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GTC-TC-76 BMW2002tii @ Kyalami / Oesterreichring - Thu 16th May 2013

Discussion in 'GT Legends' started by Rupe Wilson, May 8, 2013.

  1. Rupe Wilson

    Rupe Wilson
    Senior HistorX club driver Staff Premium

    Class: GTC76 BMW2002tii ( Download )
    Track: Kyalami 70 (Download) / Oesterreichring 70 (Download)

    See Main Forum for Official Race Time Clock

    Practice start time: GMT 19.00 (20 mins)
    Qualification start time: GMT 19.20 (single lap)
    Race start time: GMT 19.30 ( 14 laps)
    Practice start time: GMT 20.00 (20 mins)
    Qualification start time: GMT 20.20 (single lap)
    Race start time: GMT 20.30 ( 14 laps )

    Note 1: Race 1 we will use theKyalami 70 circuit
    Race 2 we will use the Oesterreichring 70 circuit
    Note 2: We are using the BMW2002tii model that is car
    #5,#31,#51,# 58,#72,#77,#91,#105,#112,#202,#203,#207
    Note 3: only the skins that come with the mod please, and lets try and use all the liveries for a colourful grid.
    Note 4: Unpack the mod into your main GT Legends folder
    Note 5: We are using the SIMBIN lobby for this event. See here how to switch lobby
    Note 6: We run a superpole qually, you get one chance only at a outlap and qually lap. Take it easy on your outlap and get you car in a good position to run you qually lap, leave enough room to allow for the unexpected from the car infront
    you don't get another go if you have to take avoiding action..
    Note 6: Racing Room must be given to all driversand this works both ways.Divebombing into and across a corner denies people the chance to make the corner correctly just as much as someone obliviously (or deliberately) cutting the nose off of another driver who has achieved partial overlap fairly. AndThe kerbs are not deemed as track, therefore 2 wheels must be within the white lines, on the tarmac, At All Times..

    Server password: click here
    Racing rules: click here

    Entry List:
    1. Rupe Wilson #105
    2. Paul Bennett #72
    3. Senad Subasic #51
    4. Antonio Tavares
    5. Sakis Politis #91
    6. Knut Omdal Tveito #58
    7. Antonio Tavares #31
    8. Steven Walkerr
    9. Hans Sneep #112
    10. Brian Harlow
    11. Alex Prescott
    12. Marcin Piatkiewicz #5
    13. Brian Wallace
    14. Eck Simpson
    15. Roland Warmenhoven ?
    16. Rene van Zijp
    17. Ross McGregor
    18. Hiroshi Awazu
    19. Driver
    20. Driver
    21. Driver
    22. Driver

    This is being held in our Club, using Club Rules, and should be driven in that spirit.
  2. Paul Bennett

    Paul Bennett

    Yes please Rupe # 72
  3. Uh, I'd like to join this one please, brilliant car. #51
  4. Pls sign me up, Rupe
  5. Count me in. Car #91
  6. Rupe Wilson

    Rupe Wilson
    Senior HistorX club driver Staff Premium

    The last time we races these car they were so good, one of the best mods ive driven in any sim i think..
  7. I'm pretty sure I can make it. #58 please
  8. #31 for me pls, Rupe
  9. Rupe Wilson

    Rupe Wilson
    Senior HistorX club driver Staff Premium

  10. What an excellent choice of tracks. Not only they are high speed tracks (my favorite), but also we'll probably be able to use the same setup for both, as I seem to recall that they have similar characteristics.
    • Like Like x 1
  11. Rupe Wilson

    Rupe Wilson
    Senior HistorX club driver Staff Premium

    We have used these track before in previous events. then we brought them together and never looked back.
    Certain track car combos just work so well its finding them, luckily for me Stuart and Knut did such a great job previously. All i can say is its made my job a lot easier as i have a great archive to look through and test and compare with..
    But you just know form about the 3rd lap of testing if its good...
    You get that tingly feeling down below:rolleyes::whistling:
    • Like Like x 3
  12. Paul Bennett

    Paul Bennett

    Rupe Wilson, like James May that fizzy feeling ? :D
    • Like Like x 1
  13. A night at the track.

