R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 12-29-2012, 04:33 PM   #1
Tech Apprentice
 
Join Date: Nov 2008
Posts: 63
Trader Rating: 49 (100%+)
Default motor runs faster backwards

Hi all,

I just bought an old HPI RS4 mini (not micro). It included a Nosram Tomahawk esc,and a Nosram brushed Super Stock motor. I know the electronics are old, but they still work. The question I had is why would the motor run faster backwards then frontwards. It's kind of frustrating, because I know the motor goes faster than it's running right now, because it's better backwards. I've run across this with another car I have, but never knew why. I guess I could switch motor leads, but I was wondering why this would happen. Anyone know? Thanks for your help.
rody63 is offline   Reply With Quote
Old 12-29-2012, 04:55 PM   #2
Tech Regular
 
KC10Chief's Avatar
 
Join Date: Oct 2012
Location: Edmond, OK
Posts: 299
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by rody63 View Post
Hi all,

I just bought an old HPI RS4 mini (not micro). It included a Nosram Tomahawk esc,and a Nosram brushed Super Stock motor. I know the electronics are old, but they still work. The question I had is why would the motor run faster backwards then frontwards. It's kind of frustrating, because I know the motor goes faster than it's running right now, because it's better backwards. I've run across this with another car I have, but never knew why. I guess I could switch motor leads, but I was wondering why this would happen. Anyone know? Thanks for your help.
Try swapping the two outside motor leads. Leave the middle one where it is. Then, recalibrate your ESC and radio. Might need to reverse your throttle channel. No guarantees, but this worked on my touring car.
KC10Chief is offline   Reply With Quote
Old 12-29-2012, 05:15 PM   #3
Tech Regular
 
Test Driver's Avatar
 
Join Date: Mar 2002
Location: Australia
Posts: 299
Trader Rating: 9 (100%+)
Default

Brushed motors only have 2 leads. Swapping them over will reverse the motor which wont work in the car. I know when i use to race 540 silver can, the motors were actually retarded from factory which meant they run faster in reverse. Without twisting the com, i don't think there is anything you can do about it ( unless the motor has adjustable timing that is )
__________________
SSE - SmallScaleEngineering
DASH-1
1/12 scale Eurostock
Test Driver is offline   Reply With Quote
Old 12-29-2012, 05:25 PM   #4
Tech Master
 
Geezatec's Avatar
 
Join Date: Oct 2007
Posts: 1,460
Default

Switching polarity, car may run backwards. remove the top of diffs and diff gears turn them 180degrees. This will turn correct the direction.
Geezatec is offline   Reply With Quote
Old 12-29-2012, 05:27 PM   #5
Suspended
 
Join Date: Dec 2012
Posts: 55
Default info

Ucan turn endbell 180 degrees.. and swap motor leads that should fix ur issue..dont u love when people answer with Wrong info cause they dont read the post..
Carpet Racer69 is offline   Reply With Quote
Old 12-29-2012, 05:41 PM   #6
Tech Master
 
Geezatec's Avatar
 
Join Date: Oct 2007
Posts: 1,460
Default

Quote:
Originally Posted by Geezatec View Post
Switching polarity, car may run backwards. remove the top of diffs and diff gears turn them 180degrees. This will turn correct the direction.
disregard my post cuz it has ball diffs
Geezatec is offline   Reply With Quote
Old 12-30-2012, 10:51 AM   #7
Tech Rookie
 
Join Date: Mar 2012
Location: Ontario
Posts: 18
Default

Quote:
Originally Posted by rody63 View Post
Hi all,

I just bought an old HPI RS4 mini (not micro). It included a Nosram Tomahawk esc,and a Nosram brushed Super Stock motor. I know the electronics are old, but they still work. The question I had is why would the motor run faster backwards then frontwards. It's kind of frustrating, because I know the motor goes faster than it's running right now, because it's better backwards. I've run across this with another car I have, but never knew why. I guess I could switch motor leads, but I was wondering why this would happen. Anyone know? Thanks for your help.
Sounds like your throttle is reversed. Pulling the trigger is actually reverse (motor doesn't turn as fast typically in reverse) and applying brakes/reverse is "forward" on the motor.

I think this will help...Start by changing your throttle servo direction on the controller. You will most likely have to swap the motor leads around too.

Cheers
__________________
__________________________________________________
Xray T4 '16, Tamiya 417v5, Tamiya M05 pro, Tamiya 501X WE, Losi XXX-SCT, Losi/MIP SCTE, Xray XB808e, Xray XT9e.
zimmie is offline   Reply With Quote
Old 12-30-2012, 11:17 AM   #8
Tech Fanatic
 
Join Date: Aug 2008
Location: Stockport, UK
Posts: 982
Default

I would say the ESC has been calibrated backwards, and then the motor leads have been swapped over to get it to run the right way, so when you pull the throttle the ESC is going backwards.

