Results 1 to 15 of 15

Thread: Newby

  1. #1
    RC poster
    Join Date
    Jan 2012
    Posts
    7

    Newby

    Tomorrow I will have my e-revo brushless, I currently have a rustler vxl which I love. I'm getting a 24/54 gearring running two 3s lipos in my revo. I guess my question is what should I be looking out for and do I needto buy a new set of tires and rims right now? I'm hearing that the factorys won't last very long with that gearing and those batteries. And what tires, what rims? I need street and off road. Please advise, signed The man who can't wait till tomorrow. lol

  2. #2
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    get a temp gun, for running that gearing & batts... & castle link for programing.. set the LVC to 3.4..
    that gearing is for smooth throttle control & a smooth flat surface

    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F maximum, ideally 140/160*F, temps can be 10* higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F
    Lipo's ~ 140*F max, ideally 100/120*F


    some more good info..


    AOD's Links Revo

    Erevo 101:
    EREVO FAQ

    Lipo, LVC, Brushless & Battery charger/charging guides & purchasing links:
    TUTORIALS

    Refer to this to setup the Mamba Monster ( MMM ) esc for maximum performance:
    CASTLE LINK GUIDE
    or
    http://traxxas.com/forums/showthread...stleLink-Guide

    Refer to this to find parts, upgrades, batts & chargers etc:
    USEFUL LINKS


    And direct from CastleCreations ( the esc manufacturers ):
    MMM FAQ

    Driver's ED Manual

    LED warning light meanings
    Last edited by 87 GN; 03-08-2012 at 08:38 PM.
    Would you go flip my truck back over??

  3. #3
    RC poster
    Join Date
    Jan 2012
    Posts
    7
    thank you so much, lots of info. I will start with that temp gun. got some work to do.

  4. #4
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    sorry forgot tires..Badlands........taped............. more pic at the end of the thread.
    http://traxxas.com/forums/showthread...=1#post4908845
    Would you go flip my truck back over??

  5. #5
    RC Competitor
    Join Date
    Jan 2012
    Posts
    75
    Why set LVC to 3.4?

    I always thought 3.75 was a good Amount?

    I had these notes made:

    Lipo: Fully charged is 4.2 volts.*
    100% charged 3s pack = 12.6v

    Never discharge below 3.7v x3 *=11.1
    3s pack discharge to 80% *(3.75v) is 11.25v
    All cells balanced .01-.03 of eachother*
    2s = 2 3.7v cells in series = 7.4v
    3s = 3 3.7v cells in series =11.1v

  6. #6
    RC Competitor
    Join Date
    Feb 2012
    Posts
    79
    Yo 87 GN what's up, I'm also just getting my brushless revo and am new to the threads. I've had an older e Maxx for years and I'm ready to step up to the big power. Lots to learn about lipo's and charges. Ive been reading the past few night and you have some good advice for sure. I'm interested in most of the links you put on the top of this page but I can only get two of them to open. The rest say the page has been removed?? Is it on my end ? The castles and traxxas will open but the rest don't. Also is there a way to bookmark a thread so I can go back and look at a later date and not have to go through endless pages or search for it.thanks for all your posts they are very helpful and a great source of learning.

  7. #7
    RC Champion
    Join Date
    Apr 2007
    Location
    Valrico, FL
    Posts
    1,679
    Quote Originally Posted by olliewog View Post
    Why set LVC to 3.4?

    I always thought 3.75 was a good Amount?

    I had these notes made:

    Lipo: Fully charged is 4.2 volts.*
    100% charged 3s pack = 12.6v

    Never discharge below 3.7v x3 *=11.1
    3s pack discharge to 80% *(3.75v) is 11.25v
    All cells balanced .01-.03 of eachother*
    2s = 2 3.7v cells in series = 7.4v
    3s = 3 3.7v cells in series =11.1v
    3.75 is fine but will cut out a noticeable amount of runtime......3.2 is the rule of thumb but i set my lvc to 3.4 volts as well to give me a little more cushion in case a cell discharges faster than the others for some reason.
    -ERBE
    -Slash 4x4

  8. #8
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    AOD site is down again..

