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Old 25-09-2012, 10:34 PM   #1
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'Grip Circle' question

We all know the 'grip circles' on the "Friction" tab of the telemetry...

I know that when you have a red circle, that the tyre has lost grip... What do the yellow and blue lines mean?

I've noticed they're different before, and the yellow is always shorter... but today for the first time I noticed them being at different angles! Why/what is this?

(Situation - landing off the jump near the end of the full Nurburgring lap. Braking, wheel is 'forward', pulling 2.86G turning towards the right though (might have started the turn before the jump... the yellow line is more 'forwards backwards' than the blue line on both rear wheels (by about 10 degrees(, one rear wheel is skidding (blue lines on edge of circle, yellow line outside of the circle), the other one is not (Blue line on edge of circle, yellow line inside the circle)...)
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Old 25-09-2012, 11:13 PM   #2
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I've never studied the telemetry or stats on forza nor do i play it anymore but I thought it was the direction of load greatest applied upon the tyre....


...i'm most likely completely wrong how ever lol
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Old 25-09-2012, 11:42 PM   #3
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Red Circles is a visual of the grip available at each tire, and the blue lines inside them are the amount of grip you are actually asking the tire to produce. This displays a more detailed brake down of the “Friction Circle” type telemetry from the “Body Acceleration” telemetry screen.

If you watch the red circles off the start line, the front ones will get slightly smaller and the back ones will grow. That is because a tire’s grip is related to the amount of weight on that tire more weight = more grip, to an extent. So as you jump on the gas, weight shifts backward, and the rear circles grow because your rear tires have more grip.

When you go into a corner, you will also see the circles change size as weight shifts side-to-side. jump over a curb, and the circles disappear if the tire leaves the ground! The blue line shows how much you are asking of the tire – if it is outside the red circle, it means you are pushing that tire too hard and it has lost grip, so it is sliding. If you look at the telemetry during a spin, the blue lines will be well outside the red circles.

If the blue line is inside the circle, it means that there is more grip available, since the circle is the limit. You are using your tires most effectively when the blue line is touching the red circle.

Notice while Braking which circles are getting bigger, usually the front will get bigger than the rear with the bias > that 50% Front. Keep moving 1% Front till you have lost grip completely skidded out as a result of understeer when braking. Move back 1% to be in the safe zone.
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Old 26-09-2012, 12:00 AM   #4
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I know that much, smokin... I just wonder why the blue and yellow lines aren't in the same direction in this one time, when every other time I've looked they have been
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Old 26-09-2012, 06:37 PM   #5
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The direction of the lines shows the direction of the g-forces being exerted on the wheel. This is affected by sideways forces (lateral g), accelerative forces (longitudinal g) and vertical forces (vertical g).

The combination of these as the car moves around will affect the direction in which each wheel is pushed. Usually, the differences (at least on the same axle) are very small and you won't notice them. In this case, your landing is causing large variations in the g-forces being exerted on each wheel which is leading to differing directions of applied force.
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Old 27-09-2012, 06:17 AM   #6
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Hmm I don't realy bother with the telemetry,always thought it was a bit geeky and sad,that may be why I'm rubbish.
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