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  1. #1
    RC poster
    Join Date
    Jul 2020
    Posts
    5

    RC newbie Looking for E-Maxx Upgrade Suggestions!

    Hey everyone, I'm extremely new to the RC Hobby (beyond Tyco toys as a kid). I picked up this Emaxx (I think it's a 3903??) a few years ago at an auction and just recently got it going. I promptly crashed it and broke multiple parts, replaced parts, broke more stuff, replaced, broke.... you get the picture. Part of my issues were my lack of knowledge. However, most of my issues came from poor previous ownership and I simply didn't know things were installed wrong until it was too late.

    Anyway, the steering is extremely slow and not very strong. If you turn left or right using the controller, the steering doesn't have enough power to turn the wheels unless the vehicle is in motion. Also, It turns left in a MUCH tighter circle than turning right. Would that be caused by the weak steering servo's or is there some sort of setting to adjust?

    So here's my questions:
    1. What steering servo's are recommended for an E-Maxx? These are simply too weak.
    2. What do I need to do to go Brushless and is there a recommended motor to switch to?



    Current Mods I've done:
    • RPM Blue Control arms
    • RPM Axle Carriers
    • RPM Bulkheads
    • RPM Shock Towers
    • RC Raven Black Anodized Aluminum Bottom Braces
    • RC Raven Silver Dual Rate Shock Springs
    • Traxxas Big Bore Shocks (About to oil that came with them to 50wt)
    • 5153R Axle Cups
    • 5143A & 5141A Toe Links
    • RPM Bulkhead braces (ordered)
    • RPM True Track (Ordered)


    List of Mods it came with:
    • Fubata Controller
    • Fubata R603FF Receiver
    • Fubata FP-S148 Steering Servo's
    • Traxxas EVX-2 Speed Controller (I'm guessing it's an aftermarket upgrade??)
    • Metal Cage that fits under the body
    • 5451R Axles

















  2. #2
    RC Turnbuckle Jr. olds97_lss's Avatar
    Join Date
    Dec 2003
    Location
    Dekalb, IL
    Posts
    3,369
    Yeah, those servos are slow and weak. 42oz/.22sec @6V, so 84oz combined.

    You can get one of these to replace both of those, should work fine off the stock esc at 6V:
    https://www.amazon.com/gp/product/B079HZL171

    I run one in my stampede, but also ran it on my ERBEv2 as a single servo for a while until I upgraded to an esc that would run 7.2V, then I got a servo that would use the higher voltage. That servo is rated for 300oz/.16sec @6V. Also, it's waterproof.

    I don't know what the emaxx can take in regards to brushless. Maybe a decent 1/8th esc and 4074 2200kv motor with the punch dialed back. Something like this:
    https://www.amazon.com/38010401-Comb.../dp/B01I2CALYM

    Or something like this:
    https://www.amazon.com/Castle-Creati...v-CSE010013901

    I like hobbywing esc's though as you can adjust them using the fan port vs unplugging the esc from the receiver.

    That hobbywing combo is similar in spec (maybe even stronger esc) than what came on the v1 brushless revo. Should do fine on 4S in a maxx.

    Or even just a 1/8th take off on ebay like this:
    https://www.ebay.com/itm/Arrma-Krato...n/383548770167

    Relatively capable motor/esc. I run those motors in a couple trucks and ran the esc quite a while in my outcast on 4S and 6S. You can get the hobbywing program box to adjust it as well for $12. Again, dial the punch way down just to help avoid breaking stuff.
    Last edited by olds97_lss; 10-06-2020 at 01:14 PM.
    https://www.youtube.com/c/olds97lss

  3. #3
    RC Turnbuckle Jr. ReglarGuy's Avatar
    Join Date
    Feb 2012
    Location
    Eastern Shore, Maryland
    Posts
    4,590
    Olds is definitely giving you good advice. I, myself, personally go with the Castle 2200kv motor, Castle MM2 ESC, and the stock Traxxas servo's along with the metal gear kit installed. I've had very good luck with that setup.

    Life's to short to be a sour puss.

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