"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation time of
each tire compared to the others. If a tire is low, it's number of
rotations for a given speed, compared to the other tires will increase.
That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking systems
(which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

"Eisboch" wrote in message
...

"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation time
of each tire compared to the others. If a tire is low, it's number of
rotations for a given speed, compared to the other tires will increase.
That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning. I
have two Buick Lucernes and the newest actually reads out the PSI for each
tire, the older gives a low warning without telling which tire is actually
low. The older system is the one that I understand measured wheel rotation.

"D.Duck" wrote in message
...

"Eisboch" wrote in message
...

"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation time
of each tire compared to the others. If a tire is low, it's number of
rotations for a given speed, compared to the other tires will increase.
That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning. I
have two Buick Lucernes and the newest actually reads out the PSI for each
tire, the older gives a low warning without telling which tire is actually
low. The older system is the one that I understand measured wheel
rotation.

I was unaware of that. Learn something new everyday. It is my
understanding however that most of the tire pressure monitoring systems are
of the type I described.

Eisboch

"Eisboch" wrote in message
news

"D.Duck" wrote in message
...

"Eisboch" wrote in message
...

"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation
time of each tire compared to the others. If a tire is low, it's number
of rotations for a given speed, compared to the other tires will
increase. That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning.
I have two Buick Lucernes and the newest actually reads out the PSI for
each tire, the older gives a low warning without telling which tire is
actually low. The older system is the one that I understand measured
wheel rotation.

I was unaware of that. Learn something new everyday. It is my
understanding however that most of the tire pressure monitoring systems
are of the type I described.

Eisboch

If i recall correctly the senors that measure PSI cost $300~400 to replace

"D.Duck" wrote in message
...

"Eisboch" wrote in message
news

"D.Duck" wrote in message
...

"Eisboch" wrote in message
...

"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation
time of each tire compared to the others. If a tire is low, it's
number of rotations for a given speed, compared to the other tires will
increase. That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning.
I have two Buick Lucernes and the newest actually reads out the PSI for
each tire, the older gives a low warning without telling which tire is
actually low. The older system is the one that I understand measured
wheel rotation.

I was unaware of that. Learn something new everyday. It is my
understanding however that most of the tire pressure monitoring systems
are of the type I described.

Eisboch

If i recall correctly the senors that measure PSI cost $300~400 to replace


A tire pressure gauge is a couple of bucks at Auto Zone.

Eisboch

"Eisboch" wrote in message
...

"D.Duck" wrote in message
...

"Eisboch" wrote in message
news

"D.Duck" wrote in message
...

"Eisboch" wrote in message
...

"Gene" wrote in message
...

Bummer..... I just thought of something... it may be worth the
nitrogen to protect those TMPS sensors...
--


Most of the TMPS systems don't really measure tire pressure.
The system has speed sensors on each wheel and measures the rotation
time of each tire compared to the others. If a tire is low, it's
number of rotations for a given speed, compared to the other tires
will increase. That's what triggers the low pressure warning.

It's a natural add-on capability brought about by anti-lock braking
systems (which require the speed sensors).

So, air or nitrogen means diddily.

Eisboch

What about the sensors that readout PSI and not just the *low* warning.
I have two Buick Lucernes and the newest actually reads out the PSI for
each tire, the older gives a low warning without telling which tire is
actually low. The older system is the one that I understand measured
wheel rotation.

I was unaware of that. Learn something new everyday. It is my
understanding however that most of the tire pressure monitoring systems
are of the type I described.

Eisboch

If i recall correctly the senors that measure PSI cost $300~400 to
replace


A tire pressure gauge is a couple of bucks at Auto Zone.

Eisboch

Ever try to read tire pressure at 70 MPH? 8)

"D.Duck" wrote in message
...



A tire pressure gauge is a couple of bucks at Auto Zone.

Eisboch

Ever try to read tire pressure at 70 MPH? 8)



Good point.

I am not sure I am all for the gadgets and high tech, computer controlled
wizardry in cars.
KISS. I think about the '06 M5 I had (all two of them). They probably
represented the state-of-the-art in electronic, CPU controlled operation
that year, from the engine management systems to the electronically
controlled SMG transmission that operates the clutch electronically.

They were both a disaster. Traded in the first one because it had too many
software "bugs". Transmission would freeze up in neutral. The famous "Red
Cog of Death" would appear on the driver's display and your only option was
to call a flatbed. Traded that in for one that had a later build date that
reportedly had the bugs worked out. Nope. Car was a spectacular
performer, with 500 hp and handling that could safely rocket you along at
over 200 mph if you were so inclined (I wasn't), but the damn thing
wouldn't move half the time due to a software malfunction.

That's when I traded it for the Porsche 911TT. Porsche remains somewhat
"old school" and other than those electronics that are absolutely necessary,
it was a driver's car. I like that.

Ironically though, it was Porsche, back in the late 80's, that developed the
first tire pressure monitoring system, based on speed sensors on all four
wheels.

Eisboch

"Gene" wrote in message
...


http://www.tireindustry.org/features/TPMS.asp
--



My daughter just paid big bucks to pass the MA safety inspection because one
of her tire pressure sensors was bad and showed up as a error code in her
soccer mom, Chrysler mini-van. (I call it her Egg-Mobile).

The MA state inspection is notoriously tough. Everything that the vehicle
was equipped with from the factory must work. If you have a car with a
fancier trim that includes additional lights, side markers or reflectors and
one doesn't work or is broken, it flunks, even though the same exact vehicle
in more vanilla form that doesn't have the extra lights, etc. will pass.

They did, however, get rid of emissions testing by running the car on a
dynamometer and measuring the exhaust gases. Now they just plug into the
car's computer and look for any error codes. Cars built before 2005 are
now exempt from emissions testing.

This really ****ed off a bunch of state authorized and licensed inspection
stations who paid big bucks for the installation of dynamometers in their
inspection bays. They are now tearing them out.

Eisboch