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While I agree with most of your comments I'm not going to drag this forum into a discussion about the value, accuracy and pertinence of different measurement units (tempting though the intellectual discussion might be ). Within the frame of reference of a tire monitor all the units serve the same purpose - to give a reasonably accurate and repeatable measure of the pressure in the tire.
My issue is that when I measure using the TPMS sensors and then with the old-school manual guage, within a minute of each other, I get an 8% variance in result. Your comment about the system adjusting for tire temperature is an interesting one and might be the answer. I have not yet lived with these Autel sensors long enough to know whether the reflect the pressure change caused by the tires warming up. I can say, though, that the ones I just removed did do that and I would see a 3 - 5 PSI shift between cold and warm tires. I've no idea what brand the sensors I originally replaced were (certainly not Mercedes originals in a 16 year old vehicle) so regrettably cannot any actionable info on them. Once I've had a chance to take the Autels for a longer run I will report back.
...ALL TPMS sensors do temp offset (always did) check the picture above about autel programmer... they have always transmitted three bits of info - but only bother to show us one part of it
on many BM bikes you can turn on a secret menu to show the temps... nice little safety extra when pressing on at mach 10
Do I understand, from your comment, that they are adjusting the displayed temperature to show some calculated value of the cold pressure or merely that the device is reporting temperature which may or may not be reported on and or used by the vehicle?
Do I understand, from your comment, that they are adjusting the displayed temperature to show some calculated value of the cold pressure or merely that the device is reporting temperature which may or may not be reported on and or used by the vehicle?
now u typed that - try reading post #25 again..... (I thought I'd said exactly that 2 hours ago?)
I lost that comment in the rant about units and, no doubt, further filtered it with my own experience that the car used to show the pressure change as a result of temperature. I don't yet know whether it will with the Autel senders. Anecdotally the old sensors' readying generally matched the little analog device.
on all cars with real TPMS, the temp still moves but with much less volatility than the real changes happening inside the tyre - (although, saying that never really noticed they read oddly low in cold temps) whether or not the curve of old sensors versus new sensors was further refined no idea, I expect so
BMW bikes used to be a 6 digit BT code for their TPMS sensors and had less stability front to rear in tyre pressure display - when they moved 4 or 5 years later to 7 digit BT code sensors they better match the pressure rise together
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Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
). Within the frame of reference of a tire monitor all the units serve the same purpose - to give a reasonably accurate and repeatable measure of the pressure in the tire.
