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Speed Problem

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Old 09-30-2012, 09:26 AM
  #1
cjhike
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Default 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?
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Old 09-30-2012, 09:45 AM
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Default 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.
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Old 09-30-2012, 10:47 AM
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Default 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!
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Old 09-30-2012, 04:06 PM
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Default RE: Speed Problem

lipo eats brushed motors just so you know...
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Old 09-30-2012, 05:06 PM
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Haddi Taha
 
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Quote:
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.

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Old 10-01-2012, 09:29 AM
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cjhike
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Default 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!
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Old 10-01-2012, 10:10 AM
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Quote:
ORIGINAL: Haddi Taha


Quote:
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
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Old 10-01-2012, 05:32 PM
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Haddi Taha
 
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Quote:
ORIGINAL: SyCo_VeNoM


Quote:
ORIGINAL: Haddi Taha


Quote:
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

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