R/C Tech Forums

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

Like Tree1Likes
Reply
 
Thread Tools Search this Thread
Old 12-25-2015, 02:11 PM   #1741
Tech Adept
 
Join Date: Mar 2015
Location: Switzerland
Posts: 159
Default

Hello,
I have a question that I hope you may answer, regarding my T4 2014 and its electronic.
I went practicing for the first time at a local track. Everything awesome, but, after some laps at turtle speed, my throttle died. Steering still fine, but no power whatsoever. I thought to drained battery. I switch pack, I drive few laps and dead again. Then I noticed the leds of the ESC blinking. The error code was motor overheating, but the motor was definitely cold. I run LRP flow ESC, with LRP X20 13.5T motor, in blinky mode.
After other trials, nothing... Few turns and dead throttle. A very kind guy quickly switched my ESC with his backup one (a Team Orion), with tons of timing and turbo. The car was hyperfast and I managed to finish a pack without issues. Electronic was glowing hot, though.
So, before trashing my ESC, I checked the gear ratio. I am at 76/32. I did some research and I kinda understood that, for 13.5T, that's wrong. I should change my pinion with a 26 teeth one, in order to get a ratio of 5.55:1. Actually I am at 4.51:1.

Might this be the cause of my dead throttle issue?

Thanks
RioImmagina is offline   Reply With Quote
Old 12-25-2015, 05:05 PM   #1742
Tech Regular
 
Ph3nyx's Avatar
 
Join Date: Jan 2013
Location: Nantes, France
Posts: 378
Default

did you have checked your lipo cut off ?
__________________
the first F1 RC resource in french : www.rcf1.fr
Ph3nyx is offline   Reply With Quote
Old 12-26-2015, 12:02 AM   #1743
Tech Master
 
wtcc's Avatar
 
Join Date: Jul 2010
Location: Germany
Posts: 1,245
Trader Rating: 1 (100%+)
Default

I had the exact same problem somedays ago (X20 13.5t). In the end it was the sensor unit of the motor...
Before buying a new esc I would try another sensor unit or motor or sensor cable first.
wtcc is offline   Reply With Quote
Old 12-26-2015, 12:18 AM   #1744
Tech Initiate
 
Join Date: Aug 2013
Location: France
Posts: 38
Default

same problem with my X20 10.5T Stock-spec(esc HW V3.1), it was the sensor unit.
__________________
Rally-game proto Clo-products - Toro 150a - HW 2250kv - Turnigy a-spec - Futaba 3PKS
Tamiya M03S mini cooper - Novak 410M1C - Orion Core 27x1
Kyosho Mini-Z MR03 and MA015
Xray T4-2014 - Hobbywing V3.1 - LRP X20 spec 10.5 - Turnigy ultimate
Xray X12-2014 - Reedy Mach2 6.0
christophed83 is offline   Reply With Quote
Old 12-26-2015, 12:57 AM   #1745
Tech Adept
 
Join Date: Mar 2015
Location: Switzerland
Posts: 159
Default

Thank you for the answers.
Yes, I checked the Lipo cutoff and state of charge. Both fine.
I also thought to the sensor cable. I checked with a multimeter if all the wires were conducting and it looked ok too. I have anyway a brand new Tekin cable from my 1/8 motor that should fit.
So, do you exclude a gearing issue?

Sorry, I saw that you all were referring to the sensor unit, not to the cable. I will try to find one.

Last edited by RioImmagina; 12-26-2015 at 01:09 AM. Reason: Misreading
RioImmagina is offline   Reply With Quote
Old 12-26-2015, 11:02 AM   #1746
Tech Adept
 
Join Date: Mar 2015
Location: Switzerland
Posts: 159
Default

I saw that xray offers pinions and spur gear in two different pitch... how do you recognize which one is which?
RioImmagina is offline   Reply With Quote
Old 12-26-2015, 11:32 AM   #1747
Tech Rookie
 
