Gran Turismo 6 general Physics Discussion(as well as video)

Yeah I noticed that and it puzzled me - does this actually happen in a real car?

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Also re taking ABS off, I think the cars are just locking up the rears, hence why the oversteer....

Theoretically, holding the brakes on can prevent the suspension from moving in one of its degrees of freedom, even if that's just the play or flex in the linkages, bushes etc. (which PD have been able to measure on real cars). I have seen it in other sims (iRacing, LFS), and it happens all the time on my mountain bike, and on motorbikes (the fork cannot extend from under the bike if the front wheel cannot roll forwards, say, and that's very simple geometry) Most car suspension geometries move in 3 dimensions, too, so it's not entirely impossible.

Whether it happens on real cars, I don't know, it's not something you tend to see - but it's hard to know if that's because it can't happen or because replicating what you did doesn't happen in real life. The suspension can do weird things when you put the (usually cable-actuated) handbrake on, but that's probably due to reaction forces through the chassis. It may just be that the bush / linkage flex is exaggerated in this case, or the chassis doesn't flex enough, or there's not enough stiction or whatever.
 
I was a bit skeptical about the amount of body roll that 370z shows. But looking at the real thing, it looks quite right.

Start at 01:40 min:


The car is significantly undersprung in the demo.

It nearly has the front bar on the ground while in real life there is much less roll and dive.
 
Have any of the cars rolled over (did not see the whole physics abuse video Colin :lol: )

and yes would love a comparo vid to a real GTR

No, but I think the Nissan Leaf might be able to be coaxed into one if it's possible :)
Was able to do it GT5 with extreme jumps and impacts
 
I liked the new physics, it's a lot easier to use the body roll and the weight transfer to throw the cars into the corner 👍
 
One thing GT6 needs is more springiness in the suspension play. I noticed how damped the 370z in my braking bit of my GT6 abuse video around 1:00 mark

See 5:10 in this video
 
Theoretically, holding the brakes on can prevent the suspension from moving in one of its degrees of freedom, even if that's just the play or flex in the linkages, bushes etc. (which PD have been able to measure on real cars). I have seen it in other sims (iRacing, LFS), and it happens all the time on my mountain bike, and on motorbikes (the fork cannot extend from under the bike if the front wheel cannot roll forwards, say, and that's very simple geometry) Most car suspension geometries move in 3 dimensions, too, so it's not entirely impossible.

Good point. Bikes do it because of the rake on the front forks. Bikes have a lot more rake than cars have caster, but I guess the same thing would apply. Possibly it's a bit overdone, but yeah.
 
CoolColJ
One thing GT6 needs is more springiness in the suspension play. I noticed how damped the 370z in my braking bit of my GT6 abuse video around 1:00 mark

See 5:10 in this video
<a href="http://www.youtube.com/watch?v=vo7MoX_Fuds">YouTube Link</a>

I feel the same way about the leaf. Great to see the body movement, but it seems a bit too controlled still.

It'll be interesting when we get the old muscle cars on track. We all know how bouncy they can be irl. No doubt they will roll a lot and pitch a lot, but how quickly they recover to neutral again will be the test.
 
Setting the Wheel settings to simulation and increasing the ffb makes the experience better,also love how you can press pause before entering the event to alter tye wheel settings
 
Yet, I wonder if this could be replicated with GT5'S suspension settings...?

Another observation I made is that the cars in the demo have progressively harder suspension (visually, with regard to the amount of body roll) in relation to their performance, which does seem reasonable as well.
What I typically do in GT5, after buying the tunable suspension, is start with full soft on the spring and cut the dampening and roll bar values in half.

Short answer, no, you cannot currently replicate the GT6 suspension action in GT5.
 
Sure handles different to the 370z, which has more initial understeer.
GT-R is much more neutral, with grunt and grip/traction. You don't notice it's extra weight. Much more inline with the real world GT-R I guess, since I haven't driven one :)

First time a GT-R that is not understeer prone in a GT game....