    Tonight I made the first contact with the BMW at Kyalami. I know this track quite well, although in the ABB version, which is quite similar; but not the BMW. Besides the initial difficulties in figuring out the car behavior, I was confronted with another one: there are 3 different tires to choose from! After some laps to adjust the car, my strategy was this: I tryed each set of tires one at a time, doing some laps with each one to adjust tire pressures and taking notes of pressures, temperatures and lap times. The results (unpolished) were as follows:

    The laps times were quite similar with all tires, but there are differences in the handling characteristics of the car. Overall, my best time was achieved with the Dunlop Historic, the second best with the Dunlop (+ 0,3 secs) and the Goodyears gave me the slowest time (+ 0,6 roughly), but were also the ones I tested less.
    My general impression is that the the Goodyear are the tires with more grip, but they are also the most difficult to drive because their behavior is more abrupt. When grip is lost, it's difficult to control the car.(a)

    The Dunlop and the Dunlop Historic are more alike, but perhaps the easiest to drive, because it's more predictable and less abrupt, is the Historic. As I mentioned, my best time was with the Dunlop Historic, perhaps due to the fact that they need significantly more pressure to operate under correct temperatures than the Dunlop/Goodyear and Kyalami is a high speed track where more pressure helps the car going faster on straights. Both the Dunlop and the Goodyears require significantly less pressure. But perhaps with more practice I would have been able to take advantage of the extra grip of the Dunlop or the Goodyears?

    Looking at the tire file, we find these values:

    Dunlop Historic
    DryLatLong=(1.485, 1.490) // Lateral/longitudinal coefficients in dry weather
    DryLatLong=(1.495, 1.500)

    DryLatLong=(1.515, 1.521) // Lateral/longitudinal coefficients in dry weather
    DryLatLong=(1.527, 1.530)

    DryLatLong=(1.510, 1.516) // Lateral/longitudinal coefficients in dry weather
    DryLatLong=(1.527, 1.530)

    I'm no expert, but I think these values refer to the coefficient of friction of the tires, and the higher the more grip they have.

    And these are roughly the pressure/temperature values (on the left side) I had after finishing 2 laps, taken right after crossing the start-finish line:

    Dunlop Historic:
    FRONT LEFT 72-72-74 ºC @172 kPa (146 cold)
    REAR LEFT 80-80-82 ºC @175 kPa (146 cold)

    FRONT LEFT 68-70-70 ºC / @148 kPa (122 cold)
    REAR LEFT 77-80-80 ºC @ 154 kPa (124 cold)

    FRONT LEFT 75-75-77 ªC / @146 kPa (124 cold)
    REAR LEFT 83-84-86 ºC @151 kPa (126 cold)

    Looking at these results, maybe the Goodyears, given the fact that tire pressure is similar to the Dunlop, need more laps to go into the optimal temperature ranges? (a) Next time I'll try to find out...

    About the car setup, default is not bad and I didn't make major changes, except for tire pressure depending on tire model. Basically increased differential values to 40/40, because with default settings (25/25 I believe) there was too much wheel spin under acceleration and a little more coast made the car more stable under braking and at turn-in; added more caster and camber 8especially at front) and stretched the gearbox to the longer ratio.
    • Like Like x 6
  14. Very interesting thoughts and results Antonio, well done! Haven't stepped foot yet on either track and i don't know the car at all because I train for Tuesday's race. I will surely use your results as a guide.:)
    • Like Like x 1
  15. Tim Ling

    Tim Ling
    It's a million-to-1 chance, but it just might work Premium

    Antonio Tavares Wow, that's a lot of serious preparation there Antonio! I doff my cap to you sir :thumbsup:
    • Like Like x 1
  16. Steven Walker

    Steven Walker
    Slowly getting better! Premium

    I'd also like a crack at this so sign me up for the evening please. I know the tracks but not the car so i'll be tweaking until thursday.
  17. Hans Sneep

    Hans Sneep

    Signing up #112
    • Like Like x 1
  18. Should be there, knee permitting. Just dump me in the back, somewhere, Rupe!
  19. I'll be on the server for some practice from aprox. GMT 20.30, if anyone care to join
    • Like Like x 1
  20. I will try to be there.
    • Like Like x 1