Game mechanic explanation and tech (technical terms used!)

TURBO CONFIGURATION FULL STORY

the way the turbo works is like a twin turbo or a turbo + supercharger in all cars. the turbo that kicks inn first behaves differently than the second turbo.

the first turbo reacts to throttle input much like the rev-counter does, it is possible to hold it at any given amount of boost and decrease or increase it at variable rate. 

the second turbo will never kick inn before the first turbo is at max charge. The firs turbo will never decharge before the second one is out of charge. the second turbo can gives variable amount of boost, but it can only have 4 states of operation: no charge, max charge, charging, de-charging. the rate of charging and de-charging is always constant. its possible to keep the second turbo at half chargeby rapidly going off and on the throttle. The second turbo appears to be more powerful than the first turbo, but that might be because the first turbo is not very easy to detect/measure.  

WHY THIS IS IMPORTANT AND WHY HALF THROTTLE IS IMPORTANT 

half throttle is a technique that a lot of the best guys use (if not all). this is why its faster! the max rate of charging in both turbos is severely limited, but when half throttle is used successfully through a corner the first turbo will never decharge because half throttle is enough to max out the first turbo in most cars, this means you can manipulate how soon after a corner the second turbo is activated, thus giving more power more quickly. this can also be described as turbo lag and might explain why flow is so damn important to get quick lap times. this information is probably more useful in battles as it can give you a better exit even if you are taking a slower line through a corner.  
 


CARS THAT DONT FIT THE EXPLENATION

The coquette (sports) gets full boost almost instantly (before hitting 5000 rpm 1st gear while spinning) and it takes forever to decharge (Wont decharge unless fully stopped for 15 seconds. It Decharge like supercharger when holding handbrake and tapping the throttle if already decharged)
Took me a good amount of time to convince myself this wasn't a flat boost because its so instant. This is also the only car i have tested where the boost indicator is active even if turbo isn't installed. this also make me doubt my findings for this car. as stated i might have been fooled by gearchanges doing this test. IN SHORT: more testing needed

Z-type turbo works properly, its just not very strong.

Well, considering that the most common model flag setup is "440010" it's safe to assume that "ABS_STD" refers to braking, using the "standard" method whatever that means. "440010" translates to McPherson, McPherson, null, null, ABS_STD, null. And it holds true for a lot of cars, the way their camber changes looks a lot like how McPherson geometry would behave.

Seeing as even GTA SA had two ABS options for cars (one for the player, one for AI if I recall correctly) I see no reason why their successors wouldnt. Although it was very basic, limiting the braking force to be near the traction limit, it was still a very real thing. Some cars stayed nicely controlled during braking like the Banshee, while others required a bit finesse to stay in control like the Infernus that locked up all 4 if you werent careful.

Also I already mentioned this in the first post of the handling spreadsheet thread aswell, which is where that screenshot comes from.

Well, I remember Nismo. recommending the large one that extends to the rear because it makes your small Panto longer (rather than higher).

" Every physical body has something known as the Centre of Mass or Gravity. This is a point usually inside of the volume that makes up the hitbox of the vehicles aswell as the destructible props. From here the pull of gravity is applied, hence why it's referred to as CoG. The way this point is traditionally decided is by looking at the bounding size of each hitbox that makes up the body and then taking the average position vs size of it all. Keep in mind that the CoG is only based on what's permanently attached, so things like the doors or hood wont change the main car's CoG as those parts are seperate physical bodies. So say you lose a door that wont make the car lighter on that side nor heavier on the opposite.
"
Im not sure if it is a placebo efect ( I havent made any tests, or know how to test it) but it feels like when on my carbonizare I put the roof down , the cog gets lower and the rear feels a bit lighter.

It's not a placebo, it's very plausible that it's a real thing. Because if you stand on top of a car that's putting its roof down the colliders wont update until it has reached the end of the animation, causing you to stand in the air until it's finished. A second reason it's plausible is because I recall seeing the roof of the 9F Cabrio being made out of 3-4 collider parts. Each one if pretty small, but if you count them as a whole it should be enough to cause a noticable difference.

*Double checks some game files*
Hm... Ok so the roof is just one complete piece being turned on and off. So it's certainly plausible that it has the same kind of effect as baggage on the roof. If this is the case it would mean that putting the roof down, disabling the roof part, is how the car would've originally handled.

EDIT: And I should mention that a small number of people have told me that putting the roof down on the 9F changes its handling. I briefly tested it, but it was on a new track so I was more busy learning the track than getting a feel for the car.

EDIT2: fuksias I was just pointing out a general case. The point I was making is that most cars use some form of ABS, the type of ABS is beside the point. But either way, it's an important observation when inspecting the Injection's handling.

This roof thing.. Why wouldn´t this apply to doors and a hood? Is it because those items do not add anything to the shape of the original bounding box?
Does this mean that losing a bumper should have impact on the handling? Because the shape of the vehicle will be altered, like when you lose your trunk+spoiler.

I R VRY CNFUSD