hodor

Hi Guys:

My first post here. Been looking for a used IS F for a while now and finally ended up getting one this weekend (2008 IS F with 12,000 miles). The owner took meticulous care of the car and you can tell when you first look at it (it looks brand new).

I test drove it and it felt good. Had it checked out at a local Lexus dealer and everything checked out there as well.

One thing I noticed this today was while making a u-turn (in either direction) and turning the steering wheel to a locked position (i.e. turning the steering wheel until I can't turn the steering wheel any further), the front end of the car seems to feel like the wheels become lopsided and causes an unusual bumpy ride (even though the road is flat).

I asked the previous owner about this and he stated this is due to the "slippage" because of the width of the tires. He also stated that the car did that the first day he pulled it off the lot and that all high performance tires that are that wide will slip a little when you turn the wheel that hard because of the camber and amount of rubber on the road surface. He goes on to say that the tires are designed to have maximum surface area in contact with the road at all times and that becomes very difficult when the wheel is turned hard because of the width and toe adjustment. When the wheel is turned that much, you are essentially dragging (or pushing), a massive amount of rubber at a very harsh angle, causing a bumpy ride.

I test drove a 2011 Lexus IS F and remember making a U-turn and not feeling anything bumpy.

So my question to you all is: do you guys experience a "bumpy ride" when making a u-turn in your IS F? Do you know what causes that?


Thanks!

darbs242

iTrader: (5)

my F doesnt feel bumpy

hodor

@Darbs242 - Even if you turn your steering wheel all the way, you don't feel any bumpiness?

Thanks for your response. I appreciate it!

darbs242

iTrader: (5)

The only time i hold it at full over is u turns and donuts and it feels fine. i have had an F for four years and no experience like that at all

vbb

iTrader: (3)

I know exactly what you're talking about, OP and yes, my '09 does the exact same thing. When I make a full locked turn at a low speed (I do a particular left handed U-turn at my office parking lot almost every morning to get into my spot) and it feels like I've momentarily driven over a few of acorns or something. Not major bumps mind you, but just like I've driven over some slightly uneven pavement. It happened when my car was bone stock and it happens now that my car is lowered too... so the aftermarket suspension/wheels have nothing to do with it.

I've never actually been concerned enough to ask though, but it sounds like your previous owner's explanation is reasonable. Now I'm curious!

lorenr

iTrader: (1)

I have a 2011 and I notice the bumpiness as well when the steering wheel is locked. I think it is normal and the result of the drive wheels pushing the front of the car causing the front wheels to plow. These cars have a lot of power and will push anything.

My pickup has a locking differential and you ought to feel it plow the front on a tight turn. All in all, no big deal though.

Loren

hodor

So, then, when you guys feel this bumpiness when you turn, will this cause damage to the steering column or tires at all?

vbb

iTrader: (3)

I can't see how, unless you're TRYING to break something.

ISFPOWER

iTrader: (20)

check the inner tire wear. mine did this when my tires were bald/choppy in the inner front tires.

ScottNY

My 2013 does this at very low speeds, e.g. just over idle, at full steering lock. Only happens with stock tires, not with the snows, so I think it's tire slip you're feeling.

flowrider

iTrader: (9)

Welcome to the site. Look Here:

https://www.clublexus.com/forums/is-...n-turning.html

Lou

hodor

Thanks Lou!!!

JKweezy

To me it was more like a scrubbing sound... I recently switched out the LCA bushing to defeat the inner tire wear... but I did notice the scrubbing sound went away but then again I did put new tires on the day after I installed the bushing... I didn't make note if the scrubbing sound was still there with the old tires b/c I wasn't expecting the scrubbing sound to go away... but no one else who has changed out the bushing has confirmed if their's went away too...

IsfClyde

normal operation. mine also does it

hodor

Anyone know if this can be fixed? If so, how?

This is causing an uneven wear on my front tires (i.e. - the outside of my tires are wearing out before the tread in the center is).