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Old 4th January 2019, 15:14   #76
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Default Re: Changes in tire pressure - highway driving

I know the pressure gauge might be faulty at most of the places. I don't have much extreme usage of the tyres so my focus has been overall ride and handling of the car. Hence I found my own solution to the problem - consistency for each fill.

I try to fill air/nitrogen in my tyres from 1-2 fixed places unless I am travelling out of city for extended periods where I will need a refill within the trip. I have chosen this place after getting the tyre pressure checked at multiple places and finding the one which gave me the best experience during the ride. My assumption is that even if this particular gauge is at fault, the error will remain for each fill that I do at the same place.

Similarly, whenever I fill air, I make sure to do it at a place with a digital pressure gauge. My assumption - if there's any error in the gauge, it will be consistent across all the tyres. I have avoided the tyre walas with analog pressure gauge. Apart from faulty reading of the gauge, there could be more sources of error - zero error of the meter or parallax error by the user.

I fill up with nitrogen and find a 1-2 PSi drop over 4-5 weeks which is good enough for me. However due to lack availability, I have topped up with air as well on a couple of occasions.

Let me know if I am going wrong anywhere.
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Old 4th January 2019, 16:54   #77
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Default Re: Changes in tire pressure - highway driving

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Originally Posted by sukiwa View Post
How do we calibrate or what's your method for re-calibration?
The obvious answer is to find somebody who does calibrations. But that is neither practical or very cost efficient I dare say.

In my home country it is a little easier. MOT stations who perform annual checks on cars have calibrated gauges. They need re-calibration every year. The get checked regularly so these guys ensure that their equipment is working properly.

That is how I found out, my own gauge was way off.

From a practical point of view you can consider a couple of things. Gauges/manometer wear easily. So anything that has been used for a couple of years is likely to be off. A good gauge cost money. If you can buy, or use a (relatively) new gauge of some known good brand.

Compare the reading by using different gauges from different places. See if you notice any differences in reading. If you use five different gauges and three give a (near) identical reading, it is very likely that the correct pressure is somewhere near what those three are telling you.

Look at your tires before you inflate them. On most tires 0.4 bar too low tends to be visible, once you get a bit of an eye for it.

It’s good practice to feel the temperature of your tires after motorway driving. They should be warm to the touch, but not too warm. Tires heating up are a sign of under inflating (or sticky brakes).

But if you just checked your air pressure and then drive 100 km on the motorways, feel the tires and they are very warm, the gauge you were using is likely to be off by a good margin.

Good luck

Jeroen

Last edited by Eddy : 8th January 2019 at 21:52. Reason: typo
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Old 7th January 2019, 15:57   #78
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Default Re: Changes in tire pressure - highway driving

Before the start of the drive
Changes in tire pressure - highway driving-screenshot_20190107115521__01.jpg

After completing the drive
Changes in tire pressure - highway driving-screenshot_20190107151533__01.jpg

City speeds (max): 45 kmph
Highway speeds (max): 100 kmph
No. of persons in the car: Only me.
Ambient temperature: 29 degrees

Of the 77 kms, 45 kms was on the ORR maintaining speeds between 95-100 kmph and the rest 32 kms were inside the city.

Found an increase of 2psi in the front tyres and 1psi in the rear. The rear right tyre has a puncture. Will be getting that checked in the evening since the puncture kit is at home.

Last edited by a4anurag : 7th January 2019 at 15:59.
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Old 7th January 2019, 21:13   #79
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Default Re: Changes in tire pressure - highway driving

How accurate are portable inflators that work off the 12V socket? Any reliable ones?
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Old 8th January 2019, 21:43   #80
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Default Re: Changes in tire pressure - highway driving

Quote:
Originally Posted by a4anurag View Post
Before the start of the drive
Attachment 1834494

After completing the drive
Attachment 1834495
Ambient temperature: 29 degrees
Can you please clarify the reason behind increase in the tyre pressure of spare tyre? I understand it's only 1psi. But still.
Is that the temperature increment of 11 Deg caused the increase in tyre pressure?
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Old 8th January 2019, 21:53   #81
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Originally Posted by IndigoXLGrandDi View Post
Can you please clarify the reason behind increase in the tyre pressure of spare tyre?
It was 34psi so I asked the MRF guys to top it up to 36psi.
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Old 8th January 2019, 22:17   #82
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Default Re: Changes in tire pressure - highway driving

Quote:
Originally Posted by Chetan_Rao View Post
How accurate are portable inflators that work off the 12V socket? Any reliable ones?

I am using Coido 3326 for the last 5 years. No issues so far. My regular tire pressure checks are done at fuel stations/tyre shops though.
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Old 10th January 2019, 19:00   #83
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Default Re: Changes in tire pressure - highway driving

Quote:
Originally Posted by aspire View Post
You will damage your bearing, if you drive with tyres inflated above the recommended pressure.
Right, i had to replace one rear wheel bearing recently, however the dealer was recommending replacement since last 3 services for a high amount, got it myself from auto parts and installed at fraction of cost
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Old 10th January 2019, 19:12   #84
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Default Re: Changes in tire pressure - highway driving

Quote:
Originally Posted by IndigoXLGrandDi View Post
Can you please clarify the reason behind increase in the tyre pressure of spare tyre? I understand it's only 1psi. But still.
Is that the temperature increment of 11 Deg caused the increase in tyre pressure?
Quote:
Originally Posted by a4anurag View Post
It was 34psi so I asked the MRF guys to top it up to 36psi.
I always keep my spare tyre about 0,5 bar (7-8 psi) above the normal tyre pressure. Spare tyres just doesn't get checked for correct pressure as often as the regular tyres.

Over time, just about all tyres deflate, so adding a bit of extra pressure on the spare so it has a bit of buffer.

Jeroen
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Old 10th January 2019, 19:42   #85
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Default Re: Changes in tire pressure - highway driving

Quote:
Originally Posted by a4anurag View Post
It was 34psi so I asked the MRF guys to top it up to 36psi.
Quote:
Originally Posted by Jeroen View Post
I always keep my spare tyre about 0,5 bar (7-8 psi) above the normal tyre pressure. Spare tyres just doesn't get checked for correct pressure as often as the regular tyres.

Over time, just about all tyres deflate, so adding a bit of extra pressure on the spare so it has a bit of buffer.

Jeroen
Sorry if I was not clear enough.
I wanted to know the reason behind the increase in Spare wheel tyre pressure even though it did not run on the ground.

The temperature of Spare Wheel was 18 Deg and 29 Deg before and after the drive, respectively.
Hence I asked whether the increase of 11 Deg caused the tyre pressure of spare wheel to increase by 1psi.
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