Hello, I'm brand new to this site. I have a number of questions that I can't get answered by anybody. I want to some how create negative pressure under the car to suck the bottom of a car down using Vacuum fans (like the 1970 Chaparral 2J Can-Am racing car ("sucker car"). I has some basic questions regarding a lightweight low-drag car driving in a straight-line: 1.) Does a vacuum underneath a car cause a "drag" on the car? 2.) What is the "perfect amount vacuum" underneath the car to keep it from "lifting" at very high speeds (210+ mph) in a straight-line? 3.) Would too much vacuum slow the cars's acceleration & reduce the potential top speed? 4.) What is more important when talking about "negative pressure" holding a car down...a large surface area or a large volume? 5.) Would creating a "negative pressure" be any different than just any weight to the car? 6.) Also would you have to increase the vacuum under the car as the car increased speed? Any formulas that are related to weight & down-force, acceleration, speed, lift and drag as related to vacuum would be great!!! Thanks a ton. This is related to a "real" project I'm doing. I'm trying to increase downforce without increasing drag (like using a wing).