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ZeDefender



Member Since: 15 Sep 2011
Location: Munich
Posts: 4731
Germany 2011 Defender 110 Puma 2.4 SW Baltic Blue
Fast motorway tyre pressures?
Quick straw pole...

Any suggestions about ST/Maxx 265 R16 tyre pressures for distance motorway driving in a 110? I'll be covering 1500km traveling 120-140 km/h.

I usually run at 28/32 (unloaded) but I'm wondering if e.g. 35/40 would save rubber/fuel etc. with a "full house". Not sure about the "physics"...

Cheers for any advice.
Matt Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing...
Post #249018 4th Jul 2013 1:34pm
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foxkilla



Member Since: 01 May 2009
Location: J23 M1
Posts: 156
United Kingdom 2008 Defender 110 Puma 2.4 USW Auto Tonga Green
Personally I use 30/40 for high speed motorway driving even when towing.
27/38 normal use.
Post #249027 4th Jul 2013 2:23pm
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ZeDefender



Member Since: 15 Sep 2011
Location: Munich
Posts: 4731
Germany 2011 Defender 110 Puma 2.4 SW Baltic Blue
Cheers Thumbs Up Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing...
Post #249039 4th Jul 2013 3:40pm
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Arierep



Member Since: 12 Apr 2013
Location: Portugal
Posts: 258
Portugal 1995 Defender 90 300 Tdi SW Alpine White
On my 90 I tend to use on all 4 wheels 1.9/1.8Bar for offroad, 2.1Bar for general local driving (mostly cobberstone roads) and used to pump up to 2.4Bar for motorway cruising.

Whith my 7x16 rims on 235/85 BF ATs I was getting uneven tyre wear and no rear fuel saving improvements at motorway speeds. The tyre's cross section was getting rounded because of the inlfation.

Now I just leave them at 2.1Bar or pump slightly to 2.2 for the motorway, and just let the heat from the higher speeds to increase the pressure naturally.
Post #249230 5th Jul 2013 12:24pm
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BigWheels



Member Since: 21 Mar 2010
Location: Somerset
Posts: 1405
United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Tonga Green
Very exact figures! Do you use digital or dial pressure gauges? Land Rover Defenders. 67 years heritage, minimal appearance changes, still going strong all over the world. Not a fashion vehicle, but fashionable to own. Made for the needy, not the greedy. Ta ta Defender
Post #249236 5th Jul 2013 12:32pm
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Kraut



Member Since: 28 Dec 2011
Location: Westphalia
Posts: 336
Germany 2010 Defender 110 Puma 2.4 SW Santorini Black
I'm going on 2,1 bar front and 2,3 at the back with 265 summer tires, never change when loaded, just gets too bumpy and most of the defender tires have reinforced sides anyway, so had no problems yet.
Doing 25.000 km per year mostly on motorways/Autobahn with permanent speeds up to 150/160 kmh (depending on winddirection and slope Rolling Eyes ). I haven't realized much tire wear yet, seems to be a good compromise between durability and comfort
Post #249297 5th Jul 2013 3:32pm
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ZeDefender



Member Since: 15 Sep 2011
Location: Munich
Posts: 4731
Germany 2011 Defender 110 Puma 2.4 SW Baltic Blue
Well, I learned a lot today. Somehow I started the journey (cold in Germany) at 4am with 35/40 psi and finished (very hot in Spain) with... 41/46 Shocked

Cheers all and good point Jose Smile
Never realised the difference between cold/hot would be that big! I'll be letting some air out tomorrow morning - the good weather can do the rest Thumbs Up Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing...
Post #249379 5th Jul 2013 7:56pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324
United Kingdom 
Surely listed tyre pressures are for use when cold, which allows for heat build up after driving? The ambient temperature will be largely irrelevant - the temp difference you've noted will be down to the distance you've driven. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #249382 5th Jul 2013 8:04pm
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ZeDefender



Member Since: 15 Sep 2011
Location: Munich
Posts: 4731
Germany 2011 Defender 110 Puma 2.4 SW Baltic Blue
I recon I got the tyres up to nearly max temperature after a few hundred km...
I wonder what the "target" pressures should be? Could then work backwards Wink Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing...
Post #249387 5th Jul 2013 8:12pm
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tacr2man



Member Since: 02 Oct 2008
Location: J10 M40
Posts: 20
Its abit long winded but you can work out what optimum tyre pressures for any given load by trial and error .
Take tyre pressure before journey. record pressure at end (that is if the journey is over about 10/20 miles)
If the tyre pressure has increased by more that 6 psi then you started at Xpsi below the optimum that you are above the 6psi increase. If the tyre fails to reach the 6 psi then it was X psi above the optimum that you are below the 6 psi . HTSH
Post #249600 6th Jul 2013 7:23pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5843
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I tend to run 36psi all round regardless of load. 235/85 16 BFG AT. 110 / td5 sw. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #249611 6th Jul 2013 8:05pm
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Arierep



Member Since: 12 Apr 2013
Location: Portugal
Posts: 258
Portugal 1995 Defender 90 300 Tdi SW Alpine White
In fact ambient temperature can change tyre pressure, but lets not go that way.

The problem is that I belive that people tend to forget that at highway speeds the tyres heat up a lot, and with that heat comes the extra pressure. Try to touch your tyres in various situations and you'll the notice the temperature variation.

I once started a 100km motorway run (+-110km/h) with 2.15Bar, and ended with over 2.5Bar. At 2.5Bar the tyre is already getting a weird shape, imagine if I started with the high pressures some guys use.

By the way, I measure with an ARB analogic gauge or a Schwalbe digital, depending on the situation. Both quite precise
Post #249757 7th Jul 2013 3:39pm
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