Gran Turismo 7 Physics

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


  • Total voters
    203
  • Poll closed .
Anyone tried the S.Shigeno AE86?

Love how it really encourages you to squeeze all of it's high-revving NA power out of the engine and loves it when you slide through corners with it. Really makes you feel like Takumi!
 
There is certainly some truth to this, but the oversteer I've been referring to is off-throttle in what are relatively benign corners with similar or exactly the same cars in other titles.
I disagree, I'm a very experienced sim racer and some cars just spin out when you even ease on to the throttle. I hope they fix it.
 
I am really confused about it. Gts physics was a huge step back from gt6...
Gt7 physics is really good, except oversteer flaws. This thread is quite toxic... Physics isn't just about how react a car on oversteer (agree that sucks a Lil on gt7). There are many things that gt7 do really good, and it is really stupid keep talking only about "snap oversteer".
Well, it's a little annoying when you spend a whole week grinding credits for your favorite car, only to find out that it suffers from the snap oversteer.
 
I disagree, I'm a very experienced sim racer and some cars just spin out when you even ease on to the throttle. I hope they fix it. Well, it's a little annoying when you spend a whole week grinding credits for your favorite car, only to find out that it suffers from the snap oversteer.
I don't think I've come across a car that "just spins out" when throttle is applied, but there are many cars that are super sensitive to throttle inputs and chassis position. Which car was giving you the most trouble?

Any car specifically? I know there are a few, and I'm like a broken record mentioning them, but two that are clearly broken are the road going Ford GT, and the Audi R8 LMS, and likely also the GR3 BMW M6 from the Nordschleife CE, although I have avoided driving it outside that challenge. But, as I said in an earlier post, the Ferrari F12 was supposed to be undrivable, but it's just very challenging. What it also is, is super fun to get good with. This has been true for me and many cars, like the F430, C63s, FD RX7, F12, C7 vette, E46 M3, MKIII Supra etc..

What specific cars have you gotten that you feel don't drive well? I'd like to try my hand at some of the problem children to see what's up with them and maybe see if some tuning calms them down.
 
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You are turning way to much.
Cant you feel that you are plowing the **** out of that poor front tires?
Nope. Regardless if the tires are loaded or unloaded, the progressive steering input with the full throttle should rotate the car. There are countless posts of examples with this with the car.
hat is that video of the FRS supposed to show other than the poor driving ability of the person making it? Why in hell would you push the car into understeer, then just keep steering into it and increasing throttle?! This goes against pretty much every bone in a drivers body
This is a demonstration of what a car shouldn’t do under these conditions. GT7 an AC are being compared and contrasted with examples of real life. Arguments are still within the scope of GT7 and there are rl videos already posted with these comparisons.
Base arguments are of what GT shouldn’t be doing. AC is an element that is brought up because many believe this is a baseline of what should be happening because a lot of the anti arguments against GT are drawn from experiences from AC. The baseline arguments need to be challenged so that outlandish claims against GT could be stopped.
Bare in mind that GT7 and AC are completely different to steering responsive approach and give drastically different results.
 
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I suggest some testing:

Those with issues, point out a certain car, a track if you wish, and something you think it can do that it "shouldn't", or something it should to that it "can't". Then some of us with "less issues" can run these scenarios and post results. This way we can streamline all this completely baseless yammering about "I have this car and it's not like this" or "cars don't do that" or "I know what I'm doing" or "this shouldn't happen" instead of continuing to talk in circles that are half full of people I don't trust know what they're doing in a car.
It's been done so many times, if you read the thread you would know that.

There are plenty of capable and qualified people on both sides of this argument, with very little in terms of people changing their mind one way or the other.

It seems pointless to waste anymore energy on this. Hopefully PD have seen enough to make some very minor tweaks.
 
It's been done so many times, if you read the thread you would know that.

There are plenty of capable and qualified people on both sides of this argument, with very little in terms of people changing their mind one way or the other.

It seems pointless to waste anymore energy on this. Hopefully PD have seen enough to make some very minor tweaks.
I changed my mind very much. The physics felt a bit weird at first but with rather good physics base. After about 100 hours I realized how great the physics is. I was the one who needed fix but currently the physics feels awesome to me and there is maybe no fix necessary. Still I have some troubles under braking but it's maybe my technique. The game is much deeper than I could ever imagine for GT. I am very surprised.
 
