the understeer FFB i get just somehow feels too exaggerated in its lightness and also feels like the tyre chatter effect you get with a slick (FM4 car seemingly bobbs around alot) , not a smooth load up scrub on the outside tyre im used to IRL. Very similar to a standard tyre understeering in the wet actually!
I'm not saying that its done 100% correctly, simply that it should be present (as it is with FM4), which was addressing M8DH8X's query as to why it was happening and should it be happening.
Hi Scaff and unv412, hmm interesting explanation there Scaff and understand what your saying but dont get how to translate that diagram.
With the diagram as lateral (sideways) force is placed on the tyre the angle of travel of the car and the tyre start to differ (this is called slip angle and is the number on the red dots) and force starts to build that you can feel as resistance through the steering.
In this example at 400kgs of lateral force the slip angle is 1degree and you can feel 40 Nm of resistance in the wheel, this increases as lateral force builds so at 650kgs of lateral force you have 3degree of slip and just over 100Nm of resistance in the steering.
However once we get past this point you can see that for tiny increases in lateral force we are getting quicker increases in slip angle and a rapid fall of steering resistance. So by the time we get to 775kgs of lateral load and 6 degree of slip (the limits for this tyre) we have only 20Nm of resistance in the steering.
Note also how the steering resistance builds up slowly, taking an increase of 500kgs of lateral force to go from 0 to 100Nm, but only another 125kgs of lateral force to go from 100Nm back to 0. The drop off is far quicker than the build (four times quicker and importantly at a point when less experienced drivers may panic as the steering goes light very quickly) and its also important to note that if you want to get the absolute last drop of lateral grip from the tyre you have to drive both with the resistance building and more importantly with it falling very rapidly.
Now it's interesting that you mention your not meant to feel the weight shifting of the car on the wheel. Even though I have experience in driving real cars, I dont however had the luxury of driving sports cars on a track because I would be able to give my direct differences between sim and real life. But... I have watched plenty videos of inside car views of drivers and all of them are constantly fighting with the wheel, now in real life most people would not get that because you need to be going very fast indeed. Example just go on you tube and watch an inside car view of a fast driver around the nurburgring, I say nurburg because the track is not smooth and flat and would be the perfect way to explain what i'm talking about. I think GT5 mimicks this very well and Forza does not implement this at all from my experience. Forza does not seem to have that fight back i'm talking about which I know does exist in driving a fast car really fast, the car will give you a hard time.
I'm not sure how else to explain this to you Scaff but trying to explain the best way I can.
I've driven the 'ring and a number of very bumpy tracks and the wheel doesn't constantly fight you unless you are getting a lot of high-speed suspension movement (so it does for example in rallying). Don't mistake the forces acting upon a driver and causing movement for fighting against the steering, they are very different things indeed. The bumps on the 'ring and in particular rapid deceleration causes a lot of movement in the body, not all of it is coming from the steering at all.
Now it will vary from car to car and track to track, but low speed suspension movement has almost nil impact on steering and steering deflection, high-speed does. Now which a particular bump falls into depends on many factors, but GT5 throws everything (high and low speed) through the wheel and that simply shouldn't happen.
Think about the painted lines you sometimes getting approaching a junction, if you drive over them at slow speed (so the suspension travel velocity is slow) you can't feel them at all, as you increase speed you can feel them through the car but not the suspension and as you get to a certain speed you can feel them through both (so the suspnsion travel velocitry is now fast).
Again FM4 is not prefect in this area, far from it, but its at the very least not throwing in a lot of 'feedback' that simply should not be present.
Here's a great example of a TS030 (so very stiffly sprung):
Notice the movement of the car body on the long straight at Ricard from 41 seconds onwards, very clear and noticeable movement of the car and not a bit of it causing 'fight' through the steering, even some of what appears to be steering movement if you look is the driver being moved around by the car. Every bit of that movement GT puts through the steering as FFB and its shouldn't.