R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 02-22-2010, 10:40 AM   #121
Tech Adept
 
Join Date: Feb 2009
Location: South Jersey -- Exit 4
Posts: 232
Trader Rating: 1 (100%+)
Default Too much grip

Traction roll is almost always due to too much front grip, but that in itself is a complicated issue. Stiffening up the front is a good solution, as is using a roll bar up front. Less rear droop will limit some weight transfer under braking. Going with no front kickup would be another suggestion. Trail braking only makes it worse, so straight line brakes and neutral or positive throttle in the turn will lessen the tendency. Increasing the front track width may also help.

And there's always outrigger wheels.
jhberger is offline   Reply With Quote
Old 02-22-2010, 10:54 AM   #122
Tech Legend
 
Cain's Avatar
 
Join Date: May 2002
Location: West Fargo, North Dakota
Posts: 29,537
Trader Rating: 240 (100%+)
Default

yeah, I can't change the tires since is USVTA rules.

And the grip I can get on the tires is ALOT
__________________
Member - Red River Radio/Control Car Club
< Tekno EB48SL / SCT410.3 | Tekno EB410 x 2 | Yokomo YZ-2 DTM x 2 | LC Racing EMB-1 Buggies and Truggies >
Cain is offline   Reply With Quote
Old 02-22-2010, 03:55 PM   #123
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

Quote:
Originally Posted by Cain View Post
yeah, I can't change the tires since is USVTA rules.

And the grip I can get on the tires is ALOT
Try a new set, not a different tyre.
sosidge is offline   Reply With Quote
Old 02-22-2010, 04:02 PM   #124
Tech Regular
 
Join Date: Sep 2002
Location: Parts Unknown
Posts: 271
Default

Try to just clean the tires with lighter fluid and let dry -just a thought as it worked for me
dmowery is offline   Reply With Quote
Old 02-22-2010, 08:10 PM   #125
Tech Fanatic
 
Join Date: Oct 2005
Location: Illinois
Posts: 906
Trader Rating: 16 (100%+)
Default

Try lowering the inner upper camber link and you could try to lengthen it also.
__________________
www.TheRcShack.com
www.TeamXray.com
Spdjunky is offline   Reply With Quote
Old 02-24-2010, 08:22 AM   #126
Tech Legend
 
Cain's Avatar
 
Join Date: May 2002
Location: West Fargo, North Dakota
Posts: 29,537
Trader Rating: 240 (100%+)
Default

I tried that initially in the rear, lower the camber link and lengthening it as much as possible. This time when reading that free setup book that xray has, I went the other way to affect roll center and it seemed to really help.

I am thinking of trying the setup I have now with the sway bar in the front, or, stiffening it up a bit, just need to find stiffer springs than what I have now.

As last race I basically now just have a bit of rear wheel lift. when it was really bad, I got pretty good at either dropping it out of a flip, or, doing 2wheel motion.
__________________
Member - Red River Radio/Control Car Club
< Tekno EB48SL / SCT410.3 | Tekno EB410 x 2 | Yokomo YZ-2 DTM x 2 | LC Racing EMB-1 Buggies and Truggies >
Cain is offline   Reply With Quote
Old 02-24-2010, 08:30 AM   #127
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,882
Trader Rating: 48 (100%+)
Default

Actually Cain from my experience you should soften the suspension and try to set the car up with chassis roll. The reason it traction rolls, my theory anyway, is that the car is too stiff and instead of allowing the suspension to soak up some of the body roll it just tumbles over. I have mine set on the softer side and to allow chassis roll and it worked well when I ran it. Yours wanted to roll over everytime you turned the wheel. It was almost painful to watch.
__________________
Jon Carlson
Team Associated, Reedy
Futaba, OS Engines, O'Donnell Racing Fuel
Jon Carlson is offline   Reply With Quote
Old 02-24-2010, 08:37 AM   #128
Tech Legend
 
Cain's Avatar
 
Join Date: May 2002
Location: West Fargo, North Dakota
Posts: 29,537
Trader Rating: 240 (100%+)
Default

At this point not sure. I had it setup softer during the day than at the start, and it rolled over easier than in the main which I stiffened things up.

