R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric Off-Road

Thread Tools Search this Thread
Old 01-18-2009, 07:34 PM   #1
Tech Initiate
Join Date: Jan 2009
Location: Mesquite, TX
Posts: 39
Default motor issue

I have a ESC that I think is for stock, not sure of motor but know it is a mod. When you try to accelerate it is skiping or going on and off until is gains speed. Once spped is acheaved it runs fast but next corner when back on the throttle it skips or stutters again. Is it because of the mod motor with a speed control for stock. Thanks in advance for any help. This is a brushed system.

Last edited by lt1zwb96; 01-18-2009 at 07:35 PM. Reason: more info
lt1zwb96 is offline   Reply With Quote
Old 01-18-2009, 07:41 PM   #2
Tech Master
LIVipers's Avatar
Join Date: Jun 2008
Location: Massapequa Park
Posts: 1,079
Trader Rating: 29 (100%+)

Sounds to me as though your esc can't meet the amperage that the motor requires and "turbo lags" until it can supply the amps. Your best bet would be to get an esc that can handle a mod motor. This is an odd problem with a brushed system. It is more common in sensorless brushless systems.
LIVipers is offline   Reply With Quote
Old 01-19-2009, 09:10 AM   #3
Tech Initiate
Join Date: Dec 2008
Location: london,ON
Posts: 46

It would have been better if you had posted the esc name and the number of turns the motor has.

anyways, you've got either a shorted winding and/or dirty/burned comm segments in the motor. you may have loose or damaged cappacitors on the motor. There may be an issue with your connectors/battery. when accelerating, low turn mod motors will bring the voltage down too low for the electronics to function IF you have poor batteries and connectors.

the esc doesn't sound like its causing the problem. if the motor was too much for it it will thermal (if equiped with a thermal shut-off which takes a while to reset) or it will burn up. it may still burn up if it is infact for stock, time will tell.
Current active RC's; Brushless Xray XB8, CRC Pro10, Tamiya M03, Xray M18, Losi Micro-T. Inactive list; Losi XXX-S, Duratrax Evader st, Traxxas TRX-1, Traxxas E-maxx, Brushless Ofna 9.5, Corally sp12m
Crazy_jay is offline   Reply With Quote
Old 01-19-2009, 10:01 PM   #4
Tech Initiate
Join Date: Jan 2009
Location: Mesquite, TX
Posts: 39

Not sure of the turns but I think I was told 14 and soldered strait to the ESC. The speed control is a duratrax but that is about all I know. Batts and conectors are all new. Truck had been sitting a while and may just need a good cleaning of the motor. I will try it with a good stock motor I have and see if that fixes. Thanks for the replies.
lt1zwb96 is offline   Reply With Quote
Old 01-20-2009, 12:35 AM   #5
Tech Master
JeromeK99's Avatar
Join Date: Jun 2008
Location: Loma Linda, CA - USA
Posts: 1,137
Trader Rating: 3 (100%+)

Sounds to me like the motor needs some TLC.

Brushed motors have to be maintained often to keep them running correctly. The problem could be old, worn and/or chipped brushes combined with a comm that probably needs to be cut if it is still any good.

They also need to be cleaned out and oiled often as well...

Take it down to your local track and ask some of the old-timers out there... your local hobby shop will want to sell you a new motor first.. which may be something you might need in the long run.

Good luck!

JeromeK99 is offline   Reply With Quote
Old 01-20-2009, 02:38 AM   #6
Super Moderator
R/C Tech Elite Subscriber
Join Date: Oct 2007
Location: Rochester Hills Michigan
Posts: 7,232

It's also possible that you are overgeared, too large of a pinion. A 14 turn needs a smaller pinion than a stock motor. How hot does the motor and esc get?
Dave H is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Meakin Park Forum OHBRAD Australian Racing 12383 10-25-2016 04:30 PM
Maryland, Pa. Va. Wash. DC. area Racers Casey Racing Forum 23441 05-05-2014 08:45 PM
GRP... Engine... Thread... xlgraphicspro Offroad Nitro Engine Forum 2135 09-10-2013 08:46 AM
Electric 1/8th Scale conversion kits. DJ1978 Electric Off-Road 19920 04-03-2013 08:30 AM
B4 motor/speed control issue? BCrumB4 Electric Off-Road 20 08-08-2008 04:53 PM
brushless motor question for a 1/8th buggy conversion downunder23 Electric Off-Road 25 02-26-2007 04:15 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 05:56 AM.

Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0