TMW
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2016 Tacoma Crawl Control
Just what David K wanted and others need for Baja.
http://truckyeah.jalopnik.com/watch-the-2016-toyota-tacoma-r...
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ncampion
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That's pretty impressive!
Living Large in Loreto. Off-grid and happy.
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David K
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That is how A-TRAC works too. I think the same components are used for crawl?
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durrelllrobert
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I've self rescued several 2x vehicles from up to the axels sand by simply removing the spark plugs to eliminate compression and then using the
starter motor/ flywheel interface, which provides a ratio of between 15:1 and 20:1 + the ratio of the manual transmission gears and the rear end.
Of course the Tacoma design doesn't reure you the carry a spark plug wrench to remove and reinstall the plugs but I'm sure their design costs a lot
more.
Bob Durrell
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durrelllrobert
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I notice that in the crawl mode the wheels are turning in reverse. Does A-TRAC do that too?
Bob Durrell
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BeemerDan
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Quote: Originally posted by durrelllrobert  | I've self rescued several 2x vehicles from up to the axels sand by simply removing the spark plugs to eliminate compression and then using the
starter motor/ flywheel interface, which provides a ratio of between 15:1 and 20:1 + the ratio of the manual transmission gears and the rear end.
Of course the Tacoma design doesn't reure you the carry a spark plug wrench to remove and reinstall the plugs but I'm sure their design costs a lot
more. |
I've done it in similar way with a VW, but just pulled the coil wire
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AKgringo
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My Kia does just about the same thing! (shovel and jack sold separately)
If you are not living on the edge, you are taking up too much space!
"Could do better if he tried!" Report card comments from most of my grade school teachers. Sadly, still true!
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BajaBill74
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My Prius doesn't exactly do that, but gas consumption is so little, I could sit there and spin the tires for 24 hours. 
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Udo
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As DK stated:
If we use our traction control to begin with, it never would have gotten stuck!
Most of us who have off-roader for many years, know how to "rock" the vehicle to get it on top of the sand.
Udo
Youth is wasted on the young!
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David K
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| Quote: Originally posted by Udo | As DK stated:
If we use our traction control to begin with, it never would have gotten stuck!
Most of us who have off-roader for many years, know how to "rock" the vehicle to get it on top of the sand. |
Nothing beats deflating the tires at least 50%. Just don't spin the tires in the sand!
Since 2009, the Tacoma (and before on other models) has had traction control. This is a limited slip system called 'TRAC' and there are choices with
or without engine output regulation (TRAC ON/ TRAC OFF). Off road, the TRAC OFF mode is a stronger limited slip. In H4, it is the standard mode to the
2011 model Tacomas, and 2012+ requires a quick push of the VSC button.
TRAC (or TRAC OFF) works all 4 tires in 4WD HIGH.
The Off Road TRD Tacoma has A-TRAC in 4WD LOW. The best way to describe A-TRAC is to call it front and rear 'automatic lockers', as it is a higher
level of limited slip than TRAC/TRAC OFF. A-TRAC actually matches tire rotation across the axle rather than simply slowing a spinning tire.
The non-Off Road Tacomas who want some degree of traction control in low range can do a mod, called the 4 LO TRAC MOD (or Yellow Wire Mod). This will
trick the Tacoma into thinking it is in H4 while you are really in L4 (low range). That gives you TRAC (TRAC OFF) limited slip in low range. It is a
big advantage over the normally open differentials for the non-Off Road TRDs.
If you have A-TRAC, just push the A-TRAC button the first time you go into L4... and leave it that way.
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PaulW
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What kind of mechanism is used to vary the slip from side to side? Variable limited slip?
I understand the wheel sensors can compare the rotation of side to side, but what is done with the info? (Historically this was done with the brakes -
not the diff).
Most of us are familiar with lockers which allow easy or full throttle use of both tires/axle at once. And many of us thought that method was the
ultimate traction device. We commonly use those select-able lockers in front and rear.
The video sure places the stuck truck in a favorable place - meaning its pretty easy to get unstuck when you drive down hill. Gravity is a big deal.
Flat is much more difficult and most of the time low air pressure is the only solution regardless of how many tires have power.
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| Quote: Originally posted by David K | | Quote: Originally posted by Udo | As DK stated:
If we use our traction control to begin with, it never would have gotten stuck!
Most of us who have off-roader for many years, know how to "rock" the vehicle to get it on top of the sand. |
Nothing beats deflating the tires at least 50%. Just don't spin the tires in the sand!
