My goal has been to enter the proxy races and have been working to improve my cars.  I recently built two cars that ran sub 3.0.(2.997, 2,994).  I found the cars held that speed for about 2-3 weeks then times began to fall off.  When I re-prepped the wheels and axels, I was never able to get the time back under 3.0.  3.015 seems to be the new norm.  I noticed that the DFW had worn a groove in the body.  Is the a way to prevent this when bushing and spacers are not allowed?  Or is it just typical for cars to become slower with use?
				
			 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		