my take on torque, (hopefully the final answer)

[bob.rossato at att.net]

I guess I'm leaning in the camp of length matters (don't go there), it's just 
that I always kept forgetting that the torque wrench no longer pivots about 
it's head when the 2079 extension is in place.  In any case, to corroborate 
Phil's numbers here is the info for the AAN from the Bentley manual for 
the '92-'97 100/A6 including S4/S6.  This manual is nothing more than a 
reprint of the Official Factory Repair Manual:

-------
Tightening Torque:
With spanner 2079:  350 Nm (258 lb-ft)
Without spanner 2079  450 Nm (332 lb-ft)

Coat threads and contact surfaces of bolt head with sealing paste AMV 188 001 
02

Note: Spanner 2079 for vibration damper must align with torque wrench.
-------

In addition, to provide credence to the theory that the length of the torque 
wrench matters to the torque setting when using an extension, here is the 
info listed for torquing the viscous fan on the AAN, which also can be done 
with an extension:

-------
Install viscous fan using torque wrench 1331, and fork wrench 3312.

Tightening torque:
Using torque wrench 1331 and fork wrench 3312  37 Nm (27 lb-ft)
Without fork wrench 3312   70 Nm (52 lb-ft)

Note:  If other torque wrenches are used, refer to the following chart for 
proper tightening torques:

Torque wrench length
(center of socket to center of handle)
220 mm   33 Nm (24 lb-ft)
280 mm   37 Nm (27 lb-ft)
300 mm   39 Nm (29 lb-ft)
440 mm   45 Nm (33 lb-ft)
-------

Let's put aside for a minute that the values seem to be backwards (at least 
to me), but rather that Audi is listing different torque values for different 
length torque wrenches.

Bob

> > Didn't Phil get it from an UrQ fiche that had with/without 2079 specs?
> > These being the 350/450 Nm or 258/332 ft-lb numbers?
> 
> The ur-quattro _microfiche_ only gives the value with 2079.
> 
> The with/without numbers come from the ur-quattro 20V documentation (RR engine) 
> which is on
> paper.
> 
> http://www.isham-research.com/quattro/torque.html names several other methods 
> and their
> sources towards the bottom of the page.
> 
> --
>   Phil Payne
>   http://www.isham-research.com
>   +44 7785 302 803