Gran Turismo 7 Physics

Do you want more detailed and realistic physics on the next GT

  • Total voters
    203
  • Poll closed .
Bullwinkle
Did I say rear? I meant front. The Audi is an MR, which accounts for the different weight balance. I’m curious what spring settings look like for a heavy front end so I can fiddle with things.

This could potentially be a really big deal for tuning…
Click to expand...
Ah okay... well my personal favourite Gr3 the Jaguar has a 52-48 weight distribution which means it has inherent understeer that I've been trying to solve since the early days of Sport!!! Like I said in another post I haven't found the sweet spot for this car yet not having any real world comparison for the suspension, but as an example of what the figures might look like...

Jaguar
Total weight - 1250kg

Weight over axles (per wheel) -

Front - 325kg

Rear - 300kg

Let's use these spring rate figures I took from a setup for the Nissan GTR GT3, another front-engined car that has a tendency for understeer...

Front - 176000nm

Rear - 134000nm

As we can see, the front springs are stiffer than the rear as is typical for cars like this. How does that translate into hz though if we wanted to apply them to the Jaguar...

Front - 3.704

Rear - 3.364

So whilst the two figures are closer than on the Audi, the front Natural Frequency is still higher than the rear.

If we evened out the spring rates so they were the same at each end of the car...

Front - 176000nm

Rear - 176000nm

We then get...

Front - 3.704

Rear - 3.855

I reckon that even NF figures front to rear could actually be a reasonable place to find a balance on a car like this. It's probably why the Jag is one of those cars that feels pretty decent to drive on it's BOP setup.
 
Last edited:
danardif1
I reckon that even NF figures front to rear could actually be a reasonable place to find a balance on a car like this. It's probably why the Jag is one of those cars that feels pretty decent to drive on it's BOP setup.
Click to expand...
What are NF figures?
 
danardif1`s calculation example:

"Jaguar
Total weight - 1250kg

Weight over axles -

Front - 325kg

Rear - 300kg "
------------------

= total weight 625kg. Try again ;)
 
Who wants to compare physics of GT7 with ACC: Asetto Corsa Competizione for PS4 is still on sale for a few days in the Playstation store for the give away prize of 13,99 EUR!

I tried it yesterday and found wheelspin under full power on the GT3 Lambo when I switched off TC. Guess that's more realistic then the built-in TC (even with TCS=0) on race cars in GT7.
 
F30clubman
Who wants to compare physics of GT7 with ACC: Asetto Corsa Competizione for PS4 is still on sale for a few days in the Playstation store for the give away prize of 13,99 EUR!

I tried it yesterday and found wheelspin under full power on the GT3 Lambo when I switched off TC. Guess that's more realistic then the built-in TC (even with TCS=0) on race cars in GT7.
Click to expand...
This was caused by people who jelled long enough that the release physiks wasnt right. So they lift the overall grip.

Instead of changing the physiks the should finetune the cars a bit better for bop and untouched settingsheet. But that was the lazy PD way to do so.

Grip in general is a bit to high right now.


Ps: The problem is.

How can it be that 90% of all gr.3 cars, no metter Mr or Fr have te same values in the setupsheet. That cant work.
The mr cars was an easy fix for snap oversteer. Lift the car and lift the rearwing or lower te frontwing to balance the car out. The only cars i couldnt propper fix was the redbull 2019 and 2014, because youre not allowed to change the rigthigt.
 
Last edited:
RacingFan1
I like current physics in general, except for many FF cars that have ridiculous oversteer on braking, makes no sense to me. The Honda Civic (Sport mode time trial) is one of them. God I hate how it handles.
Click to expand...
Thats natural behave when u brake hard and steer in the same moment and shift to fast down in a to low gear. Try to brake and in that moment u start to steer go slow of the brakes and stay one gear higer than u did right now. Helps me a lot.
But i have in general problems to go from sf19 slick tires to closed cars on sport tires.
Took always a wile to wrap my head arround it ;)
 
Last edited:
RacinLei
Thats natural behave when u brake hard and steer in the same moment and shift to fast down in a to low gear. Try to brake and in that moment u start to steer go slow of the brakes and stay one geer higer than u did right now. Helps me a lot.
But i have in general problems to go from sf19 slick tires to closed cars on sport tires.
Took always a wile to wrap my head arround it ;)
Click to expand...
Some maybe, but that much? I've never seen such a thing in real life :boggled:
 
RacingFan1
Some maybe, but that much? I've never seen such a thing in real life :boggled:
Click to expand...
Seen or felt it by urself in real live? Dont try it but in real the same will happen.
Watch the replay from the number 1.
Hes always low rpm in higher gears trough corners.
 
