R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 07-04-2005, 01:40 AM   #1
Tech Initiate
 
Captain Harlock's Avatar
 
Join Date: Jun 2005
Posts: 48
Default My brushless evo4 ms

Hi, I have finished building up my Evo4 ms along with a Kontronik twist-55 brushless motor and a Schulze U-Force 75 esc to support my car with decent power. What gear ratio is recommended for the car with this setup? I'm using 64p 34t pinion and 64p 96t spur which give around 6.4:1 FDR. Thanks whether you're going to reply or not.
Captain Harlock is offline   Reply With Quote
Old 07-04-2005, 02:07 AM   #2
Tech Master
 
Join Date: Aug 2001
Posts: 1,152
Default

Gearing for touring cars really depends on the track.Small track you should gear it using smaller pinons or larger spur.And vice versa for large tracks.

So what you should do is to go down to your local track and test.See whether your motor reaches peak rpm way before the end of the long straight.If is peaking before the long straight ends then you need to use a bigger pinon until the optimum gearing is found.Remember only increase your gear size by 1 at a time.

Another thing is if your motor has not enough torque in the infield then decrease the pinon size.This is the case for the motor not reaching peak rpm at the end of the long straight.

Summery:
Smaller pinon/ larger spur= faster accerleration but lower top speed.
Bigger pinon/ Smaller spur= Slower accerleration but higher top speed.

Hope this helps.

Nothings beats going down to the track for the actual track test.
Ben.C is offline   Reply With Quote
Old 07-04-2005, 08:33 AM   #3
Tech Elite
 
kufman's Avatar
 
Join Date: Feb 2004
Location: Elburn, IL
Posts: 3,428
Trader Rating: 6 (100%+)
Default

It really depends on track size. I run a TC4 with the U-force 75 and a plettenberg shadow (6000 rpm/v). I usually go by rollout when figuring gearing, that is, how far does the car roll per revolution of the motor. For large outdoor track that number is usually around 29 or 30 mm/rev. On an indoor track it is usually around 24 to 25 mm/rev. To find rollout do this

(Pi*D)/FDR

Pi=3.14159
D=Tire diameter
FDR=Final Drive Ratio

Or you can go to www.gearchart.com


So if you are running 62 mm tires on your car right now, you are geared just a little faster than I run on a large outdoor track.
__________________
Brushes? We don't need no stinking brushes!!!
kufman is offline   Reply With Quote
Old 07-04-2005, 09:03 AM   #4
Tech Initiate
 
Captain Harlock's Avatar
 
Join Date: Jun 2005
Posts: 48
Default

So how did you find your u-force 75/ shadow setup is working? pretty fast huh?
Captain Harlock is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NovaMega Evo4 3p .15 6Cuda6 R/C Items: For Sale/Trade 3 03-05-2007 03:01 PM
WTB: Pro4/Evo4 *sil80* R/C Items: Wanted to Buy 6 02-05-2006 07:27 PM
TB Evo4, 415 or Pro 4? N15M0 Electric On-Road 1 07-14-2005 07:12 AM
Ms Evo4 .21 cdelong R/C Items: For Sale/Trade 1 05-03-2005 07:13 AM
415 or evo4 Evo_Uk Electric On-Road 7 05-31-2004 09:43 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 12:06 PM.


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