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  1. #1
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    castle 2400 vs 3800 on 3s

    I have had the castle 3800 motor on 3s for a few years. i sand bash alot is it worth trying the 2400 version? i have an upgraded slipper and diff and alumin. gearbox, let me know if anyone has this setup. thanks . I did get my motor a bit hot in the summer at times. I dont jump my car all that much anyway.

  2. #2
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    I went from the Castle 3800 to the 2400. The 2400 is way faster because you can run a big pinion and not lose any low end. Get the "Traxxas Funny Car Motor" from eBay for $60.00. It's the same thing.
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  3. #3
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    cool, thanks how high did you gear it on 3s ? I geared the 3800 high on 48p 28/83.

  4. #4
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    I think I'm geared 18/54 with the 2400kv on 3S.
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  5. #5
    RC Turnbuckle Jr. billy-bones's Avatar
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    Quote Originally Posted by Role View Post
    I have had the castle 3800 motor on 3s for a few years. i sand bash alot is it worth trying the 2400 version? i have an upgraded slipper and diff and alumin. gearbox, let me know if anyone has this setup. thanks . I did get my motor a bit hot in the summer at times. I dont jump my car all that much anyway.
    For 3s in the sand a 2400kv is a no-brainer, speed wise with the same gearing the 3800 will blow the 2400 out of the sand so to speak.
    The difference is you can gear the 2400 to be just as fast and keep its cool.
    IMO no motor over 3500kv should be run on 3s all the time for go fast reasons.
    Even with the 2400 in the sand I'd watch the temps, I can get my 2wd street runner up to 150F pretty quick on 3s.
    Last edited by billy-bones; 12-23-2014 at 10:54 AM.
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  6. #6
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    Are mod1 pinions the same as p32 ones? I m trying to find a few pinions for my 32p team associated spurs. I appreciated any help . thanks!

  7. #7
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    32 pitch = 0.8 Mod
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  8. #8
    RC Turnbuckle Jr. billy-bones's Avatar
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    "Module" is the unit of size that indicates how big or small a gear is.
    It is the ratio of the reference diameter of the gear divided by the number of teeth.
    Module = reference diameter/number of teeth.
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  9. #9
    RC Turnbuckle Jr. rag6's Avatar
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    Mod 1 is not the same as 32 p
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  10. #10
    RC Turnbuckle Jr. billy-bones's Avatar
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    Quote Originally Posted by rag6 View Post
    Mod 1 is not the same as 32 p
    Correct its not, Module is metric and pitch is standard, Mod .08 and 32p are buy chance basically identical.
    This explains far better then I can.
    DP stands for diametric pitch, and is the only kind of pitch used when describing RC gears so "DP" and "P" and "pitch" are interchangeable terms. (Worm gears and rack gears are the types of gears that have non-diametric types of pitch.)

    Diametric pitch is how many teeth per inch-diameter (hence the name) of a pinion or spur gear. A 32P gear, for instance, has 32 teeth for every inch the gear is in diameter:
    - a 1-inch diameter gear would have 32 teeth
    - a 1.25-inch diameter gear would have 40 teeth
    - a 2-inch diameter gear would have 64 teeth

    Higher pitches (48P, 64P) have more, finer teeth for a given gear diameter than lower pitch (32P) which are larger and coarser.

    "Pitch" is the standard/imperial term. "Module" is the metric term and is calculated slightly differently. Module is the millimetres-of-diameter per tooth, rather than teeth-per-diameter used with Pitch.

    0.8-module (sometimes abbreviated to mod-0.8, Module 0.8, or 0.8M) means the tooth is 0.8mm in diameter for each tooth, so a 100-tooth gear would be 80mm in diameter.

    With Module, lower numbers (0.6, 0.4) means lower diameter for a given tooth count (finer teeth) and higher numbers (0.8, 1.0) mean larger diameter for a given tooth count (coarser teeth).

    Bigger teeth (lower pitch or higher module) are stronger, but noisier and since you have to move in 1-tooth increments when changing gear ratio, the available ratios can't be tuned as finely. Finer teeth are quieter and more finely-adjustable, but aren't as strong.

    0.8M and 32P are practically identical in tooth size, and these are the only compatible sizes between metric and standard (in common use with RCs). All other modules/pitches commonly used in RC are not compatible with any other. If you come across a "metric 48P" then it is NOT compatible with a true standard 48P.

    Common pitch per vehicle type:
    - 1/8th electric and nitro: 1.0M
    - 1/10 nitro: 1.0Module or 32P/0.8M
    - 1/10 electric 2WD offroad: Usually 48P. High-power brushless conversions often convert to 0.8M/32P to handle the extra torque
    - 1/10 electric 4WD offroad: Often 0.8M/32P
    - 1/10 electric onroad: Often 48P, but 0.6M for many Tamiya and some others. Sometimes 0.4M or 64P for higher-end cars.
    - 1/16 and 1/18: 48P or 0.4M. I'm not so sure about these smaller cars, though.

    Some helis use uncommon pitches like 0.7M or 0.5M.
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  11. #11
    RC Turnbuckle Jr. rag6's Avatar
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    Good quote billy
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  12. #12
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    Quote Originally Posted by billy-bones View Post
    For 3s in the sand a 2400kv is a no-brainer, speed wise with the same gearing the 3800 will blow the 2400 out of the sand so to speak.
    The difference is you can gear the 2400 to be just as fast and keep its cool.
    IMO no motor over 3500kv should be run on 3s all the time for go fast reasons.
    Even with the 2400 in the sand I'd watch the temps, I can get my 2wd street runner up to 150F pretty quick on 3s.
    Why is the 3800 faster then the 2400 same battery and gearing? Im running a 3930kv 3s. I took my nephew's 2400 castle on 3s and it did'nt seem to get up to speed as fast.

  13. #13
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    3800 is 20% faster than the 2400kv...With the same gearing...The 2400 runs cooler.

    3800kv x 1000 kv per rpm 38,000 rpm

    The 2400kv can go higher in pinion gears before the 3930kv overheats.
    Last edited by Cyclone1122; 12-25-2014 at 09:46 PM.

  14. #14
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    Quote Originally Posted by Cyclone1122 View Post
    3800 is 20% faster than the 2400kv...With the same gearing...The 2400 runs cooler.

    3800kv x 1000 kv per rpm 38,000 rpm

    The 2400kv can go higher in pinion gears before the 3930kv overheats.
    Makes sense now. Thanks. I think in goin with the 2400, I like the cooling temps and like the 3s juice!!

  15. #15
    RC Turnbuckle Jr. rag6's Avatar
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    The 2400 will also put out muchmore torque , while staying cool when you gear up...
    Ya can't polish fertilizer...

  16. #16
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    It was said that it only makes sense to run 3S-4S to anything under 3000kv...that's why they do come alive.

  17. #17
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    just got my 2400 in, wow I can gear it to the moon!!! 25/54 on 3 s right now

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