What tires and spur are you using. With the stock tires I was running a 22/62. I am running badlands now and running 20/56. Oh thats on 4s lipo.

hi i plane on using crime fighter or bow-tire with 6cell lipo

Man you dont like your tire do you? Seriouly though on 6s 20/62 is about 46mph. That would be a very effecient set up. If you need more speed(if your racing you shouldnt but) put on a 58 tooth spur and it goes up to around 50mph.