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
#2087 of 2493 Re: my 2007 tachoma sucks [busky]
Dec 23, 2007 (8:26 pm)
I thought this was the "Toyota 4WD systems" forum, but I'll address your post. First, try posting in the Tacoma forum for more responses related to your Tacoma. Second, it's wintertime, when MPG usually takes a dive due to different gasoline formulations and of course cooler weather. Third, Michelin and Dunlop tires give better MPG than Bridgestone's. Fourth, the speaker and hood adjustments can be taken care of under warranty. Fifth, the tailgate shouldn't be expected to support the weight of an 800lb or heavier Harley. Sixth, no vehicle is perfect. My 4Runner had the radio replaced at 1100 miles and the VSC warranted at 11,000 miles. I've had no problems since except for lousy dealer maintenance..
You won't have any trouble selling your vehicle should it not meet your expectations. Your post makes it appear though you needed a vehicle with a longer bed to begin with so your Harley wasn't riding on the tailgate. My neighbor has the same vehicle as yours in the DC configuration and has had -0- issues. Another neighbor got a DC 4X4 shortly thereafter, and has no complaints either. Both are 2007 models.
#2088 of 2493 Re: my 2007 tachoma sucks [busky]
Dec 23, 2007 (9:12 pm)
You'll want to ask in one of the Toyota Tacoma discussions.
SUVs and Smart Shopper
#2089 of 2493 Re: Introduction [cliffy1]
Dec 25, 2007 (12:04 pm)
Cliffy1: As someone trying to buy either a 2005 or 2006 Toyota HLander, your postings are invaluable. Far more understandable information than any dealer I have talked to. I travel a lot of semi-rural back roads in a variety of weather conditions (snow, sleet, rain) and sometimes in Northern Maine I have to drive logging roads for several miles. Am I right in assuming that I should hold out for a 4WD HLander and not touch anything else (e.g. "all wheel drive") or any system that doesn't specifically have the 4WD designation on the rear of the car body? I am completely confused by the designation 4X4 on some cars I have been shown. Any advice to this vehicularly challenged individual would be most appreciated.
#2090 of 2493 Re: Introduction [cubanpete2]
Dec 25, 2007 (2:02 pm)
The Highlander is NOT 4WD as defined by most knowing folks.
The Highlander is F/AWD, and that for marketing purposes only.
Note that there is a MYRIAD of F/AWD implementation methods out there in the marketplace, all with varying degrees of multi-wheel drive capability. The Acura/Honda SH-AWD system likely being the best of them, but in my opinion still inadequate for the conditions of travel you encounter.
The Highlander uses three, front/center/rear, fully open differentials and would therefore be a 1WD vehicle were it not for the electronic braking capability provided by the TC, Traction Control, system.
Many owners are already complaining that the TC system is totally inadequate for getting the vehicle unstuck, or even up and going on a slippery surface initially as long as TC is active.
As a result some Toyota and Lexus F/AWD vehicles now have a TC disable function so the driver can use at least some level of wheelspin to get unstuck or rock back and forth to get unstuck. But one must keep in mind that with TC disabled you are back to 1WD.
Toyota is also introducing a new form of TC called A-LSD, so far only installed on RWD or R/AWD vehicles, and apparently only activated if primary TC is disabled. A-LSD stands for Automatic Limited Slip Differential.
It has always made sense to have LSD for a rear differential but somewhat hazardous, absent some driver familiarization training, for implementing at the front differential.
IMMHO the vehicle you're really looking for is the Toyota 4runner. The 4runner has RWD mode, AWD mode, and most importantly for those logging roads, TRUE 4WD/4X4 mode, capability.
But the key question to ask those salespersons is if the front driveline can be locked, SOLIDLY LOCKED, to the rear driveline for travel on those several miles of logging roads in the wintertime, or MUDDY spring. And I would be sure, CERTAIN sure, that whatever vehicle you purchase also has some form of rear LSD.
Dec 25, 2007 (5:27 pm)
The Sequoia 2008 seems to be able to fully lock the front to the rear. I saw the button in the Platinum I was in.
As for the Highlander, I thought it had a viscous fluid unit between front and rear which automatically stiffens if there is a difference in speed. I would call this a form of limited slip and not 'open.'
#2092 of 2493 Re: d [trebor129]
Dec 25, 2007 (9:10 pm)
The early RX300 AWD model did have a VC across the center diff'l but that design was dropped with the introduction of the RX330 series in '04 in favor of only the TC system for AWD capability. I understand it is the same for the HL and Sienna, at least the last I checked with the documentation at techinfo.toyota.com.
Lexus.com still indicates the RX350 has a VC but the documentation indicates that it does not. I'm in an ongoing argument with Lexus customer service about this at this very moment.
Dec 26, 2007 (5:41 am)
It would seem like the auto-wheel-braking traction control combined with a front, rear, and center limited slip would be the single best system. That is what a 1999 and newer Hummer H1 uses. They use three Torsen diffs though I am not sure exactly which model Torsen.
#2094 of 2493 Re: Introduction [wwest]
Dec 26, 2007 (6:58 am)
I agree with wwest. The 4Runner has a far more sophisticated and capable AWD/4WD system than the Highlander and will do far better offroad and on bad logging roads than a Highlander.
#2095 of 2493 Re: d [trebor129]
Dec 26, 2007 (9:03 am)
If you have mechanical front/rear/center LSDs why would you even need auto-wheel-braking traction control..??
Dec 26, 2007 (10:50 am)
"If you have mechanical front/rear/center LSDs why would you even need auto-wheel-braking traction control..??"
Because the LSD is not as good as a locking differential when there is zero traction such as when one tire is in the air.
But if the car can detect that tire slipping and use the brake just on that wheel, it can force 100% of the torque to other wheels. This comes close to the performance of a fully locked differential.
A LSD does not redirect all the torque, just some percentage of it.
My 1997 Hummer H1 had all limited slip differentials and the instruction manual said that if one wheel was in the air, you could force it to not spin by applying the brakes. The Torsen diff would then act as a torque-multiplier and make the other tires overpower the brakes and move. In 1999 they improved this by having a computer just only apply brakes to the wheels actually slipping instead of all of them. They still kept the LSDs. As far as I can tell, it is the ultimate full time system and probably just as good as 3 locking diffs without having to turn them off on pavement.