I’ll correct myself. I have full 900 degrees of rotation in the game. The steering animation just doesn’t show this. I used DiveHub for the G27. It just a piggyback for it. The G27 and G29 design are basically identical. Drive him just authenticates the wheel for PS4 and PS5 use.
Ah OK, did you setup the wheel correctly? used the correct FFB and turned off the aggresive understeer feedback?
I’ve seen some instances of throttle input and no rotation on power. From my testing, it seems conditional to get the car to rotate. I try to drive aggressive like the rl video of the guy I posted and the car doesn’t react the same way. There are instances where he is on a long sweeping right in 3rd on throttle and the car just wants to oversteer on him with him having to correct his steering. I tried to mimick this, but the car doesn’t react the same. In GT7 on long sweeps, you get on the throttle and the care will do something similar to the video.
I haven't seen any stock GT86 videos running circuit de Barcelon-catalunya, mind sharing them so I can study them better to see how GT86 reacts on the corners?
He started his argument for 4th gear, then moved on from there. 4th is possible, but I’m not defending the 5th gear argument. Oh m just saying I simply don’t know.
so now you changed to 4th gear and not defending 5th gear, man you change your opinion quick. also can you quote him on that? cause I remembered it was 5th gear that he posted then I started to do the test myself.
Don’t think that happens in GT7 also.
yeah but you said this
The valley goes past 4k. 4k still has usable torque to spin the car. The overall torque band is low anyways.
But that statement doesn’t prove anything. Any car can lose balance in any gear at those speeds. You tires have a lateral load limit.
how can it not prove anything? so you're saying it's possible for a RX-8 to lose it's rear traction on full throttle at 111km/h or 69 mph at 4.8K RPM? lots of people would've been dead driving IRL RX-8 then cause that's highway driving gear and speed.
 
Whatever people post is likely fixed with less steering input through the wheel and more steering through throttle/brake - turn less and use the pedals more.

But it's a good suggestion and I look forward to videos. This thread has become better.
This is exactly where the problems lie, I find. If I drive a modern car I don't have the same problems, I actually enjoyed taming the madness of the Ferrari F12 because it doesn't surprise me that a modern supercar with 700HP breaks traction easy. Most modern race cars have been okay because they're cars you don't want to have much, if any slip with. But driving RWD classic cars is where it starts to fall apart, they handle with the same philosophy as the modern cars where you have to have as little tire slip as possible. But if you for example, watch Goodwood Revival clips you'll often see the way those cars all steer there is always slip, the car isn't beyond grip but it is slipping and you just can't drive a car like that in GT7 as the sweet spot of tire slip is so narrow.

I've occasionally found the knife's edge of a sweet spot GT7 gives us in an Alpine A220 at Arnage, but it's such a fine line that it's not enjoyable. It's a problem with tires and it's a problem with FFB. GT7 doesn't have any consistency in what tires they apply to period cars as a 330 P4 is given race hard tires and the A220 is given comfort softs, despite them only being one year apart. The amount of slip a tire has is what the problem is in these physics as without an overly excessive amount of finesse you'll find the slip to be more of a cliff. This could be negated if the FFB actually warned the driver that the tire was slipping, but it doesn't. It just gives you steering weight for lateral G-forces and wobbles if you hit a kerb/grass, no sense of weight of the car in the wheel at all.
No snap because he never got back to traction. Facing the right way because he kept his foot in it and kept it there 'til the car went around. This happens, and can happen, in GT7 all the time. Nothing to see here.

This thread is intensely frustrating to read. These "but this happens at this point" and yadda yadda scenarios need to be almost exactly matched to draw actual comparison, and so they are just about useless.

Ultimately, aside from the few cars that are actually broken, the game is still fine. I drove the "undrivable" Ferrari F12 in totally stock form and was wary of it due to what everyone has said, and its simply not that bad of a car, even if it is a murderer. Totally stock on SH you can light the tires up well through third gear, but yeah, it's a 730hp 3300lbs RWD car... you better be sensitive with it. Other than being underbraked for its speed, which can be dealt with, the car was a challenging, albeit crazy, fun car to drive. No aids, no RS tires, no mods, just a fine thing to play with.

I still think, as whatever as this sounds, that most people complaining about the physics just need to put more time into slowing down and getting comfortable with the game. There are still broken cars, but they are the vast minority.
I'll bite. :) Try the classic Alpine A110 at Tsukuba, it's very unhinged for a car with 140HP, especially in the hairpins. The line between spinning out and not losing grip at all is much finer than it should be. I find it's okay at higher speeds but slow tight turns are strangely ridiculous.
 
