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FJR Motorcycle Forums
FJR Parts & Accessories Discussions
FOBO TPMS saved my a**
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<blockquote data-quote="Fred W" data-source="post: 1372876" data-attributes="member: 3828"><p>From my reading of the fobo manual, the sensors have a small vacuum reference chamber with (nearly) zero pressure, so they always measure the tire pressure in reference to zero, which is the absolute pressure. Since none of us think of tire pressure in absolute pressure terms fobo gives you two display options, neither of which is the absolute pressure:</p><p></p><p>The default is to display the absolute pressure minus 14.7 psi, which is the nominal atmospheric pressure <em>at sea level</em>, no matter what altitude you are actually at. That way your pressure reading will not vary with altitude. Since all <em>other </em>tire pressure gauges reference the local ambient pressure, the sea level fobo reading will differ from what your tire gauge shows you anywhere above sea level.</p><p></p><p>To make the fobo read more like a normal gauge you'd select "Gauge Pressure" in the app. The app will determine your altitude via the GPS in your phone and subtract an approximate altitude offset from the absolute pressure that it measures. I find that is more intuitive and allows me to check the fobo readings against my regular gauge without doing a lot of extra ciphering.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1372876, member: 3828"] From my reading of the fobo manual, the sensors have a small vacuum reference chamber with (nearly) zero pressure, so they always measure the tire pressure in reference to zero, which is the absolute pressure. Since none of us think of tire pressure in absolute pressure terms fobo gives you two display options, neither of which is the absolute pressure: The default is to display the absolute pressure minus 14.7 psi, which is the nominal atmospheric pressure [I]at sea level[/I], no matter what altitude you are actually at. That way your pressure reading will not vary with altitude. Since all [I]other [/I]tire pressure gauges reference the local ambient pressure, the sea level fobo reading will differ from what your tire gauge shows you anywhere above sea level. To make the fobo read more like a normal gauge you'd select "Gauge Pressure" in the app. The app will determine your altitude via the GPS in your phone and subtract an approximate altitude offset from the absolute pressure that it measures. I find that is more intuitive and allows me to check the fobo readings against my regular gauge without doing a lot of extra ciphering. [/QUOTE]
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FOBO TPMS saved my a**
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