R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 10-21-2008, 11:41 PM   #1
Tech Fanatic
 
dpatterson26's Avatar
 
Join Date: Aug 2007
Posts: 966
Trader Rating: 6 (100%+)
Default LRP SPHERE COMP. TC SPEC/NOVAK MOTORS

I am looking for suggestions, Tonight I was running my foam car with a LRP speedo and Novak 13.5 motor. I was on the track checking my end points and never even make a lap. I went to pull the car off of the track and it smelled hot. I started to diagnose and found that the motor had melted 2 of the 3 segments and was about 180F on the can.

I pulled out my 17.5 rubber car with a different speedo/motor and ran it in the first qual and it was about .4 tenths slower. Didnt think nothing of it. Went out for the 2nd qual and made 4 laps. The car just stopped. I went and got the car and it smelled hot. I pulled the motor apart and had the same thing happen.

I bought a brand new novak 17.5 motor and plugged it into the rubber car. The motor would act like it would go 2 steps forward and one step back. Plugged it into my foam car and it would go intermidantly. I put the motor into a totally seperate car and it worked just fine so it eliminated that motor being bad out of the box.

Has anybody ever seen or experienced this? Did I have 2 speedos go bad on the same night by coincedence?
__________________
eXpress Motorsports•Sweep•Lunsford Racing•ORCA•RC Plus
dpatterson26 is offline   Reply With Quote
Old 10-22-2008, 12:28 AM   #2
Tech Master
 
Drillit's Avatar
 
Join Date: Sep 2007
Location: Oreganastan Pacific Wonderland home to Indoor Farming
Posts: 1,059
Default

can that blue stuff go into 'brushed mode'?
__________________
Mark Tilley
Got T-Bar ? ......... Oregons No ZigZag rule sucks
Bias the weight to the end you want to hit the wall with first!
Searchin fer answers in the Fog.......that's what I found
Drillit is offline   Reply With Quote
Old 10-22-2008, 12:42 AM   #3
Tech Elite
 
rezenclowd3's Avatar
 
Join Date: May 2006
Location: Solvang, CA
Posts: 2,367
Trader Rating: 17 (100%+)
Send a message via AIM to rezenclowd3
Default

Nope. Your best bet is to call LRP and Novak.
__________________
OOMSGFX.COM (no longer painting, but take a look for fun!), Roadrunners RC Club
"Racing drivers have balls, unfortunately, none of them are crystal" (David Coulthard)
"I believe the average IQ of a NASCAR fan is only marginally above the things that hit the windscreen during the race. "
rezenclowd3 is offline   Reply With Quote
Old 10-22-2008, 12:57 AM   #4
Tech Master
 
mugler's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Location: SoCal
Posts: 1,174
Trader Rating: 3 (100%+)
Default

dpatterson26, yes I have experience the same. Have you been free revving your motors, running them with no load??

That will ruin your brushless motor very very quickly and a bad BL motor will very quickly ruin a good BL speedo. Usually free revving will ruin both simultaneousely., that's what happened in my case. What's more you are lucky you have not ruined your 2nd 17.5 motor because a bad BL speedo can also ruin the BL motor as well but less likely.

Send both of the motors and both ESCs in for repairs. If you are lucky one of the motors or ESCs may be still good but it doesn't sound like it.
mugler is offline   Reply With Quote
Old 10-22-2008, 03:59 AM   #5
Tech Initiate
 
