Decoupler question

1
Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone
2
Paul
Yes - the drive train is from the front wheels through the front diff and through the prop shaft.
With the decoupler disconnected the above all rotates as you drive down the road.

Peter

On 16 April 2018 at 09:16, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone




--
Peter Bellamy

Mobile 0498 382 602


3
Are you sure that the decoupler is disengaging properly, i have a problem with mine it sticks on.
Bob
 
Sent: Monday, April 16, 2018 9:16 AM
Subject: [Syncro_T3_Australia] Decoupler question
 
 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

4
Yes it will the central drive-shaft will turn as you drive as the front diff and VC will provide sufficient drive to it to move it.

Shouldnt have much load through it though.

Cheers,

Skot

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone


--
Best regards, Scott Pitcher SPB Consulting
5
Check your brakes maybe causing your fuel consumption.


Sent from Yahoo Mail for iPhone

On Monday, April 16, 2018, 8:46 am, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

6
I had a thermostat stuck open once on a cold morning out of Coober Pedy that caused high fuel consumption and felt sluggish . Had to cover up the front 


Sent from Yahoo Mail for iPhone

On Monday, April 16, 2018, 8:46 am, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

7

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
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8

Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post •Reply to sender •Reply to group •Start a New Topic • Messages in this topic (4)
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.

9

Hi Beau,

Maybe I wasn't clear enough ... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., ....

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@yahoogroups.com <Syncro_T3_Australia@yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
Have you tried the highest rated email app?
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.

10
Hey Ken.

Sorry if my answer sounded rude - it wasn't meant to be (English is not my native language, so I may sound a bit weird sometimes, forming sentences :)
To the topic: I just don't think, VC (in any state) would have any influence in resistance while in 2WD.
The only thing I can imagine would be, that there is something wrong with decoupler, so when it disengages (does it?), it somehow creates resistance? Bearings in there? I would be looking there in this sort of situation...

Best regards
Beau

On Tuesday, April 17, 2018, 1:59:09 AM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

Hi Beau,

Maybe I wasn't clear enough ... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., ....

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@yahoogroups.com <Syncro_T3_Australia@yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.

.

11
I would think its not decoupling if showing resistance in decouple mode

On Tue, Apr 17, 2018 at 6:17 AM, Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:

Hey Ken.

Sorry if my answer sounded rude - it wasn't meant to be (English is not my native language, so I may sound a bit weird sometimes, forming sentences :)
To the topic: I just don't think, VC (in any state) would have any influence in resistance while in 2WD.
The only thing I can imagine would be, that there is something wrong with decoupler, so when it disengages (does it?), it somehow creates resistance? Bearings in there? I would be looking there in this sort of situation...

Best regards
Beau

On Tuesday, April 17, 2018, 1:59:09 AM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


Hi Beau,

Maybe I wasn't clear enough ... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., ....

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@ yahoogroups.com <Syncro_T3_Australia@ yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken



To: Syncro_T3_Australia@ yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.

.


12
An aggressive decoupler approaches the function of a solid shaft and would have no effect on resistance if decoupled unless it was binding in the case somehow.
An auto locking front diff could cause binding when steering even if decoupled.
Need to physically confirm that it is in fact decoupled.
Neil.

On ‎Tuesday‎, ‎17‎ ‎April‎ ‎2018‎ ‎10‎:‎59‎:‎59‎ ‎AM‎ ‎AEST, Peter Wilson peterw1000@gmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

I would think its not decoupling if showing resistance in decouple mode

On Tue, Apr 17, 2018 at 6:17 AM, Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:
 

Hey Ken.

Sorry if my answer sounded rude - it wasn't meant to be (English is not my native language, so I may sound a bit weird sometimes, forming sentences :)
To the topic: I just don't think, VC (in any state) would have any influence in resistance while in 2WD.
The only thing I can imagine would be, that there is something wrong with decoupler, so when it disengages (does it?), it somehow creates resistance? Bearings in there? I would be looking there in this sort of situation...

Best regards
Beau

On Tuesday, April 17, 2018, 1:59:09 AM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Beau,

Maybe I wasn't clear enough .... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., .....

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@ yahoogroups.com <Syncro_T3_Australia@ yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@ yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
Have you tried the highest rated email app?
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.

.


13
Good point on this, Neil (auto locking diff, positronic diff etc.) could all cause this.
It is pretty easy to check if the decoupler is actually disengaging. Just jack up one of the front wheels and spin it, while in gear (ad if diff lock installed at the front it needs to be disengaged). If not decoupler still engaged, you won't be able to spin it. You will also be able to feel the force, required to spin it (it should be very easy to spin) and came up to the conclusion, where is the drag. If hard to spin, you could try the same but with prop shaft removed (can be only at the front). If still hard to spin, it's the diff. If easy, it's probably at the decoupler side.
Cheers, Beau
On Tuesday, April 17, 2018, 11:27:57 AM GMT+10, neil smith jackthebearau@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

An aggressive decoupler approaches the function of a solid shaft and would have no effect on resistance if decoupled unless it was binding in the case somehow.
An auto locking front diff could cause binding when steering even if decoupled.
Need to physically confirm that it is in fact decoupled.
Neil.

On ‎Tuesday‎, ‎17‎ ‎April‎ ‎2018‎ ‎10‎:‎59‎:‎59‎ ‎AM‎ ‎AEST, Peter Wilson peterw1000@gmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

I would think its not decoupling if showing resistance in decouple mode

On Tue, Apr 17, 2018 at 6:17 AM, Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:
 

Hey Ken.

