The 4-Hour No-Pit Miata (Gran Turismo 4)
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- Опубликовано: 10 сен 2024
- After my previous video where I built the least tyre-efficient car possible using hybriding, I decided to figure out how to build an optimal car for timed endurances. Turns out it's possible to make a hybrid that can comfortably no-pit the Roadster 4hr Endurance while also crushing the AI in the process.
When B-spec is kept on pace 2 and overtake (ideally with 6000+ overall skill), it'll have just enough fuel to finish the entire endurance without pitting. The number of laps completed will depend on how often it gets stuck in traffic, but it's usually around 223 - 226.
In the player's hands, the car can do consistent 53's around Tsukuba, though pushing it like this this will obviously drive up fuel and tyre consumption. The car is extremely fun to hotlap with though, so it's worth it. I highlighted some of my best laps in the final segment, as I kept going until I got a 52.
The key element of this hybrid build is the Caterham Seven Fireblade chassis. Not only is it extremely light, it also has insane grip modifiers, giving the car fantastic cornering ability despite a front-heavy 58 : 42 distribution. When combined with the Volvo 240 GLT Estate's weight reductions, the build only weighs 306kg. We need the car to be as light as possible to minimise tyre wear and fuel consumption, and the grip modifiers work greatly in our favour as well.
The tyre choices are the Nissan GT-R Concept LM Race Car on front (sports mediums) and Chaparral 2J on rear (sports softs). These are among the widest tyres in the game, which greatly reduce wear and improve overall grip and braking distances (I tested the Tank Car's tyres, but they broke the game's physics, so those weren't an option). The car's braking distances are so short that you'll usually end up braking way too early into corners by accident. The GT-R's 7-speed automatic transmission is also used, alongside the gear trick for very close gears.
The Toyota GT-One's racing modify data is used to increase the car's max downforce to 93 / 118 with a rear wing. The GT-One has one of the lowest wind drag stats in the game, so top speed isn't hindered too much despite the massively high downforce. Downforce also seems to decrease tyre wear in this game as the tyres have more grip at their disposal. Running less downforce is an option for a bit more speed in the final sector, but I didn't feel it was necessary here.
I used the Prius engine as it's one of the lowest-revving engines in the game, which seems to have a tiny effect on fuel consumption from my testing. The torque curve is decently flat as long as you stick to NA tuning. I had to be quite clinical when adding power, as too much power increases fuel consumption. With 110hp, B-spec on pace 2 and overtake finished the endurance with 0 bars left.
I chose the Mazda 787B drivetrain, even though the Pescarolo drivetrain offers better tyre economy. The car was consuming fuel faster than it was wearing its tyres, so I felt I could afford to reduce drivetrain inertia for better overall acceleration. The Formula Gran Turismo drivetrain has even lower inertia, but its rear driveshaft inertia is much higher than the 787B's, leading to extremely imbalanced wear. To reduce consumption in A-spec, you can opt for the Pescarolo drivetrain and unequip the clutch, flywheel and driveshaft upgrades.
Any NA Miata will work for this build, I just went for the J-Limited II because it's yellow. The NB's have slightly different dimensions and will look a bit weird with the Caterham chassis wheelbase, but they'll still work. I enabled "everlasting" in GT4SaveEditor which prevents the car from experiencing oil degradation and engine/rigidity wear. It's basically what the Formula Gran Turismo has in vanilla GT4, as it's unable to be brought to GT Auto or a tuning shop.
GT4SaveEditor link: github.com/Nen...
To make this hybrid for yourself using PCSX2 (ideally the 1.7 nightly build), follow these steps:
1: using the NTSC-U version of GT4 in PCSX2 (PAL has different part ID's and won't work), buy any NA Miata, buy and equip the upgrades shown in the video, then save the game
2: if you haven't already, convert your memory card containing your Gran Turismo 4 save to a folder, by going to Settings - Memory Cards - right click your memory card - Convert - OK, then right-click the folder - Use for Port 1
3: in GT4SaveEditor, open the BASCUS-97328GAMEDATA folder in the directory of your memory card folder, click the Garage tab and edit the current car
4: swap the part ID's with the ones shown in the GT4SaveEditor screenshot in the video (setting Everlasting to 1 is recommended to prevent engine/rigidity wear in endurances)
5: close the Car Editor window, File - Save - Select Folder
6: re-open GT4 in PCSX2 and ensure the car has all hybrid parts applied properly without any issues