R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-07-2006, 08:45 AM   #6931
Tech Addict
 
1shnot's Avatar
 
Join Date: Feb 2003
Location: Maple,ontario,Canada
Posts: 512
Trader Rating: 2 (100%+)
Default

it shakes when car is on the car stand.... but the funny thing is, it only does it when the tires are on.... without the tires it does not shake..
I did try few different tires, 26mm foam 28mm foam (with shims and without) even rubber tires
Reason I've got this car was to have on power steering over my fk05 and being 70% D/R and 70% left and right it just seem right .... But I love the car other wise

weird
1shnot is offline   Reply With Quote
Old 04-07-2006, 08:49 AM   #6932
Tech Master
 
koabich's Avatar
 
Join Date: Oct 2003
Location: Detroit Area
Posts: 1,359
Send a message via Yahoo to koabich
Default

Is there a noise assoicated with the shaking?
koabich is offline   Reply With Quote
Old 04-07-2006, 08:51 AM   #6933
Tech Addict
 
1shnot's Avatar
 
Join Date: Feb 2003
Location: Maple,ontario,Canada
Posts: 512
Trader Rating: 2 (100%+)
Default

both....
1shnot is offline   Reply With Quote
Old 04-07-2006, 08:51 AM   #6934
Tech Master
 
subman's Avatar
 
Join Date: Jan 2004
Location: Edmonton,Canada
Posts: 1,237
Trader Rating: 4 (100%+)
Default

if it only does it on the stand who cares? Does it affect the car's performance on track? Are the tires new? If so they may be out of balance hence the shaking at speed.
subman is offline   Reply With Quote
Old 04-07-2006, 08:59 AM   #6935
Tech Addict
 
1shnot's Avatar
 
Join Date: Feb 2003
Location: Maple,ontario,Canada
Posts: 512
Trader Rating: 2 (100%+)
Default

if it does it on the car stand it would have some effect on the track as well...
I could hear some grinding through out the the tight 180's and seems like it scrubs speed cause of that
1shnot is offline   Reply With Quote
Old 04-07-2006, 09:09 AM   #6936
Tech Addict
 
|<R1Z |>'s Avatar
 
Join Date: Nov 2005
Location: why stand on a silent platform
Posts: 636
Trader Rating: 5 (100%+)
Send a message via AIM to |<R1Z |>
Default

Quote:
Originally Posted by 1shnot
if it does it on the car stand it would have some effect on the track as well...
I could hear some grinding through out the the tight 180's and seems like it scrubs speed cause of that
Do you see any wear on the lower front spring retainer? This was actually a common problem on other cars. Even though your EPA/DR might not be set to allow full lock, under certain driving conditions, the wheels may still turn all the way to full lock.

It turned out to be an easy fix with spacing between the kex and the wheel. However, that changed track width. To maintain your current track width, you would want to remove the same amount of spacing between the bulkhead and arm mounts.

So.... check your spring retainer. If there are no marks on it - we have eliminated one source of potential issues.
|<R1Z |> is offline   Reply With Quote
Old 04-07-2006, 09:20 AM   #6937
Tech Regular
 
CrashTstDummy's Avatar
 
Join Date: Feb 2006
Location: Pittsburgh,Pa
Posts: 437
Post

Quote:
Originally Posted by T1Raycer
New arm is now available!!

http://www.corally.com

Contrary to what is being said or shown on Corally Intl site..the new arms and hubs are not here in the states nor available as of this morning per my phone conversations with Corally

Last edited by CrashTstDummy; 04-07-2006 at 09:25 AM. Reason: typo
CrashTstDummy is offline   Reply With Quote
Old 04-07-2006, 09:35 AM   #6938
Tech Addict
 
JohnB's Avatar
R/C Tech Charter Subscriber
 
Join Date: Aug 2002
Location: Oregon City, Or
Posts: 674
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by 1shnot
it shakes when car is on the car stand.... weird
I had a 12th scale servo that did that. As long as I would adjust the End Points left and right it was fine. You know, Set your D/R to 100% then go to EPA, turn the wheel all the way left and reduce the throw until the steering spindle moves just short of full lock and then back up click, then the same turning right. You still have 100% steering but the servo is still not trying to push past full lock. Maybe that won't fix the problem, but it did on my 12th scale and now I do that on all my cars.

take care
john
JohnB is offline   Reply With Quote
Old 04-07-2006, 09:43 AM   #6939
Tech Master
 
Jeff Brown's Avatar
 
Join Date: Nov 2003
Location: Orlando, FL
Posts: 1,913
Default

Quote:
Originally Posted by 1shnot
yeah... found out shimming between the pin and the hex does not help nor putting the shim between hex and the tire does not help either..... I still get the violent shakes when I turn my wheels what is going on?
Is this a common thing for rdx? or just mine?
Do you run a Spool? If so, it does it with every car, especially with no load and the wheels turned, like you said on the carstand.