I noticed something I'll call "step-off understeer"[if anyone know's the correct term, please] with the GT-R on high-speed corner entry. Body weight shifting or ? Please help define this. Thank you.
 
Sure handles different to the 370z, which has more initial understeer.
GT-R is much more neutral, with grunt and grip/traction. You don't notice it's extra weight. Much more inline with the real world GT-R I guess, since I haven't driven one :)

First time a GT-R that is not understeer prone in a GT game....

Not sure why everyone isn't shouting this from the high heavens!! I hated driving GTR's in GT5 for that reason, and here we have the demo and this one handles like a dream (for a 4wd tank). Even with full tuning they just never felt right to me, and here's one out of the box that feels like it needs little improvement. If this is what we have to look forward to in GT6, I'm all in, warts and all.
 
Not sure why everyone isn't shouting this from the high heavens!! I hated driving GTR's in GT5 for that reason, and here we have the demo and this one handles like a dream (for a 4wd tank). Even with full tuning they just never felt right to me, and here's one out of the box that feels like it needs little improvement. If this is what we have to look forward to in GT6, I'm all in, warts and all.

Hi, JP, just got into 1 minute range at 1st GTR TT with no ABS :) I'll try to get close to your time, right now I'm half a second behind.

The GTR is so life like, with power oversteer on slow corner exits and great balance, I'm loving it.
 
The car is significantly undersprung in the demo.

It nearly has the front bar on the ground while in real life there is much less roll and dive.

(Loosing count of the number of times I have said this in the last two days)

Sorry but no its not....

37455d1164165049-much-leaning-body-roll-lean.jpg



You didn't know :lol: ABS 1 is dull, I never for a second have it at 1 - except in that driving intro with Lucas :yuck: ABS still the same as in GT5 :(.
With ABS off in the demo you then have a car with incorrect brake bias, the same issue with GT5. In addition ABS 1 is categorically not the same as it was in GT at all, the stabilisation effect that GT5 ABS had is significantly reduced, to the degree that if you unsettle the car enough under braking it will loose control (which will not happen in GT5 at all).
 
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Hi, JP, just got into 1 minute range at 1st GTR TT with no ABS :) I'll try to get close to your time, right now I'm half a second behind.

The GTR is so life like, with power oversteer on slow corner exits and great balance, I'm loving it.

I guess I'll have to run a few more laps then to make some space..lol. I'll give it a go without ABS soon and see where I get. I still can't find the braking points for the sweepers consistently. I'm stoked to give GT6 a go with no ABS and tunable brake bias, although I hope they improve the brake strength scaling from GT5.

I find it funny that with all the complaints about GT-R's the past 3.5 years, almost no one is touting the dramatic improvement in the car for the demo. It's a much better drive now than it's ever been, and that's without tuning. I can't imagine how good it will be with a little tweaking. :):dopey:
 
I guess I'll have to run a few more laps then to make some space..lol. I'll give it a go without ABS soon and see where I get. I still can't find the braking points for the sweepers consistently. I'm stoked to give GT6 a go with no ABS and tunable brake bias, although I hope they improve the brake strength scaling from GT5.

I find it funny that with all the complaints about GT-R's the past 3.5 years, almost no one is touting the dramatic improvement in the car for the demo. It's a much better drive now than it's ever been, and that's without tuning. I can't imagine how good it will be with a little tweaking. :):dopey:

The 1st turn ( sweeper ) is killing me :lol: and the 2nd GTR TT - I am now at 1:11.470, might get into 1:10s soon. I like the 2nd layout, lots of high speed section and deep braking - last chicane is fun with no ABS trail braking :P

I find the physics - suspension makes the majority of the difference for the GTR. The tires while they give more information now, still feels a bit sterile.
 
