R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 09-01-2001, 01:06 AM   #1
Tech Master
 
TRF-Powered's Avatar
 
Join Date: Aug 2001
Posts: 1,003
Default general gear ratio question

hi, I know that when the gear ratio is small higher top speed is achieved. When gear ratio is big more initial speed is achieved. So how do i know that what kinda gearing is too high or too low for my P2K? should I gear it low? since it's more toruqy motor? I am running a TB-Evo now
TRF-Powered is offline   Reply With Quote
Old 09-01-2001, 08:29 AM   #2
Tech Fanatic
 
Join Date: Aug 2001
Location: Washington state
Posts: 962
Default

Your car should have come with gear ratio suggestions from Tamiya. Try them out first and track your run time and how hot the motor gets.
coolrcdad is offline   Reply With Quote
Old 06-08-2014, 08:25 PM   #3
Tech Adept
 
RaceDayHobbies's Avatar
 
Join Date: Oct 2013
Posts: 188
Default

Gear ratio is calculated by: spur gear/pinion gear. So a bigger number means you will have quicker acceleration and slower top speed. Smaller number means you will have slower acceleration but higher top speed. The way to determine if you are geared too tall is by motor temperature. The more load you put on the motor by trying to achieve higher top speed the hotter the motor will run. If your motor is running to hot, drop your pinion gear by a tooth and check it again.
__________________
http://racedayhobbies.com/
RaceDayHobbies is offline   Reply With Quote
Old 06-09-2014, 05:05 AM   #4
Tech Adept
 
Clawhammers's Avatar
 
Join Date: Apr 2014
Posts: 192
Default

is there any reference formula in calculating how tall you can go with gearing ??
Clawhammers is offline   Reply With Quote
Old 06-09-2014, 05:23 AM   #5
Tech Master
 
Join Date: Jun 2008
Location: santa monica / manchester
Posts: 1,273
Default

Quote:
Originally Posted by Clawhammers View Post
is there any reference formula in calculating how tall you can go with gearing ??
It's more physically how much room you have to fit your pinion / spur combo in the car and make a clean mesh.

Racing blinky you can go from low 3's to 6 depending on track size and conditions.

Just go with a ball park that others use and tune from there checking your motor heat.
__________________
http://www.theRcRacer.com/

TRF419, TBEvo6, TT02, VDF, TRF501x, TRF201, TRF101, Mi5, X-Ray T4-13, BD7 2014, A700 Evo, WR-02G
Qatmix is offline   Reply With Quote
Old 06-09-2014, 05:27 AM   #6
Tech Elite
 
Join Date: Jul 2010
Posts: 2,307
Trader Rating: 9 (100%+)
Default

This motor is an older "stock" brushed motor, yes? So circa 27t or so?

Quote:
Originally Posted by Clawhammers View Post
is there any reference formula in calculating how tall you can go with gearing ??
Most manufacturers will give FDR recommendations for their motors.

In the absence of that, this guide from Novak is a good start. Well, for brushless anyway.
cplus is offline   Reply With Quote
Old 06-09-2014, 06:07 AM   #7
Tech Fanatic
 
d16dcoe45's Avatar
 
Join Date: Oct 2007
Location: Armonk, NY
Posts: 947
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by cplus View Post
This motor is an older "stock" brushed motor, yes? So circa 27t or so?



Most manufacturers will give FDR recommendations for their motors.

In the absence of that, this guide from Novak is a good start. Well, for brushless anyway.
You are referring to the motor the OP asked about in a post 13 YEARS AGO? My guess is he probably figured out his gearing questions by looking them up on Altavista.com, with his 56k modem which he probably bought at Caldor's, travelling there is his brand new Saturn or Pontiac.
__________________
Jay Lestingi

Tamiya 419x/Associated TC7.1/Sanwa M12s/Xpert servos
d16dcoe45 is offline   Reply With Quote
Old 06-09-2014, 06:08 AM   #8
Tech Adept
 
Clawhammers's Avatar
 
Join Date: Apr 2014
Posts: 192
Default

Quote:
Originally Posted by Qatmix View Post
It's more physically how much room you have to fit your pinion / spur combo in the car and make a clean mesh.

Racing blinky you can go from low 3's to 6 depending on track size and conditions.

Just go with a ball park that others use and tune from there checking your motor heat.


Quote:
Originally Posted by cplus View Post
Most manufacturers will give FDR recommendations for their motors.

In the absence of that, this guide from Novak is a good start. Well, for brushless anyway.

@Qatmix and @Cplus


I see. Thanks a lot for your kind explanation.

It's a massive help for me.
Clawhammers is offline   Reply With Quote
Old 06-09-2014, 07:14 AM   #9
Tech Elite
 
Join Date: Jul 2010
Posts: 2,307
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by d16dcoe45 View Post
You are referring to the motor the OP asked about in a post 13 YEARS AGO? My guess is he probably figured out his gearing questions by looking them up on Altavista.com, with his 56k modem which he probably bought at Caldor's, travelling there is his brand new Saturn or Pontiac.
Oops!

I'm not the one that dug the thread up though!
cplus is offline   Reply With Quote
Old 06-09-2014, 07:40 AM   #10
Tech Fanatic
 
d16dcoe45's Avatar
 
Join Date: Oct 2007
Location: Armonk, NY
Posts: 947
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by cplus View Post
Oops!

I'm not the one that dug the thread up though!
no worries, I know you didn't bring it back to life. Its just the oldest thread that I've seen dug up on any site.
__________________
Jay Lestingi

Tamiya 419x/Associated TC7.1/Sanwa M12s/Xpert servos
d16dcoe45 is offline   Reply With Quote
Old 06-09-2014, 12:32 PM   #11
Suspended
 
Join Date: Feb 2011
Posts: 6,240
Trader Rating: 1 (100%+)
Talking

To really answer the OP, you can gear the P2K motor anywhere from 5.8fdr to 6.2fdr , but it will only compete with brushless on a super tight carpet track... You will need the best fan possible, and time your run to 6Minutes only....
bertrandsv87 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gear Ratio Question. srp67 Electric On-Road 5 07-12-2008 11:39 AM
Gear ratio question! Horth Racing Electric On-Road 2 02-10-2008 08:35 AM
truggy spur gear question???and general truggy conversion.question. downunder23 Electric Off-Road 1 03-22-2007 09:09 PM
gear ratio PoLsKiE Electric On-Road 4 01-17-2007 04:42 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 01:58 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