LX570 Suspension Question

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H

highrock95

Joined
Oct 4, 2018
Threads
3
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29
Location
Lexington, NC
Quick question for you guys.... We've had our LX570 for about 3 weeks now and absolutely love it (it's the wife's everyday driver). Still trying to get used to everything control wise (nav/ac/radio/etc....wife had been driving Jeep Gr Cherokee's for years now).

One question I do have, there seems to be a bit of a rumble in the suspension at higher speeds only when going over bumps or rough patches of highway (basically anything over 40mph). You can slightly feel it in the steering wheel and in the seat of your pants. It's not terrible, but it's noticeable..... I know coming from the Gr Cherokees, it just feels different. I'm guessing this is likely totally normal, but just wanted to get thoughts as you guys know these vehicles up and down.

At slow speeds it's rock solid (best I've seen in a vehicle actually). We live on a long rock/gravel/dirt road and it's amazing there.
 
Is the vehicle completely stock?

Not sure what you're describing with the rumbling. The LX is generally incredibly well refined as it's a Land Cruiser, but even more so because it is a Lexus, and has to meet Lexus levels of refinement. One thing is that it's a body on frame vehicle, so there is indeed some very low level secondary motions as a result of that architecture. But one would have to be very sensitive to notice it. Have you had another body on frame/truck vehicle before? The Jeep Gr Cherokee, I believe is unibody? Still, I'd expect the Lexus should be well refined beyond that.

If you still suspect something else is going on... What year is your Lexus? Some earlier models had some known issue going on with subcomponent mounts resulting in some resonance at certain RPMs. Particularly when climbing hills. It is document in a service bulletin.

If you can characterize the rumbling more, that would help. And when it happens.
 
TeCKis300 said:
Is the vehicle completely stock?

Not sure what you're describing with the rumbling. The LX is generally incredibly well refined as it's a Land Cruiser, but even more so because it is a Lexus, and has to meet Lexus levels of refinement. One thing is that it's a body on frame vehicle, so there is indeed some very low level secondary motions as a result of that architecture. But one would have to be very sensitive to notice it. Have you had another body on frame/truck vehicle before? The Jeep Gr Cherokee, I believe is unibody? Still, I'd expect the Lexus should be well refined beyond that.

If you still suspect something else is going on... What year is your Lexus? Some earlier models had some known issue going on with subcomponent mounts resulting in some resonance at certain RPMs. Particularly when climbing hills. It is document in a service bulletin.

If you can characterize the rumbling more, that would help. And when it happens.
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Totally stock....2019, only a few weeks old.

Rumble is probably not the best wording, but not 100% how to describe. More like a secondary "bounce" from the shocks after going over bumps (sort of like what you feel with bad/worn out shocks). I'm still guessing this is totally normally, and just something I'll have to get used to. May run by our dealer and drive another LX to make 100% certain.

I'm familiar with body on frame....my everyday driver is 2500 Ram with a Cummins. And we've owned several Jeep Wranglers and a couple Tahoe/Denalis in the past.
 
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That's useful. Congratulations on a brand new 200-series!

Few thoughts.

The new LX's have very low profile tires. Is your impressions possibly a result of that?

What setting do you have the suspension in? In sport/firm, there can be too much compression resistance such that the suspension is still legged with more impact harshness. Or is it in soft, and too soft?

Tire pressure may be another thing to check. I don't know the target pressures for the newer wheelset, but check the door jam and inflation pressure.

This is reaching, but there's been isolated cases of dealerships not properly prepping vehicles and leaving suspension isolaters in the coils.
 
Wheel/tire needs balancing?
Take it back to the dealer.
 
TeCKis300 said:
That's useful. Congratulations on a brand new 200-series!

Few thoughts.

The new LX's have very low profile tires. Is your impressions possibly a result of that?

What setting do you have the suspension in? In sport/firm, there can be too much compression resistance such that the suspension is still legged with more impact harshness. Or is it in soft, and too soft?

Tire pressure may be another thing to check. I don't know the target pressures for the newer wheelset, but check the door jam and inflation pressure.

This is reaching, but there's been isolated cases of dealerships not properly prepping vehicles and leaving suspension isolaters in the coils.
Click to expand...

Tried all 3 settings, and seem to get the same result no matter the setting. Tire's are right at 36psi all around.

I'm really thinking it's just how the LX is, and something that I'll get used to. Wife does not even notice it (and truthfully I tend to be a bit picky in all reality). It's really fairly minor and we love the vehicle overall.

May still run it by the dealer at some point and have them do a quick check over everything.
 
highrock95 said:
Does not seem to be tire balance related. It's perfect on smooth, paved areas.
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I mention this because you said it only occurs over 40mph. Balance problems become more pronounced with speed.
 
FinallyGotOne! said:
How many miles? If many (100k?), and the AHC fluid has not been flushed, you'll experience a deteriorated ride quality - especially on rebound.
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It's brand new....only about 3 weeks old. But rebound is exactly the wording I was looking for. Seems like rebound takes place over a few cycles of the shocks, versus one cycle, so the rebound feels like a slight shake after the initial rebound over bumps. Maybe a good way to state it is that going over a bump feels a little like going over a set of railroad tracks.

Nothing I can video, as there is really nothing to see or hear. You can only feel it.

It seems more prevalent at higher speeds, which is why I mentioned the speed thing...but I'm positive it's not a tire issue.

We've owned quite a few different cars, but really nothing with a suspension I would consider as "plush" as what the LX feels like, so I'm still thinking this is likely nothing at all but normal characteristics. But I'll get the dealer to check it out when we can run it by.
 
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^^^. I think you nailed it with just the different feeling of the super plush suspension. When I got mine (new in 2013) came from a G500 and had to get used to the softness.
 
@SWUtah is right. I drove 11 LX570s to figure that out over a few years. You need XT truck tires not passenger car tires to get rid of that bumpiness. I bet e load rated will be even better. With KO2s I didn't notice a major difference in the 3 comfort modes but I preferred comfort.

I ended up buying my Land Cruiser over an LX due to that weird bumpy issue. In retrospect I am happier as the springs/coilovers make mine a drivers car. To me the way the LX disconnects you from the road and soft supple ride make it passenger orientated. I ended up spending $10-15k more for the LC if you include suspension upgrades over comparable LX. I don't think I would have been comfortable putting sliders/rock warrior wheels with the big L on the back (Lexus does have a particular class about it). The LX570 is more eye catching in stock form than the stock LC 2008-2015 IMHO. Every morning I'm checking out my 2 neighbors with white LX570s on their driveways. The nice thing about the LC is it feels understated and inconspicous.
 
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