TPM Are they to be believed?

[lbp]

I have constantly noticed a 3-5 lbp difference between what the TPM reports, as compared with multiple tires gauges, all of which are with 1 lbp of each other.

Porsche tells me there is no way to calibrate TPM, nor is it to be considered absolutely accurate, rather it is only an "indication" of actual pressure.

It's a bit disconcerting when the difference drops into the warning range on the TPM, even though my tire pressure gauges say all is OK.

Any comments?

[PAULSPEED]

Trust the gage. The TPM is only good for a comparision

with the gage.

Paul

[sheim911rs]

the TPM is useful for seeing trends....like a tire going down. But I always rely on a good handheld guage to set pressure. If you lower the tire pressures to ~ 28psi cold before a track event that will trigger and error message. I have handled that by starting the "set" process as I head to the grid. As the process procedes during the warm up lap you will then have the actual pressures displayed and can monitor for a tire going down.

[dch475]

I consider the TPM to be a royal pain, and I wish Porsche hadn't bothered. Recently on the track this summer with large fluctuations in tire pressure I received all kinds of hate messages including that I had a flat tire. It was aggravating that I could not reset it and had to put up with the distraction until the next day after the car had set overnight. I wouldn't be caught dead without a gage to check pressures manually.

[lbp]

Yes, I agree with all of the comments, TPM is a half-a$$ed solution. The only saving grace may be when it alerts as to a deflating tire, possibly saving from a rollover scenario when otherwise distracted.

The tire gauge info below is not suggested as an enhancement to TPM,but as a good gauge solution if you want accurate (and equal f-f/r-r) tire pressures.

...excellent gauge:

PsiClops air gauge

PS - this is the right one to get:

Psiclops "Extreme"

Dead nuts on every time. I have a tank of nitrogen/hose reel in the garage at home & keep all our vehicles up to pressure with this system. The tank costs about $100/year leased from AirGas. As delivered the tank has 2000 lbs. of pressure, so a tank regulator is also a requirement (about $100) to keep delivery rates to the hose (which is usually rated at 250 or 300lbs.) within hose pressure limits.

As such, if you use this setup or if you have a high pressure air compressor/tank and you do not have a regulator on it, get one of these with the Psiclops gauge:

Psiclops Hands Free Adapter (+$24.95) p/n: PSIHFA02

Otherwise you may damage the gauge if the pressure delivered to the gauge exceeds the gauge rating of 60lbs.

Edited October 2, 2008 by lbp

[ABelzile]

In my opinion, TMP is a pain and is useless if you go on a track. I had it disconnected along with the pads wear sensors since they have to be changed so often and are not useful because you can be on the metal on the front breaks without a warning !

Now I am not distracted by false warnings anymore and you have to check your pressure manually and pads wear visually anyway.

[telemed911]

Like others have stated, it is inaccurate, especially when reducing pressures for track use. If you switch wheels/tires it also gives you a constant warning on the dash. They are getting too fancy for my purposes - in fact, I hate the central console on the 997 turbos that I have owned - and WTF needs sat/nav and all those buttons, unless they are for adjusting suspension or brake bias from inside the car. It is supposed to be a sports car?

-Gerry

07GT3RS

[PAULSPEED]

Yes, I agree with all of the comments, TPM is a half-a$$ed solution. The only saving grace may be when it alerts as to a deflating tire, possibly saving from a rollover scenario when otherwise distracted.

The tire gauge info below is not suggested as an enhancement to TPM,but as a good gauge solution if you want accurate (and equal f-f/r-r) tire pressures.

...excellent gauge:

PsiClops air gauge

PS - this is the right one to get:

Psiclops "Extreme"

Dead nuts on every time. I have a tank of nitrogen/hose reel in the garage at home & keep all our vehicles up to pressure with this system. The tank costs about $100/year leased from AirGas. As delivered the tank has 2000 lbs. of pressure, so a tank regulator is also a requirement (about $100) to keep delivery rates to the hose (which is usually rated at 250 or 300lbs.) within hose pressure limits.

As such, if you use this setup or if you have a high pressure air compressor/tank and you do not have a regulator on it, get one of these with the Psiclops gauge:

Psiclops Hands Free Adapter (+$24.95) p/n: PSIHFA02

Otherwise you may damage the gauge if the pressure delivered to the gauge exceeds the gauge rating of 60lbs.

Thanks for the link. Me and my friends were at the track and we all

check our gages for a constant pressure. Most of the gages were within three psi of

each other. Becuse of our desire, we started using our own gages for our own cars. It

truly would be nice to have one acurate gage.

Paul

[TRAKCAR]

In my opinion, TMP is a pain and is useless if you go on a track. I had it disconnected along with the pads wear sensors since they have to be changed so often and are not useful because you can be on the metal on the front breaks without a warning !

Now I am not distracted by false warnings anymore and you have to check your pressure manually and pads wear visually anyway.

I have the pads wear sensors disconnected and tie wrapped, how do I disconnect the tire pressure warning system for track wheels?

My track wheels have the sensors, but it keeps giving flat tire warnings all the time even at higher (Too high for the track) PSI.

Or can it be reprogrammed so that it just shows the rough indication of a tire pressure without all the warnings?

Edited October 7, 2008 by TRAKCAR

[PAULSPEED]

Sounds like you need to remove them from the wheel. Next

time you buy new rubber get new air connectors. Keep the

old ones with the transmitters.

Paul

[03-turbo911]

You can remove it via the PIWIS and get rid of it. In the ROW it was an option and I didn't go for it because of a couple of experiences with other Porsche with the same system. Can't beat a good quality tire gauge!