I don't think it possible.....
You have to travel faster than the speed of light
But what I have read as you near the speed of light and at the exact speed, weights of objects change and stretch or shrink
but if you were traveling a little over the speed of light and traveling back in time, how fast would time reverse, and do you and your vehicle stand still in time as things change around you, if they did it would be like the movie time machine and buildings would start to appear around you that wern't there in the future where you are from because they were taken down say in the past.

.now if you stopped your machine and came out in the past you could end up interrrupting the past, the past is already written, so if you think about it...say a family driving in a car had crashed and everyone was lossed say in 1960 , where you now are, and since you were there they slammed on the brakes because of you walking in the road a block before the supposed accident was supposed to take place, therefore the family would not have a crash and died, this would create a paradox which messes up the space time continuem causing everything to erase and there would be no more(thats the tricky part that no one knows what will happen if this did happen) now that family would be alive and all those people going to a funeral would no longer go to a funeral and all events that took place due to that single car accident would never take place and everything would be messed up in all future events 1 sec after that one event occured, now think...there would be no ambulance on the scene which would cause other cars to pull over maybe one pulling over would run over a dog on a curb which would later maybe eat a cat which was supposed to be later that night sleeping near a backdoor that was being broken in by a robber that meowed to wake up another family so they would be save from the robber which then was caught then sent to Jail, all those events would not tanke place because of you.........kind of corney ....so thats what I think anyone else think the same as me