Decoupler kits

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Re: Decoupler kits

Postby lloydy » 15 Oct 2015, 11:14

clift_d wrote:
lloydy wrote:Unfortunately there won't be any at the time my box is being done. So I'm out! :cry: :lol:


Mine sat on a shelf at Aidan's place for at least six months until my gearbox was with him to be rebuilt, so I doubt that would be a problem.
:mrgreen:

Nah, my box is there in the next week or so. So will be gone before the decouplers are in.
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Re: Decoupler kits

Postby v-lux » 15 Oct 2015, 16:42

Order one, you're bound to change your gear ratios in a few weeks time. :wink:
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Re: Decoupler kits

Postby Aidan » 15 Oct 2015, 16:58

Simon Baxter wrote:Give in to the sensible side, a world of not worrying about constantly swapping tyres about..
Give in to a world of having one spare, a world where you use less fuel, a world where driveline components last longer..


sorry Simon but the last statement

NOT

a world where rear crown and pinion sets take all the load and wear much faster - I have seen the wear on decoupled boxes and it's generally worse; Audi make all 150+bhp vehicles 4wd to spread the load even if only part time like we do with a VC - remember the lower wear level on syncro cv/shaft interfaces, that's not because VW specified better fit shafts and cvs on syncros it becasue they are not subject to the same loads as on 2wd

fuel consumption is the same, same rotating masses, unless VC is tight

one spare in rotation

the only practical reason to have one is to make on the floor axle maintenance easier

the rest is just knob waving imho :lol:
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Re: Decoupler kits

Postby xriss » 15 Oct 2015, 17:10

got a couple of nose cones sitting on the shelf here if required by anyone.... :)
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Re: Decoupler kits

Postby syncropaddy » 18 Oct 2015, 19:08

Aidan wrote:
the rest is just knob waving imho :lol:


Yes indeed and there's plenty of that type of thing from the 'experts' on 'tinternet !!

Anyway Aidan, I'll have ten please and please package them in a really heavy galvanised steel container when you are sending them over. I need a decent mooring for my boat!
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Re: Decoupler kits

Postby scaltura » 19 Oct 2015, 06:38

syncropaddy wrote:
Aidan wrote:
the rest is just knob waving imho :lol:


Yes indeed and there's plenty of that type of thing from the 'experts' on 'tinternet !!

Anyway Aidan, I'll have ten please and please package them in a really heavy galvanised steel container when you are sending them over. I need a decent mooring for my boat!


:rofl
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Re: Decoupler kits

Postby vw-kern » 22 Oct 2015, 14:01

Simon Baxter wrote:Give in to a world where you use less fuel...


In fact it’s the other way around. An engaged Decoupler (2WD-Mode) brings slightly higher fuel consumption.
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Re: Decoupler kits

Postby silverbullet » 22 Oct 2015, 17:27

Thats what I thought. Pushing a "dead" front diff/VC/prop is an inertial(?) load on the engine.
Audi found that the ur-quattro was actually better on fuel than the 2wd coupe with the same engine iirc
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Re: Decoupler kits

Postby Simon Baxter » 23 Oct 2015, 08:08

Really?
Surprises me that.
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Re: Decoupler kits

Postby silverbullet » 23 Oct 2015, 11:44

Definitely recall reading that. Something to do with less wheelspin/tyre slip/scrabble under acceleration etc

Decouplers. Always controversial :lol:
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Re: Decoupler kits

Postby syncropaddy » 23 Oct 2015, 19:23

Yes and I read the same thing in an engineering journal of the day long before willy waving, misinformation and ill formed opinion cluttered the information highway!

However, de-couplers have never been controversial, expensive, useless carp, yes, controversial, no!

:roll:
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Re: Decoupler kits

Postby vw-kern » 23 Oct 2015, 20:53

Sorry for the bad quality, still trying to get a better copy.

In 1985 there was an article in the “ATZ – Automobil Technische Zeitschrift” (http://www.atzonline.com/) about the new T3 Syncro. SDP tested there also the Decoupler vs permanent 4WD. And that’s what the found out:

Image

Of course it’s in german, but I’ll try to translate the most important sentences:

5 Driving Performance
[...]During the development [of the T3 Syncro] the influence of decoupling the front differential has been examined. Fig. 17 shows the difference of the fuel-consumption-curve of the VW Syncro with tyres 205 R 14 and gearing 38:7 between 4WD and [decoupled] 2WD. Particularly at higher speed we see the definite advantage of the permanent 4WD. The reason for this can be distinguished in the lower rolling resistance and slippage losses […]

The full article can be found here:
https://shufti.files.wordpress.com/2010/05/atz_87_1985.pdf
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Re: Decoupler kits

Postby silverbullet » 23 Oct 2015, 22:34

You're better off with a fresh VC and trouser the difference :mrgreen:
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Re: Decoupler kits

Postby vw-kern » 24 Oct 2015, 09:07

silverbullet wrote:You're better off with a fresh VC and trouser the difference :mrgreen:


I think in reality you won't see any difference. 3% savings with a working VC is to less to be recognized.

But one is for sure: A decoupler is not a Fuel-Saver!

P.S: I also got a decoupler refitted and I think it's a nice feature - but a permanent 4WD with a working VC is even better. :wink:
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Re: Decoupler kits

Postby syncropaddy » 24 Oct 2015, 13:43

vw-kern wrote:
silverbullet wrote:You're better off with a fresh VC and trouser the difference :mrgreen:


I think in reality you won't see any difference. 3% savings with a working VC is to less to be recognized.

But one is for sure: A decoupler is not a Fuel-Saver!

P.S: I also got a decoupler refitted and I think it's a nice feature - but a permanent 4WD with a working VC is even better. :wink:


silverbullet wrote:You're better off with a fresh VC and trouser the difference :mrgreen:



I've been saying that for years and no one believed me ..... They probably wont talk to you now and think you're a w-anker
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