Jeff
__________________
SXT Traction Compounds | www.TractionCompound.com
Jeff Brown is offline   Reply With Quote
Old 04-07-2006, 10:05 AM   #6940
Tech Addict
 
1shnot's Avatar
 
Join Date: Feb 2003
Location: Maple,ontario,Canada
Posts: 512
Trader Rating: 2 (100%+)
Default

nope no spool.... but I do run the front diff pretty tight... Do you think thats what is causing this?
just to reconfirm, with no load(no tires) it does not shake but with tires it does.. unless you mean by load: on the carpet
1shnot is offline   Reply With Quote
Old 04-07-2006, 10:23 AM   #6941
Tech Apprentice
 
BugFreak's Avatar
 
Join Date: Nov 2005
Location: Bergen - Norway
Posts: 83
Default

I think the shaking is vibration in the driveline at a certain frequency, when you turn the wheels, and the wheels dosn't point the exact same way, they make the car shake.. Had the same problem with my FK05 and the spool (think a tight diff would do the same..) , and when I changed back to one-way - the shaking was gone..

This is what I think...
__________________
Svein E. Pedersen
- tamiya4ever -
BugFreak is offline   Reply With Quote
Old 04-07-2006, 10:47 AM   #6942
Tech Master
 
Join Date: Aug 2002
Location: Nor-Cal
Posts: 1,853
Trader Rating: 18 (100%+)
Default

Quote:
Originally Posted by 1shnot
nope no spool.... but I do run the front diff pretty tight... Do you think thats what is causing this?
just to reconfirm, with no load(no tires) it does not shake but with tires it does.. unless you mean by load: on the carpet
This has to do with the CVDs in the car. Your car must me very new. As the CVDs wear in this becomes less noticable. It is inherent in the design of all of our cars CVDs.

I wouldn't worry about it at all....FWIW

Art
__________________
SMC ( www.smc-racing.com the only place to order your batteries online.), Awesomatix, Gonzo Paints, BN Racing

"Imitation is the sincerest form of flattery."
Advil is offline   Reply With Quote
Old 04-07-2006, 10:51 AM   #6943
Tech Elite
 
Turbonium's Avatar
 
Join Date: Feb 2003
Location: Oklahoma
Posts: 2,302
Trader Rating: 27 (100%+)
Send a message via Yahoo to Turbonium
Default

i have seen this on my rdx's and other cars as well... someone explained it best in another thread when he said that no matter what people say, the "cvd"s in all rc cars are not exactly true constant velocity... as they turn, parts of it speed up and slow down, causing vibration. i think the closest would be the Losi dualjoint set....

i believe the SRC spool has the slots offset for this reason, as a comparison.

on the stand, try to rotate the diff halves in relation to each other, and see if it changes... if so, then like Korey mentioned, maybe set your car up to steer more, and dial back the travel...
__________________
Wes

Team Novak
Turbonium is offline   Reply With Quote
Old 04-07-2006, 11:02 AM   #6944
Tech Addict
 
1shnot's Avatar
 
Join Date: Feb 2003
Location: Maple,ontario,Canada
Posts: 512
Trader Rating: 2 (100%+)
Default

ok thanx alot guys
I'm not gona worry about it until someting major hapend with it....
I'm looking for a very responsive car almost too twichy lol, only on power that is.. may be my car is too new at the momment belts,diffs,cvds....

like I said b4 out of the box it was ALMOST good as my year old fk05 and I had that thing dialed!!!!!!! AWESOME CAR!!!!!!!!
1shnot is offline   Reply With Quote
Old 04-07-2006, 11:08 AM   #6945
Tech Elite
 
andrewdoherty's Avatar
 
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,776
Trader Rating: 47 (100%+)
Default

Wes, I read that other post you're talking about and I think you must be right. (even though I didn't quite get which parts speed up and which parts slow down or when it slows down). I was also thinking that this problem might be exagertated by poor front hub bearings. With the wheels straight ahead there would not be much load on the bearings but then as the wheel is turned more load is applies to the bearing and if it is rough this could show up as vibration. With the wheels off I speculate that the cvd just doesn't have the momentum to vibrate badly. Just a thought.
__________________
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤Hobbywing◢|◤SpeedzoneUSA.com◢|◤Pro-One◢|
|◤ReflexRacing.net◢|◤Protoform◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Corally CCT Pan-touring car biker R/C Items: For Sale/Trade 4 03-02-2010 09:21 PM
Corally CCT Pan touring car biker R/C Items: For Sale/Trade 3 11-05-2003 07:24 AM
Corally F1 w/touring car setup froghead R/C Items: For Sale/Trade 6 10-29-2003 08:10 PM
New Corally Touring Car At Nurnberg JANTLE Electric On-Road 117 04-30-2003 05:23 AM
Brand New Corally C4.1 Touring Car HauntedMyst R/C Items: For Sale/Trade 5 10-25-2002 08:40 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 07:55 AM.


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