With my partner today we stopped at a gas station to pump up the tires on his 2015 Ford Mondeo Ambient as he thought they were a bit low. When he was pumping it up I noticed he set it to 49 (50
is the max as it says on the tires) which I thought odd since I’ve usually only seen people go from like 32-42. I don’t know a lot about cars so we’re in disagreement over whether this is correct to do or not. So looking for pros cons and explanation as to why it usually ~35 you tend to see tired pumped to.
Uživatel #556352 10172 příspěvků
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zveřejněno 2022. března 12, 1:03 AEST
zveřejněno 2022. března 12, 1:03 AEST
Higher tyre pressure is for more weight. Say you are moving house, and pack everything including the kitchen sink into your car, That is when you should pump your PSI up to the maximum on your tyres.
28-38 is pretty average, but every tyre is different, and they are different on every model car.
Uživatel #214245 13663 příspěvků
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zveřejněno 2022. března 12, 1:04 AEST
zveřejněno 2022. března 12, 1:04 AEST
50 is way too high.
— Reduced ride quality
— Increased noise
— Tyre wear primarily in the centre of the tread
— Reduced grip
Uživatel #305475 5597 příspěvků
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zveřejněno 2022. března 12, 1:30 AEST
zveřejněno 2022. března 12, 1:30 AEST
50 way too high. For a passenger car around the suburbs or on sealed roads 35-38 is ideal IMHO. By the way, where did you find this ’Gas station’ and ‘tires’ in Australia. FFS let’s try to keep the Americanisms at bay.
Uživatel #99500 4127 příspěvků
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zveřejněno 2022. března 12, 1:45 AEST
zveřejněno 2022. března 12, 1:45 AEST
For a regular passenger car with road tyres 32-35 is the norm. 50 will be be harder and harsher for vibrations and bumps and also could risk uneven wear.
Uživatel #47412 3628 příspěvků
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zveřejněno 2022. března 12, 1:49 AEST
zveřejněno 2022. března 12, 1:49 AEST
The space saver in the boot is normally at higher psi – around 50.
Partner could be a lazy as$; pump it real high once in a blue moon?
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zveřejněno 2022. března 12, 1:57 AEST
zveřejněno 2022. března 12, 1:57 AEST
35-38 is ideal IMHO. By the way, where did you find this ’Gas station’ and ‘tires’ in Australia. FFS let’s try to keep the Americanisms at bay.
Lol, you should read that again.
Uživatel #207758 7868 příspěvků
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zveřejněno 2022. března 12, 2:42 AEST
zveřejněno 2022. března 12, 2:42 AEST
Now I want to know what «a bit low» would be, if the norm is 49
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zveřejněno 2022. března 12, 3:25 AEST
zveřejněno 2022. března 12, 3:25 AEST
to pump up the tires on his 2015 Ford Mondeo Ambient as he thought they were a bit low
Checkout the recommended pressure.
Usually there are labels either inside the fuel filling area or perhaps around door frames of that car. Otherwise Owners Manual will.
Max or min of the actual rubber doesn’t mean it’s appropriate for every vehicle.
Uživatel #221604 12401 příspěvků
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zveřejněno 2022. března 12, 3:27 AEST
zveřejněno 2022. března 12, 3:27 AEST
Way too high. I run 38/40 on my Ute which has weight in the tub
32-36 for passenger cars
Uživatel #669634 10415 příspěvků
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zveřejněno 2022. března 12, 3:52 AEST
zveřejněno 2022. března 12, 3:52 AEST
As already said. WAY too high.
Uživatel #73572 16848 příspěvků
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zveřejněno 2022. března 12, 4:21 AEST
zveřejněno 2022. března 12, 4:21 AEST
When he was pumping it up I noticed he set it to 49 (50
is the max as it says on the tires)
Bit of a worry as 50psi is the max, what is going to happen when the tyre filled to 49 heats up a bit on the road, it will be well over 50psi when warm.
