I started testing for the next round at Road Atlanta on the weekend already. I tested the Ford GT Race Car '18 and Subaru BRZ GT300 '21, since those are what I'm driving this season. A one-stopper in both cars seems very doable, at least for the way I drive.
Fuel is not an issue at all for me. At 1x fuel multiplier, I'm surprised that some of you are talking about fuel saving. I would have figured that all the cars can easily finish the race without taking on more fuel.
For testing I did 24 laps on RMs and 13 on RSs in each car. In most cases, the front left tire tread was completely gone by the end. In fact, in many cases I had to drive the full final lap of the test with a bald tire. I was surprised at how well the cars drove with a dead tire. They weren't fast, of course, but I wasn't spinning out or driving off the track on every right-hand turn either. It just felt like I was driving on extrenely low-grip tires.
I managed to get two rounds of tests in for the Subaru, but only one in the Ford. That's why the Subaru data is a little smoother.
Anyways, here are the numbers...
| Manufacturer | Model | Tire compound | Laps | Opt time | Best time | Avg time | Total time |
|---|
| Subaru | BRZ GT300 '21 | RS | 13 | 1:19.843 | 1:20.213 | 1:21.588 | 17:40.641 |
| Subaru | BRZ GT300 '21 | RM | 24 | 1:20.300 | 1:20.394 | 1:21.802 | 32:43.238 |
| Ford | GT Race Car '18 | RS | 13 | 1:20.147 | 1:20.895 | 1:22.378 | 17:50.909 |
| Ford | GT Race Car '18 | RM | 24 | 1:20.801 | 1:20.821 | 1:22.487 | 32:59.692 |
View attachment 1491781
Tire tread levels at finish:
| Manufacturer | Model | Tire compound | Front left | Front right | Rear left | Rear right |
|---|
| Subaru | BRZ GT300 '21 | RS | 0% | 20% | 10% | 30% |
| Subaru | BRZ GT300 '21 | RM | 0% | 25% | 15% | 35% |
| Ford | GT Race Car '18 | RS | 0% | NA | NA | NA |
| Ford | GT Race Car '18 | RM | 0% | 40% | 15% | 35% |
(It seems I forgot to record the tread levels for Ford RS. I remember that the front left was 0%, anyways)
If I simulate all of the possible one-stop strategies using the lap times from my tests, these are the fastest 3 for each car:
| Manufacturer | Model | Strategy | Total time |
|---|
| Subaru | BRZ GT300 '21 | 10RS-20RM | 40:33.060 |
| Subaru | BRZ GT300 '21 | 11RS-19RM | 40:33.299 |
| Subaru | BRZ GT300 '21 | 9RS-21RM | 40:34.665 |
| Ford | GT Race Car '18 | 11RS-19RM | 40:56.638 |
| Ford | GT Race Car '18 | 10RS-20RM | 40:57.316 |
| Ford | GT Race Car '18 | 9RS-21RM | 40:58.606 |