1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Caster specific question...

Discussion in '2nd Gen. Tacomas (2005-2015)' started by DrRabbitFurHead, Aug 11, 2009.

  1. Aug 11, 2009 at 4:20 PM
    #1
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    OK, I'm considering doing an experiment and want to make sure I'm not doing something stupid.

    I am thinking about having an alignment to try to help my larger wheels clear the pinch weld and cab mount and I'm thinking about trying to have my CASTER set to something around 1.3 degrees.

    I've read Toku58's sticky thread, read the tirerack recommendations, searched my arse off and realize that when it comes to caster, more is better (especially if you have power steering). HOWEVER, the sticky talks about "bump steer" if you have too much caster but it does not speak of the negatives of having "too little" caster.

    One advantage to less caster would be moving the tire further forward in the wheel well which is what I NEED! I have my truck sitting level right now and I have tons of room to move the wheel forward with the All Pro bumper, but don't know what the effect of having the CASTER set at the factory minimum would be.

    Can anyone chime in and give some insight?
     
  2. Aug 11, 2009 at 4:24 PM
    #2
    BeachBoy

    BeachBoy Well-Known Member

    Joined:
    Apr 10, 2009
    Member:
    #15819
    Messages:
    657
    Gender:
    Male
    VT & QC
    Vehicle:
    '09 DC LB Sport+Leather
    Icon Extended COs / Camburg UCA / ATX Predator Teflon / Mickey Thompson MTZ / Color-Matched emblems / All-Pro Bumper & skids / Stubbs HD-SKO / Alcans custom leafs / U-Bolt flip / Icon rear resi shocks / Rear Bumper
    I pushed mine as far as it could go while keeping the other specs within range and it helped a ton rubbing.

    I think you can go close to +3 deg for caster, I was originally at something like -0.5 and now I am at about +2.
     
  3. Aug 11, 2009 at 4:39 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,158
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Too little caster and you will have wandering, and bump steer.
     
  4. Aug 11, 2009 at 5:17 PM
    #4
    SpaceMonkey

    SpaceMonkey Well-Known Member

    Joined:
    Apr 12, 2009
    Member:
    #15886
    Messages:
    600
    Gender:
    Male
    Houston, Tx
    Vehicle:
    06 PreRunner
    Try to aim for 3 to 3.5. This will move your wheels forward away from the cab mount. Don't go too high or you'll suffer bump steer.
     
  5. Aug 11, 2009 at 5:21 PM
    #5
    Brunes

    Brunes abides.

    Joined:
    May 31, 2008
    Member:
    #7011
    Messages:
    17,641
    Gender:
    Male
    First Name:
    Rotorhead
    DC or New Jersey - Depends on the day....
    Vehicle:
    08 Red/Graphite and Satin Black
    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit
    Cosign- I got a huge lesson in caster today....and what the tech boiled it down to:
    Lots of positive caster (think motorcycle or European car-which tend to have 8-10* of caster) will tend to keep you going straight and will resist turning so your direction control is very good but too much and it gets to making steering hard.
    Too little or negative caster (think a shopping cart or toolbox "caster" wheels) will follow every little bump and groove in the road- giving the poor directional control.
     
  6. Aug 11, 2009 at 6:06 PM
    #6
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    I'm confused. The measurements from my last alignment had the caster set at +2.1 degrees on the drivers side and +1.7 degrees on the passenger side. I'm pretty sure that I have worse rubbing on the drivers side than on the passengers side, so that made me think that LOWERING the caster would help me gain more clearance.

    Another source of my confusion comes from this link... http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=4
    It would appear as if positive camber moves the bottom of the wheel outward and the top of the wheel inward which doesn't appear to solve anything (I know I'm missing something).

    The replies above talk about me wanting 3 and 3.5 degrees of caster which is MUCH greater than I have now. My factory alignment sheet says 2.8 degrees is the top end of the factory specs so do I want to INCREASE my caster to 2.8 degrees and if so, do those of you at that high of an angle experience bump steer?

    Thanks for helping me get through this... :cool:
     
  7. Aug 11, 2009 at 6:09 PM
    #7
    rpparkster

    rpparkster Well-Known Member

    Joined:
    Apr 10, 2009
    Member:
    #15818
    Messages:
    538
    Gender:
    Male
    First Name:
    Roger
    Long Beach, CA
    Vehicle:
    2009 Tacoma TRD 4X4
    TRD FJ Wheels, 285 GY DuraTrac's, Fox 2.5 C/O w/ Res, TC UCA's, Demello Sliders,AllPro 3" Leaf Pack, Walker Evans 2.0 Adj. RR, AllPro Front Bumper & IFS Skid, Timbren Bump Stops, Leather
    More Caster pushes the wheel forward in the wheel well. You want more Caster.
     
  8. Aug 11, 2009 at 6:12 PM
    #8
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    Thanks OakleyTRD... Yeah, I read that 2.4 is ideal in the sticky, then I saw Chris4X4 post just below Toku58's post and said that lower caster increased clearance (which is what I thought initially). Now, others are contradicting what I understood Chris to say and I'm confused. :eek:

    I'm almost willing to risk bump steer to gain clearance. I know 1.7 degrees and 2.1 degrees rubs (which is what I have now) and I do not want to rub if I stuff the front end. I'm trying to find the right balance and am confused which direction I want to go... lower toward 1.3 degrees or higher toward 2.8 degrees.
     
  9. Aug 11, 2009 at 6:13 PM
    #9
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    That's what I was looking for! Thanks.
     
