Mike "Wuzzy121". Rest in peace, brother

Go Back   Tacoma World Forums > Tacoma Garage > Suspension

Notices

Tires rub body mount after LR UCA install, will more castor help?

Reply
 
Thread Tools Search this Thread
Old 01-16-2011, 05:16 PM   #1
Dr.D [OP] Dr.D is offline
Member
Dr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of light
 
Dr.D's Avatar
Name: sold my truck
Joined: Sep 2009, #23367
Gender: Dude
Posts: 89
Dr.D's Tacoma Gallery
Tires rub body mount after LR UCA install, will more castor help?

I searched and could not find the answer to my question.

So I put Light Racing UCA's on my truck and since I did this I get tire rub on the body mounts when I hit a small bump while turning. Here are my alignment specs.


Now my question is, if I increase my castor will that help stop this rubbing? I read some where that when you increase castor it pushes the tire more forward due to the how it adjusts from the lower control arm. Or do I have it backwards? Before the UCA's I did not have this rubbing.
Attached Thumbnails
Tires rub body mount after LR UCA install, will more castor help?-2011-01-13-12.41.56.jpg  
  Reply With Quote
Old 01-16-2011, 10:02 PM   #2
Senior Member
jr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shedjr114 is one of the sharper tools in the shed
Name: Jon
Joined: Nov 2009, #26147
Location: SoCal
Gender: Male
Posts: 1,184
jr114's Tacoma Gallery
full lock? or while turning? going over bumps at the same time?
  Reply With Quote
Old 01-16-2011, 10:03 PM   #3
Senior Member
ktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shed
 
ktmrider's Avatar
Joined: Jul 2009, #19933
Gender: Male
Posts: 5,115
ktmrider's Tacoma Gallery
yes. On my current application of 285 km2s I did not in normal driving with 2.6. I have mine set for 2.9 on both sides and have the body mount chopped.
  Reply With Quote
Old 01-17-2011, 06:57 AM   #4
ROLL TIDE!!!!!!!
Bama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shed
 
Bama_TACO's Avatar
Joined: Aug 2010, #41157
Location: Winfield, AL
Gender: Male
Posts: 1,020
Bama_TACO's Tacoma Gallery
More caster actually moves the tire toward the rear of the fender so you would rub more with more caster. If you look at the tire from the side, the more caster the further the tire runs behind the axis of the upper strut mount.
  Reply With Quote
Old 01-17-2011, 09:26 AM   #5
Senior Member
ktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shedktmrider is one of the sharper tools in the shed
 
ktmrider's Avatar
Joined: Jul 2009, #19933
Gender: Male
Posts: 5,115
ktmrider's Tacoma Gallery
^ actually the way I understand it, more caster tilts the spindle assembly towards the rear of the fender moving the tire forward.

http://www.ozebiz.com.au/racetech/theory/align.html

Quote:
A backward tilt is positive (+) and a forward tilt is negative (-).
but the tilt they are talking about is in relation to the spindle so if it is backwards tilt the tire would actually be forward and + caster number.

Quote:
Caster is the angle to which the steering pivot axis is tilted forward or rearward from vertical, as viewed from the side. If the pivot axis is tilted backward (that is, the top pivot is positioned farther rearward than the bottom pivot), then the caster is positive; if it's tilted forward, then the caster is negative.
  Reply With Quote
Old 01-17-2011, 11:23 AM   #6
Dr.D [OP] Dr.D is offline
Member
Dr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of light
 
Dr.D's Avatar
Name: sold my truck
Joined: Sep 2009, #23367
Gender: Dude
Posts: 89
Dr.D's Tacoma Gallery
When adjusting the lower control arm for castor, wouldn't that move the lower control arm forward changing the axis and postion of the upper ball joint. Not moving the tire more towards the rear?

