All wheel or 4 wheel

Discussion in 'General Motoring' started by Bob Miller, Jan 6, 2004.

  1. Bob Miller

    Bob Miller Guest

    I would like your opinion on all wheel drive vs 4 wheel drive. I
    would like to get a all wheel drive in the future are they as good or
    better then 4 wheel drive on the snow. Thank you for any help you can
    give me. Bob
    Bob Miller, Jan 6, 2004
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  2. Bob Miller

    Le Bernadin Guest

    (Bob Miller) wrote in
    Most AWD Scoobies these days are 90/10 meaning unless rear traction is
    needed, the vehicle is essentially a FWD. Its only re-distributed to true
    AWD under conditions that warrant it.

    I believe the WRX and naturally STI are fulltime AWD but there are
    certainly people who are more versed in this that can add their 2 cents.
    Le Bernadin, Jan 6, 2004
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  3. Bob Miller

    Marc Soloway Guest

    Close, Subaru has a couple of different AWD systems,
    Auto, Hydraulic fluid shift within the transfer case plates get pushed
    together 60/40 maximum split Electronic, disable with fuse when using small
    spare or AT temp light comes on.

    5 speed Manual Viscous differential Coupling, plates separated by silicone
    gets thick and binds plates when heated, slipping 90/10 this is also used on
    the models which have Ltd slip rear's (XS and above Foresters, All Outbacks,
    but the sport, 2.5 GT, and WRX and STi.) STi also has an electronic suretrac
    system in the front.

    VDC, Vehicle dynamics control, only on the VDC 6 Cyl OB, is an electronic
    system which will even depower 4 of the 6 cyl, can slow one wheel and speed
    up another. (only for the truly aggressive driver or for severe avoidance
    situations.) There is also a VTD, Variable Torque Distribution which routes
    55 to the rear.

    Now that should clear up the mechanics

    AWD has an open center differential which allows for varying amounts of
    power, you are less likely to Hydroplane, you will track truer in the
    corners (4WD jumps in tight turns) it is better on the roads. 4WD is better
    off the Roads. When our plow truck gets stuck we pull it out with a Subie.

    Marc Soloway
    Natick Subaru Sales
    Natick, MA
    Marc Soloway, Jan 6, 2004
  4. AWD is better for street driving in crappy weather. The main advantage you
    want over 2WD is that the torque on each drive wheel is 1/2, so you are less
    likely to lose traction, especially in corners. I have heard that in a 4WD
    you have to be careful going round tight corners in slippery conditions as
    the rear wheels are trying to go the same speed as the front (i.e. no center
    differential), so they spin out and you fish-tail. All Subaru AWD have some
    form of limited slip center differential so it helps too if you have one
    wheel or both wheels on an axel on ice.

    4WD would be better in unplowed back country roads where you are not trying
    to go fast, just trying to go.
    Dominic Richens, Jan 6, 2004
  5. Bob Miller

    J999w Guest

    4WD would be better in unplowed back country roads where you are not trying
    That would partially explain why my '87 XT 4wd crawls through deep snow better
    than my '92 Legacy AWD ! (narrower tires on the XT too).

    J999w, Jan 6, 2004
  6. Bob Miller

    Tony Hwang Guest

    If you have to ask that question, drive AWD, you may damage 4X4
    drive train.
    Tony Hwang, Jan 6, 2004
  7. Bob Miller

    David Guest

    Most "4WD" vehicles are part time, and if you're using them on snow
    on the road, it's to get unstuck, or to drive slowly. I'm sure it's fine for
    snowy conditions*, but AWD is more pleasant for on road driving.

    Full time 4WD is very similar to AWD, but often (always?) comes with features
    that make it better for off-roading:
    1. At least one locking diff
    2. Low-range off-road gearing.

    Full time 4WD tends to be only available on expensive trucks, although if
    memory serves, Kia may offer it too. OTOH, for nearly all of my driving,
    I think I'd rather be driving my Forester than a Kia Sorrento.

    * (footnote) Last time I was in a vehicle that got stuck, it was a truck with a primitive
    PT 4WD system on an unploughed road. We were spinning one front and one back
    tire, and finally backed out (actually we continued on our bikes, then backed out after
    returning to the truck), since we couldn't procede. We had been chopping away fallen
    trees & branches to get as far as we did.

    The truck may have had an advantage over my Sube as it had better clearance, but it's
    advantage sure wasn't in its drive system, as I have an LS rear diff, and should be able
    to spin 3 tires instead of 2. Also my tires are in better shape, which in this case I think
    mattered more than the drive system.
    David, Jan 7, 2004
  8. In my experience, it is about the same. An important point missed in this
    thread is that all Subies come with ABS.
    Also, this time of year in the northern hemisphere, most of the vehicles you
    see in ditches are 4WD.
    Stupid drivers do not understand that all vehicles have 4 wheel brakes and
    irregardless of drive do not stop faster ;(
    Frank Logullo, Jan 7, 2004
  9. Bob Miller

    BSackamano Guest

    I always add the 4WB option. It's worth the money...
    BSackamano, Jan 7, 2004
  10. Bob Miller

    GTT Guest

    I don't mean to pick at what may be a typo, but what is a "4WB" option?
    I'm willing to learn something new!
    GTT, Jan 8, 2004
  11. Bob Miller

    David Guest

    4 wheel brakes, referring to the part below.
    David, Jan 8, 2004
  12. And some does not understand that "all wheel" is identical to "4 wheel".
    Most vehicles have exactly four wheels.
    Åke Johansson, Jan 8, 2004
  13. Bob Miller

    David Guest

    Manufacturers mean different things by the terms though (although not that different).
    In neither case does a part-time system have a center differential. Although sometimes
    manufacturers and comsumers differ on what is and isn't a part-time system.

    It helps to define the terms before making a decision on which is better. I didn't do
    that (although I may have clarified it a little in my first post), but I didn't say which
    is better either.
    David, Jan 8, 2004
  14. Bob Miller

    GTT Guest

    Okay, sorry. It was not nearly so naked in the earlier post. I see the
    GTT, Jan 9, 2004
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