I'll bite. :) Try the classic Alpine A110 at Tsukuba, it's very unhinged for a car with 140HP, especially in the hairpins. The line between spinning out and not losing grip at all is much finer than it should be. I find it's okay at higher speeds but slow tight turns are strangely ridiculous.
To be fair, the Alpine A110 also weighs 706kg, so it's bound to be a bit snappy. Same territory as the Stratos, requires a lot of precision to succeed.

I haven't really tried it in GT7 myself admittedly, just not surprised to hear it's snappy as that's how it was in DR2 for me.
 
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But if you for example, watch Goodwood Revival clips you'll often see the way those cars all steer there is always slip, the car isn't beyond grip but it is slipping and you just can't drive a car like that in GT7 as the sweet spot of tire slip is so narrow.
Yea, that window is narrow. Particularly for street compounds that should be able to be abused almost recklessly. And couple that with the FFB issues mentioned earlier, GT7 isn't triumphant in any way...but...there's a lot to like, especially compared to GTS...

Try the OG Mini on SH at Goodwood and tell me what you think...it's the 430pp Clubman event I think..there I believe PD got the window right. Pliable, with decent feedback so you can saw at the wheel...
 
To be fair, the Alpine A110 also weighs 706kg, so it's bound to be a bit snappy. Same territory as the Stratos, requires a lot of precision to succeed.

I haven't really tried it in GT7 myself admittedly, just not surprised to hear it's snappy as that's how it was in DR2 for me.
I love driving it in DR2, probably my favourite car to drive in that game, you can use the RR layout to your advantage by using lift off oversteer and then using the throttle to bring it back. But in GT7 the characteristics are excessively snappy, it does the lift off oversteer but in GT7 if you use the throttle to balance the car it usually just continues on its slideways trajectory into the abyss unless you really countersteer to save it in which case the grip comes back suddenly and you can easily find yourself turning right in a left hander. Don't get me wrong, I understand there are cars that should be a handful. But it should be fairly intuitive as to when a car is about to break and regain grip, I should hear, see and feel the car starting to lose grip before it fully breaks away into something I have to correct and save.

Yea, that window is narrow. Particularly for street compounds that should be able to be abused almost recklessly. And couple that with the FFB issues mentioned earlier, GT7 isn't triumphant in any way...but...there's a lot to like, especially compared to GTS...

Try the OG Mini on SH at Goodwood and tell me what you think...it's the 430pp Clubman event I think..there I believe PD got the window right. Pliable, with decent feedback so you can saw at the wheel...
Yeah, that Mini was good fun. GT7's FWD physics are pretty damn good, as when I first picked up the game and drove the first few cars (FWD) that the game gives you I was really impressed at how good the physics were. It's RWD where I find GT7's physics hit the wall, it's a lot like Enthusia Professional Racing for PS2. That game came out just before GT4 and it had some of the most fun FWD and AWD physics in any game (never had I been so excited driving a Renault Clio), but much like GT7, RWD was often impossibly sketchy (MR was okay, FR was cursed). I'm actually curious as to how AWD feels in GT7 now, as it's something I haven't really tried yet. Maybe I'll take that Celica GT-Four I just bought for a spin later.
 
I've also had good experiences with AWDs in GT7, hence my position that it's not the global physics, but rather the modeling of individual cars and/or FR chassis in general...and some MRs cars too...I admit, I don't have a comprehensive picture but there is an obvious lack of consistency based on trying roughly 80+ cars...

What would you say is the one car for you in GT7 that captures the ideal 'physics' experience Skython?
 
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Has anyone made a scientific frame time analysis of GT7 (Digital Foundry gaming website), maybe there are some microstutters, and so the wheel control is not precisely real time, so the game skips a few frames and doesnt register the wheel correction. Or its just the physics engine in this game is broken and Polyphony need to fix it. I think that is more probable. They should just revert the physics to GT Sport level, then they can tweak it from there.

I hope Polyphony didnt do this on purpose, or maybe even Kazunori sat down with a wheel on the game and told them to make the cars more snap oversteery ? That would be so wrong on many levels :)

It feels to me like Polyphony said to us players : We will make this a big harder for you than is necesarry, because we envy our gamers driving skills ? I know that is a bit far fetched theory, I hope this is not the case. I just have this slight feeling of elitism in GT7, that really shouldn't be there. It will be interesting to see if Forza 8 has any physics problems.
 
