AHC Paranoia?

Do you have AHC PARANOIA? Are you worried about system breaking?


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For those of you with AHC (LX570), do you worry about it going out? Do you adjust your driving NOT to hit bumps or potholes at high speeds to protect the system?

I have a LX470 and used to have AHC paranoia until I finally stripped and replaced it with ARB suspension. I know AHC was improved greatly in 200 but I can't imagine it being perfect. I don't mind paying $4000 every 200k miles on suspension but I want to feel 100% confidence I am indominable.
 
AHC is the best suspension I can imagine having on a vehicle of this type, for the kind of use I require.
 
Nope. Wondered when this question would come up after 3 different people managed to kill theirs in the last month (I followed @radman s guide last year and didn't have any issues with replacing the fluid). The 2 ways it seems to primarily fail on 200s is either lines rusting on salty trucks or user error replacing the fluid. Sure there's some globe replacement (oddly enough they're cheaper than 100s) and shock replacement but that doesn't seem as common.
I get a lot of enjoyment from showing LC people what they're missing out on. The comfy ride and dynamic height is too damn fun.
 
I just dropped the pump and fully disassembled it, full confidence in the system.

Proceed with sending it.

But seriously, it's awesome how dynamic the suspension is. It's adjusting rebound/compression multiple times per second and feels at home on the fwy or hitting 50-60mph off road.
 
If you send it, stuff will break, so no matter what we’re all going to be faced with some sort of repairs for driving hard. I don’t think ahc is any less viable for long term use than other types. There are remarkably few stranded tow off trail stories for ahc (just a couple). Probably the same number as failed shock/spring/strut.
Of course we’re coming up on 13 years in service for the oldest of the 200 so I’m sure there will be more failures of all types, and even more as the low $ rigs get built and busted.
 
The only disadvantage that I’ve found is the limited selection for sliders. Trailering alone makes it a no brainer. No air bags, no wdh hassles and headlights are always aimed right. As mentioned, access and egress is a breeze, I’m not the guy that enjoys climbing up into my vehicle. Total confidence on my part.
 
I obviously didn't trust it on mine, but the way I drive is probably in the .1 percential of all LX570s.
 
The system continues to impress and is worth any potential or perceived maintenance. It's broad capability, performance, and durability is beyond reproach compared to anything else available. Real maintenance (60k flush) is frankly insignificant for the durability and long term like new performance it delivers. We know enough about the system today that even the blue moon reported issue, is not particularly hard or expensive to fix. With costs and availability of components as part of the OEM network better than any 3rd party component out there. Weeping shocks, worn globes, rusted line, pump failure to prime... that last pump issue is seemingly more and more to be caused by improper servicing rather than any inherent fault of the system. We seem to be on the cusp of understanding and resolving it too.

For those that have experienced true performance coilovers
- Imagine having to deal with 3rd party quality, fitment, support issues. We see that on the regular in these forums.
- Rebuilds after 20-50k. Days to weeks downtime? I've been there for my fun cars. I wouldn't put up with that for my LX workhorse
- The required cost of entry for an enthusiast suspension on the LC is likely way more than the lifetime service or repair cost of the AHC system. With AHC easily up to most enthusiast pursuits, stock. And we know AHC will outlast any by at least 2x or more, furthering its cost advantage.

It's like worrying about the 5.7L motor. It's just not worthwhile as we know Toyota/Lexus engineered it to the highest levels of robustness. Will it need service or minor repairs every now an then? Possibly. As any mechanical system could. In my mind, it's just not worth worrying about. I worry more about 3rd party parts as it's far far likelier they will fail compared to OEM parts. What I spend time worrying (fixing?) more is my German car components, OEM or not.
 
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Thanks guys, I had some PTSD with my previous suspensions (LX470, Ford E550, S600) and just wanted to triple check. Im thinking of getting a second 200 LX570 with 35s this time for passenger comfort. I just want to make sure before I lost my mind on my LX470 with AHC repairs. I was going to the shop weekly for it. Until mechanic suggested to remove it.
 
