper time/laps.

So, when you compare the 1 to 2 stopper laptimes you can see that you need around 1.5sec a lap to be faster with 1 stop against the 2 stopper, or you can be those 1.5 sec a lap slower than the 2 stopper with 1 stop.
In reality you need to be a bit faster in laptimes when doing 1 stop because you need some time as a buffer for the end. The 2 stopper will have fresher tyres and maybe better working tyres because they can adapt the tyre pressures 2 times.
The 1 stopper has more fuel load in general, means more tyre wear, so they will suffer at the end of their stints more than the 2 stoppers.

So far from my short testing of some cars, i see 2 cars that can to the race with 1 stop and not much or any fuel saving.
All the other cars will have to do more or less fuel saving which results in more pace loss per lap for the 1 stopper.
My conclusion? I don't know yet. For me it depends on if i can get a decent setup for a 1 stopper car to be fast and consistent and safe.

All this is theory.
If you do any faults duríng the race, suffer in traffic etc. all will be reshuffled one or the other way around.

But as i said before, i love those longer races because to the pure speed there comes another part to think about.

For safety reasons I calculate with 62 laps and this is the ranking for a 1 stop strategy.

Update: I had wrong max fuel data in the first version. Should be correct now.

Car	Fuel Saving [%]
Bentley Continental GT3 2015	4
Porsche 991 GT3 R	3
Nissan GT-R Nismo GT3 2015/2018	0
AMR V8 Vantage GT3	10
BMW M6 GT3	12
McLaren 720S GT3	15
AMR V12 Vantage GT3	3
Porsche 991 II GT3 R	12
Bentley Continental GT3 2018	14
Audi R8 LMS Evo II	10
Ferrari 488 GT3/488 GT3 Evo	5
Mercedes-AMG GT3 Evo	13
BMW M4 GT3	6
Honda NSX GT3 Evo	7
Lamborghini Huracan GT3 Evo	9
Lexus RC-F GT3	14
Emil Frey Jaguar G3	13

 

[SwannyUK]

I'm driving flat out until my car starts making a spluttering noise then I might think about stopping for some juice

 

[Andrew Sebastian]

I'm driving flat out until my car starts making a spluttering noise then I might think about stopping for some juice

I’ll be Fred Flintstone-ing it for the last lap!