Full time 4wd

[LXPearl]

The 100 splits 50:50 F/R via open center diff. The 00 & up have TRAC/VSC that use the ABS to limit any excess wheel spin -wheel by wheel, and it may throttle back the engine in extreme wheel slippage conditions. I am not aware of the limits of the F/R split in a 100, but the Torsen in the 4Runner will shift up to 70% of the power to the rear. The 100 has ECU programming for TRAC at lower speeds that adjusts for "off road" type conditions, so it does not "beep" as much as the AWD systems in a Highlander, or even the 4R.

I had an AWD Sienna that was very noisy/intrusive with its TRAC system, the 4R was much less so, and my LC/LX has been quiet in comparison - doing its TRAC with minimal fuss.

 

[ShottsUZJ100]

The 100 splits 50:50 F/R via open center diff. The 00 & up have TRAC/VSC that use the ABS to limit any excess wheel spin -wheel by wheel, and it may throttle back the engine in extreme wheel slippage conditions. I am not aware of the limits of the F/R split in a 100, but the Torsen in the 4Runner will shift up to 70% of the power to the rear. The 100 has ECU programming for TRAC at lower speeds that adjusts for "off road" type conditions, so it does not "beep" as much as the AWD systems in a Highlander, or even the 4R.

I had an AWD Sienna that was very noisy/intrusive with its TRAC system, the 4R was much less so, and my LC/LX has been quiet in comparison - doing its TRAC with minimal fuss.

*50/50 split...yes
*2000+ TRAC does NOT have throttle intervention
*50/50 is the power limit...the Torsen is what can modify the F to R bias and the 100 does not have it...so 50/50 is it.
*TRAC does not BEEP whatsoever...VSC does. ALL TRAC ECU's have "programming" for slip control at lower speeds. The "programming" differs from one vehicle to another depending on inteded use/safety.
*The Sienna and Sequoia have very intrusive programming do to their design.

 

[LXPearl]

John, thanks for clarifying. I thought about what I had written on TRAC and VSC and realized I got them confused. However, the one time I have had the 100 beep at me was in deep wet snow and I was both skidding and struggling with traction on a winding road with a high crown. The 4R was pretty good, but the 04 Sienna would beep at small slippages which I could have corrected without intervention. At low speeds the Sienna's VSC and ABS (I got so frustrated with the VSC that I would use the brakes) were so intrusive that they would hinder my ability to turn in snow and ice (doing a 180 in a parking lot).

 

[2000UZJ]

LX- I found pulling the E-brake causes unwanted 180* slides. of course it was wet and leaves everywhere. but I was wanting to "slide" into a parking spot and look nifty for nobody. instead the back end went whipping around and I ended up facing backwards. Woops

 

[LXPearl]

I should clarify, the 180 in the Sienna was an attempt to turn around slowly without sliding. When I used the brake it slipped and the ABS activated, but prevented me from turning the around on the line I was using. I suspect the VSC was interfering with the ABS function. Whatever the computer was doing, it was not pleasant.

Interesting about the e-brake. I rarely use it ever; but Loud might like to explore it for his 180 slides.

 

[2000UZJ]

I should clarify, the 180 in the Sienna was an attempt to turn around slowly without sliding. When I used the brake it slipped and the ABS activated, but prevented me from turning the around on the line I was using. I suspect the VSC was interfering with the ABS function. Whatever the computer was doing, it was not pleasant.

Interesting about the e-brake. I rarely use it ever; but Loud might like to explore it for his 180 slides.

hah yea, make sure its wet out. otherwise you might have a long story on your hands to your insurance company. As i recall when I did my little 180* stunt, no VSC or any lights went on. maybe it was to quick of a action. It probably took about 1 sec. from start to finish. it threw me aroudn quite a bit. I hit some slick mud last night after a 3 day rain (5" where I am) and tested more of the CDL and VSC and Trac off, I had it sideways a few times and boy, it handles wonderfully when slick and wet. I learned a wee bit more about the locking and e-lockers and how they manipulate the engine and brakes. I think its a wonderful system. Kept me from completly spinning out and just on the edge of my skill level, and also the truck from rolling/getting stuck

And the 4wd is awesome in the rain, full time and tons of grip

 

[pman]

On the t-case discussion, if the center diff is a regular open diff, then the power split fr/rr could technically vary any where from 0% to 100% unless TRAC intervenes ( i doubt it would actually vary so greatly, it probably stays in the neighborhood of 50/50).

Since there is this power variation, that allows you to turn on pavement it is technically AWD, not 4WD. True 4WD by definition is an even 50/50 power split front and rear.

Just because it is not a torsen or viscous coupling (like Porsche, BMW, Subaru, Etc.) does not mean it is not AWD. I am not saying the 100 is an AWD vehicle, it IS a true 4WD, however if the CDL is not locked it functions like an AWD vehicle.

