Thanks everybody! And thanks Rev, I am still figuring some things out with it. I think you have to take your shot according to what you can do in photoshop. And speaking of tutorials, I have breifly come up with one on the cut and paste wheel method that has been requested.
CUTTING AND PASTING BLURRED WHEELS FROM SEPERATE SHOTS
Step One:
Take 3 shots with the arperature all the way up to 22. One focused on the front wheel with low shutter speed. (1/60 - 1/200) One focused on the rear wheel with low shutter speed. (1/60 - 1/200) And one focused on the car with 1/4000 shutter speed. Make sure you remember where the [+] cursor is on the picture so you can referece where to move it back to after you focus on the wheels. Also, keep in mind the mm you are shooting the shot at in case you have to zoom in or out to get focused properly on the wheels. That being said, here are three shots I took:
Step Two:
Make a selection around your wheels in the blurred shots with an edge feather of 1. You don't have to be exact unless there are details on the tires like letters or white walls or something like that. Than just drag them from the shot you selected it from and drop it on top of the shot you want to paste them on, as shown in the above two shots.
Step Three:
Move the wheels into the proper location. If enlargement of the wheels is desired, free tranform them and move them into the correct position as shown in the shot above.
Step Five:
Since the whole purpose of cutting and pasting wheels is so that you can have perfectly blurred wheels with a prefectly crips car, you are probably going to want to blur the background as well, so here is a breif explanation of how I do it.
Make a selection around the car. Get as close to the edge as possible. Zoom in to 700% if you have to. Don't forget to cut out the windows if you can see the background in them. Be careful not to lose any reflectoins in the glass if you do. It should like the picture I have shown above.
Step Six:
Next you will want to duplicate the base layer, and using your selection you just created, copy the car and paste it on a new layer. Than duplicate the base layer once more and using the same selection you used for the car, delete the car out of the layer. Than duplicate the layer several times as shown above.
Than you will want to motion blur the background one layer at a time, using the layers you cut the car out of. Start with the layer top layer and make it the most blurred. Progress down to the last layer with the car cut out of it, decreasing the amount of blur by 10-15 pixels each time, until you have blurred all of the layers. This makes the blurring completely seamless without any trace of clear background around the car.
Than, make a few levels adjustments and your pic should look like this one below.