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MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

That sounds very similar to my previous 2 'hard' L322s Graeme.

This 405 definitely has more movement than that but it doesn't 'oscillate' I.e. continue bouncing when I take my hands off and stop applying pressure.

2nd Aug 2023 7:31am

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

Just stopped by at my local tyre retailer and I spotted a 405 in having new tyres.

SDV8 on 22s and according to the owner 'most comfortable car I've ever owned, I love it'

Told him about mine and his face was scrunched up with disagreement so I guess he really does mean what he says about his.

(I was stopping by as I wanted my guy there to re check all the alloys for any buckles or flat spots just in case it's that upsetting the CVD system. They were too busy to help today unfortunately)

Last edited by MarianaWestminster on 6th Nov 2023 12:23am. Edited 1 time in total

4th Aug 2023 12:06pm

GraemeS

Member Since: 07 Mar 2015
Location: Wagga area
Posts: 2312

2012 Range Rover Autobiography TDV8 Bournville

MarianaWestminster wrote:
This 405 definitely has more movement than that ...

Considering that the bypass valves are closed whilst stopped, I can't help thinking that there must either be free-play in the shocks or they're quite worn-out to be able to move them. It's quite difficult to get any movement out of good condition conventional shocks on a large vehicle such as a D4, let alone shocks with a bypass valve to allow them to be softened when required and with very firm fixed valves in the piston.
Unfortunately an on-vehicle shock tester would likely give false results due to the bypass valve always closed.

4th Aug 2023 12:38pm

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

I do agree with your logic Graeme but I did replace all 4 shocks with brand new ones (bwi at the front and bilstein at rear) on my previous L322 and it literally made virtually no difference.

It'd say the improvement was just about equal to letting 1 psi of air out of each tyre

4th Aug 2023 3:25pm

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

Can anyone check something for me via IID tool?

Live data, CHCMB, active roll control status -
Cornering detected

Can you have a look when at standstill and see what yours says?

Mine says yes when stood still... does it think I'm cornering even though I'm not moving?!

Click image to enlarge

4th Aug 2023 7:45pm

PhillV8s

Member Since: 03 Jun 2022
Location: Worcestershire
Posts: 21

2013 Range Rover Vogue SE SDV8 Aintree Green

Just looked when sat on the drive. It’s a no from me. Maybe good news as in something to investigate…

Click image to enlarge

2013 SDV8 4.4 Vogue SE Aintree Green
2005 Maserati Gransport Giallo Grantourismo

4th Aug 2023 8:07pm

GraemeS

Member Since: 07 Mar 2015
Location: Wagga area
Posts: 2312

Check the other status too.
I understand there's a lateral+longitudinal accelerometer under the centre console and maybe its out of calibration but I would then expect the side-slope status to show as yes.

4th Aug 2023 9:54pm

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

Thanks Phil, that's a big help.

If anyone else could also check just to make sure that would be fantastic!

I will check the side slope status tomorrow Graeme

4th Aug 2023 10:20pm

aljo

Member Since: 04 Jul 2018
Location: west sussex
Posts: 198

2019 Range Rover Vogue SE 2.0 PHEV Santorini Black

Will check the status on mine shortly 👍 Last night I lay in bed looking up at the stars in the sky and I thought to myself, where,s the f**king ceiling!!

5th Aug 2023 9:39am

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

Thanks Aljo,

Does yours have the hydraulic roll bars with being a PHEV?

5th Aug 2023 9:53am

Kot

Member Since: 10 Mar 2021
Location: broadland
Posts: 1093

GraemeS wrote:
Check the other status too.
I understand there's a lateral+longitudinal accelerometer under the centre console and maybe its out of calibration but I would then expect the side-slope status to show as yes.

Is this any use to you Mariana? extract from recent post see last sentence.

evotime wrote:
So investigated the sloppy ride. All suspension is good.

I found a bit of information on how the suspension reacts when driving around town (below 30mph) and it would suggest there is little or no damping force applied in the earlier cars. This changed in 2016 onwards(I think, it was maybe 2015). For the life of me I cant find the document again.

This certainly tracks with how my car behaves. In the town its sloppy and shoogles you from side to side if you hit an undulation like its underdamped. Out on the open road (and every other situation) it handles impeccably, corners so flat I cant believe how good it is when nipping on.

I have gotten used to it.

Is it Vehicle Dynamic Suspension 204-05 Overview starting page 5?

Adaptive damping is an electronically controlled suspension system which
continuously adjusts the damping characteristics of the suspension dampers
in reaction to the prevailing driving conditions.
The system is controlled by an Integrated Suspension Control Module. The
module receives signals from three accelerometers, four suspension height
sensors and other vehicle systems to calculate vehicle state, body and wheel
motions and observe driver inputs. These signals are used by the control
module to control the damping characteristics of each damper to the
appropriate level, resulting in improved body control and vehicle ride.

The adaptive damping dampers are oil-filled, gas pressurised mono-tube
units. To maintain wheel travel, the rear dampers feature an additional
external accumulator. The damping force can be adjusted when the vehicle
is being driven by an electronically controlled valve. These dampers provide
an improved compromise between vehicle control and ride comfort than a
typical passive damper. All the dampers have an electrical connector on the
end of the piston rod, in the centre of the top mount.
In each damper, the damping adjustment is made by a solenoid controlled
variable orifice, which opens up a secondary path for oil flow within the
damper. When de-energized, the bypass is closed and all the oil flows
through the main (firm) valve. When energized, the solenoid moves the
armature and control blade. A spring returns the valve to its closed state
when de-energized. The control blade incorporates an orifice which slides
inside a housing to open up the bypass as required.

With the comfort valve energised and the damper moving into compression,
some of the oil flows from the lower portion of the piston through:
a hollow piston rod,
a separate soft (comfort) valve,
a slider housing and orifice,
into the upper portion of the damper, thereby bypassing the main (firm)
valve.
In rebound, the oil flows in the opposite direction. The two valves acting in
parallel allow the damper to operate in a softer state.
The damper operates between these two boundary conditions.

The solenoid in each damper is operated by a 526 Hz PWM (pulse width
modulation) current demand from the Integrated Suspension Control
Module. When fully energized, the control module applies a 1.5A current to
operate the damper in the soft setting. When de-energized (0.0A), the
damper transfers to the firm setting. The current varies continuously as
required to increase and decrease the damping individually in each of the
dampers.

And then goes on about the INTEGRATED SUSPENSION CONTROL MODULE and accelerometers, height sensors etc which all play a part. 2018 SE SDV8 4.4 Byron Blue

5th Aug 2023 10:13am

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

Thanks Kot,

I've had a read of that extract before in the WSM so have a bit of an idea how the system operates.

GraemeS, side slope detection is a no:

Click image to enlarge

5th Aug 2023 11:11am

aljo

Member Since: 04 Jul 2018
Location: west sussex
Posts: 198

MarianaWestminster wrote:
Thanks Aljo,

Does yours have the hydraulic roll bars with being a PHEV?

Sorry getting confused between dynamic mode and dynamic active roll bars which I don’t have on this vehicle 😂 Last night I lay in bed looking up at the stars in the sky and I thought to myself, where,s the f**king ceiling!!

5th Aug 2023 5:09pm

MarianaWestminster

Member Since: 14 Jun 2018
Location: UK
Posts: 593

No worries Aljo, thanks all the same.

Anybody else with an SDV8 check this for me?

5th Aug 2023 8:38pm

fisha

Member Since: 25 Sep 2009
Location: Scotland
Posts: 1243

2015 Range Rover Autobiography SDV8 Aruba

What is it you want checked ? V8 or else ...

6th Aug 2023 9:14am

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