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gg2201



Member Since: 21 Oct 2013
Location: Callington
Posts: 158

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black
Suspension query and oddity......

Doing the usual pre-mot checks before the car goes in and the BF noticed this oddity. He was a bit miffed as to whether it was just being a Land Rover or if it is a sign of a fault...

So the IID tool is showing no faults suspension wise. It has had a replacement offside front height sensor and nearside rear sensor. The brass filter on the pump has been cleaned and it has two brand new front Arnott airbags in the last 1000 miles. The front airblock behind the drivers wheel is also brand new.

So the offside front and nearside rear tyre are noticeably more compressed by the suspension then the other opposing two. The car is parked on a flat garage floor and the height calibrated by the IID tool. However in guided calibration we are unable to alter the height up or down by the arrows for the nearside front only. Every other wheel you can?? Manual calibration seems to work ok....

Is this normal? If you squeeze or push the airbag the side compressing the tyres are solid the opposing side you can actually just about get some flex in the bag by pushing hard.

All the tyre pressures at the recommended 33/36psi also......

Any ideas?

Images go offside front/nearside front then nearside rear/offside rear








 2011 4.4 TDV8 Autobiography

Post #500330 2nd Jan 2019 1:57pm
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dingg1



Member Since: 29 Jun 2013
Location: PORTUGAL
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2007 Range Rover Vogue SE 4.2 SC V8 Stornoway Grey

I don't know what your thinking is but the suspension settings has no influence on tyre pressures.
Looks to me one tyre could do with a bit air in maybe though.


Last edited by dingg1 on 2nd Jan 2019 2:17pm. Edited 1 time in total

Post #500334 2nd Jan 2019 2:15pm
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stan
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double check the tyre pressures again...it could be the valve is blocked and giving you a false reading..

Post #500336 2nd Jan 2019 2:17pm
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gg2201



Member Since: 21 Oct 2013
Location: Callington
Posts: 158

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

As above two fronts are at 33 psi and the rears 36 psi checked with two different pressure tests and also on his air compressor.... so it's not tyre pressure related Very Happy

Videos probably show better the difference in a crude way...

Nearside
https://youtu.be/o2GRaCEt_Wk

Offside
https://youtu.be/yy6KNcBbDRI 2011 4.4 TDV8 Autobiography

Post #500337 2nd Jan 2019 2:17pm
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Joe90



Member Since: 29 Apr 2010
Location: Hampshire
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England 

I believe this is physically possible (if not technically!)

One set of opposite corners without as much pressure being held in place by the other opposite corners, hence all the (most of) weight going down through the corners with decent pressure in the airbags.

Analogy: a 4 legged table with one (or two opposite the one) leg /s shorter than the other

Now as to the how this could happen I am still thinking about that! Engineers and scientists flame away Twisted Evil

I may have observed similar on my old FFRR but just put it down to tyre pressures / parking or steering position .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember Wink
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Post #500340 2nd Jan 2019 3:00pm
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GGDR



Member Since: 26 Nov 2016
Location: London
Posts: 3517

United Kingdom 2011 Range Rover Vogue SE TDV8 Stornoway Grey

Is the care on an incline and self-levelling?
Might create uneven pressure?
. Cheers, Greg
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2011 Vogue SE 4.4 with lots of toys in Stornaway

Post #500347 2nd Jan 2019 3:36pm
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Joe90



Member Since: 29 Apr 2010
Location: Hampshire
Posts: 6397

England 

Or does the car "think" it is on an incline ?

Or are the sensors on those corners reporting back incorrectly (but still within range, therefore no faults reported) ? .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember Wink
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Post #500361 2nd Jan 2019 5:51pm
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gg2201



Member Since: 21 Oct 2013
Location: Callington
Posts: 158

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

gonna_go_double_r wrote:
Is the care on an incline and self-levelling?
Might create uneven pressure?
.


This was in our garage which is as flat and level as any concrete slab would be Laughing

It's interesting the two corners pushing down hardest so to speak are the ones with the new sensors which are genuine parts. Confused 2011 4.4 TDV8 Autobiography

Post #500365 2nd Jan 2019 6:14pm
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Arbuckle



Member Since: 11 Nov 2018
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United Kingdom 2012 Range Rover Westminster 4.4 V8 Fuji White

+1 Joe 90, your analogy is sound.
Newton's 3rd law. Reaction is equal and opposite.

Are the measurements from floor to wheel arch equal all round / side to side?
The air pressure would be identical side to side ONLY if the vehicle mass is equally distributed side to side.

Imagine putting a few sacks of sand in the boot on just one side.
After self leveling, the airbag pressure on that side rear would have increased.
(with possible reduced pressure at the front due to 'equilibrium of moments') Forty years of progress. 1972-2012

Post #500371 2nd Jan 2019 6:46pm
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gg2201



Member Since: 21 Oct 2013
Location: Callington
Posts: 158

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

Aligned as much as possible within the LR tolerances as you can never get it perfect. 2011 4.4 TDV8 Autobiography

Post #500374 2nd Jan 2019 7:13pm
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