Mostly stock, ride bouncy like a bobble head?

[TeCKis300]

I'm glad to hear others chiming in. I read so many threads about the K02 prior to purchasing, I'm surprised I didn't come across this issue mentioned. If I believe I have need for the K02 robustness, is there an aspect to this that is suspension related that is addressed by swapping to another suspension like BP-51? I'm trying to wrap my head around the variables.

There's several variables at play that perhaps create something more of an issue than each contributing factor.

KO2s have a long list of off-road credentials including durability, but the trade-off is generally a stiff ride. They are the stiffer end of the spectrum for AT tires.
- In a size that generally requires higher inflation pressures. (For example, a LT285/65R18 requires ~5PSI less for the same load)
- LT-E load rated tire
- With the misinformation of RCTIP that is gospel

To your question, BP-51 might address some things, but may very well lead to an even stiffer ride as they are usually paired with higher spring rate coils.

Simple answer, run ~38-40 psi for a LT285/60R18.

If laden heavy for a trip or towing, apply common sense and possibly increase tire pressures. If this seems suspect as a legitimate strategy, OEMs do recommend exactly this to strike a balance ride quality with load handling. From the LX570 manual:

 

[kohai]

What did you drive before the LC? If you came from a german sedan or SUV you’ll notice a bit of a difference with the 200.

Noted. I do have more sporty vehicles but also a GMC truck and had a 4runner prior.

There's several variables at play that perhaps create something more of an issue than each contributing factor.

KO2s have a long list of off-road credentials including durability, but the trade-off is generally a stiff ride. They are the stiffer end of the spectrum for AT tires.
- In a size that generally requires higher inflation pressures. (For example, a LT285/65R18 requires ~5PSI less for the same load)
- LT-E load rated tire
- With the misinformation of RCTIP that is gospel

To your question, BP-51 might address some things, but may very well lead to an even stiffer ride as they are usually paired with higher spring rate coils.

Simple answer, run ~38-40 psi for a LT285/60R18.

If laden heavy for a trip or towing, apply common sense and possibly increase tire pressures. If this seems suspect as a legitimate strategy, OEMs do recommend exactly this to strike a balance ride quality with load handling. From the LX570 manual:

View attachment 3689922

Thanks, this is helpful. I'll drop the PSI and give it a try tomorrow.

 

[M1911]

The “bit of play in the steering” is not normal and could be caused by alignment being off.

The 200 wanders a bit on the highway and requires frequent small inputs. I wouldn't describe it as "play" in the steering, but highway tracking isn't great, even with a good alignment. My wife's Mercedes C300 tracks straighter.

So what he is experiencing may or may not be due to alignment issues.

 

[bloc]

PB-51s would also give you a minimum of about 2" lift, which would then make your 285/60R18 tires appear quite small. And yes as Teckis said would stiffen the suspension portion of your ride, even if it would cut down on the oscillations from the tire spring rate.

These things tend to snowball.

 

[gaijin]

Thanks, this is helpful. I'll drop the PSI and give it a try tomorrow.

Please bear in mind that reducing the tire pressure decreases the tire spring rate, i.e. makes the tire softer and more "bouncy" or "floaty" - not likely to be a solution if the problem you are trying to solve is a bouncy, floaty, bobblehead-like ride.

You would also be reducing your tires' Load Limit to less than what Toyota requires for the OEM tires supplied with your LC200 - so great for experimental purposes, but be cautious about long-term or high-speed use at a lowered tire pressure.

The TRA (Tire and Rim Association) and tire manufacturer's specs dictate that LT-Metric tires like yours should not be operated on the road at a tire pressure under 35psi to prevent structural failure due to excess heat build-up. So, even if you recognize the decreased Load Limit of a reduced tire pressure, be wary of any testing you do should be above 35psi.

HTH

 

[kohai]

Please bear in mind that reducing the tire pressure decreases the tire spring rate, i.e. makes the tire softer and more "bouncy" or "floaty" - not likely to be a solution if the problem you are trying to solve is a bouncy, floaty, bobblehead-like ride.

You would also be reducing your tires' Load Limit to less than what Toyota requires for the OEM tires supplied with your LC200 - so great for experimental purposes, but be cautious about long-term or high-speed use at a lowered tire pressure.

The TRA (Tire and Rim Association) and tire manufacturer's specs dictate that LT-Metric tires like yours should not be operated on the road at a tire pressure under 35psi to prevent structural failure due to excess heat build-up. So, even if you recognize the decreased Load Limit of a reduced tire pressure, be wary of any testing you do should be above 35psi.

HTH

Thanks! I lowered PSI to 42 today and drove on the freeway. It seems better. The tire guy at the dealer today recommended 38-40 if I'm not towing. I appreciate everyone's input.

 

[TeCKis300]

Thanks! I lowered PSI to 42 today and drove on the freeway. It seems better. The tire guy at the dealer today recommended 38-40 if I'm not towing. I appreciate everyone's input.

Fortunately tire pressure is easy to manipulate so there's no commitment to any test. Exploring the various pressures will help you understand whether this dial will or will not help solve your issue.

So you have a calibration as to how much you can turn this dial. Tire pressure guidelines as stated in the inflation tables have margins built into them from tire manufacturers themselves. I mean, consider how many people out there are actually underinflated, and not staying on top of and checking pressures regularly?

These pressure are also spec'd for full performance considering various factors. Meaning max load
- at rated max speed
- on a likely hottest day
- driven at some rigorous performance level

Long way to say there is ample margin for tailoring and you're nowhere near a critical threshold by bumping the pressure down a bit.

 

[isthatalexus]

The hand-to-hand RCTIP combat is why I came to MUD. It's also why I'm never leaving.

Not same or equivalent, but the feels tend to match golf course avi 'rising'. (pls don't ban; is compliment)

 

[ryanCA]

The hand-to-hand RCTIP combat is why I came to MUD. It's also why I'm never leaving.

same here !!!

I didnt realize how contentious things were between certain members!

Days of your Lives on Mud