The more cars run the bottom groove and less that run the top, sometimes the high groove doesn't come in until later on.Īs it continues to dry out and more laps that are turned on it it continues to pack the surface down further it will develop a ridge around the top that's like a curb that we call a "cushion" that race cars will rub their right rear off of and get grip from, although it can also be treacherous to run up there. They can also kick up bits of dirt to the higher line/groove on the track which can lead to it being harder to get some grip up there (it's like marbles on an asphalt/tarmac circuit until packed down/stuck together). The surface is obviously not hard-packed in the video. In the above video it's basically the sprint car going around laying down indentions/tire tracks from the tires. They then call the actual race cars out to wheelpack which is a similar process which helps try to use the weight of the car and the cars tires to smooth off or pack the surface down before racing. They will send what they call pack trucks (basically a bunch of trucks with big tires) out on the track to pack it down and as the trucks turn laps the tires will lay down grooves. Generally speaking in a real world setting when they use moisture the surface will start off a bit softer and more malleable. They can prep it dryer (goal to get it to go slick) or they can prep it with more moisture. When they prep the track, there's 2 different ways they can prep it. Road circuits with sand/gravel traps where the wheels dig in and lay grooves/ruts as the car drives through.Ĭlick to expand.Dirt ovals work sort of like this: Even road racing circuits with grass surfaces where a car runs off can develop ruts. The above is advantageous to not just dirt oval racing but all forms of rally (point to point rallying as well as rallycross) and off-road racing. the coefficient of friction increases, as rubber on rubber = high degrees of friction, which means more grip. It also goes from a heavy track surface that is harder to negotiate to packed and faster, then gives up grip (moisture leaves the dirt so it gives up grip) by drying out, then becomes more polished off in a surface we term as "slicked-off" (even less grip), and then finally the surface can develop heat from the tires repeatedly turning laps in the same spot causing the tires to melt to the surface. Over the course of the laps, the surface is rutted from the tires driving over the surface repeatedly.
#Dirt 4 forums series#
The time lapse video below is an example of the World Racing Series Winged Sprint Car on a dirt oval track with simulated surface model deterioration.
This is where both might potentially have the advantage over what Studio 397 has today. but when the rubber meets the road, not all roads are a rigidly asphalt surface. Tires = hugely important, as is the physics engine when it comes to suspension.
You already have the overall edge in terms of physics with the suspension and tire model at this point, but PiBoSo and iRacing both have the surface model advantage today.
If RFactor 2's Real Road surface engine could be updated to be as advanced as what PiBoSo has with World Racing Series ( ) that would be great.
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