smokyis350

iTrader: (21)

I got alignment for the 4th time from a reputable shop that specializes in modified cars. My inner tread wall on my tires are usually toast in 20k miles. In 5k miles, I notice my tires are having uneven tread wear again.

The specialist always adjust my camber/toe into "spec." But into spec on my paper is about 0.17 degrees. If I tell them I want zero toe or very close to zero, would that help fix the issue? My camber is approximately -1.8 to -2.2.

Sango

iTrader: (10)

Could you show us the actual report?

Just curious what is the camber in degrees?

my1s250

iTrader: (1)

my tire guy said its normal for these kind of car and there is a thread on it in the isf forum .....only thing you can do to slow it down is to dismount and remount the tire this way it gets worn out evenly instead on one side

Sango

iTrader: (10)

Sounds like alignment problem. With mine and my friend who has an IS-F, we do not have inner wear, but it's outerwear which is expected with the suspension systems the IS has. These are on factory shocks.

Yes, the dismount/remount tire is an option if necessary.

NastyIS

iTrader: (1)

I had mine set at zero toe. I'm at about 10k on the tires and no inner wear whatsoever. The only issue I've had was the car pulled to the right a bit. I resolved that by running about 3 additional lbs of air in the right tire. I can't speak for anyone but myself, but I tried it and I'm happy I did.
BTW, before I did it, I phoned a local tire shop and the owner told me I was crazy and the car would not drive right.... did I mention that he feeds his family by selling tires?
Try at your own risk, but again, it works for me.

smokyis350

iTrader: (21)

Here is my print out:

mong

iTrader: (4)

your setting seems good. I had 0.04FR/0.04FL degrees and for the rear 0.12RR/0.12RL degrees. I was at 14k mileage with that setting.. with even wear

Virulent

iTrader: (2)

You can adjust your tire pressure. I have inner wear on my tires too when I was running them at 36 psi, so I bumped them up to 42 psi. Seems to have slowed down the inner tire wear.
You know how it is, the higher the pressure, the more wear on the middle part of the tire, the lower the pressure, the more wear on the outer part of the tire. Just have to find the right pressure zone where you get even thread wear.

Jzsicklexi

iTrader: (3)

Mine were shot in 8500 miles. I just got new fronts and need to get back in and set the toe to zero or as close to as I can as well.

Toymota

You should check out these IS-F threads:
https://www.clublexus.com/forums/is-...eo-inside.html
https://www.clublexus.com/forums/is-...alignment.html

Basically they say the bushings are too soft so the front tires dynamically toe out when braking causing the inside tire wear.

It also depends on your driving style. If you do lots of braking in the city or track, you will destroy the insides of the tires. If you do mostly highway driving with little braking, you won't see it as soon, but will eventually at maybe 30k+ miles because you still need to brake some time.

The static alignment is only part of the story, mostly affecting tire wear when you are not braking such as for mostly highway drivers.

smokyis350 had some toe out before, on the front left, which will cause inner tire wear in the static case on top of the dynamic braking toe out.

If you set zero toe, it may stop the wear in the static case such as if you drive mostly highway, but you will still get inner wear from the braking toe out.

If you set toe in to try to balance the braking toe out, you might get OUTER wear in the static case. My car was like this from the factory. The toe in was actually over the top end of the spec. I drive mostly highway (static case) so I was seeing the outer wear, but it was still not enough to balance the braking toe out so I got inner wear as well.

So I would recommend to just set toe for the static case, right in the middle of spec, which is 0.08 degrees toe in. Zero toe is also within spec so that's fine.

If you do lots of braking, you might need to consider the FIGS bushings.

Sango

iTrader: (10)

Looks like you're alignment still needs to be tweaked since the camber is not in spec.

The place where I get my alignment done at, I have everything in spec for the IS I have for both RWD and AWD and the only wear I get is outer wear (scalloping and outer cupping). The tech said that is normal for this kind of suspension setup for the IS.

Interesting, my friend who owns an IS-F, didn't get an alignment yet and he's also getting outer wear as well.

smokyis350

iTrader: (21)

I don't think my camber could be tweaked since I am lowered about 2.5 inches, unless I get a camber kit.

Sango

iTrader: (10)

^
Ahh, gotcha, that would change the story. The report looked like to me it was referring to as the factory sport suspension. In that case since you are lowered with aftermarket, then yes you would want to consider a camber kit.

If it is factory, you would not need one.

SC3coupe

iTrader: (4)

Just remember toe-out chews up the inner edge of the tire quick, kind of like reaming the edge of it.

On a car with too aggressive inner wear I usually ask for a bit more toe-IN, to alleviate things a little bit. such that not everything is focused on the inside of the tire.

The toe-in is not as good for turn in response but don't think you can notice much.

At the end of the day most technician try to give you 0.00", but if you do 0.12" + for each side, it's still within factory specs.

SeanIS350

iTrader: (2)

+1 on trying to run the tires at a higher psi. That was exactly what my alignment guy told me after my alignment when he aonly had to make minor adjustments eventhough I was getting inner tirewear in the front. I'm running 40 psi in front and so far so good on my new set of tires but I only have 2k on them so far so too early to tell.