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  1. #1
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    Stampede doesn't reach factory speed 30 miles

    Hi,

    I have to find the failure why my Stampede 4x4 doesnt reach the 30 miles speed written in the Traxxas specifications.

    Specs:
    - TRX3350R Velineon VXL-3s Brushless 3500 Power System (Sport Mode)
    - 2S LiPo
    - 54T Spur Gear
    - 11T Pinion Gear
    - Pro-Line Badlands MX28

    It only reaches 21 miles.

    Do you have any idea why?

    Thanks in advance.

    Greets Sascha
    Last edited by TschaaaaaaaaaA; 03-25-2020 at 11:27 AM.

  2. #2
    RC Qualifier
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    Are you in 50% mode?

    Sent from my SM-N975U using Tapatalk

  3. #3
    RC Qualifier
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    Also your battery C rating will have some effect, and the badlands tires may slow you down a little.

    Sent from my SM-N975U using Tapatalk

  4. #4
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    Quote Originally Posted by Aqualungs View Post
    Are you in 50% mode?

    Sent from my SM-N975U using Tapatalk
    Nope already tested

  5. #5
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    Quote Originally Posted by Aqualungs View Post
    Also your battery C rating will have some effect, and the badlands tires may slow you down a little.

    Sent from my SM-N975U using Tapatalk
    The lipo has 80C so that shouldn't be the problem...

  6. #6
    RC Champion zedorda's Avatar
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    The max speed possible without going down hill with that setup is about 25 mph. Was there not a "speed pinion" that came with the Stampede? Because a 13T pinion will get you a max of about 33 mph.

    The 80C rating on your batteries is marketing. Please don't believe it because it is at the least a complete lie.

    Companies rely on customer ignorance of battery chemistry. Because in reality a 80C 2S battery would cost upwards of $500+. Anything rated over 50C should be highly scrutinized before believing. I have yet to have even one of my non-SMC batteries actually perform at the C rating they were labeled over 30C. And that is of a lot of 34 batteries. I own 2 SMC batteries.

    Online tool to calculate possible results.
    https://scriptasylum.com/rc_speed/top_speed.html
    Last edited by zedorda; 03-25-2020 at 02:09 PM.

  7. #7
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    Quote Originally Posted by zedorda View Post
    The max speed possible without going down hill with that setup is about 25 mph. Was there not a "speed pinion" that came with the Stampede? Because a 13T pinion will get you a max of about 33 mph.

    The 80C rating on your batteries is marketing. Please don't believe it because it is at the least a complete lie.

    Companies rely on customer ignorance of battery chemistry. Because in reality a 80C 2S battery would cost upwards of $500+. Anything rated over 50C should be highly scrutinized before believing. I have yet to have even one of my non-SMC batteries actually perform at the C rating they were labeled over 30C. And that is of a lot of 34 batteries. I own 2 SMC batteries.

    Online tool to calculate possible results.
    https://scriptasylum.com/rc_speed/top_speed.html
    Great link thanks!! Yes I know that the 80C are not realistic ^^

  8. #8
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    Quote Originally Posted by zedorda View Post
    The max speed possible without going down hill with that setup is about 25 mph. Was there not a "speed pinion" that came with the Stampede? Because a 13T pinion will get you a max of about 33 mph.

    The 80C rating on your batteries is marketing. Please don't believe it because it is at the least a complete lie.

    Companies rely on customer ignorance of battery chemistry. Because in reality a 80C 2S battery would cost upwards of $500+. Anything rated over 50C should be highly scrutinized before believing. I have yet to have even one of my non-SMC batteries actually perform at the C rating they were labeled over 30C. And that is of a lot of 34 batteries. I own 2 SMC batteries.

    Online tool to calculate possible results.
    https://scriptasylum.com/rc_speed/top_speed.html
    Nope I dont have the "VXL" version.
    I upgraded my brushed stampede 4x4 with the velineon combi and exchanged to 11T pinion gear.

  9. #9
    RC Competitor
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    Oct 2018
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    The brushed version has a lower ratio in the diffs then the vxl.

    Sent from my SM-G970U using Tapatalk

  10. #10
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    Quote Originally Posted by Steve g View Post
    The brushed version has a lower ratio in the diffs then the vxl.

    Sent from my SM-G970U using Tapatalk
    Oh yes you are right....

    Front dif:
    Brushed Stampede: TRX6778
    VXL: TRX5379X or TRX5379R

    Rear dif:
    Brushed Stampede: TRX6779
    VXL: TRX6879 or TRX6879R

    The rest of the dif is the same!!

    I guess I have to put on a bigger pinion gear or a smaller main gear to even out the difference.

    Great tip thank you! I guess thats the root cause!

  11. #11
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    Quote Originally Posted by Steve g View Post
    The brushed version has a lower ratio in the diffs then the vxl.

    Sent from my SM-G970U using Tapatalk
    To achieve the stock VXL I can change the main gear and pinion gear according to the table:

  12. #12
    RC Racer
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    Quote Originally Posted by TschaaaaaaaaaA View Post
    Oh yes you are right....

    Front dif:
    Brushed Stampede: TRX6778
    VXL: TRX5379X or TRX5379R

    Rear dif:
    Brushed Stampede: TRX6779
    VXL: TRX6879 or TRX6879R

    The rest of the dif is the same!!

    I guess I have to put on a bigger pinion gear or a smaller main gear to even out the difference.

    Great tip thank you! I guess thats the root cause!
    The ring gears are different. Also the VXL ring gears on the diff can handle more power.


    Sent from my iPhone using Tapatalk
    Slash Ultimate 4x4, MMX-2200kv/Slash 4x4, MMX-2650

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