18

Yes, you should fill your tire. The fact the other tires all are nominally correct means you should trust your gauge. Modern tires often have reinforced sidewalls that mask the appearance of low pressure. Waiting for a bad wear pattern is not a good plan, as then you'll have an unevenly worn set of tires.


18

Cold. All OEM's door placards specify the tire pressure be set when the tires are "cold". But what is cold? From a random Honda owners manual: Measure the air pressure when tires are cold. This means the vehicle has been parked for at least three hours, or driven less than 1 mile (1.6 km). If necessary, add or release air until the specified pressure is ...


15

Nitrogen is inert and doesn't affect rubber or the steel rim. Carbon dioxide is highly reactive and affects both the rubber by causing swelling in the rubber. It also would cause corrosion in iron based rims (particularly Carbon- Steel). Edit: When CO2 is mixed with moisture becomes Carbolic acid which is corrosive. It all depends on concentration. It is ...


15

The power of an engine is not determined by the difference in pressure between the combustion chamber and the exhaust. Power is determined by how much energy one can put into the combustion chamber and the efficiency of how that energy is applied. When one is compressing the intake air, additional oxygen is being included in the "mix" allowing for ...


14

You should be fine¹ The beauty of fuel-injection management systems is that they can compensate for slight deviations in operation via feedback. The amount of compensation is commonly referred to as "fuel trim" (because the fuel injector pulsewidth is controlled ("trimmed") by the fuel-injection management). It is not uncommon for vehicles to accommodate ...


13

In almost all circumstances you should use the manufacturer's numbers as your guide. They are aware of the requirements of their wheels, and they do understand that a low profile requires a certain pressure to resist damage. This doesn't necessarily need to be a higher pressure (although it sometimes is) because the wheel construction also needs to be ...


13

As long as you are running Light Truck (LT) tires, you should be just fine. Manufacturers take into account the tire pressure is going to go up due to heat buildup. This is why you check tire pressures when they are cold so you don't get a false reading on them. If you lower the pressures to 80psi when hot, you'd actually be causing your tires to overheat ...


12

On every car sold (that I'm aware of) there is a sticker pasted, usually in the door jam of the driver's side, which states exactly what the car manufacturer suggests your tire pressure should be at. It will give a front/back pressure. This is what you should use and not what the pressure on the side of the tire says. The figure on the tire is the maximum ...


12

Nitrogen makes up around 80% of Air - therefore its more readily reclaimed and separated than the smaller amounts of other gases in air. I.e. the process for reclaiming nitrogen from air could be less efficient than that of reclaiming CO2 from air and still be cost effective. Additionally its stability at higher temperatures means its behaves more ...


12

OP's question states: It should follow that turbocharging should be equally effective pumping air out the exhaust, than in the inlet. No, it is not as effective. You can't reduce the pressure to less than 0 psi. So the maximum "suck" you can get is 1 bar. The boost pressure on high performance engines can be 2 to 3 bar. But working from the ...


10

In this article by the NHTSA a formula is given for calculating the speed at which a tire might be expected to hydroplane. The formula assumes "...the water depth exceeds the capability of the tread design to remove water." The formula is:Hydroplaning speed = 10.35 x √ inflation pressure As some examples they give this table:At 30 psi, hydroplaning ...


10

On a car with fuel injection there can be two fuel pumps, one high-pressure and one low-pressure. The low-pressure pump moves the gas from the tank up to the high pressure pump. The high pressure pump then raises the pressure to a level that will be useful to the injectors. The two PIDs reflect those two different systems. PID Description Min ...


9

I will try to answer this as best as possible. There are a few factors that come into play here (Mainly the manufacturer of said engine). Direct injection petrol engines work much like a diesel. You have a low pressure fuel pump that resides in the fuel tank itself, and a super high pressure pump that sits near the fuel rail that delivers fuel to the ...


9

In cylinder pressure is in the 200 psi range. GDI fuel pressure is varied from 500 up to around 3000 psi. This alone is enough to keep fuel blow-back to a minimum. Carefully engineered injector pintle shape also helps. This is no different than port injectors. What is unusual is how the pintle is moved in a GDI injector. In the most successful designs the ...


9

IMO this is not a stupid idea, however it doesn't actually make sense for multiple reasons: A naturally-aspirated Otto or Diesel engine by itself doesn't expand the gas even to atmospheric pressure. When opening the exhaust valve, there's an overpressure escaping – thus wasting energy – before the exhaus stroke itself starts. (This is the concrete reason ...


