Great to see you are out there trying more! Motorsport photography can be fun - adding that with some film can be a challenge!
For me, the image that stands out the most is number 2. It might not be everyones cup of tea, but I like the static nature of the image and I quite like the framing. If it were me, I'd possibly have the car a bit more towards the left of the frame, but ensure that there is plenty of space to drive into.
One thing that you must watch out when doing motorsport is not to become a 1 trick pony. Its cool when you get that bang on sharp shot, but when every shot is the same, well, it gets a bit monotonous. Mix it up. Do high shutter stuff. But also don't be afraid to drop down to 1/60th and do some panning.
Also, like any other photography, watch your foregrounds and backgrounds and try and eliminate some of the distractions where possible. I know, its not the easiest thing to do when you have limited access or there are lot of distractions, but keep it in mind when choosing where to stand.
Keep up the good work.