Pics at Drag Races

Back to the same old problem .
Went to the drag races yesterday and not impressed with the pics
Some turned out, most didn't
I was shooting with the 100-400 and was at the 100mm setting
I was at the top of the grandstand so I couldn't get any further away
Camera was at 100 ISO, 1/80 sec on aperture priority
I want to go back this afternoon but not to take pics like this
What did I do wrong ?
Thanks in advance

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

HTTP response: 404 | MIME changed to 'image/gif' | Byte size: ZERO | PHOTOBUCKET ERROR IMAGE

you are shooting way to slow try shooting at 4.0 av and make sure you are shooting atleast 200-400

Panning is a learned skill. Just keep at it. But you're handicapping yourself by shooting at 1/60 and 1/80 sec. Raise your ISO to the highest that you can without noise becoming objectionable. And open up the lens from F/7.1

If you have IS on your lens, unless you can apply it selectively to the vertical plane, turn it off. On many lenses it will fight you if you're panning.

First shoot with moving cars need advice.