Can you get tire pressure
#2
AudiWorld Super User
No, it's an indirect system so it recognizes a change, not absolute values.
The A8 may still have the direct system that would offer values.
The A8 may still have the direct system that would offer values.
#3
AudiWorld Super User
The C7 with it's passive TPMS will display the individual tire that's low but with no PSI readout. It usually takes about a 7 PSI drop from the driver's MMI setting before it displays an alert.
#4
Just wanted to chime in here. I am glad Audi is using the "rotational computation" type sensor. The direct sensors that mount inside each wheel on the valve stem are more trouble than they're worth. I have heard about batteries dying right after the warranty runs out, water getting into the electronics, tire shops destroying them when they mount/dismount tires, etc. Not to mention the added expense of buying an additional set of sensors if you're running winter wheels.
#5
its not 100% accurate anyhow, every car that ive had with it is all the same. my current cayenne s has it and its not accurate, when I use a snap-on digital tire gauge it always reads different.
#6
The data geek in me likes the idea of an exact digital readout - and I suspect most of them can be calibrated, so yeah once you put your NIST-traceable pressure gauge on there you'd wanna calibrate the in-car system I suppose :P
#7
AudiWorld Member
Just wanted to chime in here. I am glad Audi is using the "rotational computation" type sensor. The direct sensors that mount inside each wheel on the valve stem are more trouble than they're worth. I have heard about batteries dying right after the warranty runs out, water getting into the electronics, tire shops destroying them when they mount/dismount tires, etc. Not to mention the added expense of buying an additional set of sensors if you're running winter wheels.
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#8
I'm fairly certain the A8 is the only model that still utilizes the in tire sensors, however, I am not sure if it is all of them or if it is an option. I know the previous model A8's would give you not only tire pressure for all 5 tires but internal temperature as well, the temperature readout is a quick way to find out if you have a brake issue, like a stuck caliper or even a bad wheel bearing, if one tire is substantially hotter than the rest it is a sure sign that something is wrong in the area of that wheel. Now I am curious, I am going to look into the newest A8's and see what kind of info you can get from the TPMS system.
#9
I suspect there's a TPMS receiver somewhere and a coding for MMI to use it vs the ABS one...but maybe I'm just an optimist.
#10
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I have three different types of gauges... none of them ever match. I've always been confused as to the acuracy, or lack of, with tire pressure readings.