I know that when my castor was at 1.6 before my UCA's I did not have this. So the increase in castor must move it more backwards I guess.

jr114
It doesn't rub at full turn, only while turning and hitting bumps or going up my angled drive way with my wheels turned.
  Reply With Quote
Old 01-17-2011, 11:26 AM   #7
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
chris4x4's Avatar
Name: FlimFlubberJAM
Joined: May 2008, #6497
Location: Tenoe, AZ
Gender: Male
Posts: 97,461
chris4x4's Tacoma Gallery
Quote:
Originally Posted by Dr.D View Post
When adjusting the lower control arm for castor, wouldn't that move the lower control arm forward changing the axis and postion of the upper ball joint. Not moving the tire more towards the rear?
Yes. If Caster is added via the UCA, then it will move it more tward the rear.
  Reply With Quote
Old 01-17-2011, 11:31 AM   #8
RN
BenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shedBenJammn5 is one of the sharper tools in the shed
 
BenJammn5's Avatar
EMS:
Joined: Feb 2009, #13326
Location: San Diego
Age: 29
Gender: Dude
Posts: 1,364
BenJammn5's Tacoma Gallery
Quote:
Originally Posted by Dr.D View Post
When adjusting the lower control arm for castor, wouldn't that move the lower control arm forward changing the axis and postion of the upper ball joint. Not moving the tire more towards the rear?

I know that when my castor was at 1.6 before my UCA's I did not have this. So the increase in castor must move it more backwards I guess.

jr114
It doesn't rub at full turn, only while turning and hitting bumps or going up my angled drive way with my wheels turned.
+ caster moves the tire forward, - caster moves it back. The further back it is, the better is steering is, however you need to find a compromise.

My caster is 3.4 degrees with the body mount chopped and pinched. With 285's I still rub a little on the rear mount when flexed but not bad.

In your case I'd try another degree forward from 2.3 to 3.3. Also get them to dial that camber to 0 or slightly negative.

I've tried it all. 5 degrees is too much and you'll hit the front plastic, 2.6 is too far back, so I've found the best success with 3.2-4 degrees caster.
  Reply With Quote
Old 01-17-2011, 12:14 PM   #9
ROLL TIDE!!!!!!!
Bama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shed
 
Bama_TACO's Avatar
Joined: Aug 2010, #41157
Location: Winfield, AL
Gender: Male
Posts: 1,020
Bama_TACO's Tacoma Gallery
Here's the deal. A good example of positive caster is the front wheels of a shopping cart. Notice how they follow the direction the cart is going. It's because the center of the wheel is behind the mounting point. If a UCA is used to get more caster it would move the ball joint toward the front of the truck. If the lower control arm is used to increase caster you would move it toward the rear of the truck.
  Reply With Quote
Old 01-17-2011, 12:48 PM   #10
Senior Member
Sublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shed
 
Sublime's Avatar
Name: Mike
Joined: Nov 2009, #25918
Location: Phoenix, AZ
Age: 35
Gender: Dude
Posts: 3,619
Sublime's Tacoma Gallery
I was just in the same boat as OP. I was starting to rub drivers side on the rear fenders by the pinch weld. Took it in and caster was 1.5 drivers side and 3 passenger. There was my answer. Already had the cab mounts chopped and still did the pinch weld mod since I off-road frequently. I would say chop them....you won't even notice! And get your caster at least 3.
  Reply With Quote
Old 01-17-2011, 12:54 PM   #11
BIG DADDY
brutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shed
 
brutalguyracing's Avatar
Joined: Jun 2009, #19000
Location: F.U> GUYZ
Age: 84
Gender: Male
Posts: 24,007
brutalguyracing's Tacoma Gallery
well here is my set up i have the ball joints adjusted +2 foward....
and was able to obtain perfect #'s with no body mount rubbing
'with no chop"
  Reply With Quote
Old 01-17-2011, 01:01 PM   #12
Senior Member
Sublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shedSublime is one of the sharper tools in the shed
 
Sublime's Avatar
Name: Mike
Joined: Nov 2009, #25918
Location: Phoenix, AZ
Age: 35
Gender: Dude
Posts: 3,619
Sublime's Tacoma Gallery
There you go OP!

