Kraton Should I go with 39/39?

[Spikey]

Hi guys, just finished built the arrma kraton EXB
Specs are
Hobbywing max 5 esc
Hobbywing 800kv motor
Savox SW0241MG servo
39t spur gear
30t pinion
Should I go with the 39t pinion?, I already have.

I'm using two hoovoo 4s 5500 120c batteries
I'm not getting much run time on those, probably 15 mins, may have to go a higher mah battery.

Also I realized the servo is not turning the wheels on the ground, only when the truck is driving, I set the Bec to 7.4, didn't make much of a difference, should I add a glitch buster? Or just get more powerful servo?

 

[Raginbull74]

I have the same servo...it's eh at low speeds, but it can be damn squirlly at speeds over rough terrain...I have no issues with it. Imo, a super quick servo in these 30lb trucks aren't really needed if youre general bashing. If you're running on a track with tight hairpins that's another story.

 

[a2lowvw]

800kv on 1:1 ratio is lots of fun. I would look for a better servo, that savox is underpowered for the 8S lineup.

 

[Spikey]

800kv on 1:1 ratio is lots of fun. I would look for a better servo, that savox is underpowered for the 8S lineup.

What do you suggest?

 

[a2lowvw]

I run the Spektrum S9120BL and have had really good luck with it. About 1/2 of our bashing group run them and haven't seen one with an issue yet. I know a couple guys were using some less expensive anodized blue ones that had trucks down while they were waiting for warranty replacements.