I broke four bones in my foot and a dislocationit was treated with surgery and plates and screws. Will it be healed in six weeks enough to race my dir?

Probably Not. While bones generally heal in 4-6 weeks time, it sounds like you sustained a fairly significant injury and there will be still healing of the soft tissues and strengthening of the bone. I would suggest also speaking with the surgeon who repaired your injuries for a more complete picture of healing time frame.
Ask your orthopedist. Your surgeon just got up close and personal with your foot. Ask him/her to give you an estimate of when you are able to walk, run, race.
Fracture. Your best source of information is your surgeon - he / she has the x rays and knows you and your case best . Good luck.