Originally Posted by WPNpipSTAR

It really depends on where you want to race and what you want to accomplish. The main heat killer in a motor/esc is gearing. You should have no problem running a 1900kv Tekin T8 on 4s geared 19/20-46.

When you consider all the things that people are telling you, remember this. The only Battery packs approved by ROAR (sanctioned racing) for 1/8th buggy are 4S hard case (roar approved sticker) packs. If you fill your pit bag up with 5-6S packs, that's fine. But never plan on racing in a ROAR event until they change this. 1700-2050kv is the moat common setup, 1900 being probably the most popular setup. 2650 is way too much for just about any track you won't use the top end. And the 1700 being more for smaller tracks. Quick throttle torque for tight corners immediately followed by jumps. 2650 would have more lag and less torque for the jumps.