1512 1d on 4s 2170 mah? I think you seriously need to reconsider you setup or else something may blow up. The motor is really a 3s motor since its not a good idea to run it past its rpm limit, and there is no way the 2000 mah batteries will support the required current unless they are rated for 60c continuous.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy