Upgrading brushless system
 

I want to upgrade my truck to an "overbuilt" brushless system, because my truck will be very heavy. I'm looking for something like a high turned xl motor, and a better brushless controller (rated for more amps).
I'm also looking for a lipo battery system (this is where the truck gets heavy). I run a pretty large BPP chassis, so I think I fit in quite a bit of lipo. Call me crazy, but I want 22.2 volt (18.5 nimh cell equivelent), 20,000 mah power system. I do indeed have the money to dish this out, so be creative:p .

I don't want to pull alot of amps, so maybe an 11xl motor and a 12020 esc?

If I find a system that works out for me, I will be having a Feigao 8xl (run very little), a 9920 (new, never even programmed), 2 pairs of fusion 8 cell straight line gp3300batteries (1 pair is a 1.75 volt spend $180 on it, and the other pair was 120). PM me if interested. Or give me an estimate of how much I can get out of all this on ebay.

Here is my truck so you can get an idea of its weight, and configuration (esc hasn't been mounted):

http://img.photobucket.com/albums/v7...c/IMG_0732.jpg

If you want all this power and such. I would say a 3695 controller. Run a 12 xl wander on 8s lipo. Have great power speed and run time.

Thank you.

I was looking at www.finedesignrc.com at lipos, but where will i find the 8s batteries? How many Mah will the 8 cells give me? Also, why would i need a 36 cell controller for a voltage rated at the power of 19 cells?

You painted your topedo chassis black? looks killer! Any certain paint?

no special paint, but thank you! Coolhand, ygpm

i wouldnt go with a 8s packs. i would go with 2 4s packs in series. max amps could possible make you some custom packs or you could check out tanic, thunderpower, or fma.

squee has the idea. You can get most charger for a 4 s pack to. Mah is not everything. With a 12 xl you won't need but 8000 mah to run a long time. 2 x 4s packs would be above the 9920 or 12020 capacity. 8 x 3.7v= 29.6 volts the 12 xl is not amp hungery motor. I ran a 9xl on 7020 esc. With this set up you probably looking at an hour play time.

Yup, checked out maxamps. Great site.

I run for hours on end the more mah, the merrier! Thats why I have have such a beefed up drive train for my new truck (UM trans in alloy case, titanium front center cvd, rc alloy rear center cvd, Sm f/r cvds, sm 8 spy diffs).

Okay, i found the general are of batteries i desire. I want the total # of cells (not just per side) to be 6s4p or the maxamps 4000 cells. Thats 22.2 volts total, and 16000 mah total, I can shell out for $400.

So i'll end up buying the 3s 4000mah pack, then ask for a custom 1s4p pack. I'll put the 3s on the motor side, and the 1s4p on the opposite side of the motor. What charger will I use to charge these two different packs?

Who else runs lipo?

So will a 12xl and 12020 work for this amount of batteries?

Thanks again guys

how would you get 6s out of 1s and 3s?

ugg. 4s pack, then a 2s4p.

scratch that....

A 5s pack, then a 1s4p pack.

Didn't catch my arithmatic. Thanks

What charger can I use for these two packs?

if you have the cash i would go with the schulze 330d. it can charger at a high amperage, 11s lipo, and 36 nimh i think...

where will I find that?

mike might be able to get if but if not here ya go... http://www.modelflight.com.au/schulz...y_chargers.htm

Thank you.

Now I just need to decide what motor and esc to get.


If anyone is interested I might sell:

Feigao 8xl motor (has 3.5mm female gold connectors soldered on): $80

9920 esc (has 3.5mm female gold connectors on motor wires, 4mm female on battery): $185

Fusion pair of 8 cell gp3300. Matched at 1.75 volts. Deans plugs installed $135

Fusion pair of 8 cell zapped gp3300. 4mm female plugs installed $90

1.75v sub-c cells? :eek:

You mean 1.175v?

you know how theres like 6s lipo and 8s lipo and 11s lipo etc isnt the higher the number the more powerful the batteries? like 12s is more powerful than 6s. If so then why dont you get 12s lipo and one of those bigger powerful motors with a good controller? I'm not a lipo guy so go easy on me if im wrong :) lol

weight is the main reason. also, if you make 12s packs out of 4000mah cells and get 12000 mah like he wants that would be 36 cells!

A pair of 4s1p in series of decent mah with an efficient motor,can give you 25 mins of runtime.Are you sure you want such long runtimes?Personally i would get bored driving for hours at a time.Also if it's not for long races i wouldn't run any packs in parallel,just get an extra pair of packs(same cost) and change batteries if you want to stay out longer.It'd mean less weight hence less amps, less heat, longer runtimes.Also less breakages due to lower inertia and better handling.

I wouldn't go with a wanderer XL for these kind of runtimes unless you keep the rpms way down(30,000 ish),unless you want to stop to let everything cool down frequently.A Lehner 1950,2240 or 2250 should run cooler for longer.

