Does anyone know what is the fastest time on a sedan cause I want to know

 

you might want to rephrase your question so we can actually know what you are asking about? Fastest time compared to who? what? Fastest time where? On the track? 1/4 mile or 1/8 miles?

 

With drag radials my car is mid-low 12's with the system. I would bet $100 there are many coupes that are in the 11's.

 

Is it just a matter of fitting more tire under their rear end? We are lighter and all else is similar...

also do you use a lot smaller(diameter not width) wheel with your drag radials?

 

No it's lack of power. My car is still on the stock block so I can only get ~450whp out of it before things go bad. With more power and a better driver a sedan can make 11's no problem, maybe even 10's. I know there are some Z's in the 10's. That's more money than I am willing to dump into my car since I never go to the drags.