I told you I'd critique these and I never did, my bad, so here it is.
#1: I really like how you have the audience members looking out at the race cars. Focus is good, but the placement of the cars between those poles is very awkward. I know thats hard to control, I just think it would have looked better if there was more distance between the two cars.
#2: Does nothing for me, the cars are stationary, not much going on, good use of depth with the railing but other than that its not a very exciting photograph.
#3: Good idea, but again, not much going on, I would have tried to get a photo of the pit crew changing a tire.
#4: I like this one, good placement of the cars, good use of the fence to add distance, its just a tiny bit under-exposed.
#5: Great photo, my favourite by far. Good use of a slower shutter to add movement. Good composure and focus is pretty much tack sharp.
Overal I think you over-edited a bit, I know you were trying to go for a film look, but the colours look very fake and un-natural. With film everything looks very natural. I posted a tutorial on how to edit to look like film in the photo cult, definitely check that out.
https://www.newschoolers.com/ns/cult/forumthread/thread_id/666121/
Dan Carr also shoots a lot of racing, check out his blog and portfolio.
http://archive.dancarrphotography.com/portfolio/G0000MXrgFjOmSZY
http://dancarrphotography.com/blog/
^Search 'les 24 du mans' or the '24 hours of le mans'
You should also check out yaer productions:
http://www.yaerproductions.com/
So yah, sorry about being late, I made it extra detailed to make up for it!
Zack.