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Originally Posted by JulianEdgar
Thanks.
Obviously something wrong with those figures, isn't there? You don't get a greater force on the other end of a lever when the fulcrum is near you. I'd imagine that they were the total front and rear figures, not the front lift caused by the rear spoiler, as you imply.
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They did their measurements exactly as yours are done. And setup by the expert at the time, a consulting engineer in Southern California, who specialized in this sort of thing.
They tested both airdams and rear spoilers, at 65, 85, and 115-mph.
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For the Camaro, the rear spoiler by itself generated 125-pounds rear downforce, plus 400-pounds of front lift.
The most stable condition was with just an airdam.
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The Pontiac GTO 'JUDGE', with tail-mounted, elevated spoiler, added front lift, with zero rear downforce.
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The American Motors Javelin's roof-mounted spoiler produced no measurable effect at any speed.
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This is why I mentioned maybe doing front axle loads on your sons car. It's hard to predict what will happen on any given vehicle.