What is "real time all wheel drive" ???
Is there an all wheel drive in another space time continuum?
Is it all wheel drive in the same timezone.
What is "fake time all wheel drive"?
I am so confused
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March 26, 2010 5:06 p.m. dean1484 Dork
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March 26, 2010 5:19 p.m. mad_machine SuperDork
I think if you go fast enough, you encounter time dilation, therefor your real time all wheel drive becomes meaningless
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March 26, 2010 5:21 p.m. sobe_death Reader
What brand? Subaru, Honda, etc. It's a trade name for all wheel drive.
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March 26, 2010 6:42 p.m. Sonic Dork
Honda's name for AWD on the Civic Wagons, and perhaps the first CRVs was Real Time. My mom has had 4 AWD civic wagons, 1985 - 1991 models. The current one is a 1991 that I put a D16Y8 in along with konis, coilovers, big brakes, etc.
RT4WD is really simple, just a viscous coupler in the driveshaft between the front and rear. If there is slip between the 2, the coupler grabs and sends power back. I've driven all of these cars in major snows and even light off roading, and never gotten stuck. For a simple system, it works very well and doesn't add that much weight, though isn't up to high power high RPM drag launches
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March 26, 2010 6:42 p.m. Knurled New Reader
dean1484 wrote:
What is "real time all wheel drive" ???
Is there an all wheel drive in another space time continuum?
Is it all wheel drive in the same timezone.
What is "fake time all wheel drive"?
I am so confused
Fake time all wheel drive is when you hull out a front-drive car and convert it to rear-drive. All wheels have been driven, just not concurrently.
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March 26, 2010 6:47 p.m. jpaturzo New Reader
Regarding the Honda system, I'll just leave this here: Danger! Links to a PDF
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March 26, 2010 7:29 p.m. maroon92 SuperDork
Realtime...
Realtime?
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March 26, 2010 8:15 p.m. mad_machine SuperDork
is that where they got their name?
Honestly, I imagine that before that, you had to stop your car or truck and engage the awd system manuaully.. either at the hubs or through a lever inside
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March 26, 2010 8:22 p.m. wbjones HalfDork
those systems are called 4 wheel drive as opposed to awd... sometimes referred to as truck style
not to be driven on pavement in the dry... off rd, ok, in the wet / snow then pavement is ok
awd works fine on pavement in the dry
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March 26, 2010 10:56 p.m. irish44j HalfDork
sobe_death wrote:
What brand? Subaru, Honda, etc. It's a trade name for all wheel drive.
Subaru is "Symmetrical AWD"
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March 26, 2010 11:05 p.m. irish44j HalfDork
wbjones wrote:
those systems are called 4 wheel drive as opposed to awd... sometimes referred to as truck style
not to be driven on pavement in the dry... off rd, ok, in the wet / snow then pavement is ok
I was always under the impression that the main difference between AWD and 4WD is that 4WD has a shiftable transfer case and 4LOW ability, wheras AWD is always the same gearing relative to the engine speed.
Some people say the difference is 4WD has no center diff, and AWD does. But I don't think that holds, since a vehicle like a 4Runner is most certainly a "4WD" (in fact, the V8 cannot shift to 2WD like the V6 can), but it has both a center diff AND a shiftable transfer case. 4WD-AWD hybrid?
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March 27, 2010 12:19 a.m. skruffy Dork
dean1484 wrote:
What is "fake time all wheel drive"?
Look up "haldex"
Front wheel drive until you're smoking the front tires, then after a few minutes you get about 20% power to the rears, usually right when you've finished whatever maneuver you needed AWD for in the first place.
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March 27, 2010 3:49 a.m. jrg77 New Reader
So what's the ideal set up for tarmac? I've always thought it was LSD front and rear with viscous coupling in the center until I read somewhere that this is not compatible with ABS...
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March 27, 2010 7:38 a.m. wbjones HalfDork
irish44j wrote:
from what I've been led to believe... I'm sure there are lots on here with more specific knowledge, the biggest difference is 4WD (when locked up) shouldn't be run on pavement in the dry...wbjones wrote:
those systems are called 4 wheel drive as opposed to awd... sometimes referred to as truck style
not to be driven on pavement in the dry... off rd, ok, in the wet / snow then pavement is ok
I was always under the impression that the main difference between AWD and 4WD is that 4WD has a shiftable transfer case and 4LOW ability, wheras AWD is always the same gearing relative to the engine speed.
Some people say the difference is 4WD has no center diff, and AWD does. But I don't think that holds, since a vehicle like a 4Runner is most certainly a "4WD" (in fact, the V8 cannot shift to 2WD like the V6 can), but it has both a center diff AND a shiftable transfer case. 4WD-AWD hybrid?
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March 27, 2010 9:34 a.m. irish44j HalfDork
wbjones wrote:
irish44j wrote:
from what I've been led to believe... I'm sure there are lots on here with more specific knowledge, the biggest difference is 4WD (when locked up) shouldn't be run on pavement in the dry...wbjones wrote:
those systems are called 4 wheel drive as opposed to awd... sometimes referred to as truck style
not to be driven on pavement in the dry... off rd, ok, in the wet / snow then pavement is ok
I was always under the impression that the main difference between AWD and 4WD is that 4WD has a shiftable transfer case and 4LOW ability, wheras AWD is always the same gearing relative to the engine speed.
Some people say the difference is 4WD has no center diff, and AWD does. But I don't think that holds, since a vehicle like a 4Runner is most certainly a "4WD" (in fact, the V8 cannot shift to 2WD like the V6 can), but it has both a center diff AND a shiftable transfer case. 4WD-AWD hybrid?
I think historically that might have been the case. My '90 XJ most certainly you did not want to run 4WD (hi or lo) on dry pavement, unless you liked going "bump bump bump" around turns.
Meanwhile, the 4Runner can be driven indefinitely in 4hi on dry streets with no negative effects (per Toyota) due to its center diff. But in 4lo you get the same "bump bump bump" and it is not suggested in the dry. And I don't think anyone will argue that a 4Runner isn't a "real 4x4" considering its long history of off-road accumen.
Maybe I'll swap the "4WD" and "AWD" badges off my 4Runner and Subaru, ,lol...
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March 27, 2010 9:43 a.m. ignorant SuperDork
There is full time four wheel drive, which is basically all wheel drive.
It all comes down the to a center diff. Have a center diff, you really have AWD. If the Center diff is locked or lockable you really have 4wd.
dig around here for coolio graphics that pretty much say the same thing.
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March 27, 2010 10:00 a.m. iceracer HalfDork
Jeep full time awd has a lockable center differential.
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March 27, 2010 10:57 a.m. dean1484 Dork
Jeepers!!! I go away and you all get serious on me here!!!
I was actually poking fun of the various marketing names for the various types of drive systems. I don't think there is a actual definition that the automotive industry has adopted for these. I wish they would as it it would let you know at a glance what something is.
Similar to
SOCH & DOHC
and so on.
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March 27, 2010 3:36 p.m. ignorant SuperDork
iceracer wrote:
Jeep full time awd has a lockable center differential.
Jeep dosen't call it full time awd.. They call it full time four wheel drive or some other nonesense, been doing that since that quadratrac junk on the FSJ's.
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March 27, 2010 3:44 p.m. RossD Dork
Maybe the converse would be "ImaginaryTime AWD"
