NX Interesting Discoveries Thread (Good or Bad)
03-01-15, 03:44 PM
#136
The pursuit of F
Thread Starter
Scarecrow2: When I received my Lexus NX 200t the tire pressure reading by the remotes with cold tires were as high as 35 psi on two tires.
I manually (gauge in hand) reset the tires to 32 psi as the Lexus book calls out. The in dash reading said the tires were at 30 psi and one tire triggered the tire alarm. I increased the pressure to 33 psi and car reading was 31psi. Shouldn't this be reading closer than a delta of 2 psi?
It seems to me it should be reading exactly what the tires are at in this day and age.
I had to reset the sensors to clear the false fault and it still didn't help.
I manually (gauge in hand) reset the tires to 32 psi as the Lexus book calls out. The in dash reading said the tires were at 30 psi and one tire triggered the tire alarm. I increased the pressure to 33 psi and car reading was 31psi. Shouldn't this be reading closer than a delta of 2 psi?
It seems to me it should be reading exactly what the tires are at in this day and age.
I had to reset the sensors to clear the false fault and it still didn't help.
However, with that said, I just checked my cold tire pressure and it's at 34 psi whereas the car indicates 32, so likely the car's TPMS is off a little.
I'll keep this in mind. Thanks for pointing this out.
Last edited by corradoMR2; 03-01-15 at 03:49 PM.
03-01-15, 04:04 PM
#137
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03-01-15, 07:33 PM
#138
03-01-15, 07:36 PM
#139
03-02-15, 06:20 AM
#140
Lexus Test Driver
Just keep the cold tire pressure where the door seal says to, thats all.
03-02-15, 09:02 AM
#141
In the manual my tire size shows 32psi and my Info Center shows 37-39psi. I just left my dealer and the Service tech said in our area (FL) they set psi to 37-39 for FL weather and that's where it should be. Down here 32psi would wear out the tires quickly.
03-02-15, 09:29 AM
#142
Lexus Test Driver
32 is determined to be the optimal tire pressure for the car. Going up to 37-39 is not good either.
You will instead wear out the center of the tire tread because now the tire is over inflated.
Come to think of it, that makes even less sense because even direct sunlight can heat a tire and raise the tire pressure. If you're at 37psi, and you park in front of a 90F sun, you can easily get over 40psi just sitting still.
03-02-15, 09:30 AM
#143
Lexus Test Driver
03-02-15, 09:34 AM
#144
That...makes no sense to me.
32 is determined to be the optimal tire pressure for the car. Going up to 37-39 is not good either.
You will instead wear out the center of the tire tread because now the tire is over inflated.
Come to think of it, that makes even less sense because even direct sunlight can heat a tire and raise the tire pressure. If you're at 37psi, and you park in front of a 90F sun, you can easily get over 40psi just sitting still.
32 is determined to be the optimal tire pressure for the car. Going up to 37-39 is not good either.
You will instead wear out the center of the tire tread because now the tire is over inflated.
Come to think of it, that makes even less sense because even direct sunlight can heat a tire and raise the tire pressure. If you're at 37psi, and you park in front of a 90F sun, you can easily get over 40psi just sitting still.
He said it in front of my sales guy too..
03-02-15, 10:04 AM
#145
Lexus Test Driver
I'm not going to stand up on a soapbox and say what you should do, but I would really rethink that air pressure.
03-02-15, 03:13 PM
#146
The pursuit of F
Thread Starter
Agree with @swacer that the static tire pressure of 37-39 psi is too high especially in hotter climates. Tires can wear a little more in the center. On long highway rides in extremely hot weather, the risk of a tire blowout is increased. I'm at 33-34 psi (actual) just 1-2 psi above manufacturer recommended as I find it's the best compromise to ride comfort, handling, fuel economy, and tire wear.
NOTE: I made an error in my previous post regarding the tire pressure readings. 34 psi was inside my garage (50 deg F) while the TPMS readout was 32 psi about an hour prior when I had driven for a quick errand and parked it outdoors (10 deg F).
In short, my NX's TPMS reading versus my digital tire gauge are both the same with nominal difference of maybe 0.5 psi at most.
NOTE: I made an error in my previous post regarding the tire pressure readings. 34 psi was inside my garage (50 deg F) while the TPMS readout was 32 psi about an hour prior when I had driven for a quick errand and parked it outdoors (10 deg F).
In short, my NX's TPMS reading versus my digital tire gauge are both the same with nominal difference of maybe 0.5 psi at most.
Last edited by corradoMR2; 03-02-15 at 03:17 PM.
03-02-15, 05:21 PM
#147
The main thing is to check your tire pressure at least once a month as seasons change.
03-03-15, 04:34 AM
#148
Reading these comments has me worried. If corrado agrees with swacer than I have to take note. The sticker on the NX says 32psi cold. The tire sidewall says max pressure 51 psi.
I'm going to lower my pressures until I find out more from Lexus.
I'm wondering if they are inflated that high just to get better mpg's?
03-03-15, 04:59 AM
#149
Lexus Test Driver
Glen, my NX was delivered to me with 39 psi also here in Florida. While inspecting my NX before taking it home I noticed the tire pressures on the TPMS and commented to my salesman that 39 was high but he said it was OK.
Reading these comments has me worried. If corrado agrees with swacer than I have to take note. The sticker on the NX says 32psi cold. The tire sidewall says max pressure 51 psi.
I'm going to lower my pressures until I find out more from Lexus.
I'm wondering if they are inflated that high just to get better mpg's?
Reading these comments has me worried. If corrado agrees with swacer than I have to take note. The sticker on the NX says 32psi cold. The tire sidewall says max pressure 51 psi.
I'm going to lower my pressures until I find out more from Lexus.
I'm wondering if they are inflated that high just to get better mpg's?
Furthermore, with the heavy rain you guys get in Florida during hurricane season, keep in mind that by over inflating, you are rendering the side tread on your tire useless because its never really contacting the ground.
Always trust whats inside the door when utilizing the factory wheels. If you change wheels, then you can look into another pressure that works best for that wheel and the tire combination.