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At The Fly Or At The Wheels

tokai

By tokai,
in General Automotive Discussion

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julion Community Regular

julion

Posted
Posted
whats the kw difference between power at the fly or at the wheels .. its like .. 50kw difference? but in which favour?

cheers :)

Johno

theres more power at the fly then at the wheels. power is lost due to a whole bunch of things, like friction. i'm sure someone will give you a better answer, but theres my 2 cents.

Big Rizza Mentor

Big Rizza

Posted
Posted

You can also have the halfway point and measure power at the hubs, which eliminates power loss through tyre heat/friction, but still has transmission/drivetrain losses, just to complicate things further...

Freddy Kruger Mentor

Freddy Kruger

Posted
Posted
it takes power to turn the gearbox, diff, etc.

on a stock car a very rough conversion is flywheel kw = rear wheel horsepower.

your average drivetrain takes out about 30-40kw.

yeah bout 30-40kw is lost from the flywheel to the rear treads.

MBS206 Grand Master

MBS206

Posted
Posted

It's not a "30-40 KW is lost"

Other wise a car that only pushes say 60KW stock at the fly, would only be 20-30 at the wheels, BUT this isn't so.

What it actually is, is approximately 30% loss in a RWD for an auto

About 25% loss for a RWD in manual

And around 20% is the general give for a FWD car of either manual or auto.

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