4WD Yaris / Vitz questions - Page 2 - Toyota Yaris Forums

CB900F2 · 07-30-2016, 06:55 AM

DAM!. I would have loved to have had a AWD sedan!

KTS · 07-30-2016, 06:14 PM

I recently saw two automatic 4wd transmissions locally and I am sure there are more.

CoryM · 07-30-2016, 08:58 PM

Actually from the parts diagrams it looks like the clutch is in the rear diff. Look up "Transfer assembly" here:
http://www.megazip.net/zapchasti-dly...5-ahpgk-423043

T-case is just a simple ring and pinion, no center diff. All the slippage happens in the "Coupling assembly" which I assume is either a viscous clutch, or a tiny multi-disc clutch. Could be either or both if it has a lockup.

Swing · 07-31-2016, 05:56 PM

Quote:

Originally Posted by CoryM

Actually from the parts diagrams it looks like the clutch is in the rear diff. Look up "Transfer assembly" here:
http://www.megazip.net/zapchasti-dly...5-ahpgk-423043

T-case is just a simple ring and pinion, no center diff. All the slippage happens in the "Coupling assembly" which I assume is either a viscous clutch, or a tiny multi-disc clutch. Could be either or both if it has a lockup.

Where can I find this Coupling assembly in the parts system?

If you lookup "Transfer assembly" then you just get the outside of the transfer case. (which is indeed only ring and pinion, no diff)

CoryM · 07-31-2016, 06:07 PM

Look up the rear differential. It's in there.

CTScott · 07-31-2016, 06:40 PM

Quote:

Originally Posted by Swing

Where can I find this Coupling assembly in the parts system?

If you lookup "Transfer assembly" then you just get the outside of the transfer case. (which is indeed only ring and pinion, no diff)

The rear diff is: 41301-52100, which is the same rear diff as the 2008 US market RAV4. Even the entire assembly (41110-52010) is identical to the 08 Rav4.

The coupling for the RAV4 is different though. The RAV4 used an electromagnetic coupler allowing the rear drive to be disengaged. The NCP95 Vitz used a viscous coupler with no option for disengagement.

enviri · 07-31-2016, 07:09 PM

make a list :P yaris4(wd) for CTScott

Swing · 08-01-2016, 01:31 AM

Quote:

Originally Posted by CTScott

The rear diff is: 41301-52100, which is the same rear diff as the 2008 US market RAV4. Even the entire assembly (41110-52010) is identical to the 08 Rav4.

The coupling for the RAV4 is different though. The RAV4 used an electromagnetic coupler allowing the rear drive to be disengaged. The NCP95 Vitz used a viscous coupler with no option for disengagement.

Ok I see it now.

I could not find it because I was checking the rear diff of a first gen Vitz 4wd, it does not have this coupling assembly in the rear. It may have something funny around the prop shaft, but I'm not sure if that's a coupling assembly (it's not called that way)
So it is a bit unclear on the first gen Vitz.

But for the automatic gen 2 Vitz 4wd I see the coupling assembly.
ALso the gen 3.

But the gen 3 has to button to lockup the middle (see previous page youtube), so I would assume it is an electromagnetic coupler (at least in the gen 3) instead of viscous.

And to mee it still seems if it takes the power from the left front driveshaft. So (without LSD) it would mean that if the right front wheel is loosing traction and spinning, the rest of the wheel wouldn't get any power?

CTScott · 08-01-2016, 05:19 AM

Quote:

Originally Posted by Swing

Ok I see it now.

I could not find it because I was checking the rear diff of a first gen Vitz 4wd, it does not have this coupling assembly in the rear. It may have something funny around the prop shaft, but I'm not sure if that's a coupling assembly (it's not called that way)
So it is a bit unclear on the first gen Vitz.

But for the automatic gen 2 Vitz 4wd I see the coupling assembly.
ALso the gen 3.

But the gen 3 has to button to lockup the middle (see previous page youtube), so I would assume it is an electromagnetic coupler (at least in the gen 3) instead of viscous.

And to mee it still seems if it takes the power from the left front driveshaft. So (without LSD) it would mean that if the right front wheel is loosing traction and spinning, the rest of the wheel wouldn't get any power?

Not off the front left, but rather off the ring gear of the outside of the front diff. The front diff is just the normal front diff with a modified housing for that portion of the tranny.

Correct on the 3rd gen - It does look like they added the electric lockup.

Swing · 08-01-2016, 06:05 AM

Quote:

Originally Posted by CTScott

Not off the front left, but rather off the ring gear of the outside of the front diff. The front diff is just the normal front diff with a modified housing for that portion of the tranny.

