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Read the WELCOME ALL BMWFANATICS post.
DO YOU TRUST THE TYRE PRESSURE INDICATOR AT FUEL STATIONS???
- Thread starter Die_Miek
- Start date
MikeR
Well-known member
:fencelook: if you want to get technical then one has to compensate for air temp, road/tire temprature, car load - humidity.
:nonono: as long as all the tires are checked at the same time it should not make any difference to the ride, the only time you would have to worry is when you track to ensure the tires are correct pressure for when they expand under loaded conditions.
:nonono: as long as all the tires are checked at the same time it should not make any difference to the ride, the only time you would have to worry is when you track to ensure the tires are correct pressure for when they expand under loaded conditions.
0.4 bar is not a small difference in pressure... if checked cold the air in the tire should be the same as the air outside meaning there will be little to no difference in pressure readings on a cold day VS hot day...
yes but im sure the difference in running pressure on a hot day vs cold day will be very small... 0.4bar is not small and the tire chart is for cold pressure so if you measuring under warm tire conditions then you need to inflate more...
Philip Foglar
///Member
To answer the question, NO! I don't trust their pressure readings, plus, I reckon there is going to be a lot of moisture in the compressed. Personally I am a believer in using Nitrogen since it is more stable that air and you end up with far less moisture - provided your tyres aren't losing pressure all that often, the occasional pumping up with normal air from a mini air compressor is fine. Also, tyre pressures should be checked and adjusted when the tyres are cool and not been driven on moments before, so checking pressures at a garage is already not ideal.
S
SP33DYV
Guest
Nope, I keep a handheld gauge in my car and always double check before I leave the forecourt.
P
petrivanzyl
Guest
At least if you always go the the same garage the pressure will be consistently wrong so you can tell if the tyre is loosing pressure.
osiris
///Member
I have thought about this allot over the past few months and I have a theory but I am not sure how fitting it is.
Allot of garages these days have electric pressure gauges that automatically set your tire pressure for you once you key in what pressure you want, now what confuses me is the hose that goes from the source control box to your tire is pretty long and has pressurized air in it, now how can the thing give you an accurate reading if its not compensating for the pressure in the hose since all the hoses are different lengths and some are leaking so badly you can hear the air coming out, some are patched up etc etc, I recon the longer the hose the more inaccurate the pressure reading will be!
I don't know if this applies to the old style mechanical pumps, but still from the hand held thing with the little perspex window on it to the actual part that fits onto your valve! That pipe is also always different lengths and being mechanical how does it compensate for the air in the rubber pipe? and what if the rubber pipe is old and has too much flex in it?
I think carrying a hand held pressure gauge with you is the best and most accurate option as the garages differ allot!
Allot of garages these days have electric pressure gauges that automatically set your tire pressure for you once you key in what pressure you want, now what confuses me is the hose that goes from the source control box to your tire is pretty long and has pressurized air in it, now how can the thing give you an accurate reading if its not compensating for the pressure in the hose since all the hoses are different lengths and some are leaking so badly you can hear the air coming out, some are patched up etc etc, I recon the longer the hose the more inaccurate the pressure reading will be!
I don't know if this applies to the old style mechanical pumps, but still from the hand held thing with the little perspex window on it to the actual part that fits onto your valve! That pipe is also always different lengths and being mechanical how does it compensate for the air in the rubber pipe? and what if the rubber pipe is old and has too much flex in it?
I think carrying a hand held pressure gauge with you is the best and most accurate option as the garages differ allot!
frikkieh
///Member
Hell NO, never.
Get your own Midas indicator for about R80-120. It is way more accurate.
The pump jocks can't comprehend why I am checking with my gauge.
I measured my dad's Corolla once and it sat at a wopping 260kPa.
Best to make sure yourself.
Be safe.:thumbs:
Now don't complain about the ingrown toe nails :rollsmile:
Get your own Midas indicator for about R80-120. It is way more accurate.
The pump jocks can't comprehend why I am checking with my gauge.
I measured my dad's Corolla once and it sat at a wopping 260kPa.
Best to make sure yourself.
Be safe.:thumbs:
Coisman said:
Now don't complain about the ingrown toe nails :rollsmile:
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