- 664
- Australia
[QUOTE="RMi_wood, post: 13267552, member: 313115"
the torque figure used in power.lut MUST take into account drivetrain loss, which AC automatically takes is 13% or .87.....[/QUOTE]
The first part is true but I'm not so sure on the second part. The power.lut file is torque at the flywheel minus drive train losses, which equals power at the rear wheels. Please note the change from torque to power.
So if I make up two cars each with an identical engine but one with the wheels bolted to the crankshaft and the other using two gearboxes three diffs and reduction hubs, then the first vehicle would have a power.lut that looks much the same as the engine's dyno graph i.e. close to zero drivetrain losses, whereas the second would use the same values but multiplied by lets say 0.5 because of all the extra gears use that much power just to run themselves.
13% is a ballpark figure for modern front engined cars but other arrangements would result is a different multiplier.
That is the torque in power.lut equals the power at the wheels and that number is used by AC to push the car, it doesn't as far as I'm aware need to add 13% because it already has the rear wheel power.
the torque figure used in power.lut MUST take into account drivetrain loss, which AC automatically takes is 13% or .87.....[/QUOTE]
The first part is true but I'm not so sure on the second part. The power.lut file is torque at the flywheel minus drive train losses, which equals power at the rear wheels. Please note the change from torque to power.
So if I make up two cars each with an identical engine but one with the wheels bolted to the crankshaft and the other using two gearboxes three diffs and reduction hubs, then the first vehicle would have a power.lut that looks much the same as the engine's dyno graph i.e. close to zero drivetrain losses, whereas the second would use the same values but multiplied by lets say 0.5 because of all the extra gears use that much power just to run themselves.
13% is a ballpark figure for modern front engined cars but other arrangements would result is a different multiplier.
That is the torque in power.lut equals the power at the wheels and that number is used by AC to push the car, it doesn't as far as I'm aware need to add 13% because it already has the rear wheel power.