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Old 12-06-2005, 11:42 PM   #1
jonney_boy
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Default AWD in reverse?

I was sitting at home the other day and just happened to think about my friends crv. It is a "part time" awd system where the car is running in fwd mode untill you start to slip, then the rears kick in. Works great going forward.

Then we managed to get the car stuck going forward and realized that the "awd" system does NOT work in reverse. When trying to back out, only the front tires where spinning, the back just sat there.

So my question is, do the subaru's awd system work in reverse also? I have a 03ts currently if it makes any difference.


(ps.. sorry if it's a really dumb question, I searched and didn't notice anything)
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Old 12-06-2005, 11:46 PM   #2
J-Rex2004
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yes45
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Old 12-06-2005, 11:46 PM   #3
WR^2X
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Yes, it will work.
The Honda CRV's system is totally different.

All of our tires are always powered. In the CRV, the rears are only powered when the car thinks they need to be.
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Old 12-06-2005, 11:49 PM   #4
KingOfSiam
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All Wheel Drive, All The Time.
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Old 12-06-2005, 11:54 PM   #5
shemoves
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actually, some wheels spinning and some not on a Subaru would be very bad for the car.
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Old 12-06-2005, 11:56 PM   #6
dexterous
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Well, technically the only vehicles that have all four wheels "powered" are vehicles with three LSDs (STI, etc). Even the wrx is technically three wheel drive since it has a center and rear LSD with an open front diff. I think the TS is made up of all open diffs which means that it would have significantly less traction while stuck in the snow or mud. I am not 100% sure though because the center diff may be a LSD.

Regardless, the awd system is mechanical and all parts move all the time.
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Old 12-07-2005, 01:55 AM   #7
Kawikid20o2
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I got mine stuck in about 8 inches of mud, and she just shut the rear wheels down in D and R, 1 2 3 man. not man. it was pissed let me tell you.

But the AWD systems have changed since my car was made.
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Old 12-07-2005, 06:04 AM   #8
joeyd02
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Its AWD all the time, but when one wheel is not getting traction then the power goes to the other wheels.
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Old 12-07-2005, 06:31 AM   #9
Spore
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Quote:
Originally Posted by dexterous
Well, technically the only vehicles that have all four wheels "powered" are vehicles with three LSDs (STI, etc). Even the wrx is technically three wheel drive since it has a center and rear LSD with an open front diff. I think the TS is made up of all open diffs which means that it would have significantly less traction while stuck in the snow or mud. I am not 100% sure though because the center diff may be a LSD.

Regardless, the awd system is mechanical and all parts move all the time.
AWD is a AWD. Just because it has less than 3 LSD doesnt mean its not gonna drive all four wheels at the same time. LSD just helps it distribute power. I think the TS's cent diff is an LSD...
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Old 12-07-2005, 06:49 AM   #10
LetItSnow
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A front open diff and rear LSD means three wheel drive. Believe the tech over the Flash.
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Old 12-07-2005, 08:12 AM   #11
sha_zapple
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All AWD is not created equal. If you dont have a LSD, then all the power is going to go to the wheel that is slipping, therefor 3wd. Thats why the 04 SRT4's do pegleg burnouts, cause they have an open front diff (1wd baby!).
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Old 12-07-2005, 08:36 AM   #12
Samirr76
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Its still FOUR wheel drive because there is a driveshaft to each wheel. open vs. closed diff does not change the layout, its just not as effective as LSD.
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Old 12-07-2005, 09:48 AM   #13
Beanboy
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Actually, 2004 SRT-4s came from the factory with an LSD.

Even the 2003s that didn't have the LSD would usually do a 2WD burnout in a straight line since they had equal length driveshafts.

-B
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Old 12-07-2005, 10:45 AM   #14
HighRevimpreza
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Quote:
Originally Posted by dexterous
Well, technically the only vehicles that have all four wheels "powered" are vehicles with three LSDs (STI, etc). Even the wrx is technically three wheel drive since it has a center and rear LSD with an open front diff. I think the TS is made up of all open diffs which means that it would have significantly less traction while stuck in the snow or mud. I am not 100% sure though because the center diff may be a LSD.

Regardless, the awd system is mechanical and all parts move all the time.
Im not following this
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Old 12-07-2005, 10:45 AM   #15
Howl
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The Subaru system is AWD all the time, but the ratios of where the power is directed can change. On the TS (I also have an 03) with the manual transmission it is 50/50 all the time. With the 4EAT (automatic transmission) it is 50/50 in first and reverse, and 80/20 in 2nd, 3rd and 4th, with the ability to vary to 50/50 is slippage is detected.

The TS has open diffs front and back which means it is possible that one back wheel and one front wheel can spin while the other two sit still. I encountered this situation once when I was trying to get up a very slippery hill in freezing rain. The road was half-an-inch thick glare ice, but along the shoulder some of the gravel was still poking through. If I got two wheels on the gravel I could move forward, but as soon as I gave it too much gas the wheels on the ice side spun and I started sliding back. Eventually I made it up the hill, but it wasn't easy.

Last edited by Howl; 12-07-2005 at 10:50 AM.
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Old 12-08-2005, 06:57 AM   #16
LetItSnow
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It's pretty clever, the way the SRT-4 had equal length shafts. Naturally, with the transverse engine, it's not typical, but they have an intermediate shaft going to the right tire that's held in place by a bearing, simulating the location on the driver's side. It's the best you can really do without being truly symmetrical.

The first year SRT-4 did have an open diff, and then they switched to the Quaife. I was involved in pre-production testing (the plant where I work produces the transaxles for the Neon/Stratus/European Chrysler minivans), and I remember when the engineers started implementing the Quaifes as an experiment. The road testers said there was a world of difference on the dry pavement.

OK, end of my sidebar. I'm giving Howl a +1 for his account on his open diffs.

I've got to get my rear LSD in motion... work calls!
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