RacinLei
Seen or felt it by urself in real live? Dont try it but in real the same will happen.
Watch the replay from the number 1.
Hes always low rpm in higher gears trough corners.
Click to expand...
The few times I pushed and braked hard with my car IRL (FF too) it went straight on understeering, no oversteer at all
How can I watch the replay? I only saw the option of loading the ghost...
 
Last edited:
RacingFan1
The few times I pushed and braked hard with my car IRL (FF too) it went straight on understeering, no oversteer at all
How can I watch the replay? I only saw the option of loading the ghost...
Click to expand...
Go to the event. Dont join. Open rankingboard and then you have the option to watch replay. One thing they should add btw. When you are in the event in the menu, the option to watch replays and load ghost.
 
Last edited:
I've felt a good difference on the controller. The steering angle has increased and the car is much more free now. I guess for steering wheel nothing has changed as they don't have built in countersteer... It's a great change
 
The introduction of the telemetry UDP data has revealed something interesting about the tyres in GT...

The way they seem to wear out is by gradually getting hotter, and base temperatures relative to each end of the car seem baked in rather than setup or physics-driven. I was running my Gr3 Jag with the Sim dashboard app hooked up on my phone, and the starting tyre temps were 64 at the front, but 67 at the rear. The temperatures will rise sharply when you brake, but not really when you put load on them in a corner, and they progressively rise as you go through a run, so after a decently long run (can't remember what tyre wear multiplier I was on) the temps had risen into the high 70s at the front and 82/83 at the rear, with maybe about 70% left on the tyre graphic.

This seems to me to be the crux of all the quirks and flaws in GT7's physics system. This tyre model is just plain weird and doesn't seem to be based on how a tyre actually works.
 
danardif1
The introduction of the telemetry UDP data has revealed something interesting about the tyres in GT...

The way they seem to wear out is by gradually getting hotter, and base temperatures relative to each end of the car seem baked in rather than setup or physics-driven. I was running my Gr3 Jag with the Sim dashboard app hooked up on my phone, and the starting tyre temps were 64 at the front, but 67 at the rear. The temperatures will rise sharply when you brake, but not really when you put load on them in a corner, and they progressively rise as you go through a run, so after a decently long run (can't remember what tyre wear multiplier I was on) the temps had risen into the high 70s at the front and 82/83 at the rear, with maybe about 70% left on the tyre graphic.

This seems to me to be the crux of all the quirks and flaws in GT7's physics system. This tyre model is just plain weird and doesn't seem to be based on how a tyre actually works.
Click to expand...
That's how F1 teams measure tire life, the closer the inside temperature gets to the outside of the tire, the less tire you have. It is weird that the temp doesn't rise up when you put load on them though(at least during cornering).
 
venancio
That's how F1 teams measure tire life, the closer the inside temperature gets to the outside of the tire, the less tire you have. It is weird that the temp doesn't rise up when you put load on them though(at least during cornering).
Click to expand...
But it's not how tyre wear works properly. A tyre doesn't just get hotter as you complete laps, it may do as things go because you're wearing the tread down or as the compound degrades, but it's not the core component of what makes the tyre lose it's grip.

An hour of racing on ACC for example with stable ambient temperatures may see the hot temps of the tyres go up a degree or so from when they were fresh on, but they're still fundamentally in the same window.

I do think if PD were able to put some more work into this or even (practically impossible with the Japanese work ethic I know) sought input from a 3rd party, they could go a long way to achieving a very high level of simulation within GT7...
 
danardif1
The introduction of the telemetry UDP data has revealed something interesting about the tyres in GT...

The way they seem to wear out is by gradually getting hotter, and base temperatures relative to each end of the car seem baked in rather than setup or physics-driven. I was running my Gr3 Jag with the Sim dashboard app hooked up on my phone, and the starting tyre temps were 64 at the front, but 67 at the rear. The temperatures will rise sharply when you brake, but not really when you put load on them in a corner, and they progressively rise as you go through a run, so after a decently long run (can't remember what tyre wear multiplier I was on) the temps had risen into the high 70s at the front and 82/83 at the rear, with maybe about 70% left on the tyre graphic.

This seems to me to be the crux of all the quirks and flaws in GT7's physics system. This tyre model is just plain weird and doesn't seem to be based on how a tyre actually works.
Click to expand...
I tried that sim app other day and the tyre temps were strange. It was like watching a brake temps go up and down. Ive been told the app doesn’t read the tyre core temp and it only reads the surface temp of the rubber.
 
Has anyone noticed any differences with midships, specifically Ferraris?

I was running S-4 (F50 at Monza) which I recall being notorious for spinning up at the first chicane and likewise the second further down. Tonight the car just seemed incredibly planted.

