Did your know that the tire monitoring on Fords is NOT that accurate?

[roket]

from my experience, the TPMS sensors are pretty spot-on. i have seen no more than 1 psi difference in mine, but that may be due to the fact that it does not show decimals, and instead rounds the number to the nearest whole. the only real downside is how fragile the sensors themselves are

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[roadpilot]

If you're relying on TPMS sensors to let you know when you're 1 or 2 PSI off, then you have no idea what the primary purpose of TPMS sensors are.

Basically, they are there to help inform MOST drivers that "Hey, bro, there's something wrong with your tire -- better get it checked out before it goes flat!"

IMHO, they are nothing short of the idiot lights on the dash. Those don't measure temps or pressures to any real accuracy ... they are intended to help you avoid a problem happening in order to address it BEFORE you find yourself stranded somewhere.

That said, I've used a variety of reputable gauges over the years. My Ford and Lincoln vehicles have never been off more than 1-2 PSI.

 

[LouG]

Schrader makes the TPMS sensors and IMHO they are some of the best out there.

Cripes just PSI from 48 to 75 degrees is 3 PSI different

Exactly. I'll put 32psi in and in 30 kms driving it's showing 34/35psi

 

[Wiley Marmot]

@Wiley Marmot did you reuse the sensors from your original wheels? Were you noticing these readings with the OEM setup?

Fair question.

The sensors in my LMR sourced SVE wheels came with the wheel/tire package; no idea what brand they are.

I only had my OEM wheels, tires, and sensors on my GT for 425 miles, and don't remember if there was a disparity between them and my Victor gage and air pump. BTW: Those OEM sensors are now living in the Voxx 20 x 9 wheels that I used to replace my OEM wheels at that 425 mile mark; before replacing the Voxx wheels/OEM all seasons with the SVE wheel and tire package last September.

Forum: Wiley, how many wheels and tires DO you have?

Wiley: Too.

 

[AZ_Ryan]

Exactly. I'll put 32psi in and in 30 kms driving it's showing 34/35psi

Well yeah, tire pressure increases as you drive and they heat up. A 2-3 psi increase is normal. It doesn't have anything to do with the sensors.

 

[LouG]

Well yeah, tire pressure increases as you drive and they heat up. A 2-3 psi increase is normal. It doesn't have anything to do with the sensors.

It's how we calculated correct cold pressure on our bikes. We looked for s 5 psi rise after 30 minutes of brisk riding.

 

[Skye]

Skye is the first car I've had with an in-dash display. Settling in with the car, I confirmed a few things:

- Using an AutoMeter 2160, the car and gauge were never more than .5 psi / .034 bar different

- The old-school, pen-style gauge, used for years, was 2 psi / .13 bar off everything; it went in the bin

- The S550 TPMS system rounds-up or rounds down .5 psi / .034, so only whole numbers display

When does the S650 TPMS system alarm? And what's the logic? That IDK. Maybe that's what the tech was attempting to explain. That, when one tire is +/- 3 psi / .20 bar off than the others, TPMS will announce? Someone could test their S650 and report back.

In my truck, I've confirmed through experience that, when any one tire reaches a certain pressure, including when that one tire is higher than the others, it trips. For example, if I air the spare (some cars have TPMS in the spare, some don't) a certain amount over the others, the truck thinks the other four are losing pressure and alarms.

TPMS has a purpose: to let the driver know when a tire is out of range; it is not intended as a replacement for a tire gauge and manual tire inspections. See the placard in the door jamb or Owners Manual (search "TPMS") for references.

Edit,

At the time I did some research on the topic, I commented in another thread. The following lists a federal standard.

https://www.mustang6g.com/forums/threads/tpms-change-parameters.205565/#post-4118501

- National Highway Traffic Safety Administration (NHTSA) Federal Motor Vehicle Safety Standard (FMVSS) 138

- The minimum [key word] standard is to alert the driver within 20 minutes when one or more tire's pressure is 25% or more below the preset reference. Different manufacturers, models or regions might have more-strict standards. For example, a high-performance or high MPG vehicle might alarm when one tire is only 15% low.

- Manufacturers are required to sell a new vehicle with tires operating at the door jamb placard reference. Aftermarket tires with different pressures are not allowed at the time of a new car sale.

 

[Rocket Man]

One of the senior service techs recently told me that the TMS on the Mustang is only accurate to within + or - 3

There's your problem. You believe anything a tech (even a
SENIOR one) would tell you at a dealership? About as honest (or knowledgable) as the salesmen. All of my friends S650 sensors are always within 1 LB of accurate. That's all they are supposed to be. To alert you to a way underinflated tire.

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