The max pressure is what is required to support the tyres maximum rated weight.
If you have a 98 load rating on your tyres, that is 750kg per tyre, unless you are driving a 3T car, then you don’t need the tyres set to max pressure on the sidewall.
There will be a placard on the car, usually in the driver door sill, which will give the recommended cold pressures, you can usually go a few psi above this if you want to improve handling a the the cost of comfort. Personally I use 40psi as a maximum and just work our what pressure I like.
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zveřejněno 2022. března 12, 6:18 AEST
upraveno 2022. března 13, 5:36 AEST
posted 2022-Mar-12, 6:18 pm AEST (edited 2022-Mar-13, 5:36 am AEST)
we stopped at a gas station
Were you in America?
When he was pumping it up I noticed he set it to 49 (50
Way to high for a passenger car. As others have said tyre placard should give yo an idea.
Uživatel #149787 1871 příspěvků
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zveřejněno 2022. března 12, 8:27 AEST
zveřejněno 2022. března 12, 8:27 AEST
Just go let the air back out to the recommend PSI.
Uživatel #73572 16848 příspěvků
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zveřejněno 2022. března 13, 8:56 AEST
zveřejněno 2022. března 13, 8:56 AEST
Lol, you should read that again.
:). As much as I detest the use of Americanisms, there is some irony in the fact we are talking about POUNDS per square INCH and measuring wheel rims in inches..
Uživatel #569843 11156 příspěvků
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zveřejněno 2022. března 13, 10:12 AEST
upraveno 2022. března 13, 10:16 AEST
zveřejněno 2022. března 13, 10:12 AEST (upraveno 2022. března 13, 10:16 AEST)
Bit of a worry as 50psi is the max, what is going to happen when the tyre filled to 49 heats up a bit on the road, it will be well over 50psi when warm.
Nothing, because the max tyre pressure is when it is cold and this caters for addition pressure when hot.
Just go let the air back out to the recommend PSI.
The manufacture recomendation is a compromise between ride comfort, wear, and fuel economy. There is no safety issue to the tyre when running it at max PSI. The car, if unloaded, will lose grip in the wet when at max PSI.
I personally run all my cars at 40 PSI. If i was just doing highway runs in the dry, i would be happy to run at 50 PSI.
I run my caravan at 60 PSI, 5 PSI below the tyres max.
Uživatel #47412 3628 příspěvků
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zveřejněno 2022. března 13, 10:22 AEST
zveřejněno 2022. března 13, 10:22 AEST
i would be happy to run at 50 PSI
Smaller contact patch with the road. That is not a good thing.
Uživatel #340130 2575 příspěvků
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zveřejněno 2022. března 13, 10:32 AEST
zveřejněno 2022. března 13, 10:32 AEST
50psi is what you’d do if you were guaranteed a smooth road and were desperately trying to save money on fuel consumption. You will get better economy at high pressures because rolling resistance is reduced. When I was driving a VT Holden regularly from Melbourne to Sydney I would pump up to 40psi for the highway then lower to 32psi as soon as I got to the city.
But then again, you will be more likely to suffer a puncture because the tyre is less flexible so that would eat up all your fuel savings.
If the road is going to be rough or potholed then high tyre pressures means that all of the impacts are transferred to the suspension system making that work much harder. And of course you have less traction as other posters have indicated.
So look for the tyre placard on the inside of a door frame and use it.
Uživatel #802363 322 příspěvků
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zveřejněno 2022. března 13, 10:34 AEST
zveřejněno 2022. března 13, 10:34 AEST
Are the pressures on door label meant to be cold or hot pressures?
Uživatel #47412 3628 příspěvků
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zveřejněno 2022. března 13, 10:53 AEST
zveřejněno 2022. března 13, 10:53 AEST
cold or hot pressures?
The manufacture recommendation is a kompromis balance between ride comfort, wear, and fuel economy
Fixed that for you.
