[jhautz]

Yes. Ive run quite a few Neu motors in all kinds of vehicals. No I havent done any 1/5th scales becasuse I never wanted to invest to kind of money it would take to do one correctly. What you are planning will make it run, but you are likly to have all kinds of heat issues spinning a long motor that fast.

25lbs is a heavy beast of a car even for just running on pavement.

I would recomend picking a larger diameter motor with alot of torque, lower kv say 1000 and run it on the 8s you were planning. Then for speed use the gearing. Spinning the motor faster isnt the only way to get more speed.