Thinking of looking at VTA TC3 setup sheet to compare common areas between the two and start from there. Can't be any worse I am thinking.
__________________
Member - Red River Radio/Control Car Club
< Tekno EB48SL / SCT410.3 | Tekno EB410 x 2 | Yokomo YZ-2 DTM x 2 | LC Racing EMB-1 Buggies and Truggies >

Last edited by Cain; 02-24-2010 at 08:47 AM.
Cain is offline   Reply With Quote
Old 02-24-2010, 08:40 AM   #129
Regional Moderator
 
Jon Carlson's Avatar
 
Join Date: Jun 2002
Location: North Dakota
Posts: 2,882
Trader Rating: 48 (100%+)
Default

You are looking for a setup sheet or a car? I'm selling my TC4 that I was running VTA with.

I just read some more of the posts here, another important thing is droop and ride height. Taking away some of the droop might help too.
__________________
Jon Carlson
Team Associated, Reedy
Futaba, OS Engines, O'Donnell Racing Fuel
Jon Carlson is offline   Reply With Quote
Old 02-24-2010, 08:47 AM   #130
Tech Legend
 
Cain's Avatar
 
Join Date: May 2002
Location: West Fargo, North Dakota
Posts: 29,537
Trader Rating: 240 (100%+)
Default

updated my post to clarify.

Thanks for the heads up on droop. Funny thing is seems the tire switch I made is really causing some differences. Before I got it down to where it wouldn't traction roll, but the rear if I pushed it REALLY hard would kick out slightly, but the car was great. no traction rolls. Now, with the new tires they seem to be stickier, so up and over I go.
__________________
Member - Red River Radio/Control Car Club
< Tekno EB48SL / SCT410.3 | Tekno EB410 x 2 | Yokomo YZ-2 DTM x 2 | LC Racing EMB-1 Buggies and Truggies >
Cain is offline   Reply With Quote
Old 02-26-2010, 03:40 AM   #131
Tech Addict
 
Luke Hobson's Avatar
 
Join Date: Jul 2005
Location: newark, nottinghamshire, UK
Posts: 526
Send a message via MSN to Luke Hobson
Default

I know it's probably been said before.

Generally you want to soften the car up all round (springs) and increase the damping (oils) to slow the roll down
a firmer spring may delay the traction roll but it will just make it bite hard when it does....

You can always raise both your front hinge pin braces and raise front inner camber link to help stop this. This is quite a big change but will definatly help.

Also something people forget is staggering your additive. Rather than 20 mins on all corners, try 30 mins on rear and 10 on front. At some big races we've used it on the front for even less... But that's really just fine tuning tbh.

Hth
Luke
__________________
Luke Hobson
Awesomatix - Xenon - Godzilla Paint - Moorespeed - ToniSport - MBmodels

http://luke-hobson.blogspot.com/
Luke Hobson is offline   Reply With Quote
Old 04-05-2012, 02:59 AM   #132
Tech Adept
 
Join Date: Oct 2009
Location: AUSTRIA
Posts: 233
Send a message via ICQ to vitomon Send a message via Skype™ to vitomon
Default

hi guys, just stumbled over that thread as i searched for cures to my traction roll problem. we are running ride 32 tires and a i drive a bd5.

as recommended in the thread i softened the springs and went for a 450/500 MM oil. droop is set to 6/5mm under the arms. i tried the kit 1.3 swaybar in front but changed to 1.6 which seemed to better the situation. however, i think due to the chassis plate layout in front of the bd5, i think when the chassis actually touches the surface on the front left/right, the little thingy were the droopscrew touches just barries itself into the carpet causing the car to flip. is that a possibility???

should i go higher ride height? but that would probably increase the risk of traction roll on the other hand too right?
__________________
Infinity -- Orion ESC -- Sanwa M11x
May the grip be with you ... always!
vitomon is offline   Reply With Quote
Old 05-30-2012, 01:59 PM   #133
Tech Fanatic
 
silverhkswrx's Avatar
 
Join Date: Dec 2008
Location: Tampa, Fl.
Posts: 988
Trader Rating: 10 (100%+)
Send a message via AIM to silverhkswrx Send a message via Skype™ to silverhkswrx
Default

