Michelin Pilot Sport 4S Tire Pressure

[Paul's stable]

If they are wearing evenly and driving well and getting good traction . . . wait. It is December, and you are in Canada . . .

It is sitting in his heated garage for now waiting for spring.

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[COBill]

Well it seems I miss read my door jamb and it say 33 psi not 30 dam I needed to put on my reading glasses. Mine have been set at 30 cold then it would rise to 34-35 when hot. Tires are wearing nice though. Just what I do I'm just an old man so don't pay much attention to me.

I wouldn't worry about it too much; most tire pressure gauges aren't accurate enough to tell you whether you're really ±3 PSI.

 

[Junkyard Dog]

I wouldn't worry about it too much; most tire pressure gauges aren't accurate enough to tell you whether you're really ±3 PSI.

Are you saying that there is a 6 psi swing in tire pressure? If so, wouldn't I notice that when I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this. In fact, I can drop fractions of a psi and see it on the gauge.

That is question 1.

What about the dash display? Upor down 3 psi, so 6 total? My dash seems pretty steady, increasing as I drive and get heat, dropping as they cool off. On a really cold day I can see a drop in pressure just from exiting the interstate and stopping at a red light.

That is question 2.

Am I just fooling myself?

That is question 3.

 

[smurfslayer]

Are you saying that there is a 6 psi swing in tire pressure? If so, wouldn't I notice that when I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this. In fact, I can drop fractions of a psi and see it on the gauge.

That is question 1.

What about the dash display? Upor down 3 psi, so 6 total? My dash seems pretty steady, increasing as I drive and get heat, dropping as they cool off. On a really cold day I can see a drop in pressure just from exiting the interstate and stopping at a red light.

That is question 2.

Am I just fooling myself?

That is question 3.

Most tire gauges you find at auto stores are not as precise as we might hope. A decent pressure gauge costs more than 5 bucks. A good motorcycle mechanic will be able to steer you correctly, as tire pressure is quite important to motorcycles.

From this gauge selection, you can establish your baseline or "known good gauge" to observe your TPMS offset. IIRC, the TPMS _can_ have a more generous range of error, up to about 3 psi - someone posted about this on here previously. Mine are pretty close to my known good gauges.

 

[AZ_Ryan]

Are you saying that there is a 6 psi swing in tire pressure? If so, wouldn't I notice that when I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this. In fact, I can drop fractions of a psi and see it on the gauge.

That is question 1.

What about the dash display? Upor down 3 psi, so 6 total? My dash seems pretty steady, increasing as I drive and get heat, dropping as they cool off. On a really cold day I can see a drop in pressure just from exiting the interstate and stopping at a red light.

That is question 2.

Am I just fooling myself?

That is question 3.

Well for starters you need to get a decent tire gauge. If you are seeing that kind of fluctuation then the gauge isnt reading right.

Also, you mentioned a 12-15 psi swing on the track. I HIGHLY doubt that is accurate. Normal psi swings don't shoot up that high, even on the track. 4-5 psi increase with temperature is normal.

If your tires are wearing down the middle that means they are over inflated.

I have run MPS4s on both my last S550s. And I ran both PS4s and Conti extreem contacts on my Mach 1. I currently run Pirellis in my S650. I always followed the door jam and have NEVER had uneven wear. All 3 cars have said 32-33 psi.

On the track I ran the contis at 28 cold and I think they warmed to 34.

Bottom line, get a good gauge and retest. For what its worth, I've found the TPS reading on the dash to always be within about .5 psi to my gauge.

 

[Junkyard Dog]

Well for starters you need to get a decent tire gauge. If you are seeing that kind of fluctuation then the gauge isnt reading right.

Oh, sorry. I guess I should have been careful to communicate better. I am not seeing any fluctuation. None. Zero.

The fluctuations I posted where what I expect hypothetically a plus or minus 3 psi issue would be in the real world.

My gauge is steady. Needle gives me a reading. I press the stem and hiss let a little air out, and it reads a little lower. Fill some air, and Pssst it reads a little higher. It also matches the display on my dashboard.

 

[Junkyard Dog]

I have run MPS4s on both my last S550s. And I ran both PS4s and Conti extreem contacts on my Mach 1. I currently run Pirellis in my S650. I always followed the door jam and have NEVER had uneven wear. All 3 cars have said 32-33 psi.

On the track I ran the contis at 28 cold and I think they warmed to 34.

Thanks!

I almost forgot what the thread was about . . . lol

 

[Junkyard Dog]

Also, you mentioned a 12-15 psi swing on the track. I HIGHLY doubt that is accurate. Normal psi swings don't shoot up that high, even on the track. 4-5 psi increase with temperature is normal.

Not sure what to tell you.

I had to let more air out after the second session and again after the third session, each session I was learning to pick up more speed as I learned the track and listened carefully to the excellent instructor and did everything he said. By the third session he was mostly quiet until after the session.

It may have been more like 8-10 psi. It was also summer in Georgia, and we started early in the morning when it was cool. It obviously grew more oppressively hot throughout the sunny summer day. But it was not and was nothing like 4-5 psi.

I do not know if it matters, but this was with the Trofeo RS.

 

[AZ_Ryan]

Oh, sorry. I guess I should have been careful to communicate better. I am not seeing any fluctuation. None. Zero.

The fluctuations I posted where what I expect hypothetically a plus or minus 3 psi issue would be in the real world.

My gauge is steady. Needle gives me a reading. I press the stem and hiss let a little air out, and it reads a little lower. Fill some air, and Pssst it reads a little higher. It also matches the display on my dashboard.

So what were you describing here then?

"I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this."

 

[Junkyard Dog]

So what were you describing here then?

"I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this."

Explaining again: A hypothetical. As in, "Isn't this what would happen if it was plus or minus 3 psi every time I checked my tire pressure?"

The last sentence was meant to be the real world statement: "I have never experienced anything like this."

I did not realize I needed so badly to work on my communication skills.

 

[Paul's stable]

Are you saying that there is a 6 psi swing in tire pressure? If so, wouldn't I notice that when I check my tire pressure with my handy-dandy cheapo gauge? It shows 35, so I lower, check again, and it shows 40, lower, check again, and it shows, 29? What? So I check again and it shows 35 again. I have never experienced anything like this. In fact, I can drop fractions of a psi and see it on the gauge.

That is question 1.

What about the dash display? Upor down 3 psi, so 6 total? My dash seems pretty steady, increasing as I drive and get heat, dropping as they cool off. On a really cold day I can see a drop in pressure just from exiting the interstate and stopping at a red light.

That is question 2.

Am I just fooling myself?

That is question 3.

I back in the day bought a real good tire pressure gauge and it reads exactly what my TMS on the dash reads. But like any gauge I'm sure there is a plus minus a little bit.

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