R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 07-12-2008, 05:18 PM   #1
Tech Elite
 
Join Date: Feb 2008
Location: Upper Milwaukee
Posts: 2,731
Trader Rating: 23 (100%+)
Default 13.5 gearing

so i have a sedan that currently has a stock motor (27t) in it. when i opened my package that my novak 13.5 was in i noticed it said "gear 1-2 pinion teeth lower than a 27t motor" would this be correct in my situation. also im in the process of buying an esc for the car, what do you recomend?

btw...400th post!
__________________
Mike Adamec
TEAM HACK-HACK OR BE HACKED
Trackside Hobbies
not home is offline   Reply With Quote
Old 07-12-2008, 05:25 PM   #2
Tech Champion
 
skypilot's Avatar
 
Join Date: Mar 2007
Posts: 9,524
Trader Rating: 14 (100%+)
Default

assuming your gearing your brushed stock around 6.8 to 7.2...

IMO each motor has a gear where it runs best, period, big track, small track all the same gearing start around a 5.0 go down from there depending on performance and heat.
__________________
semi retired..
skypilot is offline   Reply With Quote
Old 07-12-2008, 05:27 PM   #3
Tech Elite
 
a_main_attendee's Avatar
 
Join Date: Jan 2008
Location: Colorado, USA, The land of the free and the home of the brave!
Posts: 2,880
Trader Rating: 2 (100%+)
Default

If it's a sintered rotor, you should be gearing around the 4.5 range in terms of FDR. To me 1-2 teeth less sounds like the car would be WWWAAAAYYYY undergeared. It depends though, what is the car it is being used in, the power source (i.e. nimh or lipo) and what you want the car to do. Undergearing it won't hurt that much, but if its too far undergeared it may damage the motor. Just gear the car and then drive the car, and don't take the motor temp above 170.

But if you can, start at about a 5.0 fdr and see if it feels undergeared. if it needs more, add more, but watch the temp.

A good cheap ESC would be the novak XBR or even the losi Xcelorin sensored. Good luck.
__________________
Support your local tracks!--|--e-teamhobbyplex.com--|--corrc.org--|

NNFaN Paints - Add some pride to YOUR ride.
a_main_attendee is offline   Reply With Quote
Old 07-12-2008, 05:32 PM   #4
Tech Master
 
yokemad's Avatar
 
Join Date: Apr 2007
Posts: 1,150
Default

Please be careful cos overheated brushless motor winds can melt and that means the end of story!!!
yokemad is offline   Reply With Quote
Old 07-12-2008, 06:21 PM   #5
Tech Elite
 
Join Date: Feb 2008
Location: Upper Milwaukee
Posts: 2,731
Trader Rating: 23 (100%+)
Default

now i know nothing about gearing at all i have absolutly no clue about how to find the correct pinions for the motors. i currently have a 48 pitch 84t spur with a 25t pinion for my 27t. so what pinion size should i aim for. all the help is appreciated!
__________________
Mike Adamec
TEAM HACK-HACK OR BE HACKED
Trackside Hobbies
not home is offline   Reply With Quote
Old 07-12-2008, 06:35 PM   #6
Tech Master
 
shadow102's Avatar
 
Join Date: Feb 2008
Posts: 1,441
Trader Rating: 21 (96%+)
Default

What kind of of car is it?
__________________
Hot Bodies Cyclone - - TeamTekin - - Spektrum - - Team Orion - - Futaba

www.nexusracing.com
www.go-rc.org
shadow102 is offline   Reply With Quote
Old 07-12-2008, 06:45 PM   #7
Tech Elite
 
Join Date: Feb 2008
Location: Upper Milwaukee
Posts: 2,731
Trader Rating: 23 (100%+)
Default

Quote:
Originally Posted by shadow102 View Post
What kind of of car is it?
its a tamiya ta05ms, and i lost the manual for it just if you might have wanted to know guys
__________________
Mike Adamec
TEAM HACK-HACK OR BE HACKED
Trackside Hobbies
not home is offline   Reply With Quote
Old 07-12-2008, 06:58 PM   #8
Tech Master
 
shadow102's Avatar
 
Join Date: Feb 2008
Posts: 1,441
Trader Rating: 21 (96%+)
Default

Since i am not real familiar with 48pitch gearing i am not sure what gears to suggest. If you switch to 64 pitch a 96t spur and 48t pinion will put you at 4.5 FDR on the nose

BTW assuming you have the same trans ratio as a regular TA05 your car ratio is 2.25
__________________
Hot Bodies Cyclone - - TeamTekin - - Spektrum - - Team Orion - - Futaba

www.nexusracing.com
www.go-rc.org
shadow102 is offline   Reply With Quote
Old 07-12-2008, 07:17 PM   #9
Tech Champion
 
skypilot's Avatar
 
Join Date: Mar 2007
Posts: 9,524
Trader Rating: 14 (100%+)
Default

go to your hobby shop/race track where you bought the motor and ask them to help you,

or www.gearchart.com easy to navigate and find what your looking for
__________________
semi retired..
skypilot is offline   Reply With Quote
Old 07-12-2008, 08:14 PM   #10
Super Moderator
 
