I built a gocart frame for racing on my track out in the back field. I used thin wall square tubing for the painted parts, and found a bunch of pre-bent chrome shelving units for the bumpers and nerf bars in a dumpster behind a resturaunt I parked behind. We ran slightly modified alcohol Briggs Raptor 5 HP motors, and twisted them about 6000 RPM.
We would start watering the track with my feild sprayer about 8:00 in the evening in the Summer, and end up putting about 1000 gallons down while working it in with atvs. After dark, a buddy had a industrial generator with a light stand that lit the whole track. After the sun went down, the track would get super sticky and we could run about 40 MPH and not lift for the corners (just slight understeer)......a whole bunch of fun and loud too !