UncleCreepy
Member
I see what you did thereI had a set of dedicated winter tires. Hakkapeliittas. Unstoppable.
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I see what you did thereI had a set of dedicated winter tires. Hakkapeliittas. Unstoppable.
The softer the suspension, the lower the tire pressure. In that regards the Model 3 is a performance suspension by default, compared to other cars on the road.The 255/45R20 105V, Michelin Primacy Tour A/S is OEM tire on our 2023 Ioniq5 Limited, as well. Wonderful ride, very quiet. Hyundai recommends 34psi on the door jamb, max for tire is 50psi. Even with the relatively low profile 20ā tires, the ride is also smooth and not at all jarring, though Iām not sure how much of that is the suspension.
39/46 psi? You sure that's not the max load/high speed pressures? What kind of bmw is that?The softer the suspension, the lower the tire pressure. In that regards the Model 3 is a performance suspension by default, compared to other cars on the road.
If you were to keep 34psi on the Model 3, the car would be bouncing on the rubber rather than the springs and dampers.
FYI - My BMW sports package has 39/46 PSI recommended on a stagger setup.
It is a ZHP. One of a kind.39/46 psi? You sure that's not the max load/high speed pressures? What kind of bmw is that?
Guess your door sticker only has the high load pressures. In the owner's manual, 2004 330i, for up to 4 passengers, recommended pressures for 18" staggered in your size is 32 psi front 38 psi rear. 5 passengers with luggage is 39/46 as stated in your door sticker.
Typically passenger tires do not publish the load chart of weight vs pressure (but if you called the manufacture they would have it). Also, how many people have actually weighed their car (minus race cars looking for 4 corner weights for balance / suspension). Folks have mentioned above, if you are loading your car to the max and full passengers, increase you pressure to max on tire sidewall. If you are commuting by yourself, you can reduce it down to recommended PSI on door sill that should be optimized for safety, milage, and comfort.
Very interesting analysis. But this example is assuming all the pressure in the tire is due to it touching the ground, right? But if we jack the car up the tire will still probably have nearly the same pressure, well at least not zero psi.I like that you related psi to inches on the ground though. Never thought of it before.Because what you want is basically a certain amount of rubber that is in contact with the street.
The following is dumbed down a bit but for the purpose of your question it's reasonably accurate.
Let's look at a car that weighs 4,000 lbs and has its weight evenly distributed, so each tire is carrying 1,000 lbs. A perfect tire is round, but since it's pushing down on the street, the area that touches the street is flat. The question is: how big is this area? With a pressure of 40 psi (pounds per square inch) it's 1000/40=25 square inches.
The tread width of a Model 3 is 235 mm or about 9.25 inches, so the length of the square footprint would be 25/9.25=2.7 inches.
If you reduce the tire pressure, the amount of rubber touching the street is bigger, causing the tire to flex more, thus causing more rolling resistance.
What car manufacturers do is that they try to find a pressure that is both good for fuel economy and comfort. The max cold pressure of the tire has nothing to do with it and neither does the make of the tire.
It bounces on the tire rubber if I drive at lower pressures. The suspension is just that firm. Tire wear is superbly even. I do not even need to rotate the tires.Guess your door sticker only has the high load pressures. In the owner's manual, 2004 330i, for up to 4 passengers, recommended pressures for 18" staggered in your size is 32 psi front 38 psi rear. 5 passengers with luggage is 39/46 as stated in your door sticker.
I used to have a E46 M3 myself I ran 255/40/18 rear tires at like 38 PSI and the middle of the tires were wearing out quicker than the edges.
Iāve owned a zhp too and still have an e46 m3. The car handles far better at the normal load pressures than the max load pressuresIt bounces on the tire rubber if I drive at lower pressures. The suspension is just that firm. Tire wear is superbly even. I do not even need to rotate the tires.
How's the ride and tire wear at 35psi? i recently switched to 275/40/20 106Y as well and its super bumpy at 38-40 psi. TIAI get it, not sure why your question was not answered but I have been struggling to understand this as well, for instance on the model Y there are 3 different load range tires for just the front axle.
Model Y performance front tire is 255/35/21 load range 98 or 1,653 max load
Model Y with 20" induction wheels are 255/40/20 load range 101 or 1,819 max load
Model Y with 19" gemini wheels are 255/45/19 load range 104 or 1,984 max load
using a tire pressure calculator
and going by the tire mounted on the front of the performance model Y 42 psi on the front tire would equate to 38 psi on the Induction wheel tire and 34 psi on the gemini wheel tire.Tire Pressure Calculator
Easy to use tire pressure calculator. Use our tire pressure calculator to calculate the new tire pressure needed when changing tire sizes.tiresize.com
I just switched tire size from stock to a 275/40/20 with a load range of 106 which would equate to 32 psi, I have been running 35 psi and setting off the tpms tire pressure warning, wish we could reset them to a custom psi like maybe 35 or 36.
Having the tpms warnings too often when running that low so bumped back up to 38psi, ride is much better now though after spending 5k on the redwoods motorsports ohlins gt spec dampers with swift springs, my preferred setting out of 32 clicks is 0 or full softHow's the ride and tire wear at 35psi? i recently switched to 275/40/20 106Y as well and its super bumpy at 38-40 psi. TIA
I'll adjust to 36 and give it a try. LA roads are terrible so maybe thats the real culprit. Thanks for the info .Having the tpms warnings too often when running that low so bumped back up to 38psi, ride is much better now though after spending 5k on the redwoods motorsports ohlins gt spec dampers with swift springs, my preferred setting out of 32 clicks is 0 or full soft
Someone on the internet said it's wrong. There's even a fancy calculator that undoubtedly proves that Tesla has no clue what the right tire pressure is.Whatās the complaint with maintaining 42psi?
To clarify, in case someone gets the wrong idea: the fancy calculator says the tire can be safely lowered to a lower pressure and still maintain the rated load capacity for the vehicle. However, that makes an assumption that the "correct" tire pressure should be the bare minimum for the load capacity, but the reality is there are multiple factors why that would be the "wrong" tire pressure (efficiency, noise, performance, extra margin for overloading, etc).Someone on the internet said it's wrong. There's even a fancy calculator that undoubtedly proves that Tesla has no clue what the right tire pressure is.