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zveřejněno 2022. března 13, 10:56 AEST
zveřejněno 2022. března 13, 10:56 AEST
Always wondered because most people would check tyre pressure at service station, so there tyres would be hot from the drive
Uživatel #47412 3628 příspěvků
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zveřejněno 2022. března 13, 10:59 AEST
zveřejněno 2022. března 13, 10:59 AEST
check tyre pressure at service station, so there tyres would be hot from the drive
a. keep a gauge at home
b. short drive to nearest servo – not enough to heat up the tyres much
Uživatel #802363 322 příspěvků
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zveřejněno 2022. března 13, 11:14 AEST
zveřejněno 2022. března 13, 11:14 AEST
Yea I’m not saying me personally, I have guage in car, compressor at home etc, just thinking about the general public
Uživatel #202456 20867 příspěvků
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zveřejněno 2022. března 13, 11:41 AEST
zveřejněno 2022. března 13, 11:41 AEST
measuring wheel rims in inches..
but, we measure tire width with millimeters and diamater in inches
Uživatel #109894 19799 příspěvků
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zveřejněno 2022. března 13, 12:01 AEST
zveřejněno 2022. března 13, 12:01 AEST
Always wondered because most people would check tyre pressure at service station, so there tyres would be hot from the drive
Just set the inflator a couple psi higher to account for it, for 98% of people a couple psi either way for daily driving is completely unnoticeable.
Uživatel #802363 322 příspěvků
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zveřejněno 2022. března 13, 12:35 AEST
zveřejněno 2022. března 13, 12:35 AEST
Totally. The one vehicle I have noticed and played around with pressures a lot is my PX ranger I have had since new, a few psi either way is noticeable with the stiff/bumpy unladen ride
Uživatel #877218 373 příspěvků
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zveřejněno 2022. března 13, 1:21 AEST
zveřejněno 2022. března 13, 1:21 AEST
To give everyone at update.
Suprised at the amount of people irritated about me saying gas instead of petrol station/service station (not gonna say servo I’m not from north Qld. )
Drove around yesterday and while it was fine for most of the way (highway/freeway driving and mount Waverly) where I live (Elwood) roads are shit and we instantly noticed when we got to Caufield that the generally much more comfortable no bumps felt ride started feeling well bumpy. It’s now back at 35.
Uživatel #556352 10172 příspěvků
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zveřejněno 2022. března 13, 1:43 AEST
zveřejněno 2022. března 13, 1:43 AEST
It’s now back at 35.
Sensible choice. There are placards on almost all cars with indicators to recommend PSI too. (as mentioned elsewhere in the thread).
These placards are in your door, usually.
Uživatel #569843 11156 příspěvků
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zveřejněno 2022. března 13, 2:14 AEST
zveřejněno 2022. března 13, 2:14 AEST
Always wondered because most people would check tyre pressure at service station, so there tyres would be hot from the drive
City driving won’t get your tyre hot, warm at best.
Drive on the freeway for 3 hours with 4 people and a fullboot on a 35+ degree day, that will get your tyres hot, like hot water when you touch the tread.
Uživatel #802363 322 příspěvků
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zveřejněno 2022. března 13, 2:28 AEST
zveřejněno 2022. března 13, 2:28 AEST
City driving won’t get your tyre hot
Driving down the road around town will increase it a couple of psi
Uživatel #73572 16848 příspěvků
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zveřejněno 2022. března 13, 3:12 AEST
zveřejněno 2022. března 13, 3:12 AEST
City driving won’t get your tyre hot, warm at best.
My tyre pressure increases from 39psi cold to 43 from just city driving, highway driving doesn’t climb much above that.
Uživatel #73572 16848 příspěvků
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zveřejněno 2022. března 13, 3:18 AEST
zveřejněno 2022. března 13, 3:18 AEST
Suprised at the amount of people irritated about me saying gas instead of petrol station/service station
really? ‘gas station’ is 100% an American term, I don’t know anyone who lives in Australia who calls it a gas station, unless they are only very recently arrived, or are just trying to piss people off..
