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12-14-2008, 10:53 AM
| #1 |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
|  Lack of power
I'm having some issues with my crawler. I am running the following: Tekin Rebel 2 DX3r Receiver hitec 7955 for steering 645mg for dig DNA dig 55t Integy Lathe Motor 8 cell 1500 nimh saddle pack from holmes hobbies I'm running a CC BEC wired per Castle's instructions. I'm running a droop suspension with TLT axles, to Panther Cougars on Double phatty beadlocks. 4 bearings in the front, zero in the rear. My crawler seems to kill the battery pack within 10 minutes of use. I used to run just a 645mg and I was getting around 45 mins of use out of the pack,. Now with the upgraded servo, second dig servo, and the cc BEC, the pack is dead with 10 mins. I understand that there is a higher draw on the system, but I didn't think it would kill it that soon. I have two identical 1500 packs, and both act the same. I also have a lack of power and torque. Even trying to climb a 50* carpeted incline is a struggle, and this is with a fresh pack. The 55T lathe should have plenty of torque to at least spin the wheels, but it appears the motor just stalls, and will start to overheat. Should I jump to Lipo? Any ideas? |
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12-14-2008, 11:36 AM
| #2 |
| Rock Crawler Join Date: May 2008 Location: Mansfield, PA
Posts: 560
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Im not sure what to tell you.... other than, I run almost an identical setup as you and I get about 1 HOUR of run time with my small MaxAmps 3s 1550mah lipo and they only cost $49.99 when i bought them  Now the price has gone up a bit.link to batt. http://www.maxamps.com/Lipo-1550-111-Pack.htm Go Lipo... you will never go back  |
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12-14-2008, 11:40 AM
| #3 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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How old is the motor? Have you ever replaced the brushes? If not, that is your problem.
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12-14-2008, 08:01 PM
| #4 |
| owner, Holmes Hobbies LLC   Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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My thoughts are either a bad cell in your pack, or your motor needs a comm and brush cut. Could be both.
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12-14-2008, 08:50 PM
| #5 | ||
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
| Quote:
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12-15-2008, 06:52 AM
| #6 | |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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12-17-2008, 04:59 AM
| #7 |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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I put in the 45T. Power is back, but my motor gets extremely hot under load while climbing, to the point it will smoke. I haven't had a chance to verify the runs times.
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12-17-2008, 07:23 AM
| #8 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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That doesnt sound correct. These high turn motors should not be getting hot at all. How do you have the timing adjusted?? I would definitely replace the brushes in that other motor and put it back in... |
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12-17-2008, 07:24 AM
| #9 |
| Quarry Creeper Join Date: Aug 2008 Location: in the basement cussing my broke ass rig
Posts: 329
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Are you using molex style connectors? If so, get rid of them and get some lower resistance connectors. Just a thought...
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12-17-2008, 07:52 AM
| #10 | ||
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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12-17-2008, 08:19 AM
| #11 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Don't trust factory timing, it could have came loose during shipping. Look and see if it needs retiming Caring for your new Brushed motor Any binding in your drivetrain? |
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12-17-2008, 08:36 AM
| #12 | |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
| Quote:
No binding, but the rig is relatively heavy @ 7lbs. Double phattys, mip shafts, etc. I reprogrammed the ESC (again). Flat surfaces aren't a problem, but as soon as it gets under load during a ramp incline climb, it heats up. | |
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12-18-2008, 06:56 PM
| #13 |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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just managed to drain a pack in 5 mins...something is leeching power. Whenever I try to climb something, the rig just stalls and the motor starts to smoke.  |
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12-18-2008, 08:28 PM
| #14 |
| Rock Stacker Join Date: Jan 2008 Location: Houston
Posts: 66
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did you check for any shorts? You could be grounding out somewhere and making a resistor. Maybe a little too much solder and you are creating a short?
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12-18-2008, 10:56 PM
| #15 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Did you check the motor timing?
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12-19-2008, 12:41 AM
| #16 |
| Quarry Creeper Join Date: Aug 2008 Location: Gadsden, Alabama
Posts: 198
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Switch back to your old servo/dig setup, or just run the front servo only, and see if the problems go away. One of your new servos could be bad, or something else that you upgraded/changed. Go back to the setup that last worked correctly and see if the problems go away.
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12-19-2008, 04:51 AM
| #17 | |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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12-19-2008, 04:52 AM
| #18 | |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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There are not shorts, exposed wires, etc in the system. I even have the CC BEC disconnected. | |
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12-19-2008, 06:25 AM
| #19 |
| I wanna be Dave Join Date: Sep 2005 Location: Houston, TX
Posts: 16,952
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Have you checked the motor brushes yet? When the truck stops running, does it gradually (over a few minutes) get slower or does it come to a dramatic stop? If it is the latter, then I am pretty sure that worn brushes are your problem. I just recently went through this same issue.
Last edited by JeremyH; 12-19-2008 at 06:27 AM. |
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12-19-2008, 07:30 AM
| #20 |
| Quarry Creeper Join Date: Oct 2005 Location: MD
Posts: 323
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No, the brushes are not worn. I swapped in another motor with a very low run time on it, and the symptoms were the same. I'm leaning towards a faulty ESC.
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Linear Mode
