What is a full power test rig?

[gabuzubee]

What is a "full power test rig" in motor racing? I don't quite understand what "full power" means, are normal rigs only using half power? Or does it refer to the tested car?
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[strad]

?????
http://www.grandprix.com/ft/ftpw006.html

[Giblet]

Where did you hear this term? Some context might be able to help you with an answer or if you have been misinformed by some bad info or someone who doesn't know what they are talking about.