Post: GT6 Game Physics Testing
04-30-2014, 09:03 PM #1
SiNiST3R
Samurai Poster
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GT6 Physics Testing & Analysis

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Lap Battles
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Here are some videos (I can only add 2 so Ill link post where videos are posted when I can)



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The following 9 users say thank you to SiNiST3R for this useful post:

Jounijkk, kazzbakkisback, nextgole, OdeFinn, P$ycho, policedu, q-k, turbo_nova2l, tyronekfc
07-15-2015, 07:15 PM #929
SiNiST3R
Samurai Poster
When the race cars have front aero the front and the rear work together to create a pressure point or pivot point. The car has this already with zero aero but downforce adds to it and can be used to manipulate the pivot point.

The body kit I find does absolutely nothing at all its all for looks and has no impact on performance. On or off doesn't matter.

Rake has an impact on drag. Increasing rake increases downforce and drag. The "Reversed Rake Trick" uses reversed rake to reduce drag, cars will hit higher top speed and accelerate faster. Many think reversed rake nets fast laps by increasing cornering ability but that's a load of Bullshit. Looking in the data analyzer and MoTeC shows clearly all time gained is on the straights not in the corners. Even worse to abuse this many use reversed rake and have to then use ass backward settings on the car then Bitch about Physics this n Physics that lol...

What happened is the wheelie cars of GT4 doing over 390mph were taking advantage of both the reduced drag and a loop hole in the Physics engine. It's connected to cars not rolling over in GT4. The set up should of been flipping like the Merc at LeMans but the no flip in the Physics engine allowed the wheelie cars to exploit the drag Reduction AND I also believe that while IRL most resistance is wind resistance very little rolling resistance, in GT the bulk of the resistance is tied to wheel on ground contact. When the front wheels lift there is a dramatic Reduction in drag, this is creating an extream condition to exploit the fact it's a program running on hardware. The 2 front wheels lifting appears to cut drag in half. ..

I think PoDi is concentrating on online game play, and to somewhat kill abuse of wheelie cars and to also allow cars to flip over the lift from air getting under the car is simply not simulated anymore. Honestly in GT4 for a while I was over 50mph faster than the next fastest on GTP and if this got online I could honestly beat anybody on any track badly by abusing wheelie tunes. GT6 is running the same core Physics engine from GT4 albeit very much improved, GT on PS3 has been the evolution of this engine limited to the abilities of the PS3.

It's my suspicion and hopes this engine is still used for GT7 on PS4 however with less compromise due to system hardware abilities. I feel the game already running at the systems limits is compromised from grafixs to Physics. The shadows in GT a great example I believe they were more detailed in GT5 but toned down in GT6 to divert resources elsewhere I believe to improve upon something more important than shadows.. The PS4 I believe will allow them to not be forced to choose between 2 improvements or compromise visuals for Physics / Physics for visuals. Furthermore allowing them to increase the complexity of the Simulation without taxing all the systems resources.


I know in GT6 using reversed rake will have the car getting down the straights quicker. I don't use it because it forces the tuner to use abnormal settings to accommodate the rake, it makes the car not respond to tuning as it should confusing and upsetting tuners (their own fault) Tuning from a place where the suspension has room to move and the car is balanced properly is Much better then tuning sitting on the bump stops with no room to comp just room for extension while the front has loads of room for comp but nothing for extension. The suspension is all fucked up, no shit using proper tuning techniques on a fucked up car like that will yield ass backwards results.

Also important I find it cheesy to use something like reversed rake knowing it's purposely abusing an exploit. I also feel like I simply don't need it. My cars respond to my tuning as I feel they should much because I use real world techniques front to back. I don't gamer exploit ride height or any setting so I feel this helps everything work together. If any tuning tool (setting) is improperly used it compromises all the other settings, as we tune the car each setting is playing an intricate role combined with every other setting, using a gaming exploit tuning trick on one setting will inevitable fubar the way the other settings are working together and respond to adjustment. Ride height a critical setting as it pretty much dictates how much room the suspension has to move in either direction, we are tuning a suspension that is supposed to be in motion not sitting on the bump stops. With no motion obviously tuning as if there is will yield confusing results....
07-15-2015, 09:18 PM #930
Jounijkk
Do a barrel roll!
The amount of rake is interesting. How You can decide what amount is good? Is there any tools for this or is it just lap time and handling?
I have tried different amount of rake with this 86. If the amount of rake is higher than 3 mm I'm in trouble - the rear end is escaping and I can't get it good with change of setup ( I'm amateur).

I was looking the ride high from data logger and it seems to be ok ( rake 2 mm ). The right front and rear are almost identical, so are the left front and rear. Questions: what information You are looking from data logger and how to use it when you are adding for ex more downforce by using wing? How to decide the amount of downforce ( just feeling and lap time or is there something else ) and are You using corrections to suspension when adding downforce?

It looks like 86 is faster ( big Willow) without rear wing, but it's much more difficult to drive. With wing and downforce 86 goes very nice and smooth.

This Big Willow was good choice. It looks easy but it's extremely difficult. A driving school video would be nice.
Jouni
07-15-2015, 10:17 PM #931
SiNiST3R
Samurai Poster
Wow just lost huge reply posting off my phone with the stupid ass "your not logged in" error when clearly I am.

I'll try to repost, busy night with Frank Mir action tonight. One of my fav fighters going against a young monster.
07-16-2015, 06:01 PM #932
OdeFinn
Bounty hunter
@Jouni

The following user thanked OdeFinn for this useful post:

Jounijkk
07-16-2015, 09:41 PM #933
Jounijkk
Do a barrel roll!
@Ode
Exellent video, good found.
By the way, have You noticed something very strange on the track in turn 3? The car swings really strange when You turn late in, some kind error on the track.
Jouni
07-17-2015, 02:36 PM #934
OdeFinn
Bounty hunter
Jouni, don't know what you mean?
Kink after apex on center of track? Can you explain what you mean with this error.
07-17-2015, 04:16 PM #935
Jounijkk
Do a barrel roll!
Originally posted by OdeFinn View Post
Jouni, don't know what you mean?
Kink after apex on center of track? Can you explain what you mean with this error.

It's a very strange movement of the car, like It hits something. I think there is an error in my track file. It has happen 4-5times, always in the same line of the corner. It happens when You turn late in, before apex, middle of the track, car is stable and no sliding. If You have faced this problem, You woul know it, movement is so unnormal.

There is same kind of error on Nordscleife after one turn, middle of the track when You are driving straight. Absolutely not normal.

I was curious if You have met same thing.

Jouni
07-17-2015, 06:44 PM #936
OdeFinn
Bounty hunter
And you're sure at your car ride height(or soft front suspension) is not the reason for this? One of my test tunes (long time ago) had similar problem when front touches on tarmac and there was some minor elevation on tarmac.

The following user thanked OdeFinn for this useful post:

Jounijkk
07-17-2015, 08:15 PM #937
Jounijkk
Do a barrel roll!
Good thinking, suspension and ride high are possibilities. Thank You for Your brain work.
I have checked from data logger that suspension and ride high are ok, but only the fast laps ( little bit different driving line ). Those laps where this happened were not fast laps, so I didn't check those. The movement of the car is so weird that I thought it must be an error in data file. If I met this funny movement again, I'll save the lap and check it from data logger.
Jouni

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OdeFinn

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