R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-07-2009, 04:13 AM   #1
Tech Addict
 
Join Date: Nov 2008
Location: NZ
Posts: 677
Default fdr for RZ & silver can motors: a few questions

Hi there.
Whats a recommended FDR for Tamiya RZ (23t) & 27T silver can motors
Cars are Ta05 & TA05-ifsR
I'm guessing the TZ is 5.3(the box is in Japanese)
Searching a few forums suggests 4.0 for the silvercan
Are ratio's these about right for a starting point??
I know that straining the motor from is bad for it, what about having it
under-geared: will it over rev and damage the motor

Do the higher turn motors need higher or lower gear ratio's?

Thanks
1101 is offline   Reply With Quote
Old 04-07-2009, 08:59 AM   #2
Tech Fanatic
 
94eg!'s Avatar
 
Join Date: Jan 2008
Posts: 832
Trader Rating: 17 (100%+)
Default

Undergearing won't damage the motor as it won't over-rev. The motors known to over-rev are some super-high-power low-turn brushless (3.5T). The only down side to undergearing is you will loose top speed...
94eg! is offline   Reply With Quote
Old 04-07-2009, 09:06 AM   #3
Tech Champion
 
asw7576's Avatar
 
Join Date: Sep 2004
Posts: 5,792
Default

Quote:
Originally Posted by 1101 View Post
Hi there.
Whats a recommended FDR for Tamiya RZ (23t) & 27T silver can motors
Cars are Ta05 & TA05-ifsR
I'm guessing the TZ is 5.3(the box is in Japanese)
Searching a few forums suggests 4.0 for the silvercan
Are ratio's these about right for a starting point??
I know that straining the motor from is bad for it, what about having it
under-geared: will it over rev and damage the motor

Do the higher turn motors need higher or lower gear ratio's?

Thanks

Tamiya RZ manual recommends 7.0 - 6.5 FDR.

I already try it as low as 5.5 ..... but I play safe at 5.75. I use silver trinity brush ( expensive brush ). No burns on the comm after 8 minutes run.

I don't know the max FDR for silver can.

High turn motor needs low and lower FDR. ex. 27T stock motor is preferable with 4 - 4.5 FDR.

Low turn motor needs high and higher FDR. ex. 7T modified motor is preferable with 8 - 8.5 FDR.

Over geared motor, ex. 7T modified motor with 6.5 FDR, the motor winding mostly will blow up ( burnt ), or the comm will be burnt, notice the purple or black marks on the comm and brushes.

Under geared motor, the motor will kind of over rev, but it won't go broke or damage ..... It's just your car will be slower than the rest.

Tips : Hard springs and Silver Brushes.
__________________
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus
asw7576 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 02:36 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