T4R TE vs. FJC TTSE

homeyclaus said:
Imperial gallons vs. US Gallons.

Units, how do they work?



There is no diff in the standard transfer case, or you'd be able to leave it in 4WD all the time, by definition. All that happens is the lever engages a clutch to spin the forward drive shaft, locking them at 1:1 or some other ratio.
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Good catch. Imperial gallons are 20% more than US. So US mpg for the manual FJ is 17.5/23.

Edit: This is interesting. Converting the numbers gives you the numbers I just posted. Toyota US shows the number you posted earlier.
 
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03_4x4Runner said:
After having the full time 4x4 on my V8 I could never go back to part time. Even when just trying to take off quickly pulling onto a road from a driveway or anything with loose gravel or wet roads the full time takes off just like it is on dry pavement. I have to be carefull doinf this in my Avalon because the tire spins. My Jeep Wrangler has part time 4x4 and I get tired of putting it in and out of 4x4 all day when off road every time a steep hill comes up. But this is 2012 and I do not like going backwards. Toyota has all parts already made it is a shame they do not use full time 4x4 on more 4runners. On my 03 full time 4x4 I love it off road. It does not bind up on turns, you seldom need to lock the center diff. All I have to do is shift to low range when needed. I also like the full time 4x4 pulling a heavy boat up a steep ramp. Put it in low with the center diff unlocked and it goes right up and you can turn corners without the axles binding up. When I do this with my freinds new F150 4x4 it binds up turning in 4x4 and feels like something is going to break.
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This is exactly my reasoning.

Not sure if you know this but if you like the look of the 4G T4R, look at the 2009 TE. They're hard to find but it's a part time 4WD system that has a locking center and rear diffs. The absolute best set up, IMO, if you like AT.
 
Bicepus Maximus said:
This is exactly my reasoning.

Not sure if you know this but if you like the look of the 4G T4R, look at the 2009 TE. They're hard to find but it's a part time 4WD system that has a locking center and rear diffs. The absolute best set up, IMO, if you like AT.
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It would seem that a AWD (full-time 4WD?) is 'converted' into a 4WD via locking center diff. Similarly, a 'part-time' system seems to have no need for center diff, since it's either 2WD or 4WD. Might be why it's hard to find!
 
Part time 4WD is even better if it has a locking centre differential. It gives it numerous useful configurations:
- RWD - gas saver
- AWD (center diff in the open position) - better traction than RWD and can be used on dry surfaces
- 4X4 (center diff locked) - better traction than AWD but shouldn't be used on dry surfaces

The additional locking rear diff, when used simultaneously with a locked center diff (or without a center diff at all) gives the vehicle at least 3 moving wheels at all times.
 
Bicepus Maximus said:
Part time 4WD is even better if it has a locking centre differential. It gives it numerous useful configurations:
- RWD - gas saver
- AWD (center diff in the open position) - better traction than RWD and can be used on dry surfaces
- 4X4 (center diff locked) - better traction than AWD but shouldn't be used on dry surfaces

The additional locking rear diff, when used simultaneously with a locked center diff (or without a center diff at all) gives the vehicle at least 3 moving wheels at all times.
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so it better to be part-time and full-time, sounds like my job!
 
Traditionally, the term "part-time 4WD" means no center differential.

The term also gets used to describe the multi-mode 4th gen V6 which has a 2WD option and, of course, a locking center diff.

The two different uses of the term sometimes cause confusion.
 
JB. said:
Traditionally, the term "part-time 4WD" means no center differential.

The term also gets used to describe the multi-mode 4th gen V6 which has a 2WD option and, of course, a locking center diff.

The two different uses of the term sometimes cause confusion.
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Now even I am confused.

Let's cover reality for a moment:

1. Part-time 4 wheel drive = no center diff. Front and rear, but NO center.

2. Full-time 4 wheel drive = center diff. Why, because front and rear axles, just like left and right tires per axle, will turn at different rates depending on what you're doing, and on high traction surfaces that will cause issues if it's not compensated for.

3. All-wheel drive = center diff, no low gear, and generally, no way to lock the center diff.

Make sense, everyone?

This being said, full-time 4wd is the most flexible, because it can do both. It's more expensive, there are wear issues possible, and some other things to worry about.

If drive trains were all equally efficient, part-time 4wd would get the best fuel consumption. This is why it was invented in the first place.
 
homeyclaus said:
Now even I am confused.

Let's cover reality for a moment:

1. Part-time 4 wheel drive = no center diff........
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I'm confused by your confusion.

Furthermore, I agree with what you wrote which only confuses me further about who is confused about whose confusion.

Hopefully, my confusion will switch from full-time to part-time. Unfortunately, as we've established, if that happens I won't notice any diff. :bigok:
 
I was never really confused, I just like asking confusing questions.

most AWD and full time 4WD both have center dif and are really one rear wheel drive, until that one losses traction, then they are (maybe) 2wd 1 front, 1 back for a little bit, then back to one wheel drive. This works better in all road conditions (rain, snow, loose stuff)

key difference in AWD and 4WD is locking center dif (a torsen center and a lsd rear is like an auto AWD=>4WD with good traction in rear = Limited) (I was a little vague on this)

most 4wd (in 4H/4L) are really 2wd 1 front/1 back (turning geometry leads to binding which is bad in high traction situations) a lsd or locker in rear gives up to 3WD. lockers front and back gives 4WD and a truck that really likes going straight - thus my prior statement regarding front locker

these statements are made not withstanding vehicles havings auburn, detroit and other auto locking diffs and solid axles.
 
This must be what it will feel like to be an alpha tester for a prototype of the first universal language translator.
 
I went harping on what Harper7 said:

harper7 said:
All 4x4 4Runners have a transfer case just some have a center diff and some have a open diff.The TE/SR5 have part time transfer case with an open center differential that can be locked providing equal power to front and rear. The Limiteds and pre 2010 4x4 4Runners have a Full time transfer case with a T3 Torsen limited slip differential that is also lockable.
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The stuff in bold = misleading
The stuff underlined = wrong

The point is that there is either a differential in the transfer case or there is not. If one is present, the vehicle is mechanically capable of being in four wheel drive on a full-time basis. There is no differential in the transfer case of the 5th gen SR5 and Trail models.
 
I am glad that we have finally gotten these issues resolved!

Maybe now we can clean up these threads!
 
homeyclaus said:
The point is that there is either a differential in the transfer case or there is not. If one is present, the vehicle is mechanically capable of being in four wheel drive on a full-time basis. There is no differential in the transfer case of the 5th gen SR5 and Trail models.
Click to expand...

A good place to end it with that simple, accurate statement.
 
homeyclaus said:
I went harping on what Harper7 said:



The stuff in bold = misleading
The stuff underlined = wrong

The point is that there is either a differential in the transfer case or there is not. If one is present, the vehicle is mechanically capable of being in four wheel drive on a full-time basis. There is no differential in the transfer case of the 5th gen SR5 and Trail models.
Click to expand...
I did give a wrong explanation about the open center diffs in SR5's and TE's .

I was confused by the meaning of "Open differential" as referring to a center diff as opposed to a LSD like the Torsen from the explanation on ...... HowStuffWorks "Differentials and Traction"

I fixed my post and noted my error :bash:

On topic........I still love them new red FJC TTSE'S
 
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