Sway bar disconnect above 19mph?

Dr. W

Member
📛 Founding Member
Sep 18, 2024
13
26
Orange County, CA
Vehicles
2024 J250 First Edition, 1978 FJ40
I spent the weekend in Joshua Tree doing some basic, nothing fancy off-roading with my J250 FE. Let me say first of all how impressed I was with the stock off-road capabilities and comfort of this vehicle-- it cruised through a variety of conditions while keeping the family comfortable.

One feature I particularly enjoyed is the electronic stability bar disconnect. Even though I wasn't doing anything especially technical, this feature made the cabin even more comfortable by allowing the suspension to really articulate over uneven terrain. The sway bar disconnect significantly reduced the sometimes jarring back-and-forth swing that I've experienced on other off-road vehicles (including older landcruisers) moving over uneven terrain.

My only qualm is that the sway bar automatically re-locks above 19mpg. From what I've read, this seems to be a common threshold for several other off-road vehicles with electronic sway bar disconnect, like certain Wrangler and Bronco trims. I understand that the automatic re-locking is a safety feature, as allowing too much body roll could be unsafe at highway speeds. But my qualm stems from the fact that the J250 is so stable and comfortable off-road, I often found myself unintentionally edging into 25-30 MPH speeds on mellow stretches. Unfortunately the sway bar would reconnect at 20mph, and the ride quality would become bumpier. So I was stuck either driving slower than I wanted to <19mpg or dealing with the bumpy ride >19mph.

I know some people remove the sway bars altogether on dedicated off-road vehicles, but that wouldn't work for me, as my J250 is driven primarily on pavement, including highway driving with the family.

It would be handy to adjust the sway bar re-connect threshold to 25 or 30 mph. I'm guessing this is a feature that Toyota has locked down, but is there any way to adjust this speed threshold?
 
Anybody who has used Techstream or another On Board Diagnostics (OBD) kit: is the electronic sway bar reconnect speed a programmable value?
 
I spent the weekend in Joshua Tree doing some basic, nothing fancy off-roading with my J250 FE. Let me say first of all how impressed I was with the stock off-road capabilities and comfort of this vehicle-- it cruised through a variety of conditions while keeping the family comfortable.

One feature I particularly enjoyed is the electronic stability bar disconnect. Even though I wasn't doing anything especially technical, this feature made the cabin even more comfortable by allowing the suspension to really articulate over uneven terrain. The sway bar disconnect significantly reduced the sometimes jarring back-and-forth swing that I've experienced on other off-road vehicles (including older landcruisers) moving over uneven terrain.

My only qualm is that the sway bar automatically re-locks above 19mpg. From what I've read, this seems to be a common threshold for several other off-road vehicles with electronic sway bar disconnect, like certain Wrangler and Bronco trims. I understand that the automatic re-locking is a safety feature, as allowing too much body roll could be unsafe at highway speeds. But my qualm stems from the fact that the J250 is so stable and comfortable off-road, I often found myself unintentionally edging into 25-30 MPH speeds on mellow stretches. Unfortunately the sway bar would reconnect at 20mph, and the ride quality would become bumpier. So I was stuck either driving slower than I wanted to <19mpg or dealing with the bumpy ride >19mph.

I know some people remove the sway bars altogether on dedicated off-road vehicles, but that wouldn't work for me, as my J250 is driven primarily on pavement, including highway driving with the family.

It would be handy to adjust the sway bar re-connect threshold to 25 or 30 mph. I'm guessing this is a feature that Toyota has locked down, but is there any way to adjust this speed threshold?

Couldn't agree more. It makes a very useful feature almost worthless, as I have to push the sway bar disconnect button over and over again. A mile or so into a trail I just stop pushing it out of frustration.

I also find that the front trail camera turning off automatically over a certain speed (what is it, like 7mph?) basically makes it worthless except for extremely slow articulation maneuvers, which are fairly rare. All the YouTubers cream themselves over the amazing off-road camera but it's barely useable with Toyota's nanny implementation.
 
Not sure if available from other manufacturers, but 4x4 Engineering Service/AISIN in Japan sell a MCB (Motion Control Beam) kit that augments the SDS to reduce body motion at all speeds.
 
Couldn't agree more. It makes a very useful feature almost worthless, as I have to push the sway bar disconnect button over and over again. A mile or so into a trail I just stop pushing it out of frustration.

I also find that the front trail camera turning off automatically over a certain speed (what is it, like 7mph?) basically makes it worthless except for extremely slow articulation maneuvers, which are fairly rare. All the YouTubers cream themselves over the amazing off-road camera but it's barely useable with Toyota's nanny implementation.
I don’t think you can safely watch the trail cameras at a higher speed than that. It’s useful for spotting when you don’t have a spotter, but that’s the only real purpose.
 
I’m happy with it automatically re-connecting when I hit 20mph, but do wish it would automatically disconnect again like other vehicles do.

This is nothing more than a very mild inconvenience I’m equipped to handle, though.
 
Not sure if available from other manufacturers, but 4x4 Engineering Service/AISIN in Japan sell a MCB (Motion Control Beam) kit that augments the SDS to reduce body motion at all speeds.
This may be slightly off topic, but has anybody on this forum actually installed a MCB? From reading their website, the makers claim that it increases ladder frame stiffness and dampens some vibrations. My ask is to increase wheel articulation at speeds >19mph for improved off-road driving comfort, so I'm doubtful that MCB would help.
 
This may be slightly off topic, but has anybody on this forum actually installed a MCB? From reading their website, the makers claim that it increases ladder frame stiffness and dampens some vibrations. My ask is to increase wheel articulation at speeds >19mph for improved off-road driving comfort, so I'm doubtful that MCB would help.
Increasing wheel articulation reduces body motion, so both techs have a similar end goal. The MCB is a relatively new product and not sure if anyone in the US has installed it yet.
Another tech that should be helpful is TEIN EDFC 5 (Electronic Damping Force Controller) which allows the driver to adjust the damping force of TEIN LC250 shocks/struts from the cockpit to improve off road driving comfort as needed. There are some reviews on YouTube of this tech on Teslas. ICON also offers the Compression Damping Electronic Valve (CDEV) with ICON Intelligent Control (IIC) with similar capabilities for off and on-road comfort adjustments while driving.
 
I don’t think you can safely watch the trail cameras at a higher speed than that. It’s useful for spotting when you don’t have a spotter, but that’s the only real purpose.
100% not true. I had a front camera that I could have 'always on' in my Tacoma for years. I'll give you one of many examples: Climbing up a steep hill requires some speed and momentum >7mph. If the hill is steep enough, your front end is pointed towards the sky and you can't see obstacles or over hood of the truck. A front camera lets you see both the road and the crest to avoid obstacles or not go over an edge.

It was one of the first trips out with my Land Cruiser that I crested a steep hill and had to make a sharp turn at the top very quickly because the road curved after the crest of the hill and there was a drop off if I had continued straight. The front camera shut off on me and it was a bit of a closer call than I would have liked.

(No, I don't speed around on trails, I drive very conservatively.)
 
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