R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 08-13-2005, 10:35 AM   #1
Tech Master
 
DustinR's Avatar
 
Join Date: Sep 2004
Location: C-Bus in the OH10
Posts: 1,566
Trader Rating: 10 (100%+)
Default Gearing for Dummies. [HELP]

OK I have a HPI Pro 2 and a Losi XXX-S G+. I am wanting to get the final rollout on both of the cars to 112-115. Can anyone help me.

On my XXX-S I am running a 128 64 pitch spur.
On my Pro 2 I am running a 87 48 pitch spur.

I am running rubber tires that are 63mm in diamiter on both cars. I do not know the internal ratios of either car.

I do not want just an answer like run a 28 pinion altough that is also needed. I would like someone to explain how they came to their answer.

Thanks so much for any and all help. I plan to race these cars tomorrow.
__________________
Grandview Hobbies, HobbyWing, J-Concepts, Airtronics, LukeDawg Graphics, TQ Wire
DustinR is offline   Reply With Quote
Old 08-13-2005, 10:47 AM   #2
Tech Elite
 
Join Date: Nov 2002
Location: CORONA , CALIF.
Posts: 4,053
Trader Rating: 1 (100%+)
Default

try here www.gearchart.com ... you can calulate roll out youll need but you will need to enter your final for both cars as well ...
__________________
Mark Barden .
mb racer is offline   Reply With Quote
Old 08-13-2005, 11:04 AM   #3
Tech Master
 
Rob Phillips's Avatar
 
Join Date: Nov 2004
Location: Indianapolis / VA
Posts: 1,722
Trader Rating: 6 (100%+)
Default

You will need the following info to figure out your FDR or rollout

-what class/motor
-what is the track size
-is it tight or open layout

When I used to run a xxx-s on carpet w/foams I ran something like a 33/128 for stock. your tires ar a little bigger than my foams so you would proably want to gear it something like a 31 tooth pinion. this was on a tight layout and about a 90 foot straight.
use gearchart.com to find the internal ratio's and compute your rollout. I think you should be able to find out what to run when you get to the track. Just ask one of the fast guys, they should be able to help you or point you in the right direction.
__________________
Team Durango | TrakPower | DE Racing | Futaba | Restricted Paint Worx

Velocity R/C Magazine - vrcmag.com
Rob Phillips is offline   Reply With Quote
Old 08-13-2005, 12:27 PM   #4
Tech Master
 
DustinR's Avatar
 
Join Date: Sep 2004
Location: C-Bus in the OH10
Posts: 1,566
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by mb racer
try here www.gearchart.com ... you can calulate roll out youll need but you will need to enter your final for both cars as well ...
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
__________________
Grandview Hobbies, HobbyWing, J-Concepts, Airtronics, LukeDawg Graphics, TQ Wire
DustinR is offline   Reply With Quote
Old 08-13-2005, 12:47 PM   #5
Tech Master
 
Join Date: Dec 2001
Location: Arizona
Posts: 1,197
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by DustinR
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
There is no difference, Final Drive Ratio is the same regardless of 64 or 48 pitch. Only difference is the drive ratio of the transmission.
pops is offline   Reply With Quote
Old 08-13-2005, 02:10 PM   #6
Tech Elite
 
Join Date: Nov 2002
Location: CORONA , CALIF.
Posts: 4,053
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by DustinR
Ok, But now I have a question. I went to www.gearchart.com and entered the gearing. Worked cool but I wonder about the pitch. I run 64 pitch in xxxs and 48 pitch in pro 2. When I enter it in the chart I do not see a difference. Does someone have an idea of how to combat this.
just enter the info. and your done .. as said before there's no diffrence and gear charts program will have you dialed in ... 64 or 48 pitch ..
__________________
Mark Barden .
mb racer is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Set ups for Dummies sosidge Electric On-Road 2 11-21-2007 09:54 AM
tc4 for dummies bignotch Rookie Zone 2 01-25-2006 03:07 PM
painting for dummies pigpen22 Painting, Designs, Graphics and Photography 5 12-29-2004 05:18 AM
gearing for dummies pls help cox Electric On-Road 5 08-27-2003 08:16 PM
Painting for Dummies Round_Guy Painting, Designs, Graphics and Photography 2 07-13-2003 10:34 AM



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 07:59 AM.


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