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tyre pressures - cold to hot
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al cope
 


Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 8994

England 2016 Discovery 4 3.0 SDV6 SE Tech Auto Loire BlueDiscovery 4
tyre pressures - cold to hot

We all know that tyre pressures increase when the tyre is hot, but I didnt realise just how much. For those that tow with the D3 and D4 its has been the case to raise the rear tyre pressures, I know I have, usually to 41psi, but after finding that running on 275/45/21's a better ride was gained by running at 39psi (these being cold PSi numbers). I just happened to check the pressures (via the dash) after a couple of hours towing, so hot tyres, and they were are 45psi - so 6PSi up. Didnt realise it was that much of an increase.

Al
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Post #184739915th Aug 2017 8:59 am
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D&G
 


Member Since: 29 Jun 2017
Location: Charente 16480
Posts: 682

France 2006 Discovery 3 TDV6 HSE Auto Barolo BlackDiscovery 3

That is interesting. I put mine at 41 psi when towing my digger. Total trailer weight bang on 3.5t.

19 mpg or less with that on the back.
 

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Post #184741315th Aug 2017 10:01 am
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RRSTDV8
 


Member Since: 07 Apr 2014
Location: Here
Posts: 2477

United Kingdom 

Rule of thumb is 1psi rise per 5 deg C rise in temp. So your tyres were 30deg C warmer after your trip. It would have been interesting to know what the pressure would have been if you'd run them at the higher initial pressure.

A good reminder of why checking and adjusting tyre pressures as the weather changes through the year is also important.
 Visiting from rrsport.co.uk
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Post #184753815th Aug 2017 3:23 pm
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peteyd
 


Member Since: 08 Mar 2016
Location: South Bucks
Posts: 502

England 2016 Discovery 4 3.0 SDV6 Graphite LE Auto Loire BlueDiscovery 4

Thread resurrection...

During the cold snap, my TPMS said one of my tyres was a bit low. Now it has warmed up, it is no longer too low.

Is there an ideal temp for setting the tyre pressure, or should they hit the required pressure at whatever the current running temp is?
 MY16 D4 Graphite in Loire Blue  
Post #19236347th Mar 2018 7:56 pm
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