We have terrible roads round us, but the new shiney does seem to crash and bang through the pot holes more than the 322 did. Not a discernible knock as such but definitely slightly harsher ride over poor road surfaces. In my mind I’m putting it down to 275/45/21 wheel and tyre combo.

On the smooth it is fine. Had a feel about and a good look at the bushes and it all looks solid. I had a twiddle if the Arb drops and they are quite easy to turn. So possibly not as fresh as they could be but nothing untoward.

Not planning to swap out anything yet but was wondering what we’re the first items to go south on the front setup? There is nothing that can't be fixed with a hammer😜😜
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Tyre pressures OK ?

https://www.fullfatrr.com/forum/topic50490.html

After that it gets more expensive

https://www.fullfatrr.com/forum/topic40778.html

I drove for 45,000 miles on my original 21” rims on my very similar specced 405 and apart from its extreme tendency to tramline on motorway lorry ruts, I was quite happy with it. I bought a set of inexpensive 20” rims with the standard 255/55R20 tyres to use for winter wheels, but tried them with their standard M+S tyres and the car was transformed. The tramlining was gone, the ride made it feel like a different car and road surfaces and imperfections could be ignored. That was 36,000 miles ago and I’ve never looked back.

I noticed this with mine. Original set up was 22’ wheels with a 40 profile, swapped to 21’ with a 45 profile and noticeably better but still not perfect on poor surfaces. I’ve settled for that compromise at the moment as I like the style of the 21’ wheels and they do give an excellent ride on everything but really poor surfaces.

I think the ARC control module was updated for the 2016> cars, there is something in my mind about having 2 valves not 1 after a certain date. So I don’t think that’s it. Could be bushes on the ARC as I reckon that are under srain a lot.

Will check the tyre pressures. I think they may be too high. 44 rear rings a bell. So that may help.

I have a feeling it could be ARB drop links which is fine can do them for a few quids. There is nothing that can't be fixed with a hammer😜😜
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2021 Discovery 5 D300 MHEV commercial

What about the front suspension update / TSB ?

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

That I don’t know about?

Is there a TSB number and years it applies to. I thought they had put the updated parts on all the cars post 15? There is nothing that can't be fixed with a hammer😜😜
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2021 Discovery 5 D300 MHEV commercial

Checked the tyre pressures, were a high at the rear and about 38 at the front. So not too far out now set 34 front 37 rear. There is nothing that can't be fixed with a hammer😜😜
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2021 Discovery 5 D300 MHEV commercial

I don't know too much but I think early 405's have had knocking / roughness addressed with new components. Hopefully an expert will elaborate. But search and you'll find info Mark.
. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Ah, yes. I read about that. That’s the issue with the ARC control Module I think. Pretty sure mine should have the updated version.

 There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

I think it's more than electronics. I could be wrong though.

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Yeah, its the valve block.  There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

Here found something:

Quote:

2013-14 models may need to have inserts installed the subframe if there’s a knocking sound from the front suspension over uneven surface (LTB00625), and some might need updated front suspension lower arm bushings if there’s a thud/thump noise from the front suspension during heavy braking (LTB00573).

Also here which mentioned the valve block and also bushings etc

https://www.fullfatrr.com/forum/post275724.html Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Northern...did you get this sorted then with the valve block replacement? Is it an easy DIY or is there fluid/compressed system? 2014 FF Autobiography 5.0 SC
2008 FFRR (sold)
2008 BMW M5