Since 2009, the Tacoma (and before on other models) has had traction control. This is a limited slip system called 'TRAC' and there are choices with
or without engine output regulation (TRAC ON/ TRAC OFF). Off road, the TRAC OFF mode is a stronger limited slip. In H4, it is the standard mode to the
2011 model Tacomas, and 2012+ requires a quick push of the VSC button.
TRAC (or TRAC OFF) works all 4 tires in 4WD HIGH.
The Off Road TRD Tacoma has A-TRAC in 4WD LOW. The best way to describe A-TRAC is to call it front and rear 'automatic lockers', as it is a higher
level of limited slip than TRAC/TRAC OFF. A-TRAC actually matches tire rotation across the axle rather than simply slowing a spinning tire.
The non-Off Road Tacomas who want some degree of traction control in low range can do a mod, called the 4 LO TRAC MOD (or Yellow Wire Mod). This will
trick the Tacoma into thinking it is in H4 while you are really in L4 (low range). That gives you TRAC (TRAC OFF) limited slip in low range. It is a
big advantage over the normally open differentials for the non-Off Road TRDs.
If you have A-TRAC, just push the A-TRAC button the first time you go into L4... and leave it that way. |
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David K
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There is a difference between lockers and A-TRAC and the Tacoma (Off Road 4WD) since 2009 has both systems (locker on the rear differential only).
Lockers spin the tires equally and is brute force gun-ho power.
A-TRAC prevents spinning and thus favors the tires with traction to move you. A-TRAC is thus slower and will take a few more seconds to climb or get
through a problem.
In the end, both systems will get the truck through. The advantage of A-TRAC is that the differentials remain open, so steering is not difficult. This
is key on tight trails where the guys with lockers (specially front lockers) need to keep turning them off and back on in order to steer through tight
turns. The A-TRAC is on standby until there is tire spin, then it works, automatically.
I do not know the CRAWL system fully, so I can't say what is different about it, other than selecting various terrain conditions with it, so it reacts
differently with each.
In sand, when my truck was new, I tested the A-TRAC for getting unstuck... out by Bahia Santa Maria, I drove onto the beach by the bay with tires at
32 psi, in H4 (with 'TRAC' Traction Control) and was amazed that I didn't need to deflate as before without TRAC. To see if it was just odd conditions
on the sand and not the new limited slip system, I disabled TRAC (VSC OFF MODE) in H4 and promptly got stuck in the sand!
Now, I then switched to L4 with A-TRAC on (tires still at 32 psi) and the truck slowly creeped out of the stuck (like the video of Crawl showed)... I
then went back to H4 with TRAC and continued to drive about! Photos in my Jan. 2010 trip report to Rob & Connie's place.
The truck did not have a heavy load and on the next trip onto Shell Island, heavily loaded, I did need to deflate as the truck was digging in too
much, even with A-TRAC. 15 psi made driving easy in H4 on Shell Island's bottomless sand/shell mix beach.
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TMW
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Paul it uses the brakes to reduce the spin on the wheel without traction. Also note the Tacoma rear electric locker is only locked in 4L but as David
said above there is a method of wiring it for 4H. If locked in 4H A-TRAC may be non-op.
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David K
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| Quote: Originally posted by TMW | | Paul it uses the brakes to reduce the spin on the wheel without traction. Also note the Tacoma rear electric locker is only locked in 4L but as David
said above there is a method of wiring it for 4H. If locked in 4H A-TRAC may be non-op. |
Both A-TRAC and the rear locker work just in L4. However, as Tom said, there is a Locker Anytime Mod possible on the Tacoma 4X4. The discovery I made
is that A-TRAC (which is on all 4 tires) is superior to the rear locker for traction.
The traction control can be fooled to work in L4 for the non-Off Road Tacomas who don't have anything in L4, that was the mod I was mentioning
earlier. Only the 4X4 Off Road TRD Tacoma has A-TRAC and a locker.
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Udo
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Do you know if the modification will work on my FJ Cruiser, David?
Udo
Youth is wasted on the young!
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David K
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I believe they are identical. I read Tacoma World forums for all this information besides what I have personally experienced. I am sure there are some
good FJ Cruiser forums. Several Nomad are also on Tacoma World TMW and I both have the same handles over there.
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sandpoint
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| Quote: Originally posted by David K |
I believe they are identical. I read Tacoma World forums for all this information besides what I have personally experienced. I am sure there are some
good FJ Cruiser forums. Several Nomad are also on Tacoma World TMW and I both have the same handles over there. |
I know it works on 1st Gen Tacomas. Here's a Tacomaworld thread:
https://www.tacomaworld.com/threads/grey-wire-mod.4405/
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David K
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First Gen Tacomas are those made before the 2005 model year (when they all got bigger).
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