    LiPo battery cells are rated at 3.7 volts per cell

    •3.7 volt battery = 1 cell x 3.7 volts (1S)
    •7.4 volt battery = 2 cells x 3.7 volts (2S)
    •11.1 volt battery = 3 cells x 3.7 volts (3S)
    •14.8 volt battery = 4 cells x 3.7 volts (4S)
    •18.5 volt battery = 5 cells x 3.7 volts (5S)
    •22.2 volt battery = 6 cells x 3.7 volts (6S)
    •29.6 volt battery = 8 cells x 3.7 volts (8S)
    •37.0 volt battery = 10 cells x 3.7 volts (10S)
    •44.4 volt battery = 12 cells x 3.7 volts (12S)

    the MMM has a max of 22.2v
    or 6S

    I don't use the 80% rule, I just go off the 3.4v per cell cut out.
    my LVC is 3.5v per cell difference in a few min.. I time my runs, so I never hit the LVC anymore.

    Below 3.2 ~ 3.4 a pack will heat up fast, if you push it right down to, or even lower than 3.0 volts per cell under load. Even if you have a 40C pack and can only draw half that amount, if you push it hard right down to 3 volts per cell - it will become very warm/hot and will shorten its life substantially.
    Last edited by 87 GN; 03-08-2012 at 09:52 PM.
    Would you go flip my truck back over??

  9. #9
    RC Competitor
    Join Date
    Feb 2012
    Posts
    79
    You guys are getting into some deep stuff for a newby thread. Some of that stuff is like reading Japanese to me at the moment but I'm gonna keep reading and figure all this stuff out. 3.75~3.4 ? Are you guys referring to the charge rate? Sorry I sound so dumb but I've got to learn somehow.

  10. #10
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    charge rate is
    1C = 1 amp for every 1000 mAh
    2C = 2 amps for every 1000 mAh

    a fully charged battery is 4.20v
    store Lipo at 3.85v ish for any length of time
    cells are rated at 3.7 volts per cell
    3.4v = voltage you want your batts to be when when your run is done

    ============================================
    MY BATTS:
    2S 9000 x 28C = 252,000 divide 1000 = 252 amps
    2S 8000 x 28C = 224,000 divide 1000 = 224 amps
    3S 5200 x 40C = 208,000 divide 1000 = 208 amps
    2S 4700 x 25C = 117,500 divide 1000 = 117.5 amps
    I run in my Summit.. ^ Requires proper gearing^


    ( mah x c rating / 1000 = amps),

    The more amps the better / minimun of 120 amps.

    The ESC will only draw the amount of amps it needs.

    Higher the mAh the longer the runtime.
    For brushless systems 8000 mAh about 45 min & a 5000 mAh about 30 min.
    Times are longer for brushed systems.


    Batts in series double the voltage:
    2x 2s 20c 5000mah = 4s 20c 5000mah

    Batts in parallel double the mah capacity:
    2x 2s 20c 5000mah = 2s 20c 10,000mah.
    Would you go flip my truck back over??

  11. #11
    RC Competitor
    Join Date
    Feb 2012
    Posts
    79
    Thanks that clears some things up for me , I'm gonna read some of those links up top and I'll be back to ya with some more questions I'm sure .

  12. #12
    Marshal ksb51rl's Avatar
    Join Date
    Nov 2006
    Location
    Northern NJ
    Posts
    15,870
    I don't use the 80% rule, I just go off the 3.4v per cell cut out.

    You sure about that? I believe "3s pack discharge to 80% *(3.75v) is 11.25v" refers to resting voltage. With your LVC set at 3.4v/cell, you should be pretty close to 3.7v/c at rest.
    Alt-248 on the number pad =

  13. #13
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    humm never thought of it that way... I know the resting point is a couple .XXv above LVC..
    Would you go flip my truck back over??

  14. #14
    RC poster
    Join Date
    Jan 2012
    Posts
    7
    87 GN you know ur stuff, I was disappointed today, ERBE came in but it didnt have the TQI controller, so itnwas sentback and I'm now looking at a Wednesday pickup, just give me more time to research. but i was smh
    Last edited by bbigfella1914; 03-09-2012 at 05:17 PM.

  15. #15
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    Quote Originally Posted by bbigfella1914 View Post
    87 GN you know ur stuff, I was disappointed today, ERBE came in but it didnt have the TQI controller, so itnwas sentback and I'm now looking at a Wednesday pickup, just give me more time to research. but i was smh
    just enough to be dangerous....
    there are others here that know way more than myself...
    Would you go flip my truck back over??

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •