Lipos for Brushless
 

I am sure this has been asked several times ragarding other vehicles, sorry, but i need to ask for my application. I am running 2 t4's. One has the novak 5800, the other has the mgm80 and 6s motor. Is there a good lipo pack that i can use with both? if not, what would be the best pack to match up to the mgm/6s combo? and finally, where is the best place to get some lipos?
thanks

The best lipolys to get for the 6S are the kokams 3200's. i don't know what you are looking for in speed, but a 2S runs pretty quick allready. those kokams can deliver a 64A.

Agreed. The packsa mentioned will work well in either application.

The Kokam's are really the only cell you want to use in either, I think it has a built in cut off device? You need one either built in or inline to run lipo with the Novak safely. The 6s draws a lot of amps as well so don't cheap out on lipo's otherwise you risk damaging them. Word has it 2s lipo is about the same power as 7 nimh due to less voltage drop, less weight etc.

The Scorpion packs have the cutoff.

i am looking to get 60 out of my modified t4.(it has the 6s). i am currently getting 50 with an 8 cell pack of gp3300's.

3s Lipo or a taller gearing will get you to 60.

I have a Mtroniks plasma pro motor which is fairly similar to the 540 6s, on 8 cells with steep gearing it'll pull 60mph off easy enough, on 6 cells if you gear steep it'll just about hit 50mph in my TC3. In my T3 I've only ran brushless with Masher 2K tyres which slow it down a lot because the extra weight compared to normal size tyres, but on 8 cells its still game for 50mph wheelieing all the way there. But battery life takes quite a hit (not so much with 8 cells).

well i think i may try and get a 2s pack with the 20c discharge rate to try it out.

I dont know, but using lipolies with the novak setup is a bit risky.

As long as you get some sort of inline voltage cut off designed for 2s lipo it'll work fine.

i do plan on getting a cutoff. any expectations on speed for the mgm and 6s with a 2s pack and geared with a 31/104 ratio with road rage2 tires?
thanks

oh yeah, what about a polyquest 2s pack, any thoughts? some ppl recommend those also

anybody know? or have a guess?

Which one? (How many mAh?)

estimated speed with a kokam 2s 20c discharge 3200mah pack?
is polyquest a good pack
and a new question is do i need the voltage gaurd thing for charging and the one for low voltage cutoff for in the truck?
thanks

Speed depends upon the gearing.
Polyquest are good packs.
The charge guard thing isn't as necessary as the low voltage cutoff.

i was reading back through here and was wondering if anyone was running a 3s on the 6s motor? i am considering getting one from tower unless someone can recomend a cheaper place

i forgot to ask...is the 3s pack going to fry my 6s motor? if so, what is one that can take the power and will push my t4 to 60+ ?
thanks

The 3s will be quite a load on the Feigao 6s. Also, because of the high voltage, the amp draw will go up, so that will make the motor get hotter, and it would definately get the speed control hot. It would surely take your T4 to or past 60mph. Also, you would have to make sure that any Lipo batteries you get can handle the amp draw. I estimate that at full throttle (loaded), the motor will spin at around 63,000 RPM. That is considerably higher than the motor's rated limit of 50,000 RPM.

so that puts me back down to the 2s in order to keep from cooking the motor....my thing is i really want to push 60+
right now i am pulling 43 on 6 matched cells carrying a gps and running 31/115 gearing.

If you want to push your T4 to those speeds, the best thing to do is get a slower motor and then use more voltage. Then overgear it.

hope that you have a wide open space to run it as you will be going 88 feet a second. I am curious why the "need for speed" with a stadium truck?

a slower motor?? ok, well a 3s pack is as high as i want to go cuz i dont want to buy another new charger. so lets say i get a 3200 or 4000mah 3s pack. what is a motor that will handle that when hooked to the mgm80 (which by the way, i want to get the new computer programable one when its released)? like i said, i am getting 43 while carrying a gps, so that should put me really into the 45-46 range. i have a few more things to do to drop weight and to drop rotating mass, which should give me 1-2 more mph easy, so basically i am right around 48mph on 31/115 gearing. i really want to stay around that ratio and still be able to push up over 60. so with that i ask, what motor would handle a 3s pack and get me to 60?
thanks

The lehner Basic 4200 will do the job.. Or an XL4200, that would be pushing your truck thru the sound barrier.. The basic 4200 would be a nice alternative, longer runtime, milder on your drivetrain and it will get a better lifespan from your lipoly's..

The Kokams/FMA's from towers are about the cheapest available

Let me tell you; a 60 mph rc car is nice to tell colegues and friends, but it's not too nice to drive it constant.. (rather stressing) and you need much space to drive it. You could always get a 6 or 7 pack of normal nimh's to drive it around at a more relaxing speed, but still fast.. My statement is 'better have the power than need the power..'

well, my stadium truck is extremely highly modified. i have many custom designed and made parts on it and this one has been redesigned to be street use only. its slammed to the ground with custom designed cf shock towers and soon a custom drop kit so i can puarms back to being level. the steeringis custom and about to be redesigned to be even more custom, more adjustable, lighter, and quicker. this is already an extreme truck and i want to pull some extreme speeds.
i do have about 6 really nice matched and zapped 6cell packs that push the truck to about 45-46 ( gps says 43, but that includes the weight of gps). i just want to get something that I can pop in and do a killer speed run.
so i can go 2s and should get near 55 with the 6s motor or i can go for the 3s and a new lehner 4200 and get 60ish.
is there something that would be faster than the 4200 on a 3s pack?
thanks

Ya, a 5300 on a 3s pack would be faster. That would be ~55,000RPM, which the motor is rated to handle. But that would be for speed runs.

The new Lehner Wanderer motors are nice as well..

My guess is you won't be dissapointed with an XL 4200 (it is a killer on 3S) the 4200 allready is fast though.. (and light) the XL 3600 can push an emaxx around at very high speed

what about the lehner 2100?

That would be good for 6s Lipo. 3s Lipo really wouldn't be enough.

alright, so if i sell my pimped out tc3, then i will either be going with the 2s and current system or the 3s and either the 4200 or 5300....
thanks

had to come back with this thread and see if i needed the low voltage cutoff for a 2s lipo pack on the mgm80?
thanks

The MGM controllers have an adjustable cutoff that can be programmed on the controller itself. No need for a seperate device with these controllers!

you know, that would prolly be great if mine would program at all. I am utterly dis-satisfied with my results on the mgm, i guess i must be too dumb to progam it (will explain in a second), what do you have that will handle like a lehner 5300, is programable via computer (or simple like novak), and doesnt need a reciever pack???
now with the mgm80 programming....
i do just what it says to get into programming mode:
turn on radio hold FT, then turn on controller
after `10 secs, it beep 3x, then go FB for 1 beep, then neutral and 1 beep

when i go back to neutral, i get 2 beeps, so i dont know where i am or what it is doing.
normally not such a big deal, it runs, but with issues with it braking and backing up on its own and then i now have the 2s pack i want to run....i need some major help in figuring out what is going on, or what i can replace this pos with.
i will appreciate any help from anyone on this issue....also if anyone could use a SLIGHTLY used mgm80 and 6s motor....

When is a good time(early evenings hopefully) to call you? PM me your number and a time range and I will give a call to help you through the programming. I struggled with it for a while myself!

The backing up on itself is really a nuetral position error. If you could possibly reprogram it or adjust the trims on your radio, it should all straighten out. Mine runs flawlessly.

The Mtroniks genesis controllers meet your requirements but nowhere in the US stocks them so you have to order directly from Mtroniks in England.

My MGM 12012 controllers also beep 2 times when going back to neutral. I just figured it was a typo in the manual and decided to go through with the programming anyway. Every change I've tried in the programming seems to work.
Essentially, what I do is turn it on holding full throttle on the radio, wait for it to beep, push full brake, wait for it to beep, put the radio in neutral, wait for it to beep. I've pretty much started to ignore how many times it's beeping, as long as it IS beeping during programming. Once I'm into the programming mode, I press full brake once to set car mode, then full throttle to save the setting and move to the next.
The last test I have to perform with the controller will hopefully happen tonight. I will use my ICE charger to discharge my 2s lipo to about 6.3 volts, then attach it to the MGM and run it to see if it cuts out at 6 while programmed for 2s.

Lastly, when I was programming an MGM 12012 for my Jato, I had a problem with needing the throttle on the radio to be in reverse due to the brake servo. I couldn't program the radio in reverse, and when I programmed it in normal, it would not work once I put it in reverse. I ended up trying other servos I had laying around until I found one that worked correctly in normal on my radio. Make sure you're not programming in normal and switching to reverse for actual operation.

let me know how everything works out with the ICE, i have an ice also and once i get my mgm setup for lipo, i will be using it to charge a 2s pack also.

Batfish - I have an even better idea. You know how the ICE can do motor run-in? Plug the ICE output wires into the MGM's input wires. Go to the motor run-in option on the charger. Set it for about 7v. Turn the MGM controller on, and set the throttle trim so that there is low forward throttle. The motor will spin, because the ICE is supplying it with power. Now, on the ICE, you can adjust the voltage while the motor is spinning. Take it down to 6v, and see what happens. Bring the voltage lower until the MGM cuts out, and the motor stops spinning. This is an excellent test, and is more precise, and you don't want to risk your Lipo.

That's actually a pretty good idea and I may try it. I do, however, have an E-Flite power meter, which I put in-line with the battery and ESC, so i can monitor voltage live. It takes readings 3 times per second, so I'm sure I'll be okay monitoring it that way. I just planned on using the ICE to discharge the lipo at 10A and set the cutoff voltage at 3.2v per cell so it will stop and let me move the pack to the vehicle (with the meter) for final bench testing.
I've already tested the voltage cutoff using my nimh packs, and it performed as it was supposed to. Now it's time to prove it with the lipo packs directly.

Sleepy32 - I use my ICE to charge my FMA/Kokam 3s 3200 packs and it works perfectly. For the BalancePro packs, I use FMA's specific BalancePro charger.