  10. Aug 11, 2009 at 6:20 PM
    #10
    toku58

    toku58 Well-Known Member

    Joined:
    Oct 10, 2008
    Member:
    #9882
    Messages:
    1,026
    Gender:
    Male
    HAWAII
    Vehicle:
    4x4 Beast!
    6" Fabtech Stage II, 17x9" Centerline Eclipse rims, with 12.5x35x17" BFG KM2's. On board air system,Toyota skid plate, spidertrax wheel spacers, TRD CAI w/AFE ProDry filter (21-90045),Flowmaster Dual exhaust, GrillCraft grill w/custom emblem, Custom Shifter, BushWacker fender flares, Hood struts, Underhood lights, TW driveshaft, Wet Okole seat covers, Dashlight mod, Many other little things to make the truck complete!
    Because they adjust your caster from the LCA's your tire will move forward as your caster gets higher.

    So raise your caster.
    But ask them to do it from the LCA's NOT the LR UCA's!
    Good Luck!
     
  11. Aug 11, 2009 at 6:23 PM
    #11
    toku58

    toku58 Well-Known Member

    Joined:
    Oct 10, 2008
    Member:
    #9882
    Messages:
    1,026
    Gender:
    Male
    HAWAII
    Vehicle:
    4x4 Beast!
    6" Fabtech Stage II, 17x9" Centerline Eclipse rims, with 12.5x35x17" BFG KM2's. On board air system,Toyota skid plate, spidertrax wheel spacers, TRD CAI w/AFE ProDry filter (21-90045),Flowmaster Dual exhaust, GrillCraft grill w/custom emblem, Custom Shifter, BushWacker fender flares, Hood struts, Underhood lights, TW driveshaft, Wet Okole seat covers, Dashlight mod, Many other little things to make the truck complete!
    Now I'm confused!:confused:
     
  12. Aug 11, 2009 at 6:33 PM
    #12
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    Join the club!!! :D

    I'll ask the tech to adjust the lower control arm (LCA) and try his best to nail 2.4 degrees of caster (or err on the high side if necessary). Should I have him/her chase the caster with the UCA to move the wheel further forward too? What I mean is that if they need to increase by 0.4 degrees, could they shift the UCA and LCA both an equivalent amount to get more clearance, then adjust the LCA a bit more to really create some clearance?
     
  13. Aug 11, 2009 at 6:37 PM
    #13
    Brunes

    Brunes abides.

    Joined:
    May 31, 2008
    Member:
    #7011
    Messages:
    17,641
    Gender:
    Male
    First Name:
    Rotorhead
    DC or New Jersey - Depends on the day....
    Vehicle:
    08 Red/Graphite and Satin Black
    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit
    Son of a bitch.....Damn auto formatting the forums does....

    Nope...looked great and made sense on my screen when I went to edit it and show up screwed up....


    Trust me- It was a lame ass character drawing of positive and negative caster

    ::Jedi mind trick hand wave::
     
  14. Aug 11, 2009 at 6:38 PM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,158
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    :rofl::rofl:
     
  15. Aug 12, 2009 at 12:57 AM
    #15
    rpparkster

    rpparkster Well-Known Member

    Joined:
    Apr 10, 2009
    Member:
    #15818
    Messages:
    538
    Gender:
    Male
    First Name:
    Roger
    Long Beach, CA
    Vehicle:
    2009 Tacoma TRD 4X4
    TRD FJ Wheels, 285 GY DuraTrac's, Fox 2.5 C/O w/ Res, TC UCA's, Demello Sliders,AllPro 3" Leaf Pack, Walker Evans 2.0 Adj. RR, AllPro Front Bumper & IFS Skid, Timbren Bump Stops, Leather
    Rabbit, I don't think the UCA is adjustable. I have Total Chaos UCA and they are fixed, so all the adjustments are made on the LCA. If they dial in the Caster correctly, it will move the wheel to increase your clearance.
     
  16. Aug 12, 2009 at 2:43 AM
    #16
    DrRabbitFurHead

    DrRabbitFurHead [OP] Yeah, there's a TSB for that!

    Joined:
    Jun 18, 2009
    Member:
    #18625
    Messages:
    1,058
    Gender:
    Male
    Salem, VA
    Vehicle:
    X-treme Off Road Edition (4x4)
    Icon Extended Travel Coil Overs, Fox Rear Resi 8-Way Adjustable Shocks, Light Racing UCA's, OME Rear Leafs, M/T Classic Locks 17x9, Nitto T/G (285/70/R17), 5mm Billet Aluminum Spacers, Demello Sliders, All Pro Front Plate Bumper & IFS Skid Plate, PIAA 510's, Doug Thorley Long Tube Headers, O2 sims, Rear Timbren's & U-Bolt Flip Kit , 3* Rear Axel Shims, Extended Rear Brake Lines, 48" Hi-Lift with a ton of accessories, Wet Okoles, TRD bed mat, Borla Air Filter, Garmin Nuvi 765T, Viper 5901 remote start, 50% tint.
    That's the beauty of the Light Racing UCA's. They have an adjustable ball joint with a lock plate that allows the front caster to be set at one of 7 positions: +2.0*, +1.75*, +1.0*, 0*, -1.0*, -1.75*, and -2.0* from the "default" setting when the UCA is installed. The instructions say for the instaler to measure caster on the stock UCA's, record measurement, install the LR UCA's and set the lock plate over the hex of the ball joint to the desired caster position (listed above)... That's why I was asking if I could "chase" the caster by moving BOTH the upper control arm AND the lower control arm. Hopfully Toku58 knows what I'm talking about and can chime in (or someone else for that matter).

    I'm not sure where my arms are set right now, but I'm 100% sure the caster on the Light Racing UCA's is adjustable, in those increments at a minimum, because 1/3 of the installation instructions talks about it.
     
To Top