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David M
X-TRAIL FANATIC
Date Registered: 02-2005
Location: Taylor's Hill (Melbourne)
TOTAL POSTS: 466
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Re: Tyre Pressure
Holly,
Mine are 15" so contain a different volume of air and maybe a little different, and the tyre dealer just told me this morning I should run them at 40 psi. Remember that by the time you've driven to the service station you've warmed them up, and this adds about 4 lbs from what I can gather. On a long trip, such as highway driving between capitals, adding a bit will help the fuel economy. In any case, at the service station I'd be putting about 4psi more than what's recommended on the placard (especially if you're filling it up with stuff). You will probably feel the difference in the ride - he said this morning that firmer is better for the tyres - lowering them is the compromise for a softer ride. A tyre dealer should be able to tell you if the pressure has been too low or too high because the tyre wear will show up on either the shoulders (too low) or the centre (too high).
--- David M (X095)
ST Auto (series 1) 180,000 kms
Nissan nudge, fog lights, towbar, floor mats, K&N filter, Cooper CS4s, electric trailer brake controller, GME TX3220
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11/Apr/2006, 2:16 pm
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David M
X-TRAIL FANATIC
Date Registered: 02-2005
Location: Taylor's Hill (Melbourne)
TOTAL POSTS: 466
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Re: Tyre Pressure
40 psi when the tyres are hot. Brett, I reckon it seems high too and I pointed out that after 20,000kms the tyres are wearing "flat and even" (their words) at my usual 36 hot, but he stuck to his guns. On bitumen he's probably right - going onto gravel and dirt roads I think I'd let them down a bit. That's why I suggested to Holly to try adding 4 lbs to the tyre placade rather than 8.
--- David M (X095)
ST Auto (series 1) 180,000 kms
Nissan nudge, fog lights, towbar, floor mats, K&N filter, Cooper CS4s, electric trailer brake controller, GME TX3220
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11/Apr/2006, 5:34 pm
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BRETT72
X-TRAIL HOLIC
Date Registered: 10-2005
Location: Orange. NSW.
TOTAL POSTS: 1999
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Re: Tyre Pressure
One thing I forgot to mention. Never rely on the old service station tyre gauge for an accurate reading. Before I went to Canberra last week, I pumped all my tyres up using the servo hose. I then checked each tyre with my 'good quality' tyre gauge and it showed that instead of 32psi, there was 38psi instead. These were cold readings as the servo is just around the corner and it was -1 degrees.
I use the 'Bushranger 3 in 1 tyre gauge', as this was voted the best last year in a comparision guide. This little gadget, priced at $35, has a top quality tyre pressure gauge, and an easy deflating tool, but I never understood what the 3rd thing it could do was ???
As for deflating tools, you can go past the 'Staun' deflators. Simply set to a predetermined pressure and screw on to each tyre. You get 4 in a pack, so it takes about 10min to lower all tyres.
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11/Apr/2006, 6:50 pm
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Rybky
X-TRAIL LEGEND
Date Registered: 08-2005
Location: Sydney
TOTAL POSTS: 542
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Re: Tyre Pressure
Correction to me previous post, the recommended pressures for the Ti standard tyres is 29psi not 32psi as I stated. I was thinking of my previous car!
I am confused by this talk of measuring tyre pressure when the tyres are hot, I was also taught to measure pressure when cold not hot. When measuring while hot, how do you know that they are the same temperature every time you check them??
- Adam
--- - Adam (MY04 Titanium Ti-L)
Full Hi-Tech exhaust,Koni shocks,Whiteline rear s/bar,front strut bar,K&N filter,eyelids,Pioneer DVD+iPod+Veh Dynamics+rear view camera
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12/Apr/2006, 3:39 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Tyre Pressure
quote: BRETT72 wrote:
This little gadget, priced at $35, has a top quality tyre pressure gauge, and an easy deflating tool, but I never understood what the 3rd thing it could do was ???
I think they count continuous and intermittent rapid tyre deflation as 2 things it can do, in addition to the yre guage, so thats the 3 in 1
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12/Apr/2006, 6:00 pm
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Canadas FarEast
BANNED USER
Date Registered: 10-2005
Location: Newfoundland Canada
TOTAL POSTS: 395
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Re: Tyre Pressure
quote: Rybky wrote:
Correction to me previous post, the recommended pressures for the Ti standard tyres is 29psi not 32psi as I stated. I was thinking of my previous car!
I am confused by this talk of measuring tyre pressure when the tyres are hot, I was also taught to measure pressure when cold not hot. When measuring while hot, how do you know that they are the same temperature every time you check them??
- Adam
I'm with Adam on this point.
Many, many moons ago, I worked for a tire Company (Firestone) and learned that it's "almost useless" to measure tire pressure when they are hot....one will never get an accurate reading.
Cold is the way to go. Fortunately for me, I have an air compressor and do any required adjustments (weekly - except in Winter) in my driveway, early morning (before first drive).
If you have to go to the servo for air - here's a hint:
Check and note all tire pressures before driving to the servo. As an example, let's say the front right measures at 30 lbs. (before you drive to servo) and you want 32 lbs.
When you arrive at servo, re-measure pressures before adding any air. Let's assume it now reads 31 lbs. Given that you wanted an increase of 2 lbs (30 to 32) you should add the 2 lbs and bring it up to 33 lbs.
Re-check the pressure next morning (cold and before driving) and it should read pretty close to your desired 32 lbs.
In the absence of a compressor, this is a reasonable work-around that seems to work...
Cheers = Roger
BTW, I mentioned earlier that I was going to "experiment" with tire pressures with a view to improving fuel mileage.
I've run my 16s for about 2 weeks now at 34 lbs. (+2 lbs) and have indeed seen a "marginal" improvement - - every little bit helps.
I'll put my 17s on next month and will have to play some more to see what's best for them...........
Last edited by Canadas FarEast, 13/Apr/2006, 8:50 am
--- Roger
X 228
2006 X-T Bonavista Edition
Production Number 0001
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13/Apr/2006, 8:43 am
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