Sorry if my answer sounded rude - it wasn't meant to be (English is not my native language, so I may sound a bit weird sometimes, forming sentences :)
To the topic: I just don't think, VC (in any state) would have any influence in resistance while in 2WD.
The only thing I can imagine would be, that there is something wrong with decoupler, so when it disengages (does it?), it somehow creates resistance? Bearings in there? I would be looking there in this sort of situation...

Best regards
Beau

On Tuesday, April 17, 2018, 1:59:09 AM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Beau,

Maybe I wasn't clear enough .... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., ......

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@ yahoogroups.com <Syncro_T3_Australia@ yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@ yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

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14

re: "An aggressive decoupler"


Mmmmm .... I see. 

Maybe that's the answer Paul is seeking and needs fitting.

Cheers.

Ken



From: Syncro_T3_Australia@yahoogroups.com <Syncro_T3_Australia@yahoogroups.com> on behalf of neil smith jackthebearau@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com>
Sent: Tuesday, 17 April 2018 11:27 AM
To: Peter Wilson peterw1000@gmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

An aggressive decoupler approaches the function of a solid shaft and would have no effect on resistance if decoupled unless it was binding in the case somehow.
An auto locking front diff could cause binding when steering even if decoupled.
Need to physically confirm that it is in fact decoupled.
Neil.

On ‎Tuesday‎, ‎17‎ ‎April‎ ‎2018‎ ‎10‎:‎59‎:‎59‎ ‎AM‎ ‎AEST, Peter Wilson peterw1000@gmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:


 

I would think its not decoupling if showing resistance in decouple mode

On Tue, Apr 17, 2018 at 6:17 AM, Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@yahoogroups.com> wrote:
 

Hey Ken.

Sorry if my answer sounded rude - it wasn't meant to be (English is not my native language, so I may sound a bit weird sometimes, forming sentences :)
To the topic: I just don't think, VC (in any state) would have any influence in resistance while in 2WD.
The only thing I can imagine would be, that there is something wrong with decoupler, so when it disengages (does it?), it somehow creates resistance? Bearings in there? I would be looking there in this sort of situation...

Best regards
Beau

On Tuesday, April 17, 2018, 1:59:09 AM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Beau,

Maybe I wasn't clear enough .... my post only concerned the following part of Pauls enquiry:


re: "in 2WD it feels like there's resistance when driving."


So .... in your minds eye, home in on that portion of the drive-train that's relevant, i.e., ......

the viscous coupling at one end through to the front wheels at the other. All else is irrelevant.


I've offered my consideration to it, now if you could offer Paul your own consideration on it, we all may benefit.


Cheers.

Ken



From: Syncro_T3_Australia@ yahoogroups.com <Syncro_T3_Australia@ yahoogroups.com> on behalf of Beau Sagadin beau.sagadin@yahoo.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com>
Sent: Monday, 16 April 2018 1:28 PM
To: Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia]
Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 


Hmmm...wouldn't agree with that. When decoupler disengages (2wd mode) it is no difference, whether you have an aggressive VC or solid shat...and possibly even the new VC. It only transfers motion via diff to the prop shaft, which is spinning blankly, as it is decoupled from the gearbox.
The only thing that would actually make a difference (As you try to explain) is, that someone would design and make manual hub lockers...

Cheers
Beau
On Monday, April 16, 2018, 12:03:14 PM GMT+10, Ken Garratt unclekenz@hotmail.com [Syncro_T3_Australia] <Syncro_T3_Australia@ yahoogroups.com> wrote:


 

Hi Paul,


One other important thing to consider is that your VC is no longer in factory spec working condition.


So in your case when engaged in 2WD, then if a VC is out of factory spec ie., degraded to some level of aggressiveness, causes an indeterminate degree of constant engagement hence resistance (yet no driving effort), at the front wheels. This is one of the circumstances where a decoupler is fitted to avoid having the COMPLETE drivetrain unduly/constantly and so permanently engaged/stressed when otherwise coupled. Especially of concern when steering/turning/driving on unforgiving hard surfaces.


Options:

01. Leave present VC in situ and live with undue constant resistance at front wheels in 2WD, couple decoupler only when driving on loose surfaces or else only steering straight ahead on hard surfaces.


02. Replace aggressive VC with a new factory spec VC or else replace VC with a solid shaft, either eliminates UNDUE constant resistance effect you say you are feeling at front wheels in 2WD.


Cheers.

Ken 



To: Syncro_T3_Australia@ yahoogroups.com

Subject: Re: [Syncro_T3_Australia] Decoupler question
 
 

On 16/04/2018 9:16 AM, Paul Colcheedas paulcolcheedas@me.com [Syncro_T3_Australia] wrote:

 

Should the drive shaft going to the front of the van be turning when in 2wd? It feels like there’s resistance when driving and fuel consumption is around 6.5 km per litre.

Upper Yarra Print & Design
03 5966 2296
0402 478 077

sent from my iPhone

_,_.__
Reply via web post • Reply to sender • Reply to group • Start a New Topic • Messages in this topic (4)
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With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage.

.


15
Thanks everyone for all your input. I’ll jack it up and see if the front wheel spins and take it from there. Cheers Paul

sent from my iPhone
16

A few things to keep in mind, even when decoupled there is still resistance, the front diff heats up on a long drive even though it is not transmitting any torque! I also notice there is more scrubbing of the tires (low speed tight turns) in the Syncro (decoupled) than a 2WD T3


That said, even when coupled and some (light) lead from the VC does not have a dramatic effect on fuel economy, so you might have some running issues.

On checking the decoupler, the checks are simple, and worth doing to confirm, but the indicator light acts directly on the coupling gear, so if the light switches correctly your decoupler is working.

Richard