Join Date: Dec 2015
Posts: 19
Default

Quote:
Originally Posted by RioImmagina View Post
I saw that xray offers pinions and spur gear in two different pitch... how do you recognize which one is which?
48P and 64p
48 has larger teeth than 64. Once you see them in person it's not hard to tell.
Brianisoutside is offline   Reply With Quote
Old 12-26-2015, 11:50 AM   #1748
Tech Fanatic
 
erchn's Avatar
 
Join Date: Aug 2010
Location: Union City, CA
Posts: 817
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by RioImmagina View Post
I saw that xray offers pinions and spur gear in two different pitch... how do you recognize which one is which?
This can be useful.
http://www.ultrascale.com/node/15
erchn is offline   Reply With Quote
Old 12-26-2015, 12:56 PM   #1749
Tech Adept
 
Join Date: Mar 2015
Location: Switzerland
Posts: 159
Default

Quote:
Originally Posted by erchn View Post
This can be useful.
http://www.ultrascale.com/node/15
This is useful indeed!
Thank you
RioImmagina is offline   Reply With Quote
Old 01-10-2016, 02:06 AM   #1750
Tech Regular
 
crusty's Avatar
 
Join Date: Feb 2005
Posts: 456
Trader Rating: 6 (100%+)
Default

what screws are people taking out for flex usually? if any.
on the setup sheets it has a section - motor mount flex yes or no. if the no is ticked im gathering the screw is used
crusty is offline   Reply With Quote
Old 01-10-2016, 04:05 AM   #1751
Tech Master
 
wtcc's Avatar
 
Join Date: Jul 2010
Location: Germany
Posts: 1,245
Trader Rating: 1 (100%+)
Default

You can remove the spur gear bulkhead screws, remove the motor mount post and work with the downside motormount screws.
The I always leave last mentioned as the manual said. The motor mount post makes the car turn better, the front end then dominates (feels like the car is pulled around the corner by a string). I for myself never used the spur gear bulkhead screws.
Additionally you can get the RSD bulkhead braces. With these the car stays flatter and you also can manipulate balance and flex. I use one in front.
__________________
/// CAUTION: Rogue robot \\\
wtcc is offline   Reply With Quote
Old 01-10-2016, 05:08 AM   #1752
Tech Regular
 
crusty's Avatar
 
Join Date: Feb 2005
Posts: 456
Trader Rating: 6 (100%+)
Default

By Spur gear bulkhead screws you mean the four on top of the top deck there
Quote:
Originally Posted by wtcc View Post
You can remove the spur gear bulkhead screws, remove t[GVIDEO][/GVIDEO]he motor mount post and work with the downside motormount screws.
The I always leave last mentioned as the manual said. The motor mount post makes the car turn better, the front end then dominates (feels like the car is pulled around the corner by a string). I for myself never used the spur gear bulkhead screws.
Additionally you can get the RSD bulkhead braces. With these the car stays flatter and you also can manipulate balance and flex. I use one in front.
crusty is offline   Reply With Quote
Old 01-10-2016, 08:01 AM   #1753
Tech Fanatic
 
tbrymer's Avatar
 
Join Date: Feb 2011
Location: Arizona
Posts: 960
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by crusty View Post
By Spur gear bulkhead screws you mean the four on top of the top deck there
I'm pretty sure that's what he means. A lot of people leave all four of those screws out and prop up the top deck using 1mm shims under the top deck for all the other screws holding the top deck down.
__________________
CRC - C&C Motorsports - SpeedZone
tbrymer is offline   Reply With Quote
Old 01-16-2016, 01:23 PM   #1754
Tech Adept
 
Join Date: Jun 2004
Location: essex, england
Posts: 127
Default

Hi guys last minute question. Does anyone know if the original t4 top deck fits the 2015. I know the centre post hole won't be there but it's the 8 bulkhead screws I'm concerned with
Bony85 is offline   Reply With Quote
Old 01-16-2016, 02:05 PM   #1755
Tech Fanatic
 
daleburr's Avatar
 
Join Date: May 2010
Location: Oxfordshire, UK
Posts: 854
Default

Quote:
Originally Posted by Bony85 View Post
Hi guys last minute question. Does anyone know if the original t4 top deck fits the 2015. I know the centre post hole won't be there but it's the 8 bulkhead screws I'm concerned with
Yes it's only the centre post that won't fit, fine apart from that.
__________________
Team Xray
RC-Timing Software - http://www.rc-timing.com
Mercedes AMG F1 - http://www.mercedes-amg-f1.com/
daleburr is offline   Reply With Quote
Reply



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 09:04 AM.


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