Daytona 24h B2O team

[Slider]

Re: Daytona 24 B2O team?

Thanks Noodle, and yes Kyle. Considering everyone runs little different pace, I'll be running telemetry and fuelbuddy during my stints and look at data while spotting.

 

[Daunt]

Re: Daytona 24 B2O team?

Private test session full stint #1 (no draft whatsoever):

3.928 liters / lap
2.269 liters / min
Total used: 129.29 Liters
Total laps: 31
Stint time was 57.05 minutes.
Avg. lap time: 1:48 ish? (horrible - accounting for some time in pits, etc)
Fast lap time: 1:44.6 (Lap 12 of stint)

Tread remaining on right side front was 88/88/93
Tread remaining on left side front was 94/88/88

Tread remaining on right side rear was 86/86/91
Tread remaining on left side rear 94/87/87

Not the best stint overall for me. Avg laptime (that didn't involve a fuck up) was 1:45.1 and fastest was 1:44.6 The biggest factor on this seemed to be how well I could take turn 1. It would either be a great turn or I'd lose 2-3 tenths... there was almost no in between. Late in the stint my lap times dropped to mid to high 1:45s. I still struggle most in turn 5. Still at least 4-5 laps over the course of the stint that, through minor errors, costed me over 1-2 seconds. No spins or major incidents, but need to improve on that.

 

[Slider]

Re: Daytona 24 B2O team?

Take your fastest time and add 2-3 seconds to account for traffic and safer pace. That'd be a good endurance pace without pushing our luck and staying clear of crazies. First hour or two will be most critical.

 

[Daunt]

Re: Daytona 24 B2O team?

No doubt. Not trying to break speed barriers here. Just trying to see how fast I can go and still be very safe.

I did another stint. Gotten much faster, thanks to working on my turn 1 entry and exit as well as the biggest difference maker, the bus stop. You can really cut a decent amount off the exit, even putting 1/3 of the car onto the grass when entering back onto the oval.

Avg times are down to 1:44.7, fastest 1:44.3. Makes the tires a lot harder to drive so it's not the best idea for an endurance race to be that aggressive but its great practice.

 

[Steve7Plays]

Re: Daytona 24 B2O team?

Yeah my guess is that we all will have an average time of about 1:45-1:46 depending on GT3 and C7 traffic ofcourse.

Tyre wear is lower than I expected tbh. but your fuel consumption is interesting lower than mine... I use about 4 Liters/Lap but also was able to do 31Laps.

But there again Fuel consumption will again alter depending on the GT3 and C7 traffic especcially when you are behind other GT3's and are able to fuel save behind them.

Edit:

Okay, I did some pitstop testing and here are the results:
Full fuel tank + tyres are approx. 1min 6sec (stop only) driver change is 30secs on top so 1min 36sec stop, pit road is 20secs atleast on top.
I did some rough calculations wit a average lap time of 1:46.3 and a stint that is 31 Laps long.
So our race is 86400 seconds long 3381.3 seconds is 1 stint long ( pit time is in this calculation but without driver swap) which means we will have 25.55230.... stints, but ofcourse there is no damage in this calculation nor repairtime.
I personally think that we will have about 22 or 23 stints.

As said those are some very rough calculations

 

[Daunt]

Re: Daytona 24 B2O team?

Unless I'm mistaken, a driver change can be done while taking tires and fuel. So it shouldn't add any time to a stop

 

[Steve7Plays]

Re: Daytona 24 B2O team?

well idk how iRacing does it... if they do it like WEC then its while refueling. If it is like that then you are right.

 

[Noodleguitar]

Re: Daytona 24 B2O team?

Yes, you can do the driver change during the pit stop. Otherwise it would be silly, teams with 3 drivers would have much bigger advantage than teams with 7 drivers. Also, you'd be forced to make driver stints as long as possible to minimize switches.

Nice info Kyle, that was very good on your tires.

Here are my tire stats after a full stint last night (default weather with low or moderate rubber):


Note that we made a little change to the right-hand pressures because of the nature of the track. They might even have to go up to 190 kPa.

 

[Steve7Plays]

Re: Daytona 24 B2O team?

I would also post some tyre info from my stints but its silly cause I am not using your guys setup

 

[Slider]

Re: Daytona 24 B2O team?

Kyle, closer I am to the race, more time I'm having freed up for the race, so I'll be there to jump in if needed.

 

[Noodleguitar]

Re: Daytona 24 B2O team?

That schedule works for me.

Couldn't resist

 

[AbbyTheFoxx]

Re: Daytona 24 B2O team?

I'm EST btw, not CST

 

[Noodleguitar]

Re: Daytona 24 B2O team?

Download OBS and record locally with it Noel, it's free.

I've got it to detect iRacing but when I try to record the result is horrible. The sound records fine but the video is a still image most of the time with occasionally some motion desynchronized from the audio.

I've tried varying the bit rate from 1000 to 5000 but that didn't seem to help. The videos are also quite small, no larger than 30 MB.

In the mean time, I did save a replay of a 1:43.5 lap. This was done on race fuel in default weather and 35% starting track state.
View attachment Daytona_McLaren_1.43.476.rpy

No iSpeed for this unfortunately. I was running it but it doesn't save the laps during a test session.

 

[Steve7Plays]

Re: Daytona 24 B2O team?

