Alignment issues with Rubbing and Understeer

JeffP213 · Dec 7, 2015

I'm having the time of my life trying to get my new tires not to rub. I've got the cab mount chopped, have trimmed the shit out of my fender and fender skirt and still no dice.

I was driving home last night and my truck understeered like a SOB and I damn near almost wrecked the thing.

Is it caster or camber that moves the wheel forward in the wheel well, and could moving the tires forward help with understeering? Thanks as always!

username · Dec 7, 2015

Caster. Tell the shop to max it out, or just do it yourself. The return to center won't be as good, but you'll get better turn in and with traction control off will make the truck a little tail happy, but not bad. It will also be much safer in the dirt, you won't be blowing through corners and can drift a little.

ZachPrerunner · Dec 7, 2015

@Unchained 5150 You know alignment issues?

jberry813 · Dec 7, 2015

Post your post-alignment sheet or numbers. @username is dead on. Max the caster out.

Unchained 5150 · Dec 7, 2015

ZachPrerunner said: ↑

@Unchained 5150 You know alignment issues?
Click to expand...

Why what's up bro?

ZachPrerunner · Dec 7, 2015

Unchained 5150 said: ↑

Why what's up bro?
Click to expand...

Didn't know if you could help OP out?

JeffP213 · Dec 7, 2015

I appreciate the help gentlemen! I would adjust myself but I don't have the tools.

So when I take it to the shop, should I have them max out the castor from the UCA? I'm guessing my first question should be "are you familiar enough with an adjustable UCA to do it" if that's what you all suggest.

And maxing it out, will that correct the understeer? And I'd rather not have the backend fish tailing or oversteering as that seems a bit more dangerous.

jberry813 · Dec 7, 2015

JeffP213[OP] said: ↑

I appreciate the help gentlemen! I would adjust myself but I don't have the tools.

So when I take it to the shop, should I have them max out the castor from the UCA? I'm guessing my first question should be "are you familiar enough with an adjustable UCA to do it" if that's what you all suggest.

And maxing it out, will that correct the understeer? And I'd rather not have the backend fish tailing or oversteering as that seems a bit more dangerous.
Click to expand...

There is no adjustment on a factory UCA or aftermarket UCA's except with Light Racing. You adjust the caster by manipulating the camber eccentrics. As for tools...you need like 4 tools and a calculator. https://www.tacomaworld.com/threads/how-to-do-an-alignment-at-home.252256/

Understeer can be caused by numerous issues. Toe alignment, tire pressure, scrub radius, KPI, sway bar removal, shitty tires, driving it like a car....to name a few. That's why I asked for your alignment sheet.

JeffP213 · Dec 7, 2015

jberry813 said: ↑

There is no adjustment on a factory UCA or aftermarket UCA's except with Light Racing. You adjust the caster by manipulating the camber eccentrics. As for tools...you need like 4 tools and a calculator. https://www.tacomaworld.com/threads/how-to-do-an-alignment-at-home.252256/

Understeer can be caused by numerous issues. Toe alignment, tire pressure, scrub radius, KPI, sway bar removal, shitty tires, driving it like a car....to name a few. That's why I asked for your alignment sheet.
Click to expand...

I hear ya on all of the understeer issues as I was aware it could be a number of things. I don't have the original printout, but I know they were close to 0* on both camber and toe. Castor I asked that they set at +3

I have my Dynapro's at 39 PSI and they're brand new. My sway bar is still on. I was driving pretty slow...

jberry813 · Dec 7, 2015

JeffP213[OP] said: ↑

I hear ya on all of the understeer issues as I was aware it could be a number of things. I don't have the original printout, but I know they were close to 0* on both camber and toe. Castor I asked that they set at +3

I have my Dynapro's at 39 PSI and they're brand new. My sway bar is still on. I was driving pretty slow...
Click to expand...

