LS 460 Tire Pressure Question
#16
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Lexus told me that this has less to do with tire wear (personally, I find OEM tires to be garbage anyway) and more to do with the fact that when cold weather sits, people were bringing their LS's in because the tpms light was on. They recommended raising the pressure to compensate.
The ride difference is very noticeable to me when it's at 38. I keep mine at 33-34.
The ride difference is very noticeable to me when it's at 38. I keep mine at 33-34.
but it's surprising to see the difference. pressure in my tires were ok here in socal one winter, we drove to norcal, and next morning all pressures said low...
Hey guys,
Sorry in advance, but I am probably the least mechanically inclined person you'll encounter on here. My two week old '10 LS460 AWD indicates the tire pressure to be anywhere between 38 to 41, depending on whether the tires are cold or not. Should I adjust this down to 35 or 36 since I do a combination of driving on bumpy city (Chicago) roads and the interstate and want a balance between really soft ride and long treadlife? To make this adjustment, do I literally let air out of the tires until the TMPS indicates the pressure numbers I want? Which of the 5 numbers is the spare? I guess I'll figure it out by seeing which numbers change.
P.S. - jmcraney, since I saw you posting on this thread, just a quick comment that at 80 mph I have not experienced any unusual wind noise. There were some strong cross winds yesterday that were causing a little wind turbulence, but today the winds were calm and there was no noise. Pheew. Crossing my fingers!
Allen
Sorry in advance, but I am probably the least mechanically inclined person you'll encounter on here. My two week old '10 LS460 AWD indicates the tire pressure to be anywhere between 38 to 41, depending on whether the tires are cold or not. Should I adjust this down to 35 or 36 since I do a combination of driving on bumpy city (Chicago) roads and the interstate and want a balance between really soft ride and long treadlife? To make this adjustment, do I literally let air out of the tires until the TMPS indicates the pressure numbers I want? Which of the 5 numbers is the spare? I guess I'll figure it out by seeing which numbers change.
P.S. - jmcraney, since I saw you posting on this thread, just a quick comment that at 80 mph I have not experienced any unusual wind noise. There were some strong cross winds yesterday that were causing a little wind turbulence, but today the winds were calm and there was no noise. Pheew. Crossing my fingers!
Allen
#17
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As far back as I can remember (maybe the early 1960's) the car manufacturers and the tire manufacturers have always battled over recommended tire pressures. The car manufacturers want it lower so the ride is better, and the tire manufacturers want it higher so the wear is better.
As long as you inflate your tires so that they are no higher than the tire manufacturer max pressure when hot, then you are fine. You will get the best tire wear and handling characteristics. If you have to err, higher inflation is preferable to under inflation.
As long as you inflate your tires so that they are no higher than the tire manufacturer max pressure when hot, then you are fine. You will get the best tire wear and handling characteristics. If you have to err, higher inflation is preferable to under inflation.
#18
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Speaking of tire pressures - does anyone know if the pressures on the display give any kind of indication as to what wheel position they correspond to, on the 2010 models?
#19
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If I recall (and it's been a while, I could be wrong) -- there is a hard limit built into the computer, nobody, not even the dealer, can reset the reference point below that limit, hence why so many cars were coming in when the weather got cold - I believe the hard limit isn't too terribly far off from 33psi. Lexus found it easier to just tell the dealers to (over)inflate the tires.
Speaking of tire pressures - does anyone know if the pressures on the display give any kind of indication as to what wheel position they correspond to, on the 2010 models?
Speaking of tire pressures - does anyone know if the pressures on the display give any kind of indication as to what wheel position they correspond to, on the 2010 models?
i would be interested in knowing if they improved the system on 2010, though i stay a but skeptical for now
#20
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Bottom hard limit is 30. Any tire pressure of 29 or lower turns on the warning light which can Not be cleared by resetting. IIRC, even driving over an hour with the tire pressure rising above 30 would not make the warning light turn off.
#21
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In your case, we don't know at what pressure it was benchmarked so we don't know how high the pressure would need to be to turn off the warning. On my car for example, when a tire is benchmarked at 40 PSI the alarm is generated when the display changes from 32 to 31.
That is a pretty wide margin and should accommodate most temperature and permeation variations if the tires are tended to every two months.
I think most of the dealers were not well informed about how all this works - perhaps a Japanese to English translation issue - and their solution was to add more air. I operate mine at 33 PSI (cold) and never have a problem.
#23
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I inflate the spare to 39 PSI. That way I can at least tell which one is the spare on the readout. Also, it insures I'll have plenty of air in it should I have to put it on the ground.
#24
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>>In your case, we don't know at what pressure it was benchmarked so we don't know how high the pressure would need to be to turn off the warning.
The dealer brings it home around 36-38, I lower to 33 and do a reset. Same nonsense every 5k miles![Sad](https://www.clublexus.com/forums/images/smilies/sad.gif)
>The reset is not intended to be used to cancel alarms
When you are out in west Texas a couple hours from air - those multiple blazing yellow warning lights are just annoying.
The dealer brings it home around 36-38, I lower to 33 and do a reset. Same nonsense every 5k miles
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>The reset is not intended to be used to cancel alarms
When you are out in west Texas a couple hours from air - those multiple blazing yellow warning lights are just annoying.
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
#25
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If I recall (and it's been a while, I could be wrong) -- there is a hard limit built into the computer, nobody, not even the dealer, can reset the reference point below that limit, hence why so many cars were coming in when the weather got cold - I believe the hard limit isn't too terribly far off from 33psi. Lexus found it easier to just tell the dealers to (over)inflate the tires.
Speaking of tire pressures - does anyone know if the pressures on the display give any kind of indication as to what wheel position they correspond to, on the 2010 models?
Speaking of tire pressures - does anyone know if the pressures on the display give any kind of indication as to what wheel position they correspond to, on the 2010 models?
#26
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I checked with my SA when I got my car and they said that there was no way to know which wheel position the pressures correspond to - other than the spare which is inflated to a much higher pressure. Totally different from the 550i I had which showed a schematic of the car and each tire and changed the tire color from green (good pressure) to red (low pressure) so you could easily see which tire was causing the alarm.
#27
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I have a 2010, and I can confirm there is indeed not an indication of which reading corresponds with which tire. The manual confirms this. I have, however, figured out that the top reading must be the spare tire, because it rarely changes during driving, while all the others increase to 39 or 40.
#28
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I have a 2010, and I can confirm there is indeed not an indication of which reading corresponds with which tire. The manual confirms this. I have, however, figured out that the top reading must be the spare tire, because it rarely changes during driving, while all the others increase to 39 or 40.
#29
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I have a 2010, and I can confirm there is indeed not an indication of which reading corresponds with which tire. The manual confirms this. I have, however, figured out that the top reading must be the spare tire, because it rarely changes during driving, while all the others increase to 39 or 40.
The order they appear is the order the sensor IDs were entered when the sensor serial numbers were programmed in.
#30
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Here's a good question.
I have acquired second set of Lexus rims with tires cheap off Ebay. They came right off LS460 2010. I intend to use them as soon as they are delivered.
My question is upon installing the new set of rims with tires. Would my 07 LS460 bark with yellow lights because the computer might not recognize the other TPMS devices?
I have acquired second set of Lexus rims with tires cheap off Ebay. They came right off LS460 2010. I intend to use them as soon as they are delivered.
My question is upon installing the new set of rims with tires. Would my 07 LS460 bark with yellow lights because the computer might not recognize the other TPMS devices?
![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)