I found this parameter in VCDS under AWD Controller "Adaptions" I think, has anyone ever heard of it?

 

Google searching gets lots of hits but nobody really seems to know what it really is and its confused by having various different names.

 

Mine has 4 different parameter options, 2 for diesel and 2 for petrol, mine is diesel and both of them were not activated but one of the petrol ones was activated with a figure of 1750, I think the values ran from 1000 to 5 or 7000 so they could be RPM.

 

Reading between the lines it could be that the Haldex disconnects above a certain RPM threshold in the higher gears, others think that its to make it come on fully below certain RPM's to react like a RWD car, that may be the case on earlier versions where the parameter did not say "Anti Drone"

 

My car has always had a drone above 70mph, I thought it was because I had ran the diff without oil but I have done 30K miles since correcting that mistake and the diff hasn't siezed or got any worse, I have a new rubber coupling to fit as I thought the old one had split around its circumference but the new one shows it is manufactured like that so I am holding off.

 

I am a bit concerned about playing with the values and that my Haldex appears to be programmed for petrol & not diesel Anti Drone, maybe I should just try disabling the pump and seeing if the droning goes or does the pump disengage the coupling? I will read the self study guide tonight for more info.

 

If it gets rid of the noise I am quite happy to have FWD only above 70mph.

 

Hopefully someone else will have seen this parameter and had a play.

 

 

Very interesting J.R.   Have you seen this thread...?  https://www.t6forum.com/threads/t6_measured-a-comparison-of-4motion-traction-modes.35259/#post-483767

Yes, amongst many others, the parameter description was different yet again but I think its the same thing, it was from that article I drew my very speculative conclusion that the anti-noise measure is allowing the coupling to freewheel at resonant speeds, I don't think that mine is 100% engaged at lower speeds.

 

I will have a play but around here I would have to go on the péage autoroute to test it and being blind in the left eye I daren't do it with the laptop connected to VCDS.