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Physics Engine power VS real power

Discussion in 'Assetto Corsa Modding Discussions' started by Grabarz, Apr 7, 2017.

  1. Grabarz

    Grabarz

    Messages:
    64
    Ratings:
    +11
    Hello once again, I have few questions about Horsepower of the car:

    some types of car got 2 files of power "Power.lut" and "Power_ORI.lut" meanwhile other cars got just one "Power.lut" - Can You explain why there is the second file and for what purpose ?

    even more confusing are values written in those files ...
    5500|286 <- first value means RPM second the power at current RPM but which unit of measure?
    kW?, BHP?, HP at the crankshaft ?

    I took McLaren 650 GT3 as example since description says it has 500 hp/500 Nm

    0|100
    500|206
    1000|210
    1500|197
    2000|208
    2500|219
    3000|229
    3500|270
    4000|275
    4500|279
    5000|285
    5500|286
    6000|285
    6500|286
    7000|286
    7500|276
    8000|171
    8500|0

    286 x 1,36 ( simple horsepower multiplicator ) = 389 horsepower - 111 are missing ?

    so i tried different method - in most games speed and power are calculated by Nm*RPM
    9.5488 x Power (kW) / Speed (RPM)
    9.5488 x 286 (kW) / 5500 (RPM) =0,496... = 496 Nm
    nice more real but still 4 Nm are missing

    http://www.wentec.com/unipower/calculators/power_torque.asp

    i tried many times many different options ... Is it even possible to make Horsepower equal to Torque ?


     
  2. garyjpaterson

    garyjpaterson

    Messages:
    1,254
    Ratings:
    +2,235
    RPM|torque (NM).

    This is measured at the wheel, so will be lower than the claimed figures (which are measured at the crank). Typically around 10-20% loss, though your mileage may vary.

    As for why some cars have a separate file (never seen this myself, frankly), I'd guess this is the torque at the crank, the power.ini is after adjustments.

    AC only reads power.ini so don't worry about the other file.

    edit*

    Oh, and I should note, these numbers are before turbo's, so that example you give of the 650S, the Turbo(s) will increase the actual torque. The torque used in power.ini is effectively the N/A values.
     
  3. Grabarz

    Grabarz

    Messages:
    64
    Ratings:
    +11
    Well ok i could agree but
    AC power loss for all cars is 13% from crank to wheels that means even if we multiplicate 286 kW x1.13 that gives us 323 kW still too low ( 368kW = 500 HP )

    Nissan R34 V-Spec II, Power_ORI:

    -3000|100
    -250|100
    0|100
    500|120
    1000|124
    1500|129
    2000|197
    2500|238
    3000|281
    3500|306
    3750|310
    4000|304
    4500|300
    5000|302
    5500|288
    6000|280
    6500|274
    6700|267
    6800|264
    7000|256
    7250|246
    7500|213
    8000|0


    and one more is there any way to calculate Power delivered by engine and Turbo(s) ? any type of mathematical pattern or something ?
     
  4. ltcars

    ltcars

    Messages:
    617
    Ratings:
    +299
    Use Content Manager
     
  5. Grabarz

    Grabarz

    Messages:
    64
    Ratings:
    +11
    which function ?
    You mean to manually change values of power and torque and recalculate power & torque curve ?
     
  6. ltcars

    ltcars

    Messages:
    617
    Ratings:
    +299
    Yes. It is a bit fiddly but if you got the hang of it rewards you brilliantly!
     
  7. garyjpaterson

    garyjpaterson

    Messages:
    1,254
    Ratings:
    +2,235
    NM, torque, not power KW.

    And all the info on turbos is in engine.ini
     
  8. Grabarz

    Grabarz

    Messages:
    64
    Ratings:
    +11
    so tell me how it works then write the pattern - I know it's there but how to calculate boost x power = real power
     
  9. ltcars

    ltcars

    Messages:
    617
    Ratings:
    +299
    Try and error. If not, look at the explanation: Maximum boost generated. This value is never exceeded and multiply the torque like T=T*(1.0 + boost), so a boost of 2 will give you 3 times the torque at a given rpm.
     
    • Agree Agree x 1