i want to make it better

I know very little about the actual making of these kind of sigs (grunge, abstract, the name changes every few months) but I think I've seen enough to give you some pointers. The red in the "R" is very distracting to me personally so I would change it to a different color, as is the transparancy of the text.

 

 

 

 

 

 

 

Aside from personal preference though is that the blending appears somewhat unfinished and sloppy to me. Take the render for example. There's a definate difference between the front and the back of the car and it happens just about at the door panel. The white of the car is too white for the rest of the sig and there are blotchy red bits on the car. Additionally the render sticks out too much from the BG and it's easy for the eye to pick it out. Try brushing the border between the car and the BG to make it blend more along the edges while still appearing to pop out near the center.