Noel OBS already pre renders the video thats why the videos of OBS are small. ahm what settings did you choose on the Boradcast Settings? CPU Speed ( fast,veryfast etc.) better give us a screenie of it.

 

[Noodleguitar]

Re: Daytona 24 B2O team?

I have done a first version of a rough fuel calculation for the race, which can be found here:
https://docs.google.com/spreadsheets/d/1r7ZVLfEP8l6q9YkAS4ZrmCELXjLobDrgct4fqSnUyBc/edit?usp=sharing

It was constructed based mostly on Kyle's data but I'm not sure if the lap time is correct (also depends on the weather).

You can see that there are three charts. The first one lists the fuel strategy when the tank is filled on every pit stop. It lists at what time you have to pit, the estimated pit-in lap, the pit stop duration (excluding pit road) and how much fuel is added.

The second chart is basically the same, except the total fuel that we need for the race is distributed over all pit stops, creating similar stint lengths throughout the race. The starting fuel is still a full tank.

Then the last chart shows a fuel-saving strategy based on a desired amount of pit stops. I did not include every detail here because for fuel saving you will need to take a full tank every time and the pit stop length is pre-calculated here instead of calculated step-by-step.

----

From the first chart you can immediately see that in this way we will need 2 stints more than the current schedule. However, the last stint is very short (7 Litres). We could easily fuel-save that off and make it 24 stops if everything goes according to plan, but if we want to do 23 stops then we have to save about 2 minutes worth of fuel every stint.

Can you guys check it out to see if looks alright or if there is anything you want added?

 

[Slider]

Re: Daytona 24 B2O team?

Noel, to record locally with decent quality and low system impact, you'd need some specific settings on OBS, otherwise it'll cause big problems. I will linger in TS and when you come on, I can give you what I got (friend gave me that and it works great for both of us), and see if it helps.

 

[Daunt]

Re: Daytona 24 B2O team?

Your calcs, Noel, they're based on our stints that were with no draft? Weather shouldn't play a major role, as it's night. I have to imagine that we can save enough to go 23 stops only. We'll just have to play a bit more cautious at the start, fuel-wise and see how it sets us up at the mid way.

Either way though, shaving off 2 whole stops is a big deal and definitely worth trying to conserve fuel. Can you also lay out, assuming a ~33 lap stint and/or 34 stint, where we should be in terms of fuel left each lap? So the codriver can reference the chart and see how much fuel is left, say, 10 laps into the stint and see that he needs to have 100 liters in the tank. So if he had 98 liters in the tank, he could tell the driver to conserve more because he's off.

This chart will give us an idea that if we're pitting on lap 198 instead of 200, we need to adjust. I'll link it also on the OP. Keep that same sheet and if you can, add the above to it and get rid of the other two methods. I think it's a no brainer to go the fuel saving route. Nice work.

EDIT: I think with that, and if you can do the other thing above, I'll change my driver sheet to better reflect stints. They'll show and go by laps rather than hours (though it will still indicate it)

 

[Slider]

Re: Daytona 24 B2O team?

And slight fuel saving on each stint (earlier lift for T1, etc) with max 0.5 sacrifice in laps should help us shave off a stop too, probably.

 

[Peeble]

Re: Daytona 24 B2O team?

No iSpeed for this unfortunately. I was running it but it doesn't save the laps during a test session.

I think it does, but I got it from your replay anyway

Can't attach it through the forum because .irlap files aren't allowed (ken pls fix) so here it is if anyone wants it: https://mega.nz/#!TEg3RSAZ!yQtayV14X4SBAqFvBi7wekm3HeoJIORzCidzCNhZwN4

 

[Noodleguitar]

Re: Daytona 24 B2O team?

Thanks guys, Dino helped me in TeamSpeak with OBS. Changing from Window Capture to Game Capture made it work completely fine.

Your calcs, Noel, they're based on our stints that were with no draft? Weather shouldn't play a major role, as it's night. I have to imagine that we can save enough to go 23 stops only. We'll just have to play a bit more cautious at the start, fuel-wise and see how it sets us up at the mid way.

Yes, they're based on your fuel usage per minute, so ideally we want to use a number from a stint with partial draft.

Either way though, shaving off 2 whole stops is a big deal and definitely worth trying to conserve fuel. Can you also lay out, assuming a ~33 lap stint and/or 34 stint, where we should be in terms of fuel left each lap? So the codriver can reference the chart and see how much fuel is left, say, 10 laps into the stint and see that he needs to have 100 liters in the tank. So if he had 98 liters in the tank, he could tell the driver to conserve more because he's off.

Yep, I'll add the lap-by-lap fuel values later. They'll only be offsets from a previous pit stop, because listing the fuel value of lap 486 will never be accurate. This is what Davey and I were doing in the BES races and it worked pretty well.

This chart will give us an idea that if we're pitting on lap 198 instead of 200, we need to adjust. I'll link it also on the OP. Keep that same sheet and if you can, add the above to it and get rid of the other two methods. I think it's a no brainer to go the fuel saving route. Nice work.

EDIT: I think with that, and if you can do the other thing above, I'll change my driver sheet to better reflect stints. They'll show and go by laps rather than hours (though it will still indicate it)

I'll add some more info to the fuel saving chart if we're using that one. I'll also leave the other two intact because when the lap times change then the number of stints also changes.