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Thread: Gearing?

  1. #1
    RC Racer
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    Gearing?

    Hello guys, What are you running for gears in your E Revos. I installed a Tekin 2250 KV Truggie motor and was wondering what I can run safely for gearing. I know how I'm going to be using it matters, some long runs on pavement and some dirt roads and a little driving on grass. I bought a 16 pinion and have stock (65?) spur for now. I run 14 58 in my Summit no problem. My thought I can at least run that? What are you guys running? You might want to know what I;'m running for tires, Trencher X.

    thanks!

  2. #2
    RC Turnbuckle Jr. 87 GN's Avatar
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    14/58 is a bit low, I run 4s 21/54 with Badlands. I would start at least 18/54 4s or 6s.


    A temp gun is kind of a must have.....

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

    Motor ~ 180/190*F (82/88*C) maximum, ideally 140/160*F (60/71*C), temps can be 10*F higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F (65*C)
    Lipo's ~ 140*F (60*C) max, ideally 100/120*F (38/49*C).........



    Diff ratio

    4s = 40 mph
    5s = 50 mph
    6s = 60 mph

    change the cell count, spur & pinion count, & tire size.


    BrianG speed chart:

    http://www.scriptasylum.com/rc_speed/top_speed.html

    Copy / paste: Import this:


    Differential Ratio: 2.8461538461538463
    Transmission Ratio: 1.8333333333333333
    Other Ratio: 1
    Spur Tooth Count: 54
    Pinion Tooth Count: 21
    Total Voltage: 22.20
    Motor KV: 2200
    Tire Diameter (inches): 5.9
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor Coil Resistance: 0.006
    Spur/Pinion Ratio: 3 : 1
    Total Ratio: 15.65385 : 1
    Tire Circumference (inches): 18.54 inches (470.8 mm)
    Rollout: 1.18:1
    Would you go flip my truck back over??

  3. #3
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    87GN, thank you, Right at the moment I am running stock tires I have Trencher X but have not installed yet. I am running 4s, running stock Spur (62?) and 16 pinion.
    My motor didn't go above 102* and esc was at 99* Temps aren't an issue YET!! LOL!! I'll order some other gears and get this rig hummin'!

    thanks again

  4. #4
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    I am running a Tekin 2000KV truggy at 17/54 on 4s with Trenchers. I have been considering going to 19/64 but have yet to do so because I am happy with the speed I am getting right now, mainly because I don't have much running room in my back yard. I am seeing temps around 150F on the motor and 140F on the esc after 30 min of bashing. I agree with 87GN that 16/62 is low.
    Last edited by Daedalus; 10-23-2013 at 06:05 PM.
    E-Revo RX8 2000KV
    Rustler VX4 3900KV
    2WD Slash

  5. #5
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    I ordered some gearz, I have 21/ 52 gearz on there way. It is a starting place....

  6. #6
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    Let me know what you get for temps, to help me know how far I can push mine when I am ready to do so.
    E-Revo RX8 2000KV
    Rustler VX4 3900KV
    2WD Slash

  7. #7
    RC Turnbuckle Jr. 87 GN's Avatar
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    Quote Originally Posted by Daedalus View Post
    I am running a Tekin 2000KV truggy at 17/54 on 4s with Trenchers. I have been considering going to 19/64 but have yet to do so because I am happy with the speed I am getting right now, mainly because I don't have much running room in my back yard. I am seeing temps around 150F on the motor and 140F on the esc after 30 min of bashing. I agree with 87GN that 16/62 is low.
    19/54 and the 2000kv is a start, being a lower KV you really need to think about 5s or 6s to wake up that motor...

    Quote Originally Posted by 04zrx View Post
    I ordered some gearz, I have 21/ 52 gearz on there way. It is a starting place....
    52??

    Quote Originally Posted by Daedalus View Post
    Let me know what you get for temps, to help me know how far I can push mine when I am ready to do so.
    Remember he is running a 2250kv not a 2000kv...
    Would you go flip my truck back over??

  8. #8
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    52, am I going to be in trouble with temps?? I wasn't able to find many other options I guess I don't know where to look. If anyone wants to direct me to a good source for gearz please do.

  9. #9
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    Quote Originally Posted by 87 GN View Post
    19/54 and the 2000kv is a start, being a lower KV you really need to think about 5s or 6s to wake up that motor...
    I have thought about going to 6S but I really don't have the running room for that, I struggle getting the full potential of my set up right now in my back yard. The street I live on is barely long enough to get any good speed runs on.

    Quote Originally Posted by 87 GN View Post
    Remember he is running a 2250kv not a 2000kv...
    Yeah, I figure with having a lower KV on my set up I can run a higher gearing than you can with the 2250kv, and be good with the temps. In general it will help define a baseline for Tekin setups in an E-REVO which I have yet to find online.
    E-Revo RX8 2000KV
    Rustler VX4 3900KV
    2WD Slash

  10. #10
    RC Turnbuckle Jr. 87 GN's Avatar
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    it is an even bigger gap, but I have ran an 1800kv with the same gearing and 4s compaired to a 2200kv.
    What a difference, the 1800 was begging for more Voltage.....
    But you are correct it will help define a baseline
    Would you go flip my truck back over??

  11. #11
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    I installed the 20T pinion and "man this thing rips"! I am so impressed at how well it handles, my Summit just rolls over. Still have the stock spur gear (62) , waiting for the 52 to come in. No heat issues to report.

  12. #12
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    "14/58 is a bit low, I run 4s 21/54 "

    21/54 is 2.571 so I will start at 18/52 which is 2.88... but I have, 20/52 which is 2.6 so..... I will be trying that also.

  13. #13
    RC Turnbuckle Jr. 87 GN's Avatar
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    that would be a good start for you......
    Would you go flip my truck back over??

  14. #14
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    I'm running 20/52 in it now. WOW, is this thing fast. I love the speed it rips! I only do short bursts so heat hasn't been a problem thus far. Tonight I will be running so we'll see how it does heat wise.

    Thanks for all the help!!!!

  15. #15
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    I just got my E Revo brushless edition. It has tons of power. I want to get more speed from it. what gears should I use. I am currently running 6s lipo.

  16. #16
    RC Turnbuckle Jr. 87 GN's Avatar
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    post #2
    I would start at least 18/54 4s or 6s.
    Would you go flip my truck back over??

  17. #17
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    is that a 5mm shaft on the revo? And what pinion do I want ? one with a pitch or no pitch

  18. #18
    RC Turnbuckle Jr. 87 GN's Avatar
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    http://www.stormerhobbies.com/cgi-bi...=ns&pn=RRP8721
    well this where I get my pinions, & I use Robinson Racing

    change the last two numbers in the P/N for the tooth count.... RRP87??

    Hardened .8 mod Pinion Gear with 5mm Bore (32 pitch)
    Would you go flip my truck back over??

  19. #19
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    what is the stock gearing?

  20. #20
    RC Turnbuckle Jr. 87 GN's Avatar
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    idb....
    Revo 18/65
    Would you go flip my truck back over??

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