I don't think I've come across a car that "just spins out" when throttle is applied, but there are many cars that are super sensitive to throttle inputs and chassis position. Which car was giving you the most trouble?
after getting used to the GT7 physics quirks I can catch most of my power oversteer problem, but if you ask me out of all car that I've driven so far it would be the RX-8 on comfort soft. that thing snaps quite violently on throttle application.
Any car specifically? I know there are a few, and I'm like a broken record mentioning them, but two that are clearly broken are the road going Ford GT, and the Audi R8 LMS, and likely also the GR3 BMW M6 from the Nordschleife CE, although I have avoided driving it outside that challenge. But, as I said in an earlier post, the Ferrari F12 was supposed to be undrivable, but it's just very challenging. What it also is, is super fun to get good with. This has been true for me and many cars, like the F430, C63s, FD RX7, F12, C7 vette, E46 M3, MKIII Supra etc..
I liked the Catalunya CE with the Huracan Gr.3 and the Nurburgring CE with the M6 Gr.3, I even switched all assist off except for ABS and they don't have the same problem the road cars have in GT7. the lambo was oversteering on entry so I put the brake balance to 3 to the front and the car was easy to drive after that, the M6 was understeering on entry so I put the brake balance to 4 on the rear and it fixed most of the understeer. haven't tried the deep forest with Audi R8 LMS, might give them a go tonight.
I've also had good experiences with AWDs in GT7, hence my position that it's not the global physics, but rather the modeling of individual cars and/or FR chassis in general...and some MRs cars too...I admit, I don't have a comprehensive picture but there is an obvious lack of consistency based on trying roughly 80+ cars...

What would you say is the one car for you in GT7 that captures the ideal 'physics' experience Skython?
I think it's mostly RWD cars rather than FR cars, the porsche 997 GT3 snaps quite hard on throttle application.

I know the last question is directed to Skython, but I'd like to answer it too. drove the nissan sileighty on comfort soft last night and it was an excellent car to drive. I can drive the car how I want it to drive, I can power slide the car and i can grip the car on demand at corner exit quite easily. I don't think this is quite true to IRL car though, but I can't find any information on how the car is supposed to drive IRL so I can't comment further but they definitely got the basic dynamic of an FR car right on the sileighty.
 
I've also had good experiences with AWDs in GT7, hence my position that it's not the global physics, but rather the modeling of individual cars and/or FR chassis in general...and some MRs cars too...I admit, I don't have a comprehensive picture but there is an obvious lack of consistency based on trying roughly 80+ cars...

What would you say is the one car for you in GT7 that captures the ideal 'physics' experience Skython?
I'd have to get back to you on that one, but you could very well be right. I'm trying to blindly guess how their physics engine works, maybe they have a default set of characteristics for each vehicle layout and then adjust a few more car specific parameters beyond that. I posted the other day about the 330 P4 and A220 and how despite both being late 60s cars that raced at Le Mans they both default to very different tires (RH and CS respectively), and this suggests to me that those individual car parameters aren't consistent. But this is a separate point entirely, as both cars still suffer from having very little controllable slip angle. Says to me that it's in the core physics themselves, I guess (which makes what I said earlier about it being a tires problem moot).

In my mind RWD cars, especially road cars benefit from having a tiny amount of excess in rotation while turning, a slight of oversteer to keep the car rotating, but in GT7 grip is very linear, and between the point of the car being perfectly planted and spinning out is a straight dropoff rather than having a downward curve where the car can benefit from oversteer but after a certain point loses grip and then spins. It works for the game's FWD and AWD cars as they have the front wheels to pull the car straight again, but since the rolloff of rear grip is too linear you can't balance a car on power very easily as any slip is considered a significant loss of grip and you have to correct to save it rather than adapt to it.
 
I'd have to get back to you on that one, but you could very well be right.
Would be interesting to see which car you've experienced in GT7 gets closest to the ideal physics...perhaps the problem is multi-faceted...
 
