R/C Tech Forums

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

Like Tree2Likes
Reply
 
Thread Tools Search this Thread
Old 03-07-2017, 04:12 AM   #1
Tech Apprentice
 
djlove85's Avatar
 
Join Date: Nov 2006
Posts: 69
Default fading

this weekend my car starts fast and starts to fade. what i'll doing wrong and how do i fix it! George. fantom 25.5 amp draw 6.4 Gearing 96/41 x 1.9 = 4.448
at 386 raceway
djlove85 is offline   Reply With Quote
Old 03-07-2017, 05:50 AM   #2
Tech Elite
 
jlfx car audio's Avatar
 
Join Date: Nov 2007
Location: jackson,tn
Posts: 3,323
Trader Rating: 36 (100%+)
Default

What battery?
What timing?
Size of track?
jlfx car audio is offline   Reply With Quote
Old 03-07-2017, 07:16 AM   #3
Tech Fanatic
 
Join Date: Nov 2004
Location: Spring Hill Tn
Posts: 789
Trader Rating: 2 (100%+)
Default

don't know what your amp draw with timing is???????? and FDR is probably way too high.you should start your FDR around 3.60s and timing around 42-46* and start from there.
freebird is offline   Reply With Quote
Old 03-07-2017, 08:07 AM   #4
Tech Addict
 
nubs's Avatar
 
Join Date: Mar 2016
Location: Tracy, CA
Posts: 530
Trader Rating: 2 (100%+)
Default

I would start before even that.. describe what you mean by fading? Fading in the same race? Fading from start of session to end of session? How hot is it outside? Do you have a fan on your ESC and your motor?
__________________
Tamiya TRF419X | Tamiya TA07 Pro | Tamiya TB04 / Exo Six | AE B5 Converted to B5M
nubs is offline   Reply With Quote
Old 03-07-2017, 08:15 AM   #5
AMZ
Tech Regular
 
AMZ's Avatar
 
Join Date: Jan 2009
Posts: 366
Trader Rating: 4 (100%+)
Default

Old batteries ?
AMZ is offline   Reply With Quote
Old 03-07-2017, 09:51 AM   #6
Tech Master
 
vivo quevas's Avatar
 
Join Date: Oct 2009
Location: Central, Ca.
Posts: 1,117
Trader Rating: 18 (100%+)
Default

Too much timing motor is over heating. Anything over 5 amps on a 25.5 motor is too much. Also motors like Team Scream are timed at 2.6amps and they are fast as heck.
__________________
Awesomatix A800 USGT, Awesomatix 800 VTA, , Tamiya Euro Truck, CRC WTF1

http://localrcracing.freeforums.org/
HobbyTown Fresno, Ca. McAllister Racing, Visa/MasterCard's
vivo quevas is offline   Reply With Quote
Old 03-07-2017, 10:05 AM   #7
Tech Apprentice
 
djlove85's Avatar
 
Join Date: Nov 2006
Posts: 69
Default

new reddy 5600 Lipo Factory 6500. temp is 137 to 141 degrees timing 54 speedo hobby wing V3 120A shot track Xray T4 2017
djlove85 is offline   Reply With Quote
Old 03-07-2017, 10:10 AM   #8
Tech Elite
 
jlfx car audio's Avatar
 
Join Date: Nov 2007
Location: jackson,tn
Posts: 3,323
Trader Rating: 36 (100%+)
Default

Quote:
Originally Posted by djlove85 View Post
new reddy 5600 Lipo Factory 6500. temp is 137 to 141 degrees timing 54 speedo hobby wing V3 120A shot track Xray T4 2017
Track size?
Timing is too high gear ratio is too high also .
How bad is it fading
jlfx car audio is offline   Reply With Quote
Old 03-07-2017, 10:17 AM   #9
Tech Master
 
vivo quevas's Avatar
 
Join Date: Oct 2009
Location: Central, Ca.
Posts: 1,117
Trader Rating: 18 (100%+)
Default

Quote:
Originally Posted by jlfx car audio View Post
Track size?
Timing is too high gear ratio is too high also .
How bad is it fading
That is a good point gearing too high or too low also is a factor in motor over heating and fade.
__________________
Awesomatix A800 USGT, Awesomatix 800 VTA, , Tamiya Euro Truck, CRC WTF1

http://localrcracing.freeforums.org/
HobbyTown Fresno, Ca. McAllister Racing, Visa/MasterCard's
vivo quevas is offline   Reply With Quote
Old 03-07-2017, 03:59 PM   #10
Tech Champion
 
