Could you please explain to me exactly how watching videos has given you an idea of how a car feels and the myriad of possible behaviour traits that exist in reality as a result of doing so?
You can see from steering inputs and how the car is reacting is from them, the surroundings, the speed the driver is taking into corners and the racing line, the sound and if there is onboard footwork or telemetry, you can see where a driver is losing time compared to another if there is videos of other drivers on the same circuit (Something like F1 qualifying).
It is similar to watching replays of say the fastest times in a time trial. You can see immediately what someone is doing to go that fast so you know straight away what you need to do. It saves me a lot of time anyway.
This could be a test for you. Can you for example drive with no force feedback and no sound in cockpit view reasonably competitive in a time trial, say something like in top 250 or whatever is competitive for you? I know I can and that is due to knowing what the car is going to do before it happens relying on visual cues, the speed I know I need to take a corner and the steering input required. If you struggle then I think it will be hard for you to understand how watching videos can help if you cant work on visual cues.
I haven't dismissed the videos at all, what I have said is that they do not replace real world experience and I questioned why you place them above it.
I've also raised a concern about how they are used in a bias manner to try and prove a point. Let take a better look at the first MR2 video as it illustrates this very well.
Now you have said that a fully loaded rear (I presume you mean driven rear by this) hits grass it should cause a problem for the driver.
So why didn't this cause a loss of control..
...that's a loaded rear on the grass. I know it must be because its not on the grass enough. How about this one...
or this one (silver MR2 on the right in front)
or this (same silver car)
All of those drivers put a driven rear tyre, most under acceleration on grass, none of them lost control. The only crash in that video was the result of a control loss on track that ended up on the grass.
So no I don't dismiss the video 'evidence', but what I do actually do it watch it fully.
Same reason why such situations in GT5 will not cause a loss of control in GT5, there is not enough lateral load on the rear tyres to cause such behaviour to happen, steering wheel is most likely straight. GT5 as I already mentioned is more forgiving than real life in that department. I did mean driven rear. The driver most likely backed off throttle as he realised he was going to go off track, being a MR2, it might have got a bit of lift-off oversteer which would have been easily catchable if it werent for the grass. The rear tyre laterally loaded on the grass was the thing that caused the loss of control. If driver just carried straight on to the grass, he wouldnt have such a problem just like in GT5.
Have a look at this video:
http://www.youtube.com/watch?v=n321OygW-kg
You can see grass being used quite often without loss of control. Can you explain why the drivers in GT5 are not losing control when going on the grass?
Soon as F1 is back, I will use some old examples and if you watched F1 practice and qualifying this weekend then you will know similar things happened again.
Look at this video at 1:44 onwards to see Barrichello lose control on the grass.
http://news.bbc.co.uk/sport1/hi/motorsport/formula_one/9436868.stm
Look also 1:29 onwards on this video.
http://www.bbc.co.uk/sport/0/formula-one/15212223
This is the first video that comes up when you type in GT5 grass in YouTube:
http://www.youtube.com/watch?v=xYKngx3JsOg
There is a reason why drivers dont take liberties with grass and that is because it is extremely unforgiving especially in performance situations if you dont know you are going on to the grass. If you do know you are going on grass and have time to react, as Vettel has shown you can take the lateral load of the tyre before going off and not have such problems. Same as in GT5 but GT5 is much more simplified in off track behaviour which makes it more forgiving than real life in most situations. Hopefully they keep on the current track they are on regarding track edges and not dumbing it down (You could argue it is already dumbed down) but making it much more detailed. It should also help rally physics if they do improve this area.
Soon as Im on the topic of F1 and off track behaviour, I recently did the Spa seasonal time trial and if you see my replay on there (If it is still up to view), you will be able to see me go off track (Silly error) without loss of control but loss of speed with the F2007. I dont touch grass that much though so probably a poor example but from experience driving the car around the track and having gone on grass, you can go full throttle on grass without losing control. You can have high lateral load on rear and lose control. You can brake marginally on grass without losing control and you can brake heavily on grass and be facing the opposite direction of the race track. One thing to remember when going off track is to try and take as much lateral load of the tyre by straightening the steering wheel. Soon as this is a FM Vs GT thread, F1 cars is a thing that adds to the variety of experiences in GT5 that cannot be experienced in Forza 4.
In mean modelled to act consistently as grass, not as some strange version of tarmac as it does in both titles, my apologies if that was not clear.
I also find it rather strange that you keep posting as if I don't have GT5 or don't play it, as I most certainly do and am more than aware of how it reacts in terms of grass.
You can watch all the videos you want, they will not let you know how a car feels and reacts when you transfer from track to grass. I do know how that feels, I know how it varies and GT5 doesn't get it right. I find the very fact that you agree that you can actually gain speed on GT5's grass and yet then say they do a reasonable job of grass quite amazing.
Oh and yes I am more than aware of the corner cutting penalties in GT5, the ones that will give you a penalty if someone else forces you off track, making them about as fair as Forza's sticky grass in that regard.
Scaff
OK then.
You probably play GT5 more than me for all I know (I just try and do the seasonal events when I can). However playing on a game does not automatically mean you know what is happening in the games driving model. It usually takes me about a good 10-20 minutes now to have a very good understanding of what is going on in any racing game unless it is got some bugs which change things. I remember when I first got Forza 3, I was a bit shocked not many people said about the active steering being permanently on which I found out due to being surprised about not losing control of cars after driving deliberately very poorly around a circuit. Even video evidence was not enough proof for some to acknowledge it at the time.
Your understanding of how cars react to grass in GT5 appears to be lacking. Same goes from before about how you say comfort tyres are not that progressive. I have done very limited testing on white lines so not 100% on this but it appears also they do not affect you in the wet. I suggest you go and play GT5 and understand what really is going on before making comments that is always going to be difficult to prove especially if there is lacking evidence on the whole of the internet showing the behaviour you describe.
Surely though you must find it strange that real world videos or GT5 videos do not back up your claim. It does show GT5 is a bit forgiving as far as track edge goes for the most part and the rest of grass behaviour is extremely forgiving. I dont know about gaining speed on the grass but you can use the grass as good as tarmac through the corners. Read what I said in that post. I did say rear loaded tyre on the edge of grass is what is simulated reasonably. I should have added the word lateral in that too so my mistake and should have also mentioned about braking on grass being reasonably simulated.
Finally Im interested in why you think that Cobra video launch behaviour you posted is what Forza 4 has over GT5 in physics department that makes it much better. Considering FM2 and FM3 will do the same thing I presume and most likely something like a Pagani C12 will also result in the same outcome, why do you rate GT5 physics above the older Forza games? Otherwise I could go on Forza 2 make a video of the Cobra doing the same thing and say the following like yourself, "Try this in GT5 and then when you can't, come back and tell me how GT5 still has the better physics engine."