Edit: accidentally hit “post” while I was still typing.
@craw4dm , not sure if you’ll get notified if the my quote because it was in an edit.
Forgive me guys and gals, for I'm a newb when it comes to GTS and any driving game, but why "tune" your car? Hasn't the manufacturers already tuned them for us, or are we tuning them for our own particular driving styles? If the latter is the case, then how can there be cut-and-dry guides out there for us to follow?
TYIA
Many reasons to tune:
1. First, none of the base tunes in GTS are accurate. All the cars come with a generic base tune on them when you acquire them, but that tune is not accurately modelled after any real life tune. This is why we see, for example, a BMW M4 having be exact same damper, roll bar, and toe settings, as a Subaru BRZ. These are not accurate manufacturer settings, they’re generic PD fudgery.
2. Even if the base tunes in GTS were accurate, there’s still reason to tune. When a manufacturer adjusts settings for a road car, they set the car up in a way that that Safety and Comfort are the primary objects. A car tuned to drive on a knife edge at the limit of grip is neither safe nor comfortable.
Typically, when taking a road car and setting it up for performance driving, you lower the ride height and stiffen the springs, dampers, and roll bars. This makes the car much more responsive, and less prone to being “floaty”, which can cause the balance of the car to be upset during a variety of situations.
3. To add speed. This is mostly with the transmission. Again, a road car’s transmission is set up to handle a variety of situations, from driving through a parking lot, to getting max fuel economy at 100km/h for hours on end. Typically, race cars don’t do those things, so their transmissions don’t need to be able to handle those situations. This means we can tune the transmissions to provide maximum acceleration (and sometimes enhance drive-ability) in the range of speeds we’ll see on a given circuit.
4. Personal preference. Every driver likes their car to feel a certain way when driving on the limit. Some people like a little more of a pointy front end, they’re comfortable controlling oversteer. Other people like a more dull front end and a very stable rear, which allows them to really chuck and throw the car into corners without having to be so delicate with their inputs. Some people like to roll as much apex speed as possible, while others like to diamond corners so they can square off their exits. All of these different techniques and preferences require different settings.
5. Circuit specific. Manufacturer settings are set in a way that a car can handle a huge variety of situations. Parking lot to freeway, asphalt, gravel, snow, potholes, speed bumps, you name it. Racecars only have to do deal with racetracks, no speed bumps or washboards, just flat asphalt. Well, relatively flat asphalt, and that changes from one circuit to the next. Some tracks, like for example the Nordeschief, or Bathurst, are really bumpy, so they require suspension settings which can handle the bumps. On the other hand, a circuit like Suzuka, or some of the fictional PD circuits, they’re smooth as glass, so you can really lower and stiffen the car, which allows you to be extremely precise with your placement of the car.
It gets even more complex in cars which produce downforce. For each circuit, tbere’s basically a “magic number” for how much downforce you want to run, which is the ideal compromise between grip and top speed (sometimes there’s a small range of ideal downforce, not just one ideal setting). But downforce doesn’t work all on its own - ride height, as well as rake (the difference in front/rear ride height) make a massive difference on downforce levels (generally speaking, the lower the car, the more downforce. The more forward rake, the more downforce). Furthermore, springs and rolebars can have an effect on how much downforce a car can produce (less body roll = more downforce).