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Power, Coast and Preload

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  • Power, Coast and Preload

    Found this over at Nogripracing => http://www.nogripracing.com/forum/sh...ad.php?t=10023


    First off, make adjustments to the suspension first to adjust the car's handling...

    Then,
    Increasing the POWER values will make the car "tighter" when accelerating out a corner...
    Decreasing the POWER values will make the car "looser" when accelerating out a corner...

    Increasing the COAST values will make the car "tighter" when braking into a corner...
    Decreasing the COAST values will make the car "looser" when braking into a corner...

    The preload makes the diff work quicker when increased or not so quick when decreased.
    The power/coast settings are going to do what they do, only in a shorter time or a longer time.
    and also

    Coast: You are approaching a corner and brake into it, as you start to turn the weight transfer throws the car to one side. As a result of this you have a wheel that is unloading and the other is loading. If the diff coast side is set to low it will lock the diff and make the unloaded wheel spin up because the diff is sending a similar amount of force or torque to both wheels and because its unloaded it will obviously have less grip grip and the wheel that is loaded will have a similar amount of force but because it is loaded it will have more grip. As you start to turn into the corner you will get lift off oversteer or snap oversteer, especially if you are down shifting. So essentially the wheel that is on the outside is turning at the same speed as the wheel on the inside. Where ideally you want the outside turning faster than the inside wheel because it has further to travel. But if you have a good set up car this will produce understeer as the car has grip to both wheels because the diff is sending the same amount off force to both wheels and the car will just get pushed to the outside of the track. Where as you need the inside wheel turning slower than the outside wheel.

    Power: This is the same principle as Coast but obviously on turn exit. You have one wheel loading and the other unloading. On turn exit this will create power oversteer because the outside wheel is loaded and has grip and the inside wheel is unloaded and has less grip. With a good set up car the same thing as I mentioned above will happen. As you take the apex you put the power back on and the car just wants to go straight on. This is because the Power side of the diff is sending a similar amount of force to both wheels and its just pushing the car straight ahead. Same again, you want the outside wheel turning slightly faster than inside wheel.

    If you get 2 pens together and draw an elongated U on a peice of paper. One represents the inside wheel and the other is the ouside wheel. As you can see the outside wheel has further to travel and needs turn at a faster rate where as the inside wheel has less further to travel and needs to turn at a slower rate.
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