Join Date: Feb 2011
Posts: 6,080
Trader Rating: 1 (100%+)
Default

Absolutely correct... Overreving is just as bad as overgearing....
bertrandsv87 is offline   Reply With Quote
Old 03-08-2017, 03:50 AM   #11
Tech Apprentice
 
djlove85's Avatar
 
Join Date: Nov 2006
Posts: 69
Default

40 x 76 track size. i set all my motors this way this only started when i got this fantom 25.5 i have use tekin novak and never had this problem thanks guys
djlove85 is offline   Reply With Quote
Old 03-08-2017, 04:03 AM   #12
Tech Elite
 
theproffesor's Avatar
 
Join Date: Feb 2005
Location: Lugoff SC
Posts: 2,726
Trader Rating: 56 (100%+)
Default

Why would you arbitrarily set all your motors this way? In all likely good you are over times and over geared. Are you running USVTA or F1? Most USVTA your final gearing is between 3.5 and 4 for most tracks and motors. And very rarely is timing more than 45 degrees on any motor from the factory. Tekin, and naval may not set the timing to a particular spot, but Motiv, Fantom, TS, and other race oriented companies set the timing at its optimum (or very close to it) spot before it gets shipped out.
__________________
Associated - Fantom - Savox - Hobbywing - Spectrum.
The brighter the picture, the darker the negative. USVTA member #112
theproffesor is offline   Reply With Quote
Old 03-08-2017, 07:25 AM   #13
Tech Master
 
vivo quevas's Avatar
 
Join Date: Oct 2009
Location: Central, Ca.
Posts: 1,117
Trader Rating: 18 (100%+)
Default

I race VTA I've run Novak, Trinity, TSR, and I have a new Fantom but I haven't raced it yet. Trinity is the only one of those motors running the timing above 50` makes a performance difference. I check actual timing most of the above mentioned motors have a sweet spot in the 45` range. Timing the motor up is over rated I went down that path for too long at great expense and fustaration. I am positive after many testing and racing days it's in the gearing. It is the spur and pinion combination I have chased my tail used my friends some of the fastest guys in Central and Northern Calif, timing and gearing recommendation. I found gearing conservatively timing conservatively made the biggest performance gains on the track. Top end speed is overrated being pulled 3 or 4 feet down the straight away is nothing but being pulled 3 or 4 feet out of every corner or even a couple of corners will get you lapped.
__________________
Awesomatix A800 USGT, Awesomatix 800 VTA, , Tamiya Euro Truck, CRC WTF1

http://localrcracing.freeforums.org/
HobbyTown Fresno, Ca. McAllister Racing, Visa/MasterCard's
vivo quevas is offline   Reply With Quote
Old 03-09-2017, 11:40 AM   #14
Tech Apprentice
 
djlove85's Avatar
 
Join Date: Nov 2006
Posts: 69
Default

i don't run vta i run 25.5 club race if don't set my motors up like this i get lap i doing 11.3 lap time and the motor come off at 123 to134 degrees i use a Gforce analyzer to set my timing to get 6 amp draw the timing is not the same on all motors just the amp draw at 6 amp look on you tube under Gforce thanks
djlove85 is offline   Reply With Quote
Old 03-09-2017, 12:18 PM   #15
Tech Addict
 
nubs's Avatar
 
Join Date: Mar 2016
Location: Tracy, CA
Posts: 530
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by djlove85 View Post
i don't run vta i run 25.5 club race if don't set my motors up like this i get lap i doing 11.3 lap time and the motor come off at 123 to134 degrees i use a Gforce analyzer to set my timing to get 6 amp draw the timing is not the same on all motors just the amp draw at 6 amp look on you tube under Gforce thanks
I think you are referring to the video by Nick Adams. One thing to note about that video is that he is referring to 17.5 and 13.5 motors. Not sure if that makes a difference but I would assume it does.
__________________
Tamiya TRF419X | Tamiya TA07 Pro | Tamiya TB04 / Exo Six | AE B5 Converted to B5M
nubs is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
vector fade / fading dots? mourinho Painting, Designs, Graphics and Photography 7 08-21-2013 04:57 AM
Reedy 767 brushes---> fade? Qwiglee Electric On-Road 18 08-31-2004 11:16 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 01:22 AM.


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