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  1. #1

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    Speed Problem

    Hey, just purchased by first hobby grade R/C today, a HPI RACING MINI-TROPHY - #103034. I am running a 2C 7.4 - 5000mah LIPO and the truck ran great on the first run which I stopped after about 15 minutes. On the 2nd run it would only run at about 1/2 speed for 10 minutes then really started to slow down, stopped it and could smell something burning. Disconnected the battery right away and pulled it out - no smell from the battery.

    Let it all cool down overnight and hooked it up in the morning, no smell however running extremely slow - like walking speed.

    Checked the voltage on the battery it is right up - tried resetting the throttle setting on the transmitter, nothin'.

    Any ideas?

  2. #2
    SyCo_VeNoM's Avatar
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    RE: Speed Problem

    probably the motor
    If I remember it right its brushed (if it is) pull the 2 wires off that go to the esc, and connect it straight to the battery. If the motor spins fast then its the ESC.
    With great speed comes greater repair bills.
    Click on My models to see some of what I own. Eventually will add the rest

  3. #3

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    RE: Speed Problem

    Thanks! Did that and it appears to be spinning at same speed.

    Will take it back to the store - should be a warranty fix hopefully!

  4. #4
    The_Shark's Avatar
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    RE: Speed Problem

    lipo eats brushed motors just so you know...
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  5. #5
    Haddi Taha's Avatar
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    RE: Speed Problem


    ORIGINAL: The_Shark

    lipo eats brushed motors just so you know...
    I normally run silvercans and lipo with good luck but yeah, brushed motors cannot handle lipo that well. You can get a cheap brushless system from hobbypartz which will give you more speed, runtime and will last longer. If you are going to pay more than $40 for a brushed esc, go to brushless.

    Thunder Tiger MT4 G3- Tamiya TA06 Pro

  6. #6

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    RE: Speed Problem

    Called HPI - they are mailing out a new motor under warranty. Took the LIPO back to the Hobby Store where purchased and got a Nimh instead - hopefully the replacement motor will last longer!

    Thanks for the help and recommendations!

  7. #7
    SyCo_VeNoM's Avatar
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    RE: Speed Problem


    ORIGINAL: Haddi Taha


    ORIGINAL: The_Shark

    lipo eats brushed motors just so you know...
    I normally run silvercans and lipo with good luck but yeah, brushed motors cannot handle lipo that well. You can get a cheap brushless system from hobbypartz which will give you more speed, runtime and will last longer. If you are going to pay more than $40 for a brushed esc, go to brushless.

    ditto run my tamiya 27t motors fine on lipo
    only way it would burn a motor out is if the vehicle is geared high from the get go.


    Also the HPI motors if its the 15t those are turds.. I had one burn out in 4 mins on NiMh
    With great speed comes greater repair bills.
    Click on My models to see some of what I own. Eventually will add the rest

  8. #8
    Haddi Taha's Avatar
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    RE: Speed Problem


    ORIGINAL: SyCo_VeNoM


    ORIGINAL: Haddi Taha


    ORIGINAL: The_Shark

    lipo eats brushed motors just so you know...
    I normally run silvercans and lipo with good luck but yeah, brushed motors cannot handle lipo that well. You can get a cheap brushless system from hobbypartz which will give you more speed, runtime and will last longer. If you are going to pay more than $40 for a brushed esc, go to brushless.

    ditto run my tamiya 27t motors fine on lipo
    only way it would burn a motor out is if the vehicle is geared high from the get go.


    Also the HPI motors if its the 15t those are turds.. I had one burn out in 4 mins on NiMh
    tamiya silvercans are surprisingly reliable

    Thunder Tiger MT4 G3- Tamiya TA06 Pro


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