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RegG
Member Since: 24 Aug 2012
Location: Nottinghamshire
Posts: 57
  
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| Tyre Pressures and Fuel Consumption |
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I seem to recall reading somewhere on the forum that running the D4 on the tyre pressures quoted for a full load noticeably improves the fuel consumption - unfortunately I can't seem to find the thread, unless I was dreaming it!
Has anyone noticed improved economy by raising the tyre pressures to the max recommended? Or, alternatively, what pressures are people running their D4's on?
Cheers  2017 Discovery Sport HSE, Firenze Red
Previous Land Rovers:
2012 D4 HSE, Ipanema Sand - STOLEN Nov 2017
2010 Freelander 2 HSE TD4, Biscay Blue
2007 Freelander 2 HSE i6, Stornoway Grey
1991 Discovery 200 TDi, blue
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 28th Dec 2012 11:14 am |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10548
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Fuel consumption is but one element in the cost of using your car.
Greatly over or under inflated tyres will have a shorter life than tyres inflated correctly.
Small variations in tyre pressure may impact on fuel economy, but read this article:-
http://theframjak.hubpages.com/hub/tire-pr...lly-matter
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 28th Dec 2012 11:36 am |
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DiscoJools
Member Since: 31 Jan 2008
Location: Mornington Peninsula
Posts: 132
 
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Higher pressures also mean less grip. There seems to be a culture down here in Aus of running very high pressures in search of economy and they say grip. there can only be less grip with less of the tyre in contact with the road. Most tyre fitters here will put 45 psi or more after fitting or repairing no matter what the manufacturers pressures should be . In my opinion very dangerous and I and some of my friends have nearly come a cropper when finding out that we had less grip than we thought especially in the wet! I run both my defender and D4 at recommended pressures + or - 2 psi. Best grip and best ride.
Certainly increase the rears when towing or loaded up.
Discojools. 2.7 D4 eDiff, Traxide Dual battery, Safari Snorkel...Opposite Lock winch bar..extra set 17" wheels with 245/70/17 BFG KM2 MTs..Warrior winch..Long range tank.
1982 2dr RRC renovated.
1983 Range Rover 2dr fitted with 300Tdi (with bigger turbo), 40mm body lift, Warn 9000i winch and BFG MT 265/75/16. Rear Maxidrive locker
1976 Landcruiser BJ40 with tipper body for the farm!!
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| 30th Dec 2012 2:59 am |
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IndusD4
Member Since: 01 Dec 2011
Location: Sydney, NSW
Posts: 308
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I did a defensive driving course at Eastern Creek (Sydney) last year, the guy (ex racing driver) running the course says that with the steel belts in modern tyres they don't tend to balloon like they used to, therefore you would be able to run them at much higher pressures yet still maintain excellent contact with the road. His arguments are better fuel consumption and better tyre wear. I run mine a little higher at 40PSI on bitumen and the tread wear after 24,000km is very even on all tyres.
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| 30th Dec 2012 7:42 am |
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amazing
Member Since: 05 Mar 2011
Location: chengdu
Posts: 1542
 
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Dont do it...braking distqnce on rough surfaces will increase. The ride will suffer on concrete roads very noticable.
And tyres will take longer to reach temp.
Long trips high speed./load yes mainly to prevent overheating( ref. Firestone usa issue)
Kickin round the doors...no
On wrangles i was lazy from last trip and did not reduce back down for a while..no mpg benefit. Ride harsher.abs on a hair trigger.
But the pressue chart is obviously based on very general use. If you have a specific use then they may not apply.
A tyre brand change will have a greater mpg effect.( good and bad) It is better to have and not need it then need and not have it.
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| 30th Dec 2012 10:03 am |
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pinhead
Member Since: 20 Dec 2010
Location: yorkshire
Posts: 877
 
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run manufactures figures plus 2-3 psi it does help but not much but the main improvement is tyre wear it no longer wears the edges out first Club original turbo
161k and counting
general AT's, oval timer, blanked egr's, silicone intercooler hose's
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| 30th Dec 2012 10:09 am |
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