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  1. #1
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    Rally x Spped Question

    Okay got the suspension all done buggy handles great. Now I am running a 15 pinion and 54 ring. Wife and I went to play yesterday and basically her buggy tore me a new one. She has a bone stock Losi rally it has 3900 fuze in it. Why is that soo much faster then mine that is modified? Is it the 4 pole motor or the 3900 rating What is the velineon equal too I thought it was like a 3500kv?
    Also running a 11.1 lipo 30c the traxxas looked like it was doing maybe 40-45 and her buggy was darn close to 60mph
    Last edited by Dadx2mj; 06-09-2014 at 12:57 PM. Reason: Language

  2. #2
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    The 3900kv is 4 pole which is more powerful all around compared to the vxl system. It also has a bit to do with the weight and friction caused in the driveline.
    Spartan Jet Boat
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  3. #3
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    Well they are both 4wd and hers is heavier also. I honestly had trouble with the difference in performance. Even on the 7.4 two cells her buggy rips all four tires, and is closer to the performance of mine on 3 cell. The box that the rally came in stated it should have been closer to 60mph, I honestly thought something was wrong with it, but I think 45 is closer to reality with the 15/54 set up. Didn't want to go 19/54 because I was afraid of heat issues.

  4. #4
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    It has something to do with gearing, check out what differencial ratio on losi and compare it to traxxas.

  5. #5
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    Quote Originally Posted by humayrayakongkinaon View Post
    It has something to do with gearing, check out what differencial ratio on losi and compare it to traxxas.
    Losi is 18/45 traxxas is 15/54

  6. #6
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    Well there you go, 2.5 rario vs 3.6 ratio... The losi is probably a low friction roller so they can take that low of a gearing without burning up the motor.
    Spartan Jet Boat
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  7. #7
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by Bulldogger View Post
    Losi is 18/45 traxxas is 15/54
    Is that pinion/spur? Is losi running mod1 gears.

  8. #8
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    Quote Originally Posted by humayrayakongkinaon View Post
    Is that pinion/spur? Is losi running mod1 gears.
    Those are pinion and center diff gears. I don't know what is in front/rear differentials as far as ring and pinion. What is mod1 gears

  9. #9
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    Quote Originally Posted by ManDime View Post
    Well there you go, 2.5 rario vs 3.6 ratio... The losi is probably a low friction roller so they can take that low of a gearing without burning up the motor.
    Well then why is the traxxas slower out of the hole and at top end.

  10. #10
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    Quote Originally Posted by Bulldogger View Post
    Well then why is the traxxas slower out of the hole and at top end.

    the gearing in the diffs might be different is all I can think of. Also a 4pole motor has enough to give you insane acceleration compared to the vxl system.
    Spartan Jet Boat
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  11. #11
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    Quote Originally Posted by ManDime View Post
    the gearing in the diffs might be different is all I can think of. Also a 4pole motor has enough to give you insane acceleration compared to the vxl system.
    That I am all too aware of.....

  12. #12
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by Bulldogger View Post
    What is mod1 gears
    Mod1 or 25 Pitch which are larger tooth than Mod.8 or 32 Pitch


    traxxas differential gear ratio (4x4) 2.85:1

  13. #13
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    Yes they are Mod1 design

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