Like Tree2Likes

Tamiya TRF418

Old 09-29-2014, 07:31 PM
  #1846  
Tech Elite
 
niznai's Avatar
 
Join Date: Feb 2009
Location: All over the place
Posts: 2,974
Default

You're looking in the wrong place. Check the inboard suspension hinge pins. They're bent.
niznai is offline  
Old 09-29-2014, 07:37 PM
  #1847  
Tech Elite
iTrader: (77)
 
Join Date: Jun 2010
Location: Southern California
Posts: 2,167
Trader Rating: 77 (100%+)
Default

Originally Posted by niznai
You're looking in the wrong place. Check the inboard suspension hinge pins. They're bent.
Sorry when you say inboard, the long ones connecting arms at bulkhead or short ones holding c-hubs?

I have not checked those yet..
goin2drt is offline  
Old 09-29-2014, 07:42 PM
  #1848  
Tech Regular
iTrader: (1)
 
TB03Racer09's Avatar
 
Join Date: Mar 2011
Location: Sydney Australia
Posts: 427
Trader Rating: 1 (100%+)
Default

Originally Posted by goin2drt
Sorry when you say inboard, the long ones connecting arms at bulkhead or short ones holding c-hubs?

I have not checked those yet..
The longer ones
TB03Racer09 is offline  
Old 09-29-2014, 07:45 PM
  #1849  
Tech Elite
iTrader: (77)
 
Join Date: Jun 2010
Location: Southern California
Posts: 2,167
Trader Rating: 77 (100%+)
Default

Thanks. I will try that tomorrow. I had to take a break ��
goin2drt is offline  
Old 09-30-2014, 01:16 AM
  #1850  
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 4,435
Default

Since the steering has no binding when disconnected, I am sure the problem is in the servo itself or the servo horn.

I see you have the Tamiya servo saver on there. One common mistake is to put the wrong servo spline adaptor on there e.g. Sanwa adaptor with a Futaba servo. That causes the inconsistent centring you mention and makes the car basically undrivable.

The other possibility is clumsy assembly of the servo saver. People have a tendency to overtighten the screw that goes into the servo which crushes the plastic and the saver binds. Another common mistake is forcing the springs on (they are difficult but precision is worth spending time on). By forcing the springs, the edges can also damage the plastic part that keeps them lined up, so you end up with free play.

Final possibility is the servo itself. I don't recognise the one you have, but some cheap brands are just... shit, basically. Loads of slop or binding in the geartrain which renders them unfit for purpose. Even a quality servo may have wear and tear or a manufacturing defect, I once had a KO servo that would only work with a KO horn, other manufacturer's horns just weren't a good enough fit. I've also seen plenty of non-Futaba servos with a "Futaba compatible" spline that were a poor fit in Futaba horns.
sosidge is offline  
Old 09-30-2014, 01:29 AM
  #1851  
PDR
Tech Elite
iTrader: (31)
 
PDR's Avatar
 
Join Date: Oct 2008
Location: Sydney, Australia
Posts: 2,138
Trader Rating: 31 (100%+)
Default

Just to continue the chain of possible issues:

* receiver malfunction
* Transmitter malfunction

You never really know until you've exhausted the whole end-to-end
PDR is offline  
Old 09-30-2014, 01:31 AM
  #1852  
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 4,435
Default

Originally Posted by PDR
Just to continue the chain of possible issues:

* receiver malfunction
* Transmitter malfunction

You never really know until you've exhausted the whole end-to-end
A loose pot in the transmitter will give a similar issue. Had it myself once many years ago.
sosidge is offline  
Old 09-30-2014, 02:50 AM
  #1853  
Tech Fanatic
 
Salkin's Avatar
 
Join Date: Jan 2014
Posts: 882
Default

Struggled myself a little with the Tamiya servo saver, to get the little slop away.

Learned that some put a drop of superglue in the saver to keep it slop free, and the impact from a hard crash would break the glue, allowing the servo saver to operate as intended.

