R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-19-2004, 10:31 PM   #1
Tech Adept
 
Join Date: Feb 2004
Location: Des Moines Ia
Posts: 101
Default diff lessons

Help? ? new to 1/10 touring. I have a Mugen car, been running the 1/8 scale car for a long time. My 1/8 scale car has a rear spool. Pin the trigger, the rear will follow the front through.
What do I do with the rear diff? 100,000 lock it up or 3000 and let it work. with the rear locked, pin it or do I run 3000 and roll it ?
How does the different weights of diff grease effect the handling of the car, lose ,tight ,push, on power stearing, turn in.
I will be running the car on a treated surface. HAYWYRE
haywyre is offline   Reply With Quote
Old 04-19-2004, 10:38 PM   #2
Tech Adept
 
Join Date: Mar 2002
Location: San Fernando Valley, CA
Posts: 161
Send a message via AIM to ChrisF
Default

I guess this one is a matter of chassis tuning, track condition and personal preference.

If you want your sedan to handle like an 1/8th scale, my guess is a tight rear diff would be in order. A locked diff? Maybe not. It would be pretty hard to drive on all but a super sticky, smooth track.

I think most folks are running somewhere in between 30,000 - 250,000 grease. I suggest starting with 100,000 and playing with setup of the car.

This is one of the reasons I decided to pickup a Serpent 710: 2.5mm hex changes from 30,000 - solid with a few turns
ChrisF is offline   Reply With Quote
Old 04-20-2004, 12:29 AM   #3
rjl
Tech Fanatic
 
rjl's Avatar
 
Join Date: Jun 2002
Location: OZ
Posts: 848
Default

Touring bodies don't have the down force to allow the use of a solid axle on all but very high bite tracks, even then the car will shimmy through high speed corners and don't tend to give the fastest lap times. On smaller tracks try 10-30,000, on larger tracks go harder. This is just a generalization and you will need to test.
rjl is offline   Reply With Quote
Old 04-20-2004, 02:24 AM   #4
Tech Addict
 
Join Date: Aug 2002
Location: Australia, wollongong
Posts: 740
Send a message via ICQ to V-One S
Default

I believe it goes this way...
Lock the front, and rear open, it will want to under steer, but accelerate in a straight line pretty good...
Open front and lock the rear, it will slide the rear out (over steer) when trying to put the power down, and even just coasting through corners... but SHOULD accelerate very well in a straight line...
But a friend had his setup the second way, it was a matter of full throttle, even in a straight line and it stepped out majorly... (front diff would just break traction...

So its a matter of getting them evenly balance...
V-One S is offline   Reply With Quote
Old 04-20-2004, 01:41 PM   #5
Tech Master
 
drfritz's Avatar
 
Join Date: Sep 2001
Location: Vancouver Wa usa
Posts: 1,769
Default

Or try running the same wieght in both front and rear diffs, was running 30000 in the evo on a med size med grip track ad the car felt very nuetral.
drfritz is offline   Reply With Quote
Old 04-20-2004, 01:46 PM   #6
Tech Master
 
eddiethefish's Avatar
 
Join Date: Jun 2002
Location: Montebello, California
Posts: 1,658
Send a message via ICQ to eddiethefish
Default

Quote:
Originally posted by rjl
...On smaller tracks try 10-30,000, on larger tracks go harder. This is just a generalization and you will need to test.
well said.
eddiethefish is offline   Reply With Quote
Old 04-20-2004, 04:45 PM   #7
Tech Adept
 
Join Date: Feb 2004
Location: Des Moines Ia
Posts: 101
Default

Do any of you racers run a size difference between front and rear 3,4,5mm? HAYWYRE
haywyre is offline   Reply With Quote
Old 04-20-2004, 05:23 PM   #8
Tech Elite
 
Tabushi's Avatar
 
Join Date: Feb 2003
Location: Chile - Southamerica
Posts: 3,029
Trader Rating: 1 (100%+)
Send a message via AIM to Tabushi Send a message via Yahoo to Tabushi
Default

My usuals setups right now are ...

- Full solids
- Front solids rear 30.000 diff
- Front 100.000 diff rear 30.000 diff

And all work great !
__________________
Patricio "PATO" Concha

E-Mail : [email protected]
Facebook : http://www.facebook.com/patoconcha
Whatsapp : +56 9 66165085
Tabushi is offline   Reply With Quote
Old 04-20-2004, 06:54 PM   #9
Tech Adept
 
Join Date: Mar 2002
Location: San Fernando Valley, CA
Posts: 161
Send a message via AIM to ChrisF
Default

Most sedan racers only use a split as a function of disproportionate tire wear (rears wearing faster). I did read on this forum about someone changing the internal ratio to allow the use of larger rears without overdriving the car.

I believe as a general rule though, most sedan drivers only use a small split (.5-1.5mm) to account for tire wear on a long main. Ideally though, you try to setup the car with same or similar shore tires so that you get even wear.
ChrisF is offline   Reply With Quote
Old 04-20-2004, 07:13 PM   #10
Tech Fanatic
 
Join Date: Jan 2003
Location: Melbourne, FL
Posts: 787
Trader Rating: 2 (100%+)
Send a message via AIM to kreidel
Default

Quote:
Originally posted by Tabushi
My usuals setups right now are ...

- Full solids
- Front solids rear 30.000 diff
- Front 100.000 diff rear 30.000 diff

And all work great !
What size are the tracks you run at? Are they large or more technical?
kreidel is offline   Reply With Quote
Old 04-20-2004, 07:15 PM   #11
Tech Adept
 
Join Date: Mar 2002
Location: San Fernando Valley, CA
Posts: 161
Send a message via AIM to ChrisF
Default

haywyre:

Can you clarify if your sedan has either a front diff or one-way? That would make a difference in recommended setup.
ChrisF is offline   Reply With Quote
Old 04-20-2004, 09:15 PM   #12
Tech Adept
 
Join Date: Feb 2004
Location: Des Moines Ia
Posts: 101
Default

We run mostly large tracks, the smallest being Fastlane Hobbies in KC , its about 130x60,some tracks can get can get as big as 200x120. I am running a one way in the front. The tracks are fast and the boards are hard. the key to this Heart of America racing is to be able to adapt to different tracks in different Cities. that is why I am trying to garner as much info as I can. HAYWYRE
haywyre is offline   Reply With Quote
Old 04-20-2004, 09:21 PM   #13
rjl
Tech Fanatic
 
rjl's Avatar
 
Join Date: Jun 2002
Location: OZ
Posts: 848
Default

Tyre diameters depend on front to rear drive bias, if 1:1 the sizing is determined by wear rate. I true my fronts so that I have slight overdrive at the end of the race, usually.
rjl is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
5-cell: Lessons, Experiences, Tips, Issues, Questions adamge Electric On-Road 70 12-01-2007 08:42 PM
[B]Fioroni Center Diff And Front Diff And Ofna Torsion Diff For Hyper 7[/B] Imdadundada7 R/C Items: For Sale/Trade 22 08-07-2006 11:11 PM
RC wife lessons for racers RCwife Northwest Racers 11 02-14-2006 08:50 PM
Learned a few lessons! Varhalla Electric Off-Road 3 01-07-2006 09:32 PM
R/C Driving lessons by Jeff Cuffs John Tag R/C Items: For Sale/Trade 13 09-02-2004 09:51 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 06:22 PM.


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