Grizzbob's Avatar
 
Join Date: Feb 2002
Location: Sand Springs, OK
Posts: 3,063
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by not home View Post
now i know nothing about gearing at all i have absolutly no clue about how to find the correct pinions for the motors. i currently have a 48 pitch 84t spur with a 25t pinion for my 27t. so what pinion size should i aim for. all the help is appreciated!
I'm also not sure what your outdrive ratio is(though it could be 2.25, the way to verify it is find out how many teeth you have on the diff pulleys & divide that by the number of teeth of the center pulley{which could be 36t diff pulley / 16t center, = 2.25}), but if what I mentioned is it, then you just take the number of spur teeth, divide it by the number of pinion teeth, & multiply it by the outdrive ratio. So say if you have a 72 tooth spur, if you use a 32 tooth pinion then you'll get a final drive ratio of about 5.06(72/32x2.25=5.06), & for some tracks that may get you in the ballpark....BTW, do you race at S & N's Trackside Hobbies? If so, then I'd gear taller than that, maybe try a final drive of about 4.6(that's around what I've run there for the Novak Race with a 13.5 motor)....
__________________
Bob Seay
Tamiya TRF417, TA05v.2, TRF211XM, M-05ver.2R, XRAY X12, Associated B5m Factory Lite

Go Pokes!!!

Last edited by Grizzbob; 07-12-2008 at 08:21 PM. Reason: corrections
Grizzbob is offline   Reply With Quote
Old 07-12-2008, 10:53 PM   #11
Tech Elite
 
Join Date: Feb 2008
Location: Upper Milwaukee
Posts: 2,731
Trader Rating: 23 (100%+)
Default

Quote:
Originally Posted by Grizzbob View Post
I'm also not sure what your outdrive ratio is(though it could be 2.25, the way to verify it is find out how many teeth you have on the diff pulleys & divide that by the number of teeth of the center pulley{which could be 36t diff pulley / 16t center, = 2.25}), but if what I mentioned is it, then you just take the number of spur teeth, divide it by the number of pinion teeth, & multiply it by the outdrive ratio. So say if you have a 72 tooth spur, if you use a 32 tooth pinion then you'll get a final drive ratio of about 5.06(72/32x2.25=5.06), & for some tracks that may get you in the ballpark....BTW, do you race at S & N's Trackside Hobbies? If so, then I'd gear taller than that, maybe try a final drive of about 4.6(that's around what I've run there for the Novak Race with a 13.5 motor)....
yah im from trackside
__________________
Mike Adamec
TEAM HACK-HACK OR BE HACKED
Trackside Hobbies
not home is offline   Reply With Quote
Old 07-13-2008, 11:50 AM   #12
Super Moderator
 
Grizzbob's Avatar
 
Join Date: Feb 2002
Location: Sand Springs, OK
Posts: 3,063
Trader Rating: 2 (100%+)
Default

Kinda thought you might be, in that case start with an FDR of about 4.6, & you might even need to go taller(for the Novak Race, many of us have gone as tall as 3.9 on that track, the backstraight & sweeper & generally sweeping nature of Scotty's layouts make it easier to gear it tall).....
__________________
Bob Seay
Tamiya TRF417, TA05v.2, TRF211XM, M-05ver.2R, XRAY X12, Associated B5m Factory Lite

Go Pokes!!!
Grizzbob is offline   Reply With Quote
Old 07-13-2008, 12:27 PM   #13
Tech Elite
 
Join Date: Feb 2008
Location: Upper Milwaukee
Posts: 2,731
Trader Rating: 23 (100%+)
Default

yah, scotty said i should start somewhere around 4.5 ish and work with it there. he said i should lower my spur to 69 and like a 33 pinion he guessed.
__________________
Mike Adamec
TEAM HACK-HACK OR BE HACKED
Trackside Hobbies
not home is offline   Reply With Quote
Old 07-13-2008, 01:47 PM   #14
Tech Addict
 
Join Date: Apr 2007
Location: las vegas, nv
Posts: 554
Trader Rating: 30 (100%+)
Default

This may be a stupid question, but what is the difference if I were to run a 69 spur and a 33 pinion or a 73 spur and a 35 pinion? The reason I ask is because they both end up around a 4.18 on my tc5? Is there a difference?
chuckharrisjr is offline   Reply With Quote
Old 07-13-2008, 01:50 PM   #15
Suspended
 
Join Date: Jun 2008
Posts: 592
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by chuckharrisjr View Post
This may be a stupid question, but what is the difference if I were to run a 69 spur and a 33 pinion or a 73 spur and a 35 pinion? The reason I ask is because they both end up around a 4.18 on my tc5? Is there a difference?
Larger spur = quicker initial acceleration
same final gear ratio = same top speed
rocket-mtrsprts is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gearing lickashotblaow Electric On-Road 0 07-29-2007 05:47 PM
NeeD Help with gearing please daver1 Electric On-Road 4 07-20-2007 09:12 AM
Gearing for TT-01 tl-01-jhb Rookie Zone 0 11-10-2004 05:35 AM
Need help gearing a TC3 fasda1 Electric On-Road 10 11-06-2004 11:51 AM
Gearing??? mike m Monster Trucks 3 01-24-2004 07:54 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 08:52 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