Last post on Aug 21, 2013 at 5:16 PM
You are in the Toyota Sequoia
What is this discussion about?
Toyota Sequoia, Toyota Highlander, Toyota 4Runner, Toyota Land Cruiser, Toyota RAV4, Toyota Tacoma, Truck, SUV
Oct 01, 2003 (1:33 pm)
Toyota LC (similar to 4runner's full-time V8 system) has been around since 1998/1999 with the current 4wd system. I have not seen one case of failure or problem. Remember, this LC has been around the world.
The center differential on the TLC and 4runner (also since 1999 with the full-time capability) is GEAR-based, not clutch- or viscous coupling based. Gear-based differetial is far more reliable/durable and requires little maintenance.
I don't think that it will be a problem for the Toyota 4wd systems.
Full-time is ALWAYS safer than 2wd. Just imagine running into an oil slick in the middle of the road on a sunny day. Or how about an emergency evasive maneuver.
There's plus and minus to both systems. Durability is likely NOT a minus to the full-time system.
#1221 of 2493 ALWAYS safer....NOT!
Oct 01, 2003 (3:24 pm)
Delivering engine drive or braking torque to the front wheels/tires will ALWAYS reduce the level of roadbed adhesion available strictly for directional control.
That's mostly what's wrong and basically unsafe about FWD, unless you practice and get really good at quickly popping your automatic transmission into neutral.
The very best 4WD/AWD system would be one that uncouples the engine from the front driveline the instant the yaw sensor indicates side forces there.
#1222 of 2493 wwest...you're still around??
Oct 01, 2003 (3:59 pm)
Well, the 4runner varies torque to front axle.
#1223 of 2493 Full Time 4WD - intmed99
Oct 01, 2003 (4:24 pm)
I hit said oil slick which spun me around like a top. I thank God there was no one around me because I ended up in the opposite lane. I was in 2WD at the time. I've been in 4WD ever since.
Oct 01, 2003 (8:16 pm)
I'll categorically disagree with Wwest's characterization that adding driving or braking on front tires to create an all wheel drive system is bad. Driving all four wheels all the time is a good thing under any circumstance you can possibly come up with. Clearly braking is too, but I'll assume you did not really mean that front braking is a handicap.
Granted, torque at the steering wheels DOES reduce available traction for steering. But if the vehicle is at the limit of traction on a slippery surface, then all manner of shortcomings accrue to any 2wd system vs an all wheel drive system which dimish the 2wd system in the overall performance envelope.
For instance, I'd bet I can get my underpowered AWD Subaru around a slippery (icy) road course faster than ANY 2wd vehicle. Yes, there'd be a corner or two where I understeered, but that 2WD vehicle would require very high skill levels to handle constant oversteer, plus be unable to accelerate on the straights like I can. No contest, all wheels driven is safer.
As for "drive train stress" mentioned above, consider this. In 2wd, you're subjecting the rear axle and components to 100% of the engine's stress and force. In 4wd, you've just cut that in half and nicely spread the stress between the front and rear axles.
#1225 of 2493 Full time 4wd
Oct 02, 2003 (5:24 am)
All good points for sure. Granted, none of the guys I know with 4wd problems drove Toyota's...one more reason I got the 4runner. I think the stability control now standard mitigates most of the safety concerns but certainly not the most extreme mentioned above. By the way, does anyone know whether the front halfshats are turing in 2wd mode or if they are and are simply not powered?
#1226 of 2493 No doubt....
Oct 02, 2003 (8:29 am)
Running an AWD continuously on a slippery track, fully knowledgeable of same, is not exactly the same thing as the rare occassion John Q Public encounters in an unprepared manner.
My referral to front braking was with regards to engine lagging torque, the front driven wheels driving the engine, not to ordinary braking.
#1227 of 2493 Transmition differance 4 vs. 5 speed
Oct 03, 2003 (7:01 pm)
I am looking to buying V6 Limited 4X4. I want to know about 4 Speed vs 5 Speed that how much it makes a difference mechanically and how?
I am aware the 4 speed is with V6 and 5 speed is with V8
#1228 of 2493 5-speed vs. 4-speed
Oct 03, 2003 (7:52 pm)
5-speed auto has a stronger (numerically high) 1st gear. Therefore, acceleration from stop is more lively. In addition, in off-roading, the strong 1st gear allows for more torque multiplication (better crawl ratio). If you do any towing, then 5-speed will be a good thing.
#1229 of 2493 5 speed.....
Oct 04, 2003 (8:08 am)
allows the engine to remain more tightly within it high torque "band"/range during serious acceleration. not disputing lower first gear either.