They use aglow plug for starting, and are compression ignition, the smaller displacemnt, the higher the RPM, larger motors turn slower, but make more torque.
The T-Maxx is nice (Like the stacks

) We have a 3-speed transmission conversion kit laying around the house, haven't installed it yet.
These little nitro motors aren't the "cox" motors of the past,,, these things idle smooth, have good torque, and are dripping with HP.
I have a . 12 motor in an RC-10GT and it's rated for 1HP @ 15,000 RPM (or 25,000, can't recall at the moment) This thing flys, and handles okay.
I prefer 1/8th scale cars/trucks,, they handle MUCH better, but price goes way on up also.
My advice on your new T-Maxx,, get a on-board temperature gauge for engine temp,, they don't cost too much,, and can save a motor.
Cylinder temp is just as critical as EGT in our trucks. .
On the flip side,, running to cold/rich will wear a motor out in short time, and the motor will be much lower on performance. (lots of lag, low running time on a tank, lots of oil out the pipes, etc. )
Enjoy,,
BTW, The best servo's out there are Multiplex, but are WAYY Pricey, best value are JR servo's. Run a bigger battery pack for your servo's and GO DIGITAL,, it's the only way to go,, you will have shorter run times on batteries, but the driving experiance will be much different. The truck will stay straight, and response time will be greatly decreased,, if you are racing them, lap times can easily come down also.
Hope this helps,,