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Potholes at high speeds can muck up any suspension. Having said that, I have found that I am likely to damage lots of other things before my suspension gives out.
 
Do I have any paranoia after doing some research? No. If it was an air suspension - different ballgame, but for a system that can be used and abused for a decade plus in thousands of rigs with relatively few failures, I am really, really impressed with it and fall into the @nwfl4runner and @chalice camp - still gonna sends it!

Here are some extra thoughts for anyone trying to fall asleep in the Americas...

Are there some other cool options out there? Sure!
- Spool valves - I really like the Multimatic spool valve shocks in the ZR2 and ZL1-1LE. They perform great for their intended use and I love the fact that they are a mechanical, contained unit! But those are apples to oranges comparisons with AHC. Spool valve shocks are $ to replace compared to AHC shocks and globes, and while they can be built to respond reasonably well across a range of conditions (like the ZR2), when tuned to get the most out of them, like in the ZL1-1LE, a lot of people find them difficult to live with outside of their intended environment (i.e. track days and super twisty, smooth canyon roads for the 1LE are fun while daily driving, for most, is a pita). And you can't play with the height on the fly.
- Air suspension? I have only tried the Land Rover (D5) and Cayenne (958), and while they are nice on the road and okay for low speed crawling, from my admittedly limited sample size, I think the ride on lifted air sprung suspensions at speed, offload, is crap.

Twilight zone between a daily and a dedicated pre-runner
My other thought on the AHC as I looked at it more, and have started to ... explore the envelope a bit... If I can drive it across the country and take it on some fun desert roads up to 50 or 60 (Mojave at 50-60, not Baja whoops at 80), I am probably close enough to the limit of what I want to do in a street driven daily driver now than I am older and have a family. Now, would I pre-run an LC200 with a nice King 2.5 or 3.0 suspension and no cage?

- At the same speed as the AHC? Sure, and with good valving it will work better, off road, in that scenario, hands down. But I don't think I am going to enjoy a pre-runner setup as much on the trip to and from the desert, which is a few thousand miles each way. My only caveat on this caveat - with KDSS I imagine the ride on an LC200 set up for pre-running is markedly different than most other vehicles set up for whoops.
- At 75 MPH or more? Eh - I've already done that in vehicles that didn't have the same passenger cab strengthening from the factory BUT somewhere between 55 and 75, which may not feel much different ride wise with the right valving and build, I think the desert starts to move by your window more quickly and unexpected surprises can catch and role you with one mistake (or stroke of bad luck). I've been in a Raptor (great fun), Y62 Patrol (wasn't valved for it), a 150 series (slower than the Raptor but well set up), and a Hilux (not prepared but took a licking and kept on ticking) for a few hundred miles in total going between 60 and 80 mph on everything from smooth desert roads to rutted out 'paths' in the Himalayas and mild whoops in the desert (not bigger Baja or SCORE style stuff to be clear). While its fun for a short stretch on a road that you or a co-driver know, I wouldn't do serious pre-running at 75+ in a non-caged, street driven vehicle again after watching other people who are better drivers catch an unexpected whoop/drop/obstruction that rolls them and lands them on their roof.
 
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Zero chance without AHC that my 85 and 92 year old mother and mothe-in-law could ever get in my truck.

Hmmm…
No mother-in-law if we choose an LC with no AHC?

Clearly… I am a GENIUS. 😂
 
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Potholes at high speeds can muck up any suspension. Having said that, I have found that I am likely to damage lots of other things before my suspension gives out.

I havent had any issues and have 100k miles on my icons (knock on wood). I drive like im in Baja wherever possible. I love getting fully airborne in my 200. I grew up with a bmw 325is which I treated like a rally racer 140mph down empty country roads in between corn fields trying to get maximum hang time.
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Zero chance without AHC that my 85 and 92 year old mother and mothe-in-law could ever get in my truck.
Thats my biggest regret for my 70 year old parents in my LC, one of the reason im thinking of LX570 as second 200 to replace 100.
 

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