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Old 01-14-2022, 04:12 PM #16
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Finally, The Only MTS Video You Need to Watch! Multi Terrain Select Explained.
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Old 01-14-2022, 04:24 PM #17
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Quote:
Originally Posted by Old Tanker View Post
I'm happy with my ORP, but if I were to do it again I'd get an SR5 and put the difference into front and back air lockers. I don't need all these options just to figure out how to get through a stretch of trail. 4Lo, two foot driving, and lockers would get it done without needing a reference card with a flow chart.

I'm not certain that MTS only changes throttle sensitivity. I think it tunes A-Trac a little more wheel spin for mud where you don't want the wheels to stop at the first loss of traction. Toyota's website describes it as "With five modes to choose from, this system helps regulate wheelspin by automatically adjusting the engine throttle and traction control."
I agree. You can get the vehicle in a good off camber situation to see this for yourself but there is definitely a difference between mud/sand and rock as far as how aggressively, (quickly), ABS works to turn the wheel on the ground.

To clarify something that was said earlier it's not that I don't believe MTS makes any difference, its just that it is not as useful as the literature makes it seem. A single button for ATRAC is sufficient IMO. As has been said the main benefit for me of MTS is the ability to turn on mud sand in 4hi and the rock position is a little more aggresive than ATRAC in my experience. In the offroading I've done its hard to imagine when I would want loose rock or mogul as I would just want maximum traction in 4lo.

Don't get too caught up in the weeds on this stuff, play with it but know that at the end of the day ATRAC + locker trumps everything but a dual locked vehicle, (suspension travel and tires being equal). Also don't think that ATRAC is a magic button, Landrover has been doing this since the discovery II(?) and Jeep was doing it in at least 2007, and now this brake lock technology is almost ubiquitous in the offroad world.
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Old 01-14-2022, 05:26 PM #18
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Originally Posted by downshift View Post
Seems to me that there is a very narrow window where MTS would be useful. There's a very small gap between being able to get through an obstacle without MTS and not being able to get through the obstacle at all.
This is correct. It's nothing special. A ton of SUVs and crossovers now have similar systems and it's nothing more than a fancy traction control system. Mud, Snow, Rock, loose gravel, sand, etc. settings. They all just limit or allow more wheelspin by cutting down on the throttle. Think of it like turning on and off traction control in any other vehicle, but with different levels in between. I.e. if you are driving a front wheel drive Honda in the snow and traction control is on. Good luck going anywhere because power keeps getting cut. Turn it off and it's wheelspin city to freedom.

Lockers are really where it's at if you really want traction. A-Trac is just a brake lock diff as the others have said. It's good, just like on Jeeps with open diffs, but it's not even close to a locker.

And crawl control is just a computer driving for you which is cool to some and can apparently get you unstuck sometimes. I've personally ever used it.
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Old 01-14-2022, 06:42 PM #19
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Thanks everyone. This has been very informative. I was very curious as to how MTS worked mechanically but also how it differed from ATRAC. Now I think I understand.

So let’s see if I have this right.

A-TRAC uses the braking system to stop free spinning wheels in order to force torque to the wheel that has contact with the ground which provides greater traction. It seems A-TRAC is most useful in helping a stuck vehicle get unstuck and travers very difficult and slippery terrain at very low speeds.

MTS provides optimal traction for the terrain selected by a combination of throttle control and regulated wheel spin when it’s desired. Wheel spin is controlled primarily by throttle control and to a lesser extent wheel breaking. MTS is most helpful for longer travel distance on rough and slippery terrain and at higher speeds than A-TRAC.

Does that sound about right?

Last edited by Lexington; 01-14-2022 at 06:48 PM.
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