Any car specifically? I know there are a few, and I'm like a broken record mentioning them, but two that are clearly broken are the road going Ford GT, and the Audi R8 LMS, and likely also the GR3 BMW M6 from the Nordschleife CE, although I have avoided driving it outside that challenge.
You're mixing things up a lot here though, the M6 doesn't suffer at all from any uncontrollable oversteer from a sudden loss of rear axle grip. If you write something like that, I unfortunately have to doubt everything. The M6 is extremely stable on the road even at the high-speed curves, airfield, Kottenborn, Schwerdenkreuz, courage curve and others, even at over 280 km/h in some cases. If the M6 had any "snap" inclination, it would never go flat at the latest at the Schwedenkreuz.

The M6 has a mighty torque even in the CE of well over 700NM and that even at almost any speed. That's why many drivers keep throwing the car off the track. Here you have to "simply" learn how much gas pedal is possible.
You can write what you want about many other cars, I won't rate it unless I know these cars as well as the M6, but THIS BMW drives fantastic and I won't give a damn. ( I would even recommend this car to Gr3 beginners as it requires some feel but is still very predictable and good natured. )
 
I think it's mostly RWD cars rather than FR cars, the porsche 997 GT3 snaps quite hard on throttle application.
drove the nissan sileighty on comfort soft last night and it was an excellent car to drive. I can drive the car how I want it to drive, I can power slide the car and i can grip the car on demand at corner exit quite easily.
Sry I missed this.

Yes agree the the 997 GT3 does not exhibit the trademark traction on throttle...will have to try the Nissan. A neutral car with good traction is always ideal.
 
You're mixing things up a lot here though, the M6 doesn't suffer at all from any uncontrollable oversteer from a sudden loss of rear axle grip. If you write something like that, I unfortunately have to doubt everything. The M6 is extremely stable on the road even at the high-speed curves, airfield, Kottenborn, Schwerdenkreuz, courage curve and others, even at over 280 km/h in some cases. If the M6 had any "snap" inclination, it would never go flat at the latest at the Schwedenkreuz.

The M6 has a mighty torque even in the CE of well over 700NM and that even at almost any speed. That's why many drivers keep throwing the car off the track. Here you have to "simply" learn how much gas pedal is possible.
You can write what you want about many other cars, I won't rate it unless I know these cars as well as the M6, but THIS BMW drives fantastic and I won't give a damn. ( I would even recommend this car to Gr3 beginners as it requires some feel but is still very predictable and good natured. )
Interesting. You have people like Super GT say this about the M6 GT3:


 
Interesting. You have people like Super GT say this about the M6 GT3:



Yep...And?

I saw/heard him. And as far as I understand him.. ( I am German and my English is not the best )..
He warns and does exactly what I say...the car has tremendous torque, so it tends to "power oversteer" if the accelerator is too hard, but the car doesn't have what is called a "snap" defect, this shows up on faster corners or when the car becomes light in a curve, as is often the case on the Nordschleife. I've driven the M6 including the CE test on the Ring and the manufacturer series for 10,000km or even more and I like it very much.
 


Here is a YouTube video I found of that very stable Mazda rx8 losing traction as there seems to be some debate about that car. Having owned one it may be stable but you can have it step out on you without much effort if you don't drive properly.


It looks like the slide starts because of shift lock, something that I don't think happens in GT7 considering you can downshift from 6th to 1st almost instantly, drivetrain simulation in GT7 is quite poor.

I’ve seen some instances of throttle input and no rotation on power. From my testing, it seems conditional to get the car to rotate. I try to drive aggressive like the rl video of the guy I posted and the car doesn’t react the same way. There are instances where he is on a long sweeping right in 3rd on throttle and the car just wants to oversteer on him with him having to correct his steering. I tried to mimick this, but the car doesn’t react the same. In GT7 on long sweeps, you get on the throttle and the care will do something similar to the video.

Your video of you trying to mimic it is awful, either you are intentionally driving bad to induce understeer or you just don't know how to drive, do I need to make yet another video proving you wrong? That video is him on old tyres and judging by how he drives I'm going to say the rear tyres have taken most of the abuse, also consider the wheel alignment, I doubt it's the same as factory.

Nope. Regardless if the tires are loaded or unloaded, the progressive steering input with the full throttle should rotate the car. There are countless posts of examples with this with the car.

Already posted videos showing you can do this in AC, of course it's not going to rotate if you make it understeer then steer into it even more.
 
How the hell do people know what grip levels period-correct tires had. That's all just made-up bul**** . I can't get decent tires on my Rx3 on the stock rims because they stopped making anything decent for them about 10 years ago. Unless someone painstakingly recorded grip levels back in the 80 this whole "period correct" argument is ********, we can make educated guesses but that's not reality, it's pure estimations.
 
