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TPMS

Discussion in 'A3/S3/Sportback (8P Chassis)' started by galewis, Dec 23, 2006.

  1. galewis
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    galewis Member

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  2. Beddie
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    Beddie Member

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    Some coding with vagcom and the sensors that fit on the inside of the wheel rims X4 iirc...
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  3. d3fy
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    d3fy Active Member

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    It works off the ABS, so with a bit of luck it might already be in place and just the switch and VAGCOM needed
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  4. steve184
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    steve184 Active Member

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    no sensors on wheels with this system. it works by calculating the circumference of the tyre via the abs sensor - as pressure drops the circumference changes ever so slightly and it alarms when it does
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  5. Vertigo1
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    Vertigo1 Active Member

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    You mean it detects the circumference has reduced by comparing the revolution speed of the wheel compared to the other wheels? Clever!

    Only problem with this is if all your tyres are under or over pressure by the same amount the system won't be able to tell althought this is a tad unlikely I'll grant you.
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  6. Dandle
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    Dandle Member

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    It only works by remembering the wheel speed that you set it at(for all four wheels), if pressure drops then the wheel speeds up and you get an error.
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  7. cjp2k
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    cjp2k Member

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    Same as the golf then, I specced it as I am useless at remembering to check my tyres.. and for £45 it seemed worth it
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  8. marriedblonde
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    marriedblonde Moderator

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    Same as the MB B-Class as well although you get it for free in that ;)
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  9. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    No way am I going to trust that. I think I'll stick to checking them myself once a week.
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  10. RobinA3
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    RobinA3 Active Member

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    i am guessing this is not to be used as something that replaces the need to check your tyres weekly, i think its there so that if you have a nail or something in the tyre then you won't need to wait until you next do the check to find out its there.
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  11. Beddie
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    Beddie Member

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  12. Vertigo1
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    Vertigo1 Active Member

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    Yes but the wheel speeds up and slows down as the vehicle does so it needs some way of measuring a discrepancy in this speed after compensating for the vehicle's speed. The only ways I can see this being possible is if it measures the wheel speed relative to the other wheels or it if it has some way of knowing the vehicle's speed other than via the wheels.
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  13. Dandle
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    Dandle Member

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    Yeah thats all id does, you pump your tyres up then set the system. If one wheel changes speed relative to the others then it sets of the warning. It actually works rather well. And gave me a warning with in 1/2 a mile when I changed tyre pressures on our car. Its only really to let you know if your car a developed a puncture while on a journey i guess. It was only £45 so well worth it in my book(same amount as a night in the pub).
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