Newb guides?

[Cassp0nk]

Hi,

I've been having a search, but can't find any info on selecting the correct brushless motor + pinion for a car, and what factors impact this? Can anyone recommend a guide which explains all of this?

I'm considering getting the following setup just from looking at what people are running, but not sure what pinion would be appropriate and what the considerations are when deciding.

Cat SX
Losi xcelorin 6.5 ESC + motor
spectrum dx7r
team associated ds1015

Also not clear on how the batteries work from a few comments on here. I thought that the main difference between a lipo with 3400 vs 4900 say, would be runtime, but I've seen comments implying the 4900 would be faster?

Thanks for any help, I'm sure this stuff is all written up somewhere so if someone could point me at it that would be wonderful!

Dan