With ABS off in the demo you then have a car with incorrect brake bias, the same issue with GT5. In addition ABS 1 is categorically not the same as it was in GT at all, the stabilisation effect that GT5 ABS had is significantly reduced, to the degree that if you unsettle the car enough under braking it will loose control (which will not happen in GT5 at all).
In GT5 there's quite a number of cars that are very unstable under heavy breaking with ABS set to 1. Well, there was quite a lot (most MR cars basically) with the "1.0 physics", and there are still a few of them exhibiting such behavior with the newest physics (Dome Zero Concept I drove a few days ago).

Otherwise I agree with most of your comments. I feel I still need to drive a bit more in order to have a more fleshed out opinion, but I think the new physics engine is indeed a huge step in the right direction : better suspension behavior, better grip feeling, nice body roll (if maybe a tidbit exaggerated on some of the replays I saw but that may just be me being unused of seeing a Leaf getting so much abuse :dopey:). Feels very good (except for inconsistent framerate obviously).

On a side note, the Demo seem VSync locked and I think I prefer seeing the game drop some frames than getting the awful tearing we got in GT5.
 
I don't see much point in using ABS 0 if you can't change the BB. I thought ABS1 felt fine, that initial understeer wasn't so evident in the untuned Z. Easier to point up than GT5.

I drove GT5 on Autumn Ring then GT6 with the Academy Z. What a profound difference. Makes a nice point of comparison between the 2 GT's. Definitely feels like a more realistically modeled suspension at work. Faster grip progression in GT5, almost feels like a grippier tire in GT6...easier to manage transitions. Initially the steering felt slow in GT6 but compared to GT5, it's similar. Once again probably a result of suspension refinement.
 
With ABS off in the demo you then have a car with incorrect brake bias, the same issue with GT5. In addition ABS 1 is categorically not the same as it was in GT at all, the stabilisation effect that GT5 ABS had is significantly reduced, to the degree that if you unsettle the car enough under braking it will loose control (which will not happen in GT5 at all).


You right, ABS 1 in the demo seems to be less forgiving, sorry I just gave it a go with the 370z, I didn't have any drama during the driving intro part which is why I thought it was the same earlier.

I tried to late brake with ABS 1 at Grand Valley East Reverse then abuse the brakes like mad, yeah, something is different with ABS :) But I still prefer ABS 0 even with 5/5 BB locked in.
 
Can't you just change the brake bias settings on the DFGT wheel? I don't know if you can change it on the demo but my red circle selection thing doesn't work anymore so can't change it either way.
 
Can't you just change the brake bias settings on the DFGT wheel? I don't know if you can change it on the demo but my red circle selection thing doesn't work anymore so can't change it either way.

It's locked and there's no RA menu key assignment under options either.
 
So just played GT6 for a bit and have a few opinions/observations.

Physics differences are subtle/minor and for the most part it feels very much like GT5, infact if you really weren't looking out for it you could be fooled for thinking you were playing the same game.

ABS-1 is still fairly optimal as turning it off still hilariously makes the car act as if you just ripped up the handbrake with even minimal pressure on the brake, it is drivable with practice but very unrealistic. The gearbox/clutch system is still broken and does not work like a real car, still easy to miss gears and go straight into neutral.


To top it off there is still no deadzone setting, so with a brake pedal that even with the slightest touch of pressure acts in a way that adds considerable braking power (unrealistic even by sensitive modern powered brake car standards). With my G27 pedals now having a few years use the brake pedal does have a slight rub and that can be a big issue when GT6 (like GT5 was) is so ridiculously sensitive topped off with no deadzone, makes for a frustrating experience that could be easily fixed.


Still I like it, but it's just another flavour of GT5 for me, they should have announced it for PS4 instead.
 
Anyone feel like there was a difference in the tires? I can't tell if it's the refined suspension or actual tire flex or both.
 
I like the freedom of movement under braking. IRL the car still responds to steering inputs while braking, GT5 didn't have much scope in that area.
 
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