best time to put in 4x4
#21
11-28-2007, 01:28 PM
RE: best time to put in 4x4
2WD Mode: Only front wheels with ATC
4WD Auto: Only front wheels with ATC, when ATC kicks up to 50% will be sent to rear wheels
4WD Lock: 50-50 to front and rear wheels with ATC
07-08 models do not have a locking differential, and is an Electronically controlled 4WD. So you CAN put into 4WD Lock on ANY surface, because the differential isnt locked. ALL wheels spin at different speeds. Which is what you want when you have slick surfaces to stop wheel spin. If you want wheel spin, like messing around in snow, turn off the ATC.
As far as what speedyou can change modes.... 4WD Auto - any speed. 4WD Lock - I think the manual says, but probably no higher than 55-60. I will look to see.
4WD Auto: Only front wheels with ATC, when ATC kicks up to 50% will be sent to rear wheels
4WD Lock: 50-50 to front and rear wheels with ATC
07-08 models do not have a locking differential, and is an Electronically controlled 4WD. So you CAN put into 4WD Lock on ANY surface, because the differential isnt locked. ALL wheels spin at different speeds. Which is what you want when you have slick surfaces to stop wheel spin. If you want wheel spin, like messing around in snow, turn off the ATC.
As far as what speedyou can change modes.... 4WD Auto - any speed. 4WD Lock - I think the manual says, but probably no higher than 55-60. I will look to see.
#24
11-29-2007, 01:28 PM
RE: best time to put in 4x4
i wouldnt think there would be any problems with running it in 4x4 all the time....
#26
11-29-2007, 07:06 PM
RE: best time to put in 4x4
Been using it in 4WD Auto for the past week or so since it snowed. It's been amazing. You get a smooth straight start even on extremely slippery surfaces. Dealer here in Canada also noted that you can change the modes at any speed and leave it in 4WD Auto. Only advantage to keeping it in 2WD is fuel consumption; which I did during the summer. I've notices an ever so slight increase in fuel usage...though some of it would be due to the colder weather too.
#27
11-30-2007, 07:37 AM
RE: best time to put in 4x4
ORIGINAL: chenarm
I would never use 4WD Lock on dry pavement, in this mode the front and rear wheels, are assumed to turn at the same speed, if the tire diameter is not identical front to rear you can cause overheating of the transfer case and tire ware. Even if the tire are identical, in a sharp turn, the rear tire follow a tighter radius than the front one, this means that during the turn the rear wheels are turning slower than the front.
Personally I always prefer 4WD Auto, even in perfect condition, since it removes a lot of the torque steer that you get when accelerating in 2WD.
I would never use 4WD Lock on dry pavement, in this mode the front and rear wheels, are assumed to turn at the same speed, if the tire diameter is not identical front to rear you can cause overheating of the transfer case and tire ware. Even if the tire are identical, in a sharp turn, the rear tire follow a tighter radius than the front one, this means that during the turn the rear wheels are turning slower than the front.
Personally I always prefer 4WD Auto, even in perfect condition, since it removes a lot of the torque steer that you get when accelerating in 2WD.
Some of the comments (from techs no less!) on this discussion are insane.You are not going to damage your vehicle under normal road circumstances by leaving it in 4x4 (either mode) - the only thing you can hurt is your fuel economy.
As regards speed, tdford has it right, but bascically its common sense - don't change it when you have your tires screeching round a bend for example where a change might upskittle the vehicle. I've changed it between all three travelling at 75mph on a straight freeway, you can't tell its changing. If it was easily damaged, there would be big warning stickers everywhere (as Euclid says) -just like you get in a full on 4x4 where you can engage low/hi box and or diff lock.
#28
12-01-2007, 10:18 PM
RE: best time to put in 4x4
This is from the shop manual
*Tight corner braking phenomenon: When a 4WD vehicle makes sharp cornering in a paved road at low speed (ex. parallel parking), there is a difference in turning radius between front and rear wheels. If such a difference can no longer be compensated by tyre slippage, the vehicle behaves as if it is under braking.
The vehicle is tuned so that the tight corner braking phenomenon appears at a certain level with the drive mode selector in the LOCK position."
I know that the "lock" is not a Mechanical lock, like the 4WD from few years ago, and you are probably partially correct in that you will not damage the vehicle's drive system. However you will increase the wear on the tires by using the lock on high friction surfaces, and I would concider that damaging.
*Tight corner braking phenomenon: When a 4WD vehicle makes sharp cornering in a paved road at low speed (ex. parallel parking), there is a difference in turning radius between front and rear wheels. If such a difference can no longer be compensated by tyre slippage, the vehicle behaves as if it is under braking.
The vehicle is tuned so that the tight corner braking phenomenon appears at a certain level with the drive mode selector in the LOCK position."
I know that the "lock" is not a Mechanical lock, like the 4WD from few years ago, and you are probably partially correct in that you will not damage the vehicle's drive system. However you will increase the wear on the tires by using the lock on high friction surfaces, and I would concider that damaging.
#29
12-01-2007, 10:48 PM
RE: best time to put in 4x4
Yes Mitsu did a bad job for describing the settings. 4WD Auto might be better called AWD, and 4WD Lock just called 4WD.
As far as increased tire wear, yes thats true but thats what you get when using all 4 wheels. Yes, old school 4WD systems your not suppose to really use on dry surfaces or in tight turning manuvers. Ours is not like those, so you can pretty much use it on any surface at anyspeed within reason. Like I wouldnt recomend switching to 4WD Lockat 100mph.
Just think about vehicles like EVO's and WRX's. They have ALL 4 wheels spinning ALL the time. And thats for better traction, and without damage.
As far as increased tire wear, yes thats true but thats what you get when using all 4 wheels. Yes, old school 4WD systems your not suppose to really use on dry surfaces or in tight turning manuvers. Ours is not like those, so you can pretty much use it on any surface at anyspeed within reason. Like I wouldnt recomend switching to 4WD Lockat 100mph.
Just think about vehicles like EVO's and WRX's. They have ALL 4 wheels spinning ALL the time. And thats for better traction, and without damage.
#30
12-01-2007, 11:34 PM
RE: best time to put in 4x4
I think that you would probably be causing more tire ware on “4WD Lock”, than on “4WD auto”, it’s not an old school 4WD but in the ”Lock” mode it is tuned to behave a bit like an old school system, with some of the same dry surface characteristic, although to a much lesser degree. 4WD lock is sensitive to a speed differential between front and rear; it’s all over the 4WD section of the shop manual. In fact if you run the car with the spare (smaller tire) in 4WD lock, it will automatically switch to 4 WD auto, in order to protect the coupling. And if the difference is large it will switch to 2WD.
I haven’t read anything that suggests that you can not change the mode to “lock” at any speed. The only thing that is not recommended is going from 2WD to 4 WD when the front wheels are spinning while the rear wheels are static, i.e. if you are stuck in snow or mud, in 2WD and you switch to 4 WD while you have your foot on the gas.
I haven’t read anything that suggests that you can not change the mode to “lock” at any speed. The only thing that is not recommended is going from 2WD to 4 WD when the front wheels are spinning while the rear wheels are static, i.e. if you are stuck in snow or mud, in 2WD and you switch to 4 WD while you have your foot on the gas.