Rustler 8s/9918: gearing/cells?

[Rtsbasic]

Sounds like your undergeared. 10 cells on the 8s should in theory fly. I run 8 cells on my 6s and it'll fly faster than any of the speeds you've posted with the right gearing. Your setup should rev the same as mine on 10 cells, but have more torque.

I have no experience with the rustler, but in theory, you need to run 25/84 (assuming normal 3.5" diamater tyres, adjust accordingly if your tyre sizes are different) giving a ratio of 9.14 and approx 55mph.