Ok I can't see that from the partssystem, but that sounds more credible. Otherwise it would be a worthless system.
Maybe this part 41319-52011 (3rd gen Vitz) in fact turns around the driveshaft but is not connected to the driveshaft? (because it is connected to the front diff housing/ring)

So they can have a different speed, even though it looks like one axle.

Quote:

Originally Posted by CTScott

Correct on the 3rd gen - It does look like they added the electric lockup.

Ok, so you say that the 2nd has viscous coupling. I can believe that, but it is really hard to say from the parts catalogue (the coupling assembly really looks the same as the 3rd gen with electric coupling)

On the 1st gen there might be something funny in the propshaft, but it could just be some holder for a bearing. So I'm not sure how that one works.

To be honest I still think all generations have an electric coupling assembly with a button, but I could be very wrong about it

Any setup using viscous coupling could be nice for high power awd (like a Celica GT4).
A fixed electromagnetic coupling is nice for dirt roads, not nice for high power awd (it isn't even awd anymore, it would be parttime 4x4 then). But it would be nice to have it fixed into a rear wheel drive Yaris.

CTScott · 08-01-2016, 08:12 PM

Quote:

Originally Posted by Swing

Ok I can't see that from the partssystem, but that sounds more credible. Otherwise it would be a worthless system.
Maybe this part 41319-52011 (3rd gen Vitz) in fact turns around the driveshaft but is not connected to the driveshaft? (because it is connected to the front diff housing/ring)

So they can have a different speed, even though it looks like one axle.

Ok, so you say that the 2nd has viscous coupling. I can believe that, but it is really hard to say from the parts catalogue (the coupling assembly really looks the same as the 3rd gen with electric coupling)

On the 1st gen there might be something funny in the propshaft, but it could just be some holder for a bearing. So I'm not sure how that one works.

To be honest I still think all generations have an electric coupling assembly with a button, but I could be very wrong about it

Any setup using viscous coupling could be nice for high power awd (like a Celica GT4).
A fixed electromagnetic coupling is nice for dirt roads, not nice for high power awd (it isn't even awd anymore, it would be parttime 4x4 then). But it would be nice to have it fixed into a rear wheel drive Yaris.

The 2nd gen was definitely not switchable. I seriously looked into importing the parts from one to convert a US one back in late 2009, but abandoned the idea when I found out that the chassis was different (tunnel) and that you had to also import the entire AT, as the transfer case assembly is custom fit to it at the factory.

Dieselking · 11-29-2016, 06:36 PM

Try looking for parts for the Toyota Urban Cruiser (europeean version of the Scion XD)

they are mostly AWD, and all parts can be used on Yaris!

To answer the question about engaging rear diff, look at the front of the rear diff housing.
There is a bolted on multiplate coupling, activated electrically, and only when needed, and never over 40? km per hour.

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07-30-2016, 06:55 AM	#19
CB900F2 Drives: 08 Sedan Join Date: Oct 2008 Location: Toronto Posts: 301	DAM!. I would have loved to have had a AWD sedan!

07-30-2016, 06:14 PM	#20
KTS Drives: Vitz RS Join Date: Feb 2009 Location: Trinidad and Tobago Posts: 272	I recently saw two automatic 4wd transmissions locally and I am sure there are more.

07-30-2016, 08:58 PM	#21
CoryM Drives: 2009 5-door, 5-speed Join Date: Sep 2011 Location: White Rock BC Posts: 687	Actually from the parts diagrams it looks like the clutch is in the rear diff. Look up "Transfer assembly" here: http://www.megazip.net/zapchasti-dly...5-ahpgk-423043 T-case is just a simple ring and pinion, no center diff. All the slippage happens in the "Coupling assembly" which I assume is either a viscous clutch, or a tiny multi-disc clutch. Could be either or both if it has a lockup.

07-31-2016, 06:07 PM	#23
CoryM Drives: 2009 5-door, 5-speed Join Date: Sep 2011 Location: White Rock BC Posts: 687	Look up the rear differential. It's in there.

07-31-2016, 07:09 PM	#25
enviri View User's Garage Drives: 2010 Yaris Join Date: Oct 2008 Location: CT Posts: 1,516	make a list :P yaris4(wd) for CTScott

11-29-2016, 06:36 PM	#30
Dieselking Drives: 07 1,4d diesel Join Date: Apr 2012 Location: europe Posts: 12	Try looking for parts for the Toyota Urban Cruiser (europeean version of the Scion XD) they are mostly AWD, and all parts can be used on Yaris! To answer the question about engaging rear diff, look at the front of the rear diff housing. There is a bolted on multiplate coupling, activated electrically, and only when needed, and never over 40? km per hour.