How to disable EDL?

If it has its own fuse, you could just remove the fuse. May I ask why you want to disable it?
 
It doesn't have a fuse, i just want to see if it makes any difference to the car in 1st gear

cheers
 
all i know is if you wield the differential your car is faster at drag racing and slower in the twisties
 
On the ross tech site:

"22-AWD – Purely Mechanical!
The quattro system in these cars is purely mechanical, no electronics at all. This address is used by the Haldex system used in transverse-engine cars like the TT, the A3, and various Golf/Bora models."