Join Date: Oct 2008
Location: Australia, Canberra
Posts: 21
Trader Rating: 1 (100%+)
Default

how does free reving damage the motors, any technical details. Are the ESCs in question sensored? i would have thought they would have protection for over reving cos i could imagine that the motor would end up going so fast that the sensing circuit cracks up and starts putting current into the motor out of timing. This is an interesting subject which every BL owner will want to know about!!
Finite Racing is offline   Reply With Quote
Old 10-22-2008, 10:02 AM   #6
Tech Fanatic
 
dpatterson26's Avatar
 
Join Date: Aug 2007
Posts: 966
Trader Rating: 6 (100%+)
Default

I have not free revved either one of them. Neither motor has been out of either car for quite a while. The highest temp either one has ever seen is
185 degrees. The thing that really gets me is the fact that it was two different motors and two different speedos in two different cars.
__________________
eXpress Motorsports•Sweep•Lunsford Racing•ORCA•RC Plus
dpatterson26 is offline   Reply With Quote
Old 10-22-2008, 11:00 AM   #7
The Evicerator
R/C Tech Elite Subscriber
 
Join Date: Sep 2001
Location: Irvine, CA
Posts: 4,142
Default

Sometimes we see situations like this and it occurs for a number of reasons:

A.) LRP ESC has no provision for motor thermal shut down. If your motor is running hot, the ESC will not shut down because of it.

B.) The LRP has an electronic timing advance function commonly referred to as the "Power" setting. Running this setting on very high levels such as 5-8, can cause more current draw, heating, and seems to increase the liklihood of some sort of failure especially when coupled with high gearing like most people seem to be accustomed to.

When using these timing settings it is important to use a lower gearing (smaller pinion gear) in conjunction with them due to the higher current and RPM that they induce into the motor.
__________________
Steve Weiss
TEAM ASSOCIATED -- REEDY -- SANWA -- PROTOFORM -- 1UP Racing -- ActivRC -- P1 BRAND -- TEAM KINWALD -- TEAM STEVE INTERNATIONAL
Steve Weiss is offline   Reply With Quote
Old 10-22-2008, 11:08 AM   #8
Tech Fanatic
 
dpatterson26's Avatar
 
Join Date: Aug 2007
Posts: 966
Trader Rating: 6 (100%+)
Default

Thanks for the input Steve, both Speedos are set on the default settings. I have ran this set up in the rubber car since july. Just bouth my 2nd lrp speedo and installed it two weeks ago.
__________________
eXpress Motorsports•Sweep•Lunsford Racing•ORCA•RC Plus
dpatterson26 is offline   Reply With Quote
Old 10-22-2008, 09:05 PM   #9
Tech Master
 
Drillit's Avatar
 
Join Date: Sep 2007
Location: Oreganastan Pacific Wonderland home to Indoor Farming
Posts: 1,059
Default

Glad to hear you're gettin' help on this

Gives you time to set up a J-CAR!
__________________
Mark Tilley
Got T-Bar ? ......... Oregons No ZigZag rule sucks
Bias the weight to the end you want to hit the wall with first!
Searchin fer answers in the Fog.......that's what I found
Drillit is offline   Reply With Quote
Old 10-22-2008, 11:32 PM   #10
Tech Fanatic
 
dpatterson26's Avatar
 
Join Date: Aug 2007
Posts: 966
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Drillit View Post
Glad to hear you're gettin' help on this

Gives you time to set up a J-CAR!
Do you have a speedo I could borrow?
__________________
eXpress Motorsports•Sweep•Lunsford Racing•ORCA•RC Plus
dpatterson26 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for 1/10 Electric Racers on the New Asphalt at Mikes, Houston John Stranahan Texas Racing 495 10-08-2010 04:55 PM
LRP SPHERE COMP. ESC (80700) Miu Miu Electric On-Road 725 07-08-2010 04:42 PM
COMPLETE SELL OUT-LI-POS,MOTORS,ESC's,BUGGIES,TRUCKS, ETC. 2wdMod R/C Items: For Sale/Trade 90 07-07-2009 12:29 PM
The Novak Experience Spoook Electric On-Road 52 08-06-2008 10:11 AM
The One True 13.5 Thread syndr0me Electric On-Road 713 02-02-2008 02:53 PM
Novak GTB vs. LRP Sphere TC-Spec kn7671 Electric On-Road 58 01-22-2008 02:09 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 11:43 AM.


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