Picking the right motor for the right application

[VintageMA]

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OK - this is a very confusing topic for me because there seems to be little out there for reference short of reading through the experiences of what motor people have selected for there car and trying to approximate that motor based on the weight/style of your application.

My question is this - how do you pick the right motor for your car? It seems much easier to pick and ESC. But for the motors there are so many different variations out there. You have only a few primary variables that need to be taken into consideration in my mind:
1) weight of the car
2) top end speed versus acceleration
3) # of cells being used / current draw
4) heat dissipation

With that in mind, none of the motor specs really translates into the variables shown above directly.

In my first noob conversion I have converted an Kyosho MP 7.5 to brushless and used a Nemesis 7XL motor. The thing doesn't cog at all, the acceleration is mind blowing, and I get about 10 - 15 minutes off of a 4S 3700 mAh lipo pack. Top speed with 14/46 gearing is easily in the area of 40mph. Using a Warrior 9920 ESC. Temp wise, at the end of the run the motor is around 130 on the can and 150-160 at the endbell, the ESC never goes over about 100.

My next conversion is going to be my LST2 because nitro has just begun to piss me off (granted I still like the sounds and smoke). I have guestimated that I will do well with a LMT 1950/7 motor (stock gearing) with 6S 8000 mAh and the MGM Compro 160 amp, 24 cell ESC. Based on what I have read others do, this seems to be about right.

But I'm still uncertain, how do I know a 1930 or a 1940 with higher winds wouldn't be enough? Or is LMT 2200 series really needed for that much weight?:026: :026: :020:

It's very confusing - they tell you what the motor winds are, the max current is, the RPM/v, the max RPMS, and the max power in Watts. But if you compare a 1930 with high winds to a 1950 with low winds the RPM/v and max rpms are the same, so that would leave me to believe that I could use the same # of cells to get the same speed, but how will I know if I am going to draw to many Amps with the 1930 and kill it versus going with the 1950 which will weigh more?

Aaaarrgh..... Thoughts? Please let me know if there is something I am missing here.

Thx