Kind of like airplane wings is what I think they mean.
Correct, so the actual pressure is limited to a small fraction of the current air pressure. By using the fan for thrust downward. the thrust is not limited. but is dependent of the amount of air that can be moved. Think turbojet engine!
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air that can be moved... tks!
But, I wasnt trying to fly, I was trying to stick to the ground. My weight is insufficient to go at high speeds, Thats why I want more downward thrust
So you turn the airfoil shape upside down...
The new motor and fan and the battery to power it will provide the extra weight for your car. Then it can go faster!
You really need to go back and study basic physics........ 
Check out how suction fans are used in exactly this suggested application and have become an essential component in the international MicroMouse competition.
Great Veritasium video on the history and development of this cutting edge competition below. The suction fans make their appearance about 20 minutes into the video. They rapidly became dominant.
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Thanks
Did Mighty Mouse rob Rush of royalties for the Fly By Night riff?
Very cool robots.
So what my original question was, suppose i have put in a fan. We know every dc motor creates a fluctuating rpm. Now, suppose that I go at high speeds, and the fan is running. Do I need to keep the fan speed constant? Like, do i need an encoder to keep at constant speed, or can i just let it run by directly connecting it 12V. My idea was that at a sufficient level of rpm, fluctuations just wont make any difference. Is that right?
Probably not, but try it and see. As you learned from the Micromouse video, drone motors and fans powered by 3.7V develop the equivalent of about 5g of downward acceleration.
The relevant concept from physics is that static friction is proportional to the normal force.
I was also thinking about this, if my motors can run at a force of 5g, 5.2g or 4.8 g wouldn't be a problem. Will try first and then report back.
High speed micro mouse?
Scaling something up can be a great way to learn that growing volume by the cube of what areas (like cross section structure that gives strength) only increase by squares often works out poorly.
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If you can achieve those degrees of force with fans, consider using only air to propel your vehicle, the wheels only support it vertically, they could even just be nylon stubs.
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