Even the term ‘hood’, or ‘windshield’ is more accepted here, and that will get you a big enough response.
If you don’t like petrol station, just call if a fuel station, not too many people will react to that.
(not gonna say servo I’m not from north Qld. )
Uživatel #73572 16848 příspěvků
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zveřejněno 2022. března 13, 3:19 AEST
zveřejněno 2022. března 13, 3:19 AEST
but, we measure tire width with millimeters and diamater in inches
ha ha. .yeah, and the sidewall height as a percentage. It is a weird system.
Uživatel #802363 322 příspěvků
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zveřejněno 2022. března 13, 3:46 AEST
zveřejněno 2022. března 13, 3:46 AEST
gas station’ is 100% an American term
I’m really surprised this got the reaction too, here in NZ plenty of people call it a gas station, or Go and get gas. Hell even one of the service stations is branded with the name G.A.S. Way more so than people saying Hood or windshield.
Uživatel #776650 2228 příspěvků
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zveřejněno 2022. března 13, 3:54 AEST
zveřejněno 2022. března 13, 3:54 AEST
I say servo and I have never been to Northern QLD.
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zveřejněno 2022. března 13, 4:11 AEST
zveřejněno 2022. března 13, 4:11 AEST
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zveřejněno 2022. března 13, 4:13 AEST
zveřejněno 2022. března 13, 4:13 AEST
43 PSI for our EVs. We also get free fuel, forever (solar) at home. Never have to visit disgusting petrol/gas/servo stations.
Uživatel #672540 7073 příspěvků
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zveřejněno 2022. března 13, 4:30 AEST
zveřejněno 2022. března 13, 4:30 AEST
I run 40 all round on each of my 3 cars. Seems a good compromise between sharp steering and good fuel economy with an acceptable ride.
Uživatel #591560 3444 příspěvků
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zveřejněno 2022. března 13, 6:04 AEST
zveřejněno 2022. března 13, 6:04 AEST
Suprised at the amount of people irritated about me saying gas instead of petrol station/service station
It’s a constant battle I have with my kids. Hate americanisms sneaking in
Uživatel #350474 3520 příspěvků
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zveřejněno 2022. března 13, 6:17 AEST
zveřejněno 2022. března 13, 6:17 AEST
38 PSI is the most I put in our cars and that’s on the firmer side IMHO
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zveřejněno 2022. března 13, 7:06 AEST
zveřejněno 2022. března 13, 7:06 AEST
Driving down the road around town will increase it a couple of psi
Driving 1km to the local servo (I’m not a QLD’er) my tyres may go up 2 psi.
When the morning sun hits one of my cars, tyres on the sun side may be 1 to 3 psi higher than the cold side.
If I’ve driven to the servo or 2 tyres are reading higher (from sun), I’ll add 5psi over my desired cold temp so I can let air out to desired PSI that night when they are all cold.
One car with nitrogen in tyres gets checked at least once a year by my local workshop. I won’t do it, I reckon I have an 80% chance of letting some nitrogen escape while using the gauge.
30+ years ago some taxi drivers I knew (born and bred locals) would say similar to «I’m going to get plyn» referring to LPG.
From memory.
I put 50 psi in a wheel chair when I check occasionally. I used to put 50 to 55 psi in my trailer’s jockey wheel. On a track my tyres were around 45 psi hot (and chew them up). I can’t imagine why anyone would run 50 psi on a family car.
Odeslat Scampo77 » Čt 05. července 2018 11:21
I have vacuumed this system out, I put the recommended amount of 134a in the system which is 450 grams. The system was working before I repaired a hole in the condenser, now I can’t get below 75 degrees measured temperature on the cold pipe with 50 psi on the low side. I have approx 230psi on a 90 degree day.
Hitting the condenser with a garden hose drops the high pressure but leaves the low side unchanged.
I have good air flow on the evaporator, and when I read the engine I get the low side to dip down to about 25psi but the pipe temp doesn’t change.
