Author Topic: Check tyre pressures  (Read 1710 times)

Kremmen

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Check tyre pressures
« on: December 07, 2021, 10:41:07 AM »
Just checked my tyre pressures and they had all lost 4 psi.

My Civic only used to lose about 2 psi between seasons.

Admittedly I haven't checked them since mid Sep.

Let's be careful out there !

Karoq

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Re: Check tyre pressures
« Reply #1 on: December 07, 2021, 10:57:50 AM »
I checked SWMBO's 12 reg Jazz last weekend and all were down. N/S/R was off the scale (we live 40 miles apart) otherwise I would have checked before it was too late.
Which it was. She had come from Sherborne to Poole with about 10psi.
cost her a new tyre!! Lucky it didn't cause her to go 'agricultural'!
Dip Mech Eng (automotive)

Jeff15

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Re: Check tyre pressures
« Reply #2 on: December 07, 2021, 11:30:05 AM »
It's amazing how much incorrect tyre pressure can affect your mpg....

Lord Voltermore

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Re: Check tyre pressures
« Reply #3 on: December 07, 2021, 11:36:49 AM »
The difference in winter psi  loss  between your civic and Jazz might be explained by Boyles law .
At a constant temperature  gas  pressure and volume have an inverse relationship.  Imagine squeezing an air filled balloon . Less volume results in a  higher pressure.   

Maybe a higher recommended pressure and tyre squishiness .or whatever ,makes a difference in how much temperature affects pressure.   

I have tried to fully understand boyles law, but it increased my blood pressure  >:(

 
 
« Last Edit: December 07, 2021, 12:01:50 PM by Lord Voltermore »
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madasafish

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Re: Check tyre pressures
« Reply #4 on: December 07, 2021, 12:01:57 PM »
Colder air shrinks.
So you need more air.

(My interpretation of Boyle's Law)

Kremmen

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Re: Check tyre pressures
« Reply #5 on: December 07, 2021, 12:14:32 PM »
That MPG loss is interesting as my recent fillup yielded 60.4mpg against the fibometer reading of 64mpg

Now my pressures are back to recommended and I'll be checking them far more often, I'll be interested to see what I get next time.
Let's be careful out there !

ColinB

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Re: Check tyre pressures
« Reply #6 on: December 07, 2021, 12:22:01 PM »
Checked mine last weekend prior to a long-ish trip. All were down a few psi so got out the trusty footpump. Halfway through inflating one tyre, the fitting connecting the hose to the pump broke leaving air p*ssing out of the hose. I'd lost  a sizable chunk of the air in the tyre before I got it all disconnected. Grrr! With no footpump to top it up, I drove very gingerly to the nearest garage air line. Replacement inflator now on order (rechargeable electric one to take the effort out of it).

Only now, recounting the tale, do I remember the electric inflator that's still in the original packaging in the boot of the car!

Kremmen

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Re: Check tyre pressures
« Reply #7 on: December 07, 2021, 12:55:28 PM »
These come and go on Amazon but I like it.

Fast fit connector, auto cut-off and no power leads to mess with :

https://www.amazon.co.uk/gp/product/B08KZSN79V/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've checked it against my fairly expensive metal digital pressure gauge and it reads 0.5psi high so I compensate.
Let's be careful out there !

ColinB

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Re: Check tyre pressures
« Reply #8 on: December 07, 2021, 02:10:55 PM »
These come and go on Amazon but I like it.

Fast fit connector, auto cut-off and no power leads to mess with :

https://www.amazon.co.uk/gp/product/B08KZSN79V/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've checked it against my fairly expensive metal digital pressure gauge and it reads 0.5psi high so I compensate.

Thanks. I remembered that you'd posted that before so I found the link but it's not available. There's an almost infinite number of similar devices from companies I've never heard of. Eventually went with this one ...
https://www.amazon.co.uk/Ring-Automotive-RTC2000-Cordless-Rechargeable/dp/B08ZSR8N5P
... from a brand I have heard of. Doesn't have the clip-on style of connector, but I have a spare one of those from the defunct footpump if necessary.

Kremmen

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Re: Check tyre pressures
« Reply #9 on: December 07, 2021, 02:14:16 PM »
Very similar.

The only reason I'd be put off is the screw on terminal. I've had screw on before and lost quite a bit of pressure, loads of hissing, as they don't come off quickly.
Let's be careful out there !

Wonder

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Re: Check tyre pressures
« Reply #10 on: December 07, 2021, 02:39:21 PM »
Hello,
but there shouldn't be the sensor that warns if the tire pressure is low?
Thanks for the info.
(Sorry for the mistakes, I used Goole Translator)

Kremmen

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Re: Check tyre pressures
« Reply #11 on: December 07, 2021, 02:50:33 PM »
The TPMS doesn't work like that.

It only triggers if one tyre loses more pressure than the others. In my case all tyres had lost roughly the same pressure so no fault detected.

I've pumped them all back to standard so I'm not expecting any warning.
Let's be careful out there !

Steve_M

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Re: Check tyre pressures
« Reply #12 on: December 07, 2021, 02:55:30 PM »
The TPMS doesn't work like that.

It only triggers if one tyre loses more pressure than the others. In my case all tyres had lost roughly the same pressure so no fault detected.

I've pumped them all back to standard so I'm not expecting any warning.

Deflation Warning System (DWS) will detect if all 4 tyres lose pressure, it's not just if one loses it.

Its the change between the initialised value and current that triggers the warning, it also uses a signal from the ambient temperature sensor as well, so can have a level of compensation.

culzean

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Re: Check tyre pressures
« Reply #13 on: December 07, 2021, 03:28:51 PM »
Very similar.

The only reason I'd be put off is the screw on terminal. I've had screw on before and lost quite a bit of pressure, loads of hissing, as they don't come off quickly.

If you pull the hose gently away from the valve when screwing the connector on and off it means that you actually lose less air than the connectors with the lever on them.  By pulling the hose it means you delay the pip in the connector hitting the stem of the valve and releasing air until the connector is pretty much screwed fully on, and likewise it means that when unscrewing the connector the pip leaves the valve stem almost as soon as you start to slacken the connector.. I have done this for years with very little loss of air.
« Last Edit: December 07, 2021, 03:45:42 PM by culzean »
Some people will only consider you an expert if they agree with your point of view or advice,  when you give them advice they don't like they consider you an idiot

Kremmen

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Re: Check tyre pressures
« Reply #14 on: December 07, 2021, 03:58:40 PM »
I had a screw on one many years ago and it was fine, but it broke.

I then bought a Michelin one about 7 or 8 years ago and I just couldn't remove it without losing loads of air.

Hopefully the Ring one is OK.
Let's be careful out there !

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