You guys have the same uca's?
  Reply With Quote
Old 01-17-2011, 01:02 PM   #13
Dr.D [OP] Dr.D is offline
Member
Dr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of lightDr.D is a glorious beacon of light
 
Dr.D's Avatar
Name: sold my truck
Joined: Sep 2009, #23367
Gender: Dude
Posts: 89
Dr.D's Tacoma Gallery
Bama and BenJammn you guys said two different things. Which is correct?
Postive castor with adjustment of the lower control arm will move the tire to the rear or front of the truck. Front right? And the LR upper control arm moves it towards the rear.
  Reply With Quote
Old 01-17-2011, 01:07 PM   #14
BIG DADDY
brutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shed
 
brutalguyracing's Avatar
Joined: Jun 2009, #19000
Location: F.U> GUYZ
Age: 84
Gender: Male
Posts: 24,007
brutalguyracing's Tacoma Gallery
  Reply With Quote
Old 01-17-2011, 01:08 PM   #15
BIG DADDY
brutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shedbrutalguyracing is one of the sharper tools in the shed
 
brutalguyracing's Avatar
Joined: Jun 2009, #19000
Location: F.U> GUYZ
Age: 84
Gender: Male
Posts: 24,007
brutalguyracing's Tacoma Gallery
i am at -2.0 on each side
ball joint rotated all the way to front.....
no rubbing anymore with some front fender trimming.....
and i have wheeled it many times hard....
  Reply With Quote
Old 01-17-2011, 01:53 PM   #16
ROLL TIDE!!!!!!!
Bama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shed
 
Bama_TACO's Avatar
Joined: Aug 2010, #41157
Location: Winfield, AL
Gender: Male
Posts: 1,020
Bama_TACO's Tacoma Gallery
This is what I was saying. Below is using the upper control arm (not stock) to adjust caster. Moving the upper mount forward increases caster. If you are using the lower control arm for adjustment, moving the control arm rearward increases caster.

Quote:
Originally Posted by brutalguyracing View Post
  Reply With Quote
Old 01-17-2011, 02:15 PM   #17
Roll Tide
HondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shedHondaGM is one of the sharper tools in the shed
 
HondaGM's Avatar
Name: James
Joined: Oct 2009, #25056
Location: South-Pole
Age: 50
Gender: Dude
Posts: 5,799
HondaGM's Tacoma Gallery
Quote:
Originally Posted by Dr.D View Post
Bama and BenJammn you guys said two different things. Which is correct?
Postive castor with adjustment of the lower control arm will move the tire to the rear or front of the truck. Front right? And the LR upper control arm moves it towards the rear.
  Reply With Quote
Old 01-17-2011, 05:32 PM   #18
ROLL TIDE!!!!!!!
Bama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shedBama_TACO is one of the sharper tools in the shed
 
Bama_TACO's Avatar
Joined: Aug 2010, #41157
Location: Winfield, AL
Gender: Male
Posts: 1,020
Bama_TACO's Tacoma Gallery
Ok, your illustration and this one I found below prove that I am completely backwards in my thinking.

  Reply With Quote
Old 01-17-2011, 06:25 PM   #20
Carolina Alliance Southwest Region Ambassador
jandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shedjandrews is one of the sharper tools in the shed
 
jandrews's Avatar
Joined: Jun 2009, #18122
Gender: Guy
Posts: 12,159
jandrews's Tacoma Gallery
Caster will help but probably not eliminate the problem. High amounts of flex and lock just put the tires into the cab mounts. Best solution is to chop and box.
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Body mount Rub / Chop help ffemt2987 2nd Gen. Tacomas 5 12-10-2011 05:13 PM
EASIER INSTALL TC UCA OR LR UCA Tbaytaco Suspension 10 11-04-2011 12:06 AM
Bad Frame Rub LR UCA Solved Problem BrodyJ29 2nd Gen. Tacomas 0 09-06-2011 04:21 PM
tires rub after light racing uca install and align 07TaCo07 2nd Gen. Tacomas 8 08-08-2011 01:06 PM
Body mount rub after LR uca and allignment Amo-cat3 Suspension 4 11-08-2009 02:32 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.