Guess even if the steering in itself are moving without binding, there should not be excessive slop either in the steering links, which could cause the car not center properly.
Salkin is offline  
Old 09-30-2014, 04:47 AM
  #1854  
Tech Master
iTrader: (11)
 
b20btec's Avatar
 
Join Date: Oct 2011
Location: Sugar Land
Posts: 1,188
Trader Rating: 11 (100%+)
Default

You guys bring up many good points. I Went ahead and swapped out my aluminum tamiya horn to an xray servo saver and it pretty much fixed the problem.
b20btec is offline  
Old 09-30-2014, 06:11 AM
  #1855  
Tech Fanatic
 
Salkin's Avatar
 
Join Date: Jan 2014
Posts: 882
Default

Originally Posted by b20btec
You guys bring up many good points. I Went ahead and swapped out my aluminum tamiya horn to an xray servo saver and it pretty much fixed the problem.
Just curious, the aluminium Tamiya servo horn is a solid part. Either it did not fit the spline on the servo (too big) or the ball stud attached to the end of the servo horn was loose.
Salkin is offline  
Old 09-30-2014, 06:34 AM
  #1856  
Tech Master
iTrader: (35)
 
Csaari77's Avatar
 
Join Date: Nov 2004
Location: Huntsville, AL
Posts: 1,512
Trader Rating: 35 (100%+)
Default

Something else to consider is the amount of use on the servo saver. The plastic wears after use, especially if you are hitting things. I experienced the same problem with the servo not centering. I thought it was the servo, which i replaced with a new Futaba BLS551, but the issue was still there with the new servo. I replaced the servo saver and the issue went away. After I took the old saver off the car I noticed that the plastic had been crushed down by the metal spring collars, which was causing the steering to wander. It was an expensive lesson to learn...
Csaari77 is offline  
Old 09-30-2014, 06:37 AM
  #1857  
Tech Elite
iTrader: (77)
 
Join Date: Jun 2010
Location: Southern California
Posts: 2,167
Trader Rating: 77 (100%+)
Default

Guys.

First and foremost it was working perfectly. I then had a little brush with the boards and now it is not.

I have tried a direct servo horn to eliminate any possibility with the servo saver, it's not that.
I have used two different servos, both brand new, a Savox and a Protek it does the same thing with both, not that.
I have replaced all the C-hubs and uprights, not that.

I will try the inbound hinge pins tonight
I guess it could be the radio or transmitter but that does not seem probable and will be the last thing I try as I don't have a spare just sitting around.

I have ordered a new servo saver, but I am confident that is not the issue as like I said I did just put on a regular horn, with the correct spline, and that did not fix it.
goin2drt is offline  
Old 09-30-2014, 08:44 AM
  #1858  
Tech Elite
 
niznai's Avatar
 
Join Date: Feb 2009
Location: All over the place
Posts: 2,974
Default

C'mon. It's easy to test. Just power everything up and with the steering dead straight (as much as you can) grab a wheel and pull it hard around. Watch what happens. The car will tell you.
niznai is offline  
Old 09-30-2014, 09:53 AM
  #1859  
Tech Master
iTrader: (11)
 
b20btec's Avatar
 
Join Date: Oct 2011
Location: Sugar Land
Posts: 1,188
Trader Rating: 11 (100%+)
Default

Originally Posted by Salkin
Just curious, the aluminium Tamiya servo horn is a solid part. Either it did not fit the spline on the servo (too big) or the ball stud attached to the end of the servo horn was loose.
Its actually fit perfect, along with the ballstud, and 3mm screw. I believe the problem occurred when I removed it to swap servo. I knew it was going to be a pain to get off, when I got it back onto the new servo that's when the play came about but didn't realize it until I did a swap for a xray saver.

I said earlier in a post I gave up, but I was setting up the car for outdoor track I wanted to install a servo saver. Anyways it came off a lot easier than before, that's when I knew. Putting it on the setup station for throw before and after pretty much confirmed it.

Sanwa ers-971
Xray saver
b20btec is offline  
Old 09-30-2014, 09:56 AM
  #1860  
Tech Elite
 
niznai's Avatar
 
Join Date: Feb 2009
Location: All over the place
Posts: 2,974
Default

You guys in the US have the Kimborough servo savers which are a cheap reliable alternative to the expensive Xray option (and the expensive, crappy Tamiya option).
niznai is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.