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PC Oversteer when throttle lifted

Discussion in 'Assetto Corsa' started by Daniel Green, Jul 20, 2014.

  1. Hi guys just wondering what you would do to a car that is loosing the rear end when I enter a fast corner as soon as I lift throttle.
    The car generally drives fast and handles well every where else but if I make a sudden movement off throttle when entering corner the back end swings round and trys to hit me in the face faster than I dont no what
     
  2. Sounds like the mp4 12c gt3 . If so you need to get to work on your setup.
     
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  3. hahahah no way how did you no that. Ive tried a few things but its always there
     
  4. As a mid-engined car, the McLaren GT3 is naturally prone to lift-off oversteer. Have driven this car personally a lot.

    Things you can do to limit or eliminate the so called 'lift-off oversteer'

    Driving
    • lift off the brake more carefully at the end of the braking zone
    • apply less steering at corner entry
    • brake earlier and accelerate earlier
    • no tail-braking, brake in a straight line
    • apply a bit of throttle while going off the brakes to stabilise the rear
    Setup
    • raise rear wing
    • reduce front camber
    • increase front springs / lower rear's
    • increase front dampers / lower rear's
    • try the 'first-' dampers first, they have a smaller effect on handling than the 'bound' and 'rebound' dampers
    • apply more positive toe at the rear - be careful, the car will understeer more
    • reduce value of the acceleration differential ('diff power')
    • increase braking differential ('diff coast')
    • put more brake bias to the front
    • increase ARB in the front / reduce at the rear
    Of course you don't have to do all of the above all at once, try one, if it helps, that's great. If not, try an additional one.
    For further information: link
     
    Last edited: Jul 20, 2014
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  5. Thanks Georg just what I was looking for when you say increase it means to stiffen them ?
     
  6. LOL because i had that exact same problem ,never really encountered it with any other car . I think lowering the coasting diff also may help . Im ok with it now but it took me some setting up to iron it out . Dont let it put you off the mp4 tho its smart to drive when blanced.
     
  7. yes, for dampers and springs
     
  8. 1) lift off the throttle easier.
    2) blend throttle lift and braking application
    3) very easy on brake application
    4) your setup won't make much of a difference, it's you

    smooth is fast
     
  9. Apply the brake whilst still on the throttle, then lift off the throttle gently, but not all the way, leave maybe 10-20% throttle through all braking. Makes getting on the power in certain situations easier too, but it's very situational. You need to load up the axles gently, drive smooth if possible.

    Likewise if you need to get on the brakes slightly for a corner, don't lift off the gas, just dab the brakes.
     
  10. I'm sorry but with all my experience, this is not true.
    All the points I wrote under Setup make a difference, that's for sure.
     
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  11. I've never had any issues with lift off oversteer in the 12C, but then again I'm prob too slow for that :p
     
  12. Easiest solution for MP4 is to put diff coast really high.
    Other than that, Georg's guide is da bomb! :)
     
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  13. Turk

    Turk
    Premium Member

    If you haven't already watch "Skip barbers school of racing" on youtube. What your describing is lift off oversteer, all cars are susceptible to it but some cars are more susceptible than others. Front wheel drives are particularly susceptible to it but once you're aware of the phenomenon you can use it to your advantage.

    I find it helps to think of the car as a seesaw, with the fulcrum in the middle of the car (or under the driver) and a guy on the left representing the front end and a guy on the right representing the rear of the car. When you brake the guy on the front of the seesaw goes down putting more weight on the front tyres and less at the back, as the guy on the back is getting lifted into the air (meaning the front is gaining grip and the back is losing grip). This works the other way too, when you're accelerating your tipping the seesaw back onto the back tyres and losing grip at the front. This is why you'll understeer accelerating out of some corners.

    Once you're aware of this you can not only avoid it but use it to help you rotate the car without any changes in steering lock. In front wheel drives you can use it pretty aggressively without the car actually spinning.
     
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  14. Frederic Schornstein

    Frederic Schornstein
    TXL Racing Premium Member

    Trailing throttle while braking is usually a pretty bad habbit and does solve the porblem in a bad way as you compromise braking power and fuel economy.
    In some fast corners with really small braking zones it is ok, but not in braking zones longer than 30 meters or so.
     
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  15. Its a fact:
    some cars in assetto have way too much oversteer by default.
    the game should provide more feedback to the steering wheel or simply reduce the amount of oversteer AT ONCE!!!!
     
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