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Assetto Corsa Competizione - 2020 Generic discussion

Discussion in 'ACC General Discussions' started by dave967, Oct 22, 2019.

  1. Oblit0r

    Oblit0r Alien

    Track temp has little influence on tire pressures, you should look at ambient temperatures.

    You can try it out for yourself tho. Open a hotstint or practice session (not hotlap) and aim for a 20-20C degree ambient & track. Drive 5 laps and record it with MoTeC. Check the readings in MoTeC and adjust the tire pressures so that the average pressures are where you want them to be. Drive another 5 laps and re-check the pressures in MoTeC to make sure they're correct.
    Then enter another session but somewhere in the middle of the night with low ambient temperature (you can go down to 2-2C). I haven't been able to succeed in getting the track temperature lower than the ambient temperature. But use the method I mentioned above to set your tire pressures and drive another 5 laps.
    Then enter another session and increase the ambient temperature with a CLEAR sky to heat up the track more and getting a bigger difference in temperatures between ambient and track. Again, use the method I described above and you will notice track temperature barely has an effect on tire pressures.
  2. fsuarez79

    fsuarez79 Simracer

    This rule of thumb has worked very well for me too
  3. m_box97

    m_box97 Simracer

    Not sure what you inteded here, do you mean 20-20 then 2-2 and finally something like 20-25 (ambient-track)?
  4. SimGuy_1

    SimGuy_1 Alien

    I never tested this BUT if it is true then i think it is less realistic;As tyres are in contact with tarmac and this is how heat transfer occurs AND remaining heat is dissipated by ambient air.
    So both ambient and track temp should matter.
  5. Oblit0r

    Oblit0r Alien

    These are 2 MoTeC files with the Audi R8 Evo's default aggressive setup around Paul Ricard using the method I described above. 1 is from a 2-2C ambient & track temperature and the other is 39-51C. Two opposite extremes. I used the method of first creating a 20-20C setup for 27.7psi tires and then adjust the psi by increasing/decreasing them according to the ambient temperature.
    Select the last 2 laps and see what the average tire pressures are.

    This method is accurate enough to jump into a session without having time to drive 5 laps and set your tire pressures.


    Attached Files:

    sissydriver likes this.
  6. Thomas Fun

    Thomas Fun Racer

    edit: nevermind
  7. Oblit0r

    Oblit0r Alien

    I didn't, look at the tire temperatures.
  8. m_box97

    m_box97 Simracer

    Yeah I've just done some quick and dirty testing on my own and it's less sensitive to track than ambient. I never tested deeper as it has also worked for me like you said, jump into the session correct and you are fine. That's probably becuase unless you go crazy with the weather it works fine both ways, but it's definitely more sensitive to air. I'll review all my setups I guess....thanks for the heads-up
    pdf3108 likes this.
  9. sissydriver

    sissydriver Alien

    @Oblit0r - different pressures hot was what i meant. that you aim for example for 27.6 left front and 28.2 right front.
    fsuarez79 likes this.
  10. Oblit0r

    Oblit0r Alien

    Ahh, lol... misread it :p
    sissydriver likes this.
  11. o_O what?
    Vision_Slayer_525 and pdf3108 like this.
  12. Yea, didn't you know that set ups are the only problem of this game and should be reworked asap? If you don't feel like it everything is perfect for you in the game, you fanboy :D:D:D:D:D
    Salvatore Amato likes this.
  13. TurboTomato

    TurboTomato Gamer

    Thanks everyone - I appreciate not being treated like a total idiot for not touching one of the basics.

    Did a very basic test on a couple of MP servers last night - given they're generally very short time formats (15/20mins qually and race) I only had a chance to use default TPs for qually but then went and corrected the TPs based on the HOT pressures aiming to have them at 27.5psi for the race. They seemed to be more consistent in their grip for longer in the race, so it's a start :)
  14. SimGuy_1

    SimGuy_1 Alien

    Hey guys,
    A question about bumpstop rate,I know aris has info on his YT but it is still bit unclear
    Aris says that bumpstop rate value is the force at 10mm of compression.
    My question ->>
    10mm compression of what bumpstop or suspension ?
  15. BTL.357

    BTL.357 Gamer

    That would be bumpstop compression.
  16. SimGuy_1

    SimGuy_1 Alien

    Thanks for answer.
    I thought about that as well that it might be force at 10mm compression of bumpstop
    since bumpstop curve is NOT flat as aris mentioned, so does that mean the whole curve changes after 10mm if i change the bumpstop rate value ?
    while the first 10mm curve remains unaffected ?
  17. [ATF]Shanti

    [ATF]Shanti Simracer

    It's an progressive curve as soon force start to apply at bumpstop
  18. SimGuy_1

    SimGuy_1 Alien

    Yea i know that is why i'm tad bit confused.
    How will the curve look if it only changes after 10mm ?
    Like for example if i stiffen up the bumpstop rate and since it will only effect curve after 10mm does that mean the entire curve changes?
    Will the bumpstop rate affect the maximum last level force of bumpstop?
    or is the 10mm is maximum compression of bumpstop ?
  19. m_box97

    m_box97 Simracer

    I don't think it only effects the curve only after 10mm, they don't give you a rate because it's not linear so they just give you a force at a certain compression. If you stiffen up the bumpstop you change the curve from 0 to max compression. 10mm it's a choice, they could give you the force at 15, 20 or 5 or just call it bumpstop 1,2,3,4... and it would work the same way
    sps_for_race and AndyK70 like this.
  20. SimGuy_1

    SimGuy_1 Alien

    Aris mentioned 10mm compression specifically though.
    I personally would like to think just as you said i.e the value of bumpstop rate affects the curve from 0 to MAX compression.
    Maybe @Aristotelis can clear things up.
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