It was enough for me to consider checking the F40 out again in stock guise. I have a lot of miles logged with the F40 and remember it being quite lively which prompted me to work on a tune for it (testing encompassed 1,000 miles!).

Just tried it again, stock, after my S-4 experience with the F50 and found it far more enjoyable to use and easier to handle. The F50 handles better than the F40 as regards stability but the F40 feels better than it did not too long back.

Anyone able to confirm I'm not going mad ha! Love it though as I had to use a heavy ballast to balance out my F40 which detracted from its reputation and characteristics for being a bit of a raw barebones lightweight kit car of a ride. I'd take this handling, I believe I'm now experiencing, all day long.
 
Last edited:
Sunzi
Has anyone noticed any differences with midships, specifically Ferraris?

I was running S-4 (F50 at Monza) which I recall being notorious for spinning up at the first chicane and likewise the second further down. Tonight the car just seemed incredibly planted.

It was enough for me to consider checking the F40 out again in stock guise. I have a lot of miles logged with the F40 and remember it being quite lively which prompted me to work on a tune for it (testing encompassed 1,000 miles!).

Just tried it again, stock, after my S-4 experience with the F50 and found it far more enjoyable to use and easier to handle. The F50 handles better than the F40 as regards stability but the F40 feels better than it did not too long back.

Anyone able to confirm I'm not going mad ha! Love it though as I had to use a heavy ballast to balance out my F40 which detracted from its reputation and characteristics for being a bit of a raw barebones lightweight kit car of a ride. I'd take this handling, I believe I'm now experiencing, all day long.
Click to expand...
Do you mean differences since 1.19? Or 1.13? And do you play with a wheel?
 
sejtur
Do you mean differences since 1.19? Or 1.13? And do you play with a wheel?
Click to expand...

1.19.

I play with a DualSense.

Edit: been using it again this morning, stock. So much more well-mannered now IMO. Back doesn't step out as much at corners like it used to - unless you are really over-cooking it.

The F50 feels so much safer out of the first 2 slow chicanes at Monza (S-License). I remember thinking they were TC1 corners because of the cars propensity to spin up. Very much manageable now... either that or I became better between patches. I do have a lot of miles logged with the F40 - there's a difference to me and I alluded to a physics change straight after the patch when using the Kokusai Kaihatsu to enter the neo-classical event for the first time.
 
Last edited:
Roggers
I tried that sim app other day and the tyre temps were strange. It was like watching a brake temps go up and down. Ive been told the app doesn’t read the tyre core temp and it only reads the surface temp of the rubber.
Click to expand...
That would make more sense seeing how the temps spike under braking, but it doesn't really explain sufficiently why there's an inbuilt disparity and why they increase as the tyre wears...
 
danardif1
That would make more sense seeing how the temps spike under braking, but it doesn't really explain sufficiently why there's an inbuilt disparity and why they increase as the tyre wears...
Click to expand...
Don't forget, this is raw numbers. We don't know if it's temp, or something else, nor how the game handle these numbers...
 
eykxas
Don't forget, this is raw numbers. We don't know if it's temp, or something else, nor how the game handle these numbers...
Click to expand...
The numbers could as well be the result of some sort of equotation that is using temperature and by that disguises itself as a likely indicator of temperatur.
Has anyone tried what happens to the numbers when driving through or standing in a pool of water?
 
To every one of you struggling with oversteer, snap oversteer, corner exit/entry oversteer, understeer while braking and many other suspension related issues, I have quick fix for you:

Ramp up ride height to the maximum!

Apparently GT7 physics engine is bugged so Ride Height and weight transfer don't work correctly. No matter how good setup you have, it will be much better when you rise Ride Height. Tried it with few road cars already and it is confirmed that high ride height fixes many instability issues.



Here's the video, I did two short runs trough section of the track, first one with high RH, second one with low RH. Tested with T300.
 

Similar threads

Famine
Gran Turismo 7’s New Physics Are Not Entirely Going Well
13 14 15
Replies
441
Views
59K
Voodoovaj
Voodoovaj
Famine
Gran Turismo 7 PS5 Pro Update: 8K Graphics, Real-Time Ray-Tracing On Track
26 27 28
Replies
839
Views
117K
Ande3200
Ande3200
Famine
Skoda is Coming to Gran Turismo 7, Vision GT Car to be Revealed Next Week
10 11 12
Replies
337
Views
44K
karelpipa
karelpipa
Famine
Gran Turismo 7 Update 1.49: Eiger Nordwand, Six New Cars, Physics Changes, & More
53 54 55
Replies
2K
Views
244K
derekh
D
Famine
Hyundai Ioniq 5N is Coming to Gran Turismo 7’s Next Update
7 8 9
Replies
252
Views
25K
Dbwasson
Dbwasson

Latest Posts

Back