I sincerely doubt you got +3 caster with factory UCA's and 885's. Speculation is impossible. I can only help with the info given.
And 39 psi is too much IMO for these trucks. Keep in mind there is no rear sway bar from the factory.

JeffP213 · Dec 7, 2015

jberry813 said: ↑

I sincerely doubt you got +3 caster with factory UCA's and 885's. Speculation is impossible. I can only help with the info given.
And 39 psi is too much IMO for these trucks. Keep in mind there is no rear sway bar from the factory.
Click to expand...

I have Light Racing UCA's. Sorry if I failed to mention that.

jberry813 · Dec 7, 2015

JeffP213[OP] said: ↑

I have Light Racing UCA's. Sorry if I failed to mention that.
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That helps. But seriously, without an alignment sheet I'm going to be shooting in the dark.

JeffP213 · Dec 7, 2015

jberry813 said: ↑

That helps. But seriously, without an alignment sheet I'm going to be shooting in the dark.
Click to expand...

Not sure if my tire shop will have them on file. I actually had my initial alignment done after I installed the lift with @ckeene9 with the original factory tires on. Haven't had one done since I went up in tire size. I was more or less going to try and go into the shop with some direction on what I wanted done, but I realize that is easier said than done without my alignment numbers from the last time I went in.

Side note - I took it to the Toyota dealership for the 15000 mile service and the shop manager told me I needed more lift on my truck and that it wasn't an alignment issue. I actually laughed in his face and asked for my keys.

Justinlhc · Dec 7, 2015

So much missing information.

What size tires? What size and offset on the wheels?

Max caster on the LCA, move camber to max positive(front bolt all the way in, rear bolt all the way out) and adjust camber and caster at upper control arm as needed.
https://www.tacomaworld.com/threads...driving-report-with-light-racing-ucas.158795/

Justinlhc · Dec 7, 2015

jberry813 said: ↑

There is no adjustment on a factory UCA or aftermarket UCA's except with Light Racing.
Click to expand...

Don't forget the baller series Icon billet arms.

JeffP213 · Dec 7, 2015

Justinlhc said: ↑

So much missing information.

What size tires? What size and offset on the wheels?

Max caster on the LCA, move camber to max positive(front bolt all the way in, rear bolt all the way out) and adjust camber and caster at upper control arm as needed.
https://www.tacomaworld.com/threads...driving-report-with-light-racing-ucas.158795/
Click to expand...

Sorry man. I've got 285/75/16 and 3.5 bs

Justinlhc · Dec 7, 2015

What width are the wheels?

JeffP213 · Dec 7, 2015

Justinlhc said: ↑

What width are the wheels?
Click to expand...

8" they're the @SCSPerformance F5's

Justinlhc · Dec 7, 2015

So 17x8 3.5 BS -25 offset and a 285/75/16. The perfect recipe for rub.

You need a good alignment guy that can take instructions. That link I posted is your best bet. If you rub after that a hammer is the only thing that's going to help you without swapping tires or wheels.

jberry813 · Dec 7, 2015

Justinlhc said: ↑

So 17x8 3.5 BS -25 offset and a 285/75/16. The perfect recipe for rub.

You need a good alignment guy that can take instructions. That link I posted is your best bet. If you rub after that a hammer is the only thing that's going to help you without swapping tires or wheels.
Click to expand...

Don't think he was asking about rubbing aside from the title.

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Alignment issues with Rubbing and Understeer

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JeffP213 [OP] I used to do mods. I still do, but I used to, too

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Alignment issues with Rubbing and Understeer

#1 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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#3 ZachPrerunner Sometimes she goes, sometimes it doesn’t

#4 jberry813 Professional Fluffer Moderator

#5 Unchained 5150 Rick

#6 ZachPrerunner Sometimes she goes, sometimes it doesn’t

#7 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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#9 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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#11 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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#13 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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#16 JeffP213 [OP] I used to do mods. I still do, but I used to, too

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ZachPrerunner Sometimes she goes, sometimes it doesn’t

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