I have a TA06 exotek converted. It is VERY narrow. Even more narrow than a Team Magic. The rear is gear drive, and the front is belt driven. I Was running the IFS setup, but it was inconsistant not to mention heavy. This setup however allowed low nose bodies which allowed more steering through the additional traction the front generated. my rear would want to slide out and cause traction roll. I found myself taking the outside line to stay out of the compound soaked hairpin, losing time, but gaining it back slightly on the straight away. I have chosen to go with the standard shock setup and a tc body, I will lay my shocks down one more hole and reduce camber in the front and rear by 1*. A vet at my track reccomended addind camber, but my speed suffered greatly and my tire wear significantly increased.

I am running a 3mm spacer under the ball joint in the front and rear to reduce my roll center, and I cant see being at 4mm... there is nothing on the outside of the chassis and I feel the roll is coming from the over steering and nose dive causing my rear to lift.

I am open to more sugguestions from those familiar with tamiyas in my case.
__________________
SpeedPassion 17.5R powered TRF417X
My son owns: Team Associated RC18R2
(RC18B2 converted to a RC18R)

http://www.tamiya.com/english/rc/manuals.htm
silverhkswrx is offline   Reply With Quote
Old 05-30-2012, 02:33 PM   #134
Tech Master
 
Join Date: Jun 2011
Location: Northeast GA
Posts: 1,685
Arrow

Quote:
Originally Posted by silverhkswrx View Post
I have a TA06 exotek converted. It is VERY narrow. Even more narrow than a Team Magic. The rear is gear drive, and the front is belt driven. I Was running the IFS setup, but it was inconsistant not to mention heavy. This setup however allowed low nose bodies which allowed more steering through the additional traction the front generated. my rear would want to slide out and cause traction roll. I found myself taking the outside line to stay out of the compound soaked hairpin, losing time, but gaining it back slightly on the straight away. I have chosen to go with the standard shock setup and a tc body, I will lay my shocks down one more hole and reduce camber in the front and rear by 1*. A vet at my track reccomended addind camber, but my speed suffered greatly and my tire wear significantly increased.

I am running a 3mm spacer under the ball joint in the front and rear to reduce my roll center, and I cant see being at 4mm... there is nothing on the outside of the chassis and I feel the roll is coming from the over steering and nose dive causing my rear to lift.

I am open to more sugguestions from those familiar with tamiyas in my case.
Lowering the roll center will encourage the car to traction roll more. Try raising it. You will reduce rolling and increase the mechanical grip demands of the tires. You may actually start pushing. Increasing camber will help if the side wall of the tire is rolling under in a turn. Adding toe out in the front may help too.
__________________
3Racing Sakura XI 17.5 TC
Formula Rabbit (FGX conversion) 21.5
STRC LCG 2WD Slash 17.5
Serpent S120 13.5
6376vette is offline   Reply With Quote
Old 05-30-2012, 03:38 PM   #135
Tech Fanatic
 
silverhkswrx's Avatar
 
Join Date: Dec 2008
Location: Tampa, Fl.
Posts: 988
Trader Rating: 10 (100%+)
Send a message via AIM to silverhkswrx Send a message via Skype™ to silverhkswrx
Default

Quote:
Originally Posted by 6376vette View Post
Lowering the roll center will encourage the car to traction roll more. Try raising it. You will reduce rolling and increase the mechanical grip demands of the tires. You may actually start pushing. Increasing camber will help if the side wall of the tire is rolling under in a turn. Adding toe out in the front may help too.
So reduce the spacing on the roll center adjuster?
__________________
SpeedPassion 17.5R powered TRF417X
My son owns: Team Associated RC18R2
(RC18B2 converted to a RC18R)

http://www.tamiya.com/english/rc/manuals.htm
silverhkswrx is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Traction Roll ? gansei Nitro On-Road 75 10-12-2012 12:38 AM
Traction Compounds : Health Risks : what can we do about this? Martin Crisp Electric On-Road 785 06-11-2007 03:49 PM
stopping traction rolling James605 Electric On-Road 33 04-23-2006 12:10 PM
Advice on traction rolling? Fred Perkins Electric On-Road 32 01-20-2004 03:08 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 10:32 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