8

Tire pressure is typically determined by vehicle weight and type of tire. In other words, the 44 psi you refer to is the maximum inflation of the the tire at its maximum load rating. You can safely inflate the tires to the maximum pressure, but it may not give you the best ride or performance. Each vehicle has a specified pressure/load rating on a placard ...


8

Short answer - no. It's perfectly okay. And , it's also perfectly okay to be annoyed. It's one of those things mechanics like to do (no offence to anyone). Similar to endlessly hitting refresh on a windows machine. Your car, as do most modern cars, has a rev-limiter and unless you've crossed that by downshifting, there's no need to be worried. Please ...


8

tl;dr: it depends. Usually bigger wheels + thinner tires = higher pressure. So, should one keep the pressure to what's recommended by the manufacturer regardless of the tire dimensions? Sort of. If the manufacturer has a recommendation for your wheel and tire dimensions, you should definitely start with those. If your new wheels are bigger (and the ...


7

That chart is not universal. You should be fine. Every model will have its own characteristic low-side and high-side pressures. This is why some manufacturers recommend charging refrigerant by mass rather than by high-side, low-side and ambient temperature values. As long as you have charged the system with the correct amount of refrigerant (which you ...


7

Because you have verified the gauge is working reasonably by trying the other tires, go with the gauge. Your owners manual will have the inflation pressures for your car. Just make sure that the recommended pressure in the manual is less than the maximum tire pressure imprinted on the sidewall of the tire. If it is, just fill it to the manuals recommended ...


7

No. Balance is caused by even weight distributed around a tire. If there is more weight in one spot the tire will "wobble" when spun. Inflating a tire more may alter the diameter, but the weight of the tyre itself is still in the same relative place.


6

You might be misinterpreting your tire pressure indicator light. Usually the light comes on when the tire pressure drops below a certain level in at least one tire. I've not heard of one responding to too high a pressure, but I suppose it's possible. I think your pressure indicator light may be indicating a problem with the tire pressure sensor system ...


6

DON'T reduce tire pressure In fact, the recommended thing to do here would be to increase tire pressure if there is more load expected on the vehicle. Have a look at this tire pressure placard for the Nissan Qashqai as an example: Under normal loads, the factory recommendation is that all tires should be inflated at 33 psi Under max load (4-7 passengers, ...


6

Generally speaking any time your tire pressure is more than 10% over or under the ratings I would definitely correct the pressure ASAP and check the tread wear too. In your case 10% is 3 or 4 pounds and you are seeing the tire is low by about 8 pounds (20+%) which is way too much discrepancy. Pump it up and keep a close eye on it for a week or so to be sure ...


6

You could be correct with a bad sensor, or possibly, a corroded connection (vibration making the contact) or a broken wire or a faulty contact in the ignition switch. That's the fun (!!) with electrical faults . tracking them down.


6

There is no direct path from the intake to the exhaust, at least one set of valves will be closed at all times. The exhaust valves open and the piston pushes the exhaust out of the cylinder, then the exhaust valves close and the intake valves open to allow fresh fuel-air mix in. Low pressure on the exhaust may pull the exhaust out a bit quicker but it won't ...


5

Obviously, this can be anything. leak in the new tire even a leak in the rim leak between tire and rim (may be there's some dirt on the rim or a burr on the tire) leak between rim and valve stud leaky valve itself You can do a soapsuds test (dish liquid water mixture) to find the leakage.


5

I maybe know a better way for you. I saw it at some customer tyre and was very impressed. TYRE VALVE CAPS WITH PRESSURE INDICATOR :D They exist for different pressure ranges. So everything you need to do, just go around your car sometimes and look that they are green. If they are yellow or red, you lost some pressure.


5

Something else to be watch out for, if you filled the tire to 44 PSI while the weather is cold and the tire is cold from not being driven, as soon as it warms up, the tire warms up, and so does the air in it. For a temperature change of roughly 10 deg C the pressure will increase about 3 PSI. Which if you have filled up the tire to the max, already puts you ...


5

When you start most vehicles and motorcycles are not an exception to this, all of the display lights are lit indicate that they are all working. If something is not "ON" then it's very possible that the bulb is burned out or a poor connection to the bulb in the panel. Once the vehicle is running all of those lights go to their final state. This is done so ...


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