Brushless Savage Setup

Hello folks

I am new here. Dafni told me about this great forum yesterday. As I am converting my Savage 25 RTR to Brushless I read a lot of threads here and in other (german) forums. (BTW: excuse my poor english...)

I already placed an order for a Wanderer 20XL/9 and a Warrior 12020 at BK, but I can still switch the setup as I have to wait for some parts.
After speaking with different people in Switzerland and Germany I was surprised that the 7XL is the choise of many drivers in this forum. One thing that nobody discuss here is the problem of hopups that have to be made while using a motor with so much torque... In Germany everybody tells you first about the stronger dogbones, cup joint, diffs etc. you need. Are you driving the 7XL with stock parts?? The only thing I modified is a 4-spider diff. The drive train is still stock.

Before I ask the question that everybody asks, here is my (virtual-)setup:

- BK Wanderer 20XL/9 (kv: 1667)
- BK Warrior 12020
- 16 cells GP3300 (given as I already own this)
- fixed gear
- 16/49 or 18/49

I like to build a car that is not a material-killer(!) and I drive mainly in the gravel-pit (climbing & jumping), so speed is not the one and only. I used the savage speedtable to make some calculations and I learned a lot about the sweet spot and heat regulation from Dafni. Now I think that the setup above could be optimized for my needs.

With 16 cells (calculated with 1.15 volt) I get about 30'000 rpm which is clear below the sweet spot of 35-40'000 rpm. And the speed is also poor: 24mph with 16/49 or 27mph with 18/49 translation in first gear. What can and should be changed???

a) 20XL/8 (kv:1875 -> 34500 rpm) = 27mph (16/49) / 30mph (18/49)
b) 20XL/7 (kv:2145 -> 39500 rpm) = 30mph (16/49) / 34mph (18/49)
c) 20XL/7 and fixed second gear = 38mph (14/49) / 44mph (16/49)

Is it possible to drive the c-setup (second gear)? Or does it generate to much stress to motor and drive train?
To hit the brushless sweet spot under "normal" gravel-pit condition I think the 20XL/7 is the best choice.

What do you recommend? What's the golden setup?
Serum, Mike what do you think?

-- Dave


Remember: I don't want a beast that kills all the drive train parts (the Savage will be about 15 pounds).