TPMS Pressure vs. Accurate Gauge

[F0J]

(Discussed in this subforum because #racecar)

I finally splurged on a proper pressure gauge and I noticed that the TPMS generally over-measures by 1-2PSI relative to the gauge.

Anyone notice the same thing?

Are there any reasons, eg. traction nannies, to calibrate/replace the sensors?

Thanks.

Edits for grammar and added the type of gauge.

http://www.intercompracing.com/99.99-digital-pressure-gauge-p-180-l-en.html

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[Brent Dalton]

Yes, my TPMS sensors and dash reads 3-4 psi higher than my gauge. I haven't found any adverse issues with it reading higher.

 

[zxd9]

(Discussed in this subforum because #racecar)

I finally splurged on a proper pressure gauge and I noticed that the TPMS generally over-measures by 1-2PSI relative to the gauge.

Anyone notice the same thing?

Are there any reasons, eg. traction nannies, to calibrate/replace the sensors?

Thanks.

Edits for grammar and added the type of gauge.

http://www.intercompracing.com/99.99-digital-pressure-gauge-p-180-l-en.html

My TPMS reads 1-2 PSI higher than gauge too.

 

[Built4Speed]

My TPMS also read 3-4 lbs higher than an actual tire pressure gauge. Whats the deal here? Is there anyway to correct these?

 

[Optimum Performance]

Usually within a pound or two.

 

[Terminated]

Yeah, mine read about 1-2 PSI higher- I don't know if you can really do anything to change the calibration and get it dialed in. I just a standard gauge to set my pressure on all 4 and the TPMS is really just to monitor for anything weird.

 

[F0J]

Someone at Intercomp called me to discuss reading pressure and it's much more complicated than I thought. Ambient temperature can have a pretty big effect on the read (either by changing the viscosity of an oil based gauge or the compression of the spring in a spring based gauge). I find that the TPMS system reaches better accuracy once the tires are warm.

 

[SR56]

I had one tire that was a little low due to the air kit in the trunk not sealing up when I tried to add. Took it to the WaWa and had my gauge. Put them all at 33 and the TPMS was right on, although the low tire tends to go 1 psi under. I'm guessing the auto-air shut off thing was off a little with that lower pressure.

I was surprised at how accurate it really was. Riding around watching it is interesting to see how the pressures go up with driving. I can be as high as 35 on the back right and the front driver will be at 33.

Overall, I think it's one of the coolest things I've seen on a car. Instead of just a low pressure, you can get an idea of what it is and how certain driving affects each corner.

 

[Brent Dalton]

They vary. I can have my stock wheels and tires on the car and the TPMS will read 3-4 psi higher than my longacre gauge. I can switch out to my track wheels and the factory ford TPMS in them are normally 1-2 psi off from my longacre gauge.

 

[Optimum Performance]

They vary. I can have my stock wheels and tires on the car and the TPMS will read 3-4 psi higher than my longacre gauge. I can switch out to my track wheels and the factory ford TPMS in them are normally 1-2 psi off from my longacre gauge.

I'm curious do you program them or does the car figure it out?

I just ran out and checked them 33 LH 34 RH. Within a 1/2 pound right now. Gauge to car. I need a real gauge but the car was sitting in the sun on the LH side when I went out for my last session so now that it's been in the garage a few days the pressures have come back to normal and last time I set them to 35ish all the way around, in the sun. I wonder how much it's the moisture content. My cheap digital gauge always reads closer to the TPMS than my cheap mechanical dial gauge. I assume because the digital gauge is basically a TMPS sensor transducer with a display. I mechanical gauge has to move the needle and fill a hose. #DeflateGate

 

[Brent Dalton]

The car figures it out.

 

[stoli]

This is frustrating. Mine used to all be within 1psi of a gauge reading.
In the last few weeks they all started reading 4psi higher in the car. A reset with the built in learn (three toggles of the hazard light switch) doesn't help. I'd really like to get them back to at least close to accurate...

 

[c_reber]

I'm too cheap to buy the TPMS for my track wheels. (And for some reason, I have 4 sets of wheels/tires)

Where's the cheapest place to buy a set of 4? I think I grabbed a set on ebay for ~$60 a while ago?

 

[NightmareMoon]

Levittown Ford Parts has great prices on the TPMS sensors, but crappy shipping, so might be worth it for a set of 4

 

[Built4Speed]

I'm too cheap to buy the TPMS for my track wheels. (And for some reason, I have 4 sets of wheels/tires)

Where's the cheapest place to buy a set of 4? I think I grabbed a set on ebay for ~$60 a while ago?

Rockauto

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