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Old 21 Jan 2020, 10:53 (Ref:3952558)   #1
dtm0211
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Aircap tyre pressure monitoring system

Hi All,

Has anyone here had experience with the fairly cheap (50 pounds) aircap mounted type pressure monitoring systems? Do they work or fail after a short time?

I would happily go to the internal pressure sensor type but the only downside is when i change a wheel during a trackday i cannot change the pressure sensor with it.

Any advice please.
Many thanks
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Old 21 Jan 2020, 10:56 (Ref:3952559)   #2
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pressure

another model is a more expensive route known as the tyrepal - approx 200 pounds - is it worth going to this level?

Last edited by dtm0211; 21 Jan 2020 at 11:02.
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Old 21 Jan 2020, 11:30 (Ref:3952563)   #3
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ran tyrepal system on a single seater formula car several seasons agoas intended running pressure when hot was about 4-6psi hotter than ambient.

Worked OK, but the system we used updated every couple of minutes, which is fine for road car usage but less satisfactory for track use, so if buying again would look at options with either real-time option or something with a short update frequency, and accept that the battery life in the sensors would suffer. No problems at scruitineering either.

Thankfully never had a puncture but sudden pressure loss should have triggered an alarm, you notice alarm in a normal car, but unsure whether driver would notice in a single seater (noise / vibration / generally being busy) is another matter. More likely would feel it first and could then check display for flashing light.
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Old 22 Jan 2020, 12:48 (Ref:3952731)   #4
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tyre cap models

great thanks for the interesting points. i thought they were all real time sensors - its good to know that some are interval time updates. thanks.

i also thought that the aircap models are relying on the cap tightness in order to keep the air in. It is intentionally pressing in the tyre valve yes?
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Old 22 Jan 2020, 13:03 (Ref:3952733)   #5
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Yes it is at least on the ones I used for a while but not race tested.
Tanks for you very interesting question, an affordable and reliable system on the valve itself could be useful.
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Old 24 Jan 2020, 11:53 (Ref:3953106)   #6
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Certainly the ones a couple of years ago were polled at intervals, they press against the tyre valve pin in order to measure the sensor (you can hear a momentary hiss as you fit them or release them)
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Old 24 Jan 2020, 13:18 (Ref:3953129)   #7
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Thing to be careful of with the cap type systems is that they are easy to damage with wheel to wheel contact which, with they way they work, can mean losing a lot of pressure very quickly. I use them for practise sessions to get an idea of what's going on pressure wise without constant trips back to the pits but I wouldn't use them for a race situation.
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Old 24 Jan 2020, 17:11 (Ref:3953157)   #8
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Depends on the wheel I suppose. On the single seaters they were pretty recessed, and if they were going to get damaged in an accident, you were already involved in a pretty serious accident.
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Old 24 Jan 2020, 17:21 (Ref:3953158)   #9
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Originally Posted by Johno.UK View Post
Thing to be careful of with the cap type systems is that they are easy to damage with wheel to wheel contact which, with they way they work, can mean losing a lot of pressure very quickly. I use them for practise sessions to get an idea of what's going on pressure wise without constant trips back to the pits but I wouldn't use them for a race situation.
Do any series allow them for racing now then?
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Old 24 Jan 2020, 21:21 (Ref:3953205)   #10
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Had no issues racing with one in a UK single seater series. Passed pre-race and post race scruitineering with no comment, and not in any regulations.
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Old 25 Jan 2020, 14:39 (Ref:3953296)   #11
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I’ve played with them. They aren’t that expensive so I thought why not.

I tried to see how the pressure changes as the tyres warm on each corner. It helps if you can’t check pressures straight after being on track.

Not a game changer, but kind of interesting to do.
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Old 25 Jan 2020, 17:49 (Ref:3953315)   #12
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Depends on the wheel I suppose. On the single seaters they were pretty recessed, and if they were going to get damaged in an accident, you were already involved in a pretty serious accident.
Single seaters maybe but certainly not in a tin top. Wheel to wheel contact is extremely common with no issues usually but the cap type sensors protrude quite a way out on most tin top type wheels.
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