So I was thinking of getting an Cray xb8e what is a good motor esc combo under 300 and what other things would I need for it like a good radioand good tools for it

Tekin Gen2 RX8 with 1900 motor is under that price and by far the most popular setup. Works on any track.

+1. The Tekin combos are great. I'm pretty sure that Hobbywing make some 1/8 combos as well.

if you can afford it the tekin gen2 combo is the way to go with a 1900kv T8 or so (could be 1700kv on small tracks and 2050 on big ones)

another very good esc for 1/8 is the xerun 120A sct, but it lacks the 7,4v bec and some nice features (the software on the tekin is more advanced)

Ok thanks guys but what other supplies would I need like what tools and can you tell me of a decent waterproof servo and good radio and a good receiver cause this would be my first kit and I want to know everything good I want all my stuff waterproof I will be racing but not that much. I will mainly use it for bashing and stuff

Is there a good waterproof motor esc combo that I could use and which pinion gear should I get for these?

I'm kinda looking at the castle combo because it is waterproof but what is the difference between 1900kv and 3400kv I don't really understand this

The tekin 1900kv motor is great. The esc is made out of plastic and they seem to always have problems. Get the Viper vtx8 or for half the price, the Hobbywing 150a.

Are they waterproof and what battery do you guys reccomend

Well if you want waterproof I'd say buy a boat, these things aren't meant for running in water unless you are prepared to blow out and clean all bearings, and the entire car after doing so. I don't know of any full on "waterproof" electronics so someone else is gonna have to help you there, plus the motor and batteries, I'm sure there is a thread on it already.

kv is related to rpms

rpms = voltage x motor kv

voltage is 14,8v in 4s and you'll need about 30 000rpm so.. 30 000 / 14,8 = about 2000kv

in 3700kv your rpms would be way too high as well as the temps, just go for a motor between 1800 and 2000kv in 1/8

now for the waterproof aspect, I use silicone joint to protect my motor and plasti dip for my esc.. it works with any combo and you get water RESISTANT electronics, nothing is really waterproof in r/c cars (because of the bearings mainly)

now for the radio, this is the very most important item you'll need with a charegr so if there is one single part you don't want to spare money on, it's the radio.. very good brands are futaba, sanwa and kopropo.. if I began r/c I would take a Sanwa MT4S

tools: as important as the radio & charger.. get something durable: MIP Thorp, EDS,..

Here are the most important ones:
- 1,5mm, 2mm, 2,5mm and 3mm hex driver
- 5,5mm nut driver
- philips drivers
- 17mm wheel wrench
- pliers
- ...