Hyper 8.5 pro build

[tc3_racer_001]

quick little update:

one of the a123 batteries refuses to charge up past 3.37 while the other cell charges properly to 3.7v... charger bleeds off voltage until i gave up after 3 or so hours...
weird thing is, it has no less voltage drop or performance than the other pack when tested with the Watt meter in my touring car (which is now broken!)

well it works! thanks to all who helped, much appreciated.

but: i borrowed my friends Mamba Max (originally mine in my e-savage, sold it as a package, thinking id get a monster max 4 months ago ) and it ran great.

but its SLOW :(

only 47.2km/hr on a flat road with a 16t pinion...

SO

im going to sell the a123 batteries (as ive decided id like to try racing and i cant fit the batteries properly, as they just dont fit with the shell on ANYWHERE....


and with the money i get (used 3 or so times since new, should get close to $100)

buy a zippy lipoly, as ive read nothing bad and just cannot afford to buy a neu (id rather buy one now, use it, it die in 4 or so months and buy again, than save for 4 months and buy a neu and risk ruining it...)

also destroyed the esc in my touring car (go figure), one of the caps on the top just went poof just turning it on, when id used it for 1/2 an hr and just checked the temps (which were 5 or so above ambient! GRR)

o well, thats life :)

BUT

ive got a quick decision. should i go with 4s and the 1512 2D with the 16t pinion, or should i get a 5s and gear down to a 13t (or so) pinion? (i have 13, 14 and 16). which setup would run the coolest? (would the reduced current draw of the 5s pack outweigh the increased motor temps from spinning faster!) (4s=37700K 5s= 45900K rpm unloaded)
pack 1:

3 month warrenty, which is great, good 25C -35C rating... if that means anything with these,
4000mah (150x50x37, 581g)

OR

Pack 2:

4800mah, 25(minimum?)-35C, 170x43x45mm, 636g

now, i need to do 15-20 minute mains without thermalling or damaging anything... is this at ALL? realistic with either of these packs.

also the 2nd one is $1 cheaper and is exactly the same dimensions as the new polyquest packs so im thinking these are either reject cells which are still good or excess with some other problem. i can live without spectaular performance, just something that works and keeps on working :)

also they are heavy, and the question is, will they fit well under the cover?

thanks guys. also, would the motor overheat without any cooling? (covered front/end + no holes in body) seemed to run cool (got a temp gun on the way, finally...) for the 10 minutes i had it going, (would start to burn your hand after 15 secs of holding it on the 14t pinion on dirt doing spins and stop start etc, trying to get it as hot as i could :)

thanks again guys,
ryan

[tc3_racer_001]

well finally the day has come when its alive and working...







custom battery tray and acrylic top protector. still have to cover over those nucience nitro related holes! any tips??

hit the track and i need to learn to drive haha.

stripped the plastic servo horn which is an easy fix, only put 1300mah into the pack after 10 mins of use - was afraid of using to much HAHA> next time ill go for 15-20 minutes - cutoff i set at 3.3v/cell. the zippy is .1v out of balance at most. 110+ amp spikes with 1200W peaks!! WOW> impressive :)

very happy with it. and my esc is still working...