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Why is drivetrain loss % of power, not fixed HP?

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665 views 4 replies 4 participants last post by  ignition  
#1 ·
like the title says, why is drivetrain loss a % of how much power the car makes, not a fixed number of HP? sorry if this seems stupid but the concept seems hard for me to understand. EX- a car losses 20 hp to the wheels stock, why would it loose more with double the power, the drivetrain has no more friction or resistance.
 
#2 · (Edited)
the drivetrain does have more resistance. the greater force that is exerted on an object, the greater the frictional force that pushes back. that it is until it reaches it's threshhold of failure.

you obtain a frictional force with a coefficient of friction multiplied by the force being applied. each material has a definite coefficient of friction, so as the force increases, so does the frictional force.
 
#4 ·
theBOMs said:
so then the carrera GT really looses about 120hp to the wheels? that just sounded obsurd to me
The Carrera GT has a fairly efficient drivetrain.

That said, the answer in the above post is correct. It's a matter of friction.