Swap the motor leads round and then switch the servo reverse on the transmitter and it should run faster in forwards. You might need to recalibrate it to reset the end points.
terry.sc is offline   Reply With Quote
Old 01-01-2013, 07:41 PM   #9
Tech Apprentice
 
Join Date: Nov 2008
Posts: 63
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by terry.sc View Post
I would say the ESC has been calibrated backwards, and then the motor leads have been swapped over to get it to run the right way, so when you pull the throttle the ESC is going backwards.

Swap the motor leads round and then switch the servo reverse on the transmitter and it should run faster in forwards. You might need to recalibrate it to reset the end points.
Well, I ended up doing this, and it actually was faster, the only problem was that for some reason the car would stop responding, and stall. I could get it to go again by hitting reverse momentarily, and then going forward, but it kept cutting out. When I put things back the way the were before, it worked perfect, although slower.
rody63 is offline   Reply With Quote
Old 01-01-2013, 08:45 PM   #10
Tech Master
 
Geezatec's Avatar
 
Join Date: Oct 2007
Posts: 1,460
Default

Quote:
Originally Posted by rody63 View Post
Well, I ended up doing this, and it actually was faster, the only problem was that for some reason the car would stop responding, and stall. I could get it to go again by hitting reverse momentarily, and then going forward, but it kept cutting out. When I put things back the way the were before, it worked perfect, although slower.
Many ESC has a delay when useing reverse, so it doesnt go into into reverse or forward immediately. That why reverse is illegal in ROAR events. Cause havick. Usually have to brake twice before it goes into reverse, or visa-versa.
Geezatec is offline   Reply With Quote
Old 01-01-2013, 09:35 PM   #11
Tech Master
 
Join Date: Dec 2004
Posts: 1,131
Default

Quote:
Originally Posted by rody63 View Post
Hi all,

I just bought an old HPI RS4 mini (not micro). It included a Nosram Tomahawk esc,and a Nosram brushed Super Stock motor. I know the electronics are old, but they still work. The question I had is why would the motor run faster backwards then frontwards. It's kind of frustrating, because I know the motor goes faster than it's running right now, because it's better backwards. I've run across this with another car I have, but never knew why. I guess I could switch motor leads, but I was wondering why this would happen. Anyone know? Thanks for your help.
Start fresh with everything. Reset the remote setting to proper setting. Check over all wires and reset your speedo. I'm sure you will find your problem
Juan Aveytia is offline   Reply With Quote
Old 01-01-2013, 11:20 PM   #12
Tech Champion
 
Radio Active's Avatar
 
Join Date: Jun 2003
Location: Newcastle, Australia
Posts: 7,072
Trader Rating: 2 (100%+)
Default

If all else fails you could buy a Mardave. The motor in them runs backwards to everything else.
__________________
Reigning NSW 4WD Group 20 Champion
Member: Maitland Radio Car Club (http://www.morcc.com.au)
twitter: @dvcotton
Australian 12th Scale hastag: #EP12AU
Radio Active is offline   Reply With Quote
Old 01-02-2013, 06:00 AM   #13
Tech Fanatic
 
Join Date: Aug 2008
Location: Stockport, UK
Posts: 982
Default

Quote:
Originally Posted by rody63 View Post
Well, I ended up doing this, and it actually was faster, the only problem was that for some reason the car would stop responding, and stall. I could get it to go again by hitting reverse momentarily, and then going forward, but it kept cutting out. When I put things back the way the were before, it worked perfect, although slower.
If this happens it means the motor and ESC were wired correctly the first time, and you have now put it back to what it should be. When everything was swapped round it stopped because the ESC has a built in timer that limits how long reverse can be used before it cuts off, to prevent people being able to run the ESC the wrong way round. Assuming you are getting full forwards throttle, which you should have if you have reset it, then if the motor ran faster forwards with everything swapped over then the problem is the ESC is damaged. It will be because some of the FETs are damaged and it would need repairing, but it's usually cheaper to buy a new basic ESC.
terry.sc is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
CRC Battle Axe, GenXPro 10, 1/10th pan, Brushless, Lipo,4c, Road, Oval,TipsandTricks John Stranahan Electric On-Road 1776 03-01-2016 01:18 PM
Mid Motor TLR 22/22T Thread mdwalsh Electric Off-Road 410 01-21-2015 07:48 PM
Silver Can Motor Tips/Tricks TAMIYAMANUK Electric On-Road 1741 04-11-2014 02:44 PM



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 07:04 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net