2006 smart fortwo
0.8l diesel
Kanada
Any advice would greatly help me out.
JohnHere Preferovaný člen Příspěvky: 1173 Založen: Ne 13. května 2018 10:20 pronájem: Jižní Karolína Upstate — USA
Re: 50 psi on the low side
Odeslat JohnHere » Po 09. července 2018 10:34
You have 230 PSI on the high side on a 90-degree day, which sounds about right. I’m confused about the ‘cold pipe» and low-side pressures of 25 and 50 PSI. I don’t think you mentioned what the vent temp is, but I assume it is higher than you’d like. Did you replace the condenser with a new one or just repair the hole? What do you mean by «read the engine?» Is this a CCOT or TXV system?
Člen – MACS (Mobile Air Climate Systems Association)
Děkujeme za odpovědi, které jste obdrželi? Zvažte prosím poskytnutí peněžního daru fóru.
Scampo77 Příspěvky: 2 Založen: Čt 05. července 2018 11:14
Re: 50 psi on the low side
Odeslat Scampo77 » Po 09. července 2018 10:51
Sorry. Not «read» the engine. It should have said «when I rev up the engine» auto correct turned rev into read.
I don’t know what a CCOT or a TVX system is.
I welded the hole closed in the condenser to get it working until the new condenser gets here from Europe.
The vent temperature is sitting around 80F
In other vehicles I have fixed I have got about measued 35F on the pipe with about 8 degrees of super heat. This little car isn’t even close
I pulled the heater box apart and found the evaporator is clean and clear and the cabin filter I pulled out for now until I fix this problem.
JohnHere Preferovaný člen Příspěvky: 1173 Založen: Ne 13. května 2018 10:20 pronájem: Jižní Karolína Upstate — USA
Re: 50 psi on the low side
Odeslat JohnHere » Po 09. července 2018 12:34
Scampo77 wrote: Sorry. Not «read» the engine. It should have said «when I rev up the engine» auto correct turned rev into read.
Got it. Happens to me as well
Scampo77 wrote: I don’t know what a CCOT or a TVX system is.
Clutch Cycling Orifice Tube, or Thermostatic Expansion Valve
Scampo77 wrote: I welded the hole closed in the condenser to get it working until the new condenser gets here from Europe.
That might be part of the problem, especially if any debris found its way in and/or if the repaired area is still leaking a little.
Smart cars like your year and model are known to have persistent refrigerant leaks. Are you sure that you still have 450 grams (15.9 ounces) in it? Because this system holds so little refrigerant, just a couple of ounces lost will result in performance issues. Maybe the hole repair is still leaking, or it could be losing refrigerant someplace else that you haven’t noticed yet. Revving the engine and seeing the low pressure drop like that could mean a metering device issue (CCOT or TXV, whichever it has).
One other thing: I strongly advise against using Red Tek or DuraCool in it and staying with plain old R-134a. I believe that these products, readily available in Canada, are essentially propane (highly flammable!), and might also contain sealer. You definitely don’t want any sealer in your A/C system.
In the USA, we don’t normally evaluate a mobile A/C system using superheat and subcooling. We generally leave those methods to the residential/commercial HVAC techs. Charging by weight using the proper refrigerant and an accurate scale, measuring / evaluating high and low pressures, and gauging vent temps is essentially the way we do it here. So I’m a bit out of my league with the former.
At this point, I think I’d wait until the new condenser arrives. Then, recover whatever refrigerant is in there, install the new condenser, along with a new receiver/dryer and all o-rings, evacuate well, recharge to spec with plain R-134a, an ounce of the appropriate oil, and a little UV dye. With the dye pre-installed, you can then leak-check the system later if you discover that it’s still losing refrigerant.
Člen – MACS (Mobile Air Climate Systems Association)
Děkujeme za odpovědi, které jste obdrželi? Zvažte prosím poskytnutí peněžního daru fóru.