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Would be interesting to see which car you've experienced in GT7 gets closest to the ideal physics...perhaps the problem is multi-faceted...
Multi-faceted in which way? Are you insulting me? :lol: I drove a bunch of cars at Deep Forest so I can at least give you some sort of answer, my two favourites were the Renault 8 Gordini and Alpine A110 '17 (I like French cars). The Gordini was really fun, even if it did feel a bit more slidey than it would realistically be, it was catchable and adjustable beyond grip which is what I expect. The new A110 was also catchable.
How the hell do people know what grip levels period-correct tires had. That's all just made-up bul** . I can't get decent tires on my Rx3 on the stock rims because they stopped making anything decent for them about 10 years ago. Unless someone painstakingly recorded grip levels back in the 80 this whole "period correct" argument is ******, we can make educated guesses but that's not reality, it's pure estimations.
I mean, you answered your own question, no need to get so salty. Honestly, my expectation of how the game should handle is that it should be fun while giving you a relative idea of what these cars would do in reality. I don't think for certain cars like the ones I mentioned that the game is able to even do that, it's harsher than reality so it's not really fun. The reason I mentioned period tires is because it's something Assetto Corsa does, and it's not a bad idea.

In the end, driving cars in a game should be fun, but in GT7 it's so sketchy in various cars that it ceases to be. If I accidentally give a car slightly too much throttle mid corner I should be able to catch the car without flailing like a fish.
 
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Sry I missed this.

Yes agree the the 997 GT3 does not exhibit the trademark traction on throttle...will have to try the Nissan. A neutral car with good traction is always ideal.
The 997 handles extremely well and has very good traction on throttle and great turn!
 
This could be negated if the FFB actually warned the driver that the tire was slipping, but it doesn't. It just gives you steering weight for lateral G-forces and wobbles if you hit a kerb/grass, no sense of weight of the car in the wheel at all.
At least on a DD with low INT value (smoothing), slipping is felt very, very clearly - the FFB feels like it starts clipping; it goes from lively, bumpy, crunchy, buzzy to totally smooth. It's like a very clear "edge" in FFB that you need to balance.

My first opinion was that it's ****. But it actually works very well. For me it's much better than the FFB in GTS.
 
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At least on a DD with low INT value (smoothing), slipping is felt very, very clearly - the FFB feels like it starts clipping; it goes from lively, bumpy, crunchy, buzzy to totally smooth. It's like a very clear "edge" in FFB that you need to balance.

My first opinion was that it's ****. But it actually works very well. For me it's much better than the FFB in GTS.
Surprisingly, I am also extremely satisfied with my T248.
 
Surprisingly, I am also extremely satisfied with my T248.
Oh, you can feel it clearly as well? I've been wondering if the sensation can be felt as easily in less expensive wheels.
I wouldn't be surprised if cog mechanisms can communicate more detail than belt mechanisms.
If I increase INT beyond 6, or to the standard at around 11 or beyond, to simulate a smoother rubbery feel, this sensation disappears and it becomes much more difficult to feel that edge, if possible at all.

Has anyone compared T248, G29, T300, TGT, DD? A wheel where that edge can't be felt I wouldn't recommend buying for GT7...
 
Oh, you can feel it clearly as well? I've been wondering if the sensation can be felt as easily in less expensive wheels.
I wouldn't be surprised if cog mechanisms can communicate more detail than belt mechanisms.
If I increase INT beyond 6, or to the standard at around 11 or beyond, to simulate a smoother rubbery feel, this sensation disappears and it becomes much more difficult to feel that edge, if possible at all.

Has anyone compared T248, G29, T300, TGT, DD? A wheel where that edge can't be felt I wouldn't recommend buying for GT7...

Afaik the logitechs have twin motors driving the main cog, makes for a "slop free" connection, except nothing is ever slop free. They are a bit loud and rattely because they effectively try to cancel out the play in the cogs, but the play is still there and it ends up banging the cogs. With the thrustmasters its two belts with different size pulleys to exchange torque/speed from the puny (atleast in my tx racing) motor. I think the belts flex and stretch a bit, even though there are tensioners, and it makes for a "softer" feel.

Dd is the way forward for sure. When i win the lottery im getting a simucube and strapping it to my bent wheelstand xD
 
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