If you have the money i'd suggest a 1950/10 or 11 turn with a 3695 or 36120 on a pair of 4s1p packs in series and an extra pair of packs(not on the truck ie no cells in parallel) if you want the extra runtime.The higher efficiency of the 8s compared to 6s4p will keep you running cooler for longer and with more power to boot,since you'll be running a big low kv motor.

two 4s1p packs wired in series would give me 8s2p right? If so, 29 volts is a little too much. This is b/c the 36 cell controller cost too much. I would be looking for two 3s2p packs wired in series to make 6s4p. I don't want too high of a voltage. I'm calling Maxamps this morning to see what batts I should get, then i'll look for motors.

Maybe a 6s2p? But i'll check w/maxamps

Okay, my final battery selection w/ the help of the maxamps crew. I will be ordering 2 3s2p packs, which give a combined total of 6s2p.

So i'll be running 22.2 volts and 8000mah.

22.2/1.2=18.5

So I'll need a controller rated for 19 cells.
And a high turned motor.

RC monster doesn't have a 12xl in the wanderer series, unless you have one mike.

Mike, what motor and esc do you have that would work for this application? Thank you.

the 9920 and any right KV wanderer would do..

Mike can get you any wanderer you want.

A pair of 4s1p in series would give you 8s1p,8 cells in series.
If you want a significant increase in power over your existing setup i'd suggest going 8s or 7s,also for the increased efficiency over 6s.You can always adjust the EPA on your radio.

A pack change half way through the run will mean your not lugging unnecessary weight around,since paralleling isn't necessary for your amp draw.If we were talking about a 5 or 6 turn high amp motor that's gonna drain your packs in seconds and pull nearly 200 amp peaks then sure paralelling is the way to go.

If you're wanting 6s i'd buy 4 3s1p instead of 2 3s2p and go for a pack change,much better to carry them in your pocket than on the truck.

I'm just a basher, not concerned much with weight. Especially since i'll be using a high turn xl motor.

SO:

I'll Keep the 9920
Use a wanderer 12xl
2 3s2p lipo packs
5mm gold connectors everywhere


The goal of this system is to run cool, run as little amps as possible (to ensure longetivity), get about 30-45 mph, 30-45 minutes of runtime, have massive power, and put the lowest strain possible on the 9920 esc.

I am going to get an 11XL on 20 cells for my savage! with the 2speed and the mechanical brake, i doubt if it will work a sweat.

So a 12xl on 19 cells will be perfect then.

Yeah! no that much difference between the 11 and the 12XL..

Okay, so now all that stuff previously listed is for sale. It will go on ebay in a couple of days.


Fusion pair of 8 cell gp3300. Matched at 1.75 volts. Deans plugs installed $135

Fusion pair of 8 cell zapped gp3300. 4mm female plugs installed $90

Feigao 8xl motor (has 3.5mm female gold connectors soldered on): $80

better keep those 1.75 V cells.. :)

you know what i mean! 1.175!!!

Running 2 3s2p still makes no sense when you can run 2 3s1p and stop to change batts,running twice the battery weight only puts more strain on your 9920, reduces efficiency,increases temps,reduces performance and runtime.Also since 'bashers' need to be durable then low weight is very important.I seriously doubt you'll be able to run for that long without stopping to let it cool down anyway,so you may aswell half your battery weight and increase your performance and runtime,then your not wasting alot of the packs energy carting around the extra load.

So what do you recommend? Just two 3s1p packs?

Well yeah,but it's 'cause i'm allergic to paralleling.If you bought 4 3s1p packs it would cost the same,you still have the same no. of cells but your only running half of them at a time so you should actually get longer runtimes by not using energy carrying the others around.Those 4000mah cells are 12c constant (i think) so that's 48amps constant which may be enough but i'd like to hear other's opinions on this.If it's not then there's a reason to paralel but even so i'd rather go to a higher discharge cell like the polyquest XP 3700 16C/flightpower 3700 20C.http://www.duralitebatteries.com/batteries-esilver.html
for the extra $15 per pack.

I'll also be selling two superbrain 959 chargers $65 for both.

I'm going to go with the 3s2p, rated at 96 amps, I think i'll need it.

10 xl on a 6s lipo sounds better than a 12 xl. But both would be a good motor. 12xl on 8s would rock.

I like the 12xl. This truck will be HEAVY. 2 reciever packs, one to power the RX, the other to power the esc fans. 2 3s2p packs equels the weigh of 15 NIMH cells (which isn't that bad), RCalloys rear center cvd, gpm tran case (HEAVY), UM Gears (also heavy), reciever and rx battery holders (off a tmaxx), 8spy diffs, ue steel cvds, integ knuckles. The rest is stock, but this thing will be heavy: 13 pound range.

why not one lipo reciever pack at 7.4 volts with a high mah? im not sure but i dont think it would hurt the servo.

i think 7.4 is pushing it...

i know some of the hitec servos are capable.

I'm talking mostly the reciever. But i'll be happy with 2 rx packs. I cannot believe i'm about to spend $500 on batts alone, then another $160 on a charger!

i take it your getting the schulze?