what sort of run times...help

[rc_dan]

hi guys, what sort of run time will i get from a 3cell 2150mAh zippy pack in my madrat
with stock gearing and 8.5turn brushless setup

cheers guys

[stampede vxlboy]

it will take a 7.4v lipo my does wheelies and back flips . but with a 11.1v lipo you will kill the gearbox mate keep to 7.4v. trust me my mate got a madrat hes had to get 4 new diffs in 4 weeks with running 11.1v your battery should run for about 10/15 mins max get a smaller battery 7.4v and bigger mha there fast as hell for a buggy my motor 4700kv 8.5 turn and my batterys are 7.4v 3300 35c last for about 20/25mins if you bashing it to the max it wont last long . i got a 4900mha 25c well fat pack like the trackpower but not hardcase 11.1v forsale £47 plus postage cost me £110 from usa but not a hardcase battery last about 45mins/50mins in my rustler vxl

[rc_dan]

i will stick the my 7.4 then mate thanks for the advice, i have a few lipo's mate no need for another good look with the sale tho

[Si Coe]

Well I've never tried it with a Madrat but I once ran a B4 with an 1800Mah 3S pack and a 7.5t brushless. Ran for about 6mins.
But:
Stuttered badly under acceleration as a 30C 1800 is equivalent to just a 15C 3600, not nearly enough. So unless your 2150 is at least 35C I wouldn't bother.
The weight balance was screwed up. I needed to put a conventional sized Lipo in for ballast!
The motor was scorching after just 6 mins.
There wasn't nearly enough traction to make use of the extra speed. It had a higher top end than on 7.4, but took miles to get there.

Just stick with a normal sized 2S.

[stampede vxlboy]

what it for bashing i try my for 5 mins heat with 11.1 it was fast but and all over the place .but better with a 7.4v lipo there shit hot on a track . anybody got spare lipo going forsale