correct tire pressure

[sniff275]

Just put a new set of Yokahama AVID W4s tires on a '06 m45 touring.

the dealer has pumped to 44psi and the sidewall say max says max 52psi.

I have never had my tires over 32psi, but also never had wrated tires.

not sure if they are over, under, or correct pressure.

can you anyone offer some advise. much appreciated

thanks

[07sportm35]

Just put a new set of Yokahama AVID W4s tires on a '06 m45 touring.

the dealer has pumped to 44psi and the sidewall say max says max 52psi.

I have never had my tires over 32psi, but also never had wrated tires.

not sure if they are over, under, or correct pressure.

can you anyone offer some advise. much appreciated

thanks

44PSI is too high. Infiniti recommends 33PSI. Most people run about 36PSI.

I would start at 36PSI and see if your ride comfort is acceptable. Much more than that and your tires will wear down mainly in the middle. For even tire wear somewhere between 32-38PSI.

For maximum handling and steering response go higher. For maximum comfort go lower.

Taste great, less filling...

[NightWatch]

Follow the recommended tire pressure stated on the sticker inside the driver's side door jamb. The pressure stated on the sidewall of the tire is the Max pressure that the tire can handle safely. The tire pressure stated on the door jamb is per the suspension and geometry of the vehicle and should be followed with any tire that meets the manufacturers specifications.

[M45Caliber]

Good advice -- I run mine at 2 PSI OVER the door decal pressure and I get even wear and an acceptable ride... basically running at about 35 PSI. The manager at Discount Tire (who's been at my location for over a decade) recommended this and he's been spot on. BUT -- 44 is WAY to high. The #1 cause of gauge innacuracy is that the gauge they use has been dropped a few times and becomes grossly inaccurate. It's possible that his gauge read 36 PSI but actual is 44 -- or maybe YOUR gauge is inaccurate?

I use a high end rubber coated dial gauge with a short neck. I also have an electronic/digital one that I use to confirm the accuracy of the dial.

Just be sure YOUR gauge is accurate before you change the pressure.

[M45Caliber]

Oh, and you will LOVE the Yoko's -- that's the SAME exact tire I've had on my M45 for over 17,000 miles so far, and they are wearing great. Amazing wet and dry handling and very quiet too - you will be amazed at how well these perform for you. Enjoy!

[sniff275]

thanks everyone. appreciate the advice and will check it all out.

the car gauge actually said 44. I will check with my hand held one.

[szh]

Please also read these threads for more info:

zerothread/106204http://forums.nicoclub ... ead/368253

In the last one above, I posted some links to excellent gauges (including one I'd like to have, but is way too expensive!)

I have this one: http://www.amazon.com/Accutire...r=8-3 (the Accutire MS 5510B Racing Tire Gauge).



It is not perfect ... the mechanism for re-reading is not convenient at all. If you use the side-valve to bleed a little air, it does not re-read, till you take the damn thing off and release pressure and push in again. However, I have gotten used to this little anomaly and love the accuracy of the gauge.

Z

[antzrus]

Please also read these threads for more info:

zerothread/106204http://forums.nicoclub ... ead/368253

In the last one above, I posted some links to excellent gauges (including one I'd like to have, but is way too expensive!)

I have this one: http://www.amazon.com/Accutire...r=8-3 (the Accutire MS 5510B Racing Tire Gauge).



It is not perfect ... the mechanism for re-reading is not convenient at all. If you use the side-valve to bleed a little air, it does not re-read, till you take the damn thing off and release pressure and push in again. However, I have gotten used to this little anomaly and love the accuracy of the gauge.

Z

Just to play devil's advocate; it is fancy looking but how do you know it's so accurate? Do you have another "certified" accurate gauge to compare it to?

[szh]

An excellent question!

No, I have not compared this to a certified gauge or pressure source for absolute reading accuracy - that is within 0.5 psi as I recall from the manuals and specs. For absolute accuracy, I'd love to get this one: http://performancetuner.net/DTPG.html - it has 0.03 psi guaranteed absolute accuracy and resolution to 0.01 psi, but this is major league overkill!

However, from a relative readings perspective, with the Accutire gauge, I can set my tires to within 0.1 to 0.2 psi psi of each other, since the readings are totally repeatable from one to the next reading - the slight drop each read is due to the very minute release of air each time I press the valve in.

And that is what I was looking for with this gauge! I set my tires to a 36 psi reading and adjust up or down based on tread wear (which a cheap depth gauge can easily measure - the penny or quarter test is not sufficiently accurate really).

Plus, I can watch my tire pressure drop over time (as is very normal) and they tend to stay within 0.2 to 0.3 psi of each other as they lose pressure. If they differ by more than that over a 2 to 3 week period (as happened to my wife's tires a few weeks ago), I know that some tire is leaking more than normal.

In my wife's car case, it turned out to be a small screw that had embedded into the tire! After repair, I am back to the same relative change weekly.

By the way, with ultra low profile tires, like the 30, 35 and 40 ratio tires (and the 45 ratio I prefer to use for more sidewall and comfort) people are doing here, it is vital to check the pressure often - ideally ever week to two weeks.

Because there is less air in the tire overall compared to a high sidewall tire, it does not take much air loss (normal over time) or temperature changes for the tire pressure to change by more than you might expect.

Z

[infinitiandbeyond]

GO HERE, to OG Racing. 20 years of supplying racing safety equipment including some of the best tire monitoring equipment.

http://www.ogracing.com/catalo...nance

[szh]

Longacre definitely makes good analog gauges! The fluid-filled ones will be the most temperature insensitive.

Z