M35 Tire Pressure
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jcarpent16
- Posts: 23
- Joined: Tue Apr 07, 2009 2:15 am
- Car: 2006 Infiniti M35 Sport
M35 Tire Pressure
Hey everybody. . .so not only am I new to the M, but I am also new to low profile tires. What influences the tire pressure?? The weather?? Agressive driving?? I don't want to over-inflate the tires, but I want them to have enough flexability to where if it drops a psi or 2 it won't trigger the warning sound. Between what psi is the "wheelhouse" for the M? Thanks for the help!!
Re: M35 Tire Pressure (jcarpent16)
Several things influence tire pressure but mainly temperature - for example: whether they are hot or cold and even if they have been sitting facing the sun or in the shade.
If you want to reduce the wide temp variation of air, then try nitrogen filling which alos leak slower than air due to the relatively big nitrogen molecule size.
If you want to reduce the wide temp variation of air, then try nitrogen filling which alos leak slower than air due to the relatively big nitrogen molecule size.
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NightWatch
- Posts: 406
- Joined: Tue Jan 13, 2009 6:43 am
- Car: 2008 M35 Sport - Platinum Graphite
Re: M35 Tire Pressure (jcarpent16)
Tire pressure is always measured "cold" meaning not having driven your car recently and not having had it sit in the sun in a hot parking lot. Follow the tire pressure guidelines printed out on the decal inside your driver's door jam not the ones printed on the sides of the tire - Those are maximum safe tire pressures from the manufacturer, not operating tire pressures for a specific vehicle.
The TPMS alarm doesn't go off until the tire pressure drops 5 psi below the recommended pressure.
The TPMS alarm doesn't go off until the tire pressure drops 5 psi below the recommended pressure.
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szh
- Posts: 15932
- Joined: Tue Jul 23, 2002 12:54 pm
- Car: 2018 Tesla Model 3.
Unfortunately, no longer a Nissan or Infiniti, but continuing here at NICO! - Location: San Jose, CA
(Please also do a search for this topic. There are a number of posts on it. )
Regardless, the general guidelines are:
1. Check every week to two weeks - more often if the weather has changed.2. Low-profile tires show more pressure changes with a given air loss - less total volume to begin with!3. Use a good gauge - whether you use a digital or analog is not that important.4. Check truly "cold" tires ... no driving, and no sun hitting the tire.5. Don't let the pressure drop below the values shown on the door. They are low enough to be uncomfortably close to the load index rating of tires today.6. If you regularly drive high-speeds, increase the cold pressure - sidewall flex and consequent heating is the prime reason for tire failure (the Firestone-Ford SUV debacle!)
My recommendation: start at 36psi and adjust up a few psi (not past the tire max - typically 44 or 51, but that would be a harsh ride) or adjust down a few psi (not below the recommended value shown on the door) till the wear is reasonably even across the tread. Buy an inexpensive tread depth gauge (few bucks) ... the "penny" and newer "quarter" tests are too inaccurate.
BTW, my recommended value of 36psi is a rational compromise between being too high (where the road harshness would be painful for a luxury sports sedan) and being too low (where the safety of our heavy cars would be an issue).
FWIW, on my current Michelin Pilot Sport A/S, I have dropped it to 35psi (and about to go to 34.5 psi), since the wear is higher in the middle than I expected, compared to my older Goodyear Eagle F1 GS-D3 tires ... not sure why, but I think it is because of the sidewall stiffness being different (lower load index too!). I also plan to measure every week once I go to 34.5 psi, since the margin of error (for being low) is increased.
Z
Regardless, the general guidelines are:
1. Check every week to two weeks - more often if the weather has changed.2. Low-profile tires show more pressure changes with a given air loss - less total volume to begin with!3. Use a good gauge - whether you use a digital or analog is not that important.4. Check truly "cold" tires ... no driving, and no sun hitting the tire.5. Don't let the pressure drop below the values shown on the door. They are low enough to be uncomfortably close to the load index rating of tires today.6. If you regularly drive high-speeds, increase the cold pressure - sidewall flex and consequent heating is the prime reason for tire failure (the Firestone-Ford SUV debacle!)
My recommendation: start at 36psi and adjust up a few psi (not past the tire max - typically 44 or 51, but that would be a harsh ride) or adjust down a few psi (not below the recommended value shown on the door) till the wear is reasonably even across the tread. Buy an inexpensive tread depth gauge (few bucks) ... the "penny" and newer "quarter" tests are too inaccurate.
BTW, my recommended value of 36psi is a rational compromise between being too high (where the road harshness would be painful for a luxury sports sedan) and being too low (where the safety of our heavy cars would be an issue).
FWIW, on my current Michelin Pilot Sport A/S, I have dropped it to 35psi (and about to go to 34.5 psi), since the wear is higher in the middle than I expected, compared to my older Goodyear Eagle F1 GS-D3 tires ... not sure why, but I think it is because of the sidewall stiffness being different (lower load index too!). I also plan to measure every week once I go to 34.5 psi, since the margin of error (for being low) is increased.
Z