Physics Engine power VS real power

[Grabarz]

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 ?

 

[garyjpaterson]

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.

 

[Grabarz]

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 ?

 

[ltcars]

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 ?

Use Content Manager

 

[Grabarz]

Use Content Manager

which function ?
You mean to manually change values of power and torque and recalculate power & torque curve ?

 

[ltcars]

which function ?
You mean to manually change values of power and torque and recalculate power & torque curve ?

Yes. It is a bit fiddly but if you got the hang of it rewards you brilliantly!

 

[garyjpaterson]

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 ?

NM, torque, not power KW.

And all the info on turbos is in engine.ini

 

[Grabarz]

NM, torque, not power KW.

And all the info on turbos is in engine.ini

so tell me how it works then write the pattern - I know it's there but how to calculate boost x power = real power

 

[ltcars]

so tell me how it works then write the pattern - I know it's there but how to calculate boost x power = real power

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.