 

[1loudLX]

Interesting about the e-brake. I rarely use it ever; but Loud might like to explore it for his 180 slides.

I use it all the time when its snowing, not on dry pavement though. I like going slideways. I should make sure my ebrakes in tip-top for this season coming up.

 

[LandCruisers4Life]

In the Rover world, the Viscous Coupled Borg Warner cases are looked down upon as inferior to the LT230 case, which has the CDL. In other words, Viscous VS. Open case. Viscous Coupled cases use fluid which vasilates between liquid and solid depending on temperature, and when solid, it 'locks' the case. With a regular Open case, when you engage that lever or button, it's locked then and there, delivering 50/50 power to both DRIVE SHAFTS.

 

[LXPearl]

pman - interesting take. The 100 is both AWD and 4WD. Also, on the 2000 and up, it is able to function in AWD in 4Lo and 4Hi. However, considering the way the 100 works, I am not sure that the classical definitions of 4WD and AWD fit the 100. It is both in a sophisticated way.

 

[ShottsUZJ100]

On the t-case discussion, if the center diff is a regular open diff, then the power split fr/rr could technically vary any where from 0% to 100% unless TRAC intervenes ( i doubt it would actually vary so greatly, it probably stays in the neighborhood of 50/50).

Since there is this power variation, that allows you to turn on pavement it is technically AWD, not 4WD. True 4WD by definition is an even 50/50 power split front and rear.

Just because it is not a torsen or viscous coupling (like Porsche, BMW, Subaru, Etc.) does not mean it is not AWD. I am not saying the 100 is an AWD vehicle, it IS a true 4WD, however if the CDL is not locked it functions like an AWD vehicle.

Not so. The power does not vary as the center diff is OPEN (not a Torsen or LSD). There's either power or no power depending on turning, etc. None in between.

pman - interesting take. The 100 is both AWD and 4WD. Also, on the 2000 and up, it is able to function in AWD in 4Lo and 4Hi. However, considering the way the 100 works, I am not sure that the classical definitions of 4WD and AWD fit the 100. It is both in a sophisticated way.

The 100-series is:

"Permanent 4-Wheel Drive"

It's not "Selectable" as there is no 2WD mode (example..Tahoe).

It's not "AWD" as there is no 2WD mode with auto lockup and it has a 2=speed T-Case (example...CRV).

 

[pman]

Not so. The power does not vary as the center diff is OPEN (not a Torsen or LSD). There's either power or no power depending on turning, etc. None in between.


It's not "AWD" as there is no 2WD mode with auto lockup and it has a 2=speed T-Case (example...CRV).

The power has to vary when the center diff is open, otherwise you would chew up your tires and the car would jerk alot when making sharp turns on the streets. Also a Torsen and LSD allow power to vary, the difference is they resist unloading (sending all the power to one end). Power still goes to both ends when turning and it does not stay the same.

What I am trying to get at is that, yes the LC is "Full Time" four, however "Full Time" four is a synomym for AWD. I know that the LC is NOT AWD, my point is that when it is on the road (CDL unlocked) it operates similarly to a AWD vehicle. Power goes to all four wheels in varying degrees when you turn, the same way AWD vehicles do. But since LC has a CDL that can lock and it has a 2 speed t-case it is a 4WD vehicle.

Shotts I'm pretty sure I understand your angle on this. I am in way trying to be rude, I just think that when the LC is on the street it is AWD and when i press the CDL it is 4WD.

 

[ShottsUZJ100]

The power has to vary when the center diff is open, otherwise you would chew up your tires and the car would jerk alot when making sharp turns on the streets. Also a Torsen and LSD allow power to vary, the difference is they resist unloading (sending all the power to one end). Power still goes to both ends when turning and it does not stay the same.

What I am trying to get at is that, yes the LC is "Full Time" four, however "Full Time" four is a synomym for AWD. I know that the LC is NOT AWD, my point is that when it is on the road (CDL unlocked) it operates similarly to a AWD vehicle. Power goes to all four wheels in varying degrees when you turn, the same way AWD vehicles do. But since LC has a CDL that can lock and it has a 2 speed t-case it is a 4WD vehicle.

Shotts I'm pretty sure I understand your angle on this. I am in way trying to be rude, I just think that when the LC is on the street it is AWD and when i press the CDL it is 4WD.

Wrong information. That's OK.

 

[1loudLX]

the nomenclature of drivetrain systems doesnt really bother me when I get in and turn the key. Who cares what its called....just wheel the damn thing.

 

[pman]

Shotts now you've really got me thinking, could you please explain how the LC works on the street, cause I thought I knew. Hope I'm not pissing you off.

 

[2000UZJ]

the nomenclature of drivetrain systems doesnt really bother me when I get in and turn the key. Who cares what its called....just wheel the damn thing.

Must agree. I could careless if its 4wd or AWD.