TPMS woes

[elc32955]

That's probably one of those manual entries you have to take with a grain of salt. I was trying to keep my tires at 34 PSI cold so when I ran down the road the hot pressure was 36. But, the TPMS doesn't like 34 as it starts alarming on multiple tires on cold startup. So, I'm running 37-38 cold right now (equal to 39-41 hot) and no more alarms. I'd love to lower the setpoints on the system, but it's probably not one of those things we have routine access to. 25 to 28 PSI would probably be a good trip threshold to let you know you have a tire slowly deflating.

[Navy Lifer]

Just another thing to add to the list for future assist from GM.

Anyone know (if TPMS was offered on G8) what the pressure threshold settings were?

[gregc]

Just another thing to add to the list for future assist from GM.

Anyone know (if TPMS was offered on G8) what the pressure threshold settings were?

I'm pretty sure TPMS was standard on G8s because in 2005, all new cars MY 05 sold in the US had to have it.

[storm9c1]

Just another thing to add to the list for future assist from GM.

Anyone know (if TPMS was offered on G8) what the pressure threshold settings were?

I'm pretty sure TPMS was standard on G8s because in 2005, all new cars MY 05 sold in the US had to have it.

+1. We would also have to confirm that it's multi-channel TPMS and not some sort of batch system that was on the earlier cars. I think the early systems didn't index the wheels. It just turned on the light if one or more tires were low but couldn't tell you which tire. I like how the PPV actually tells you which tire. Many cars made just a few years back can't even tell you that.

[Tom Slick]

My 2009 GMC Sierra had TPMS, and it showed each wheel...

Later,
Tom Slick

[Navy Lifer]

Just another thing to add to the list for future assist from GM.

Anyone know (if TPMS was offered on G8) what the pressure threshold settings were?

I'm pretty sure TPMS was standard on G8s because in 2005, all new cars MY 05 sold in the US had to have it.

+1. We would also have to confirm that it's multi-channel TPMS and not some sort of batch system that was on the earlier cars. I think the early systems didn't index the wheels. It just turned on the light if one or more tires were low but couldn't tell you which tire. I like how the PPV actually tells you which tire. Many cars made just a few years back can't even tell you that.

I'm going to assume the G8 used the same basic 4-position display as PPV, but have not confirmed it.

I had a 2004 Impala SS (yes, FWD) that had a "TPMS", but no wheel sensors--it simply relied on the 4 ABS wheel rotation sensors, by constantly measuring variation/comparison to set an alarm--a low tire would register a higher wheel rotation speed for a given distance as the tire pressure dropped and road-to-axle radius decreased, and activate the alarm at a threshold value. Simple and effective, if you ask me.

The need for the more sophisticated individual readout system, with tire pressure info that may or may not be accurate, is a nice bit of technology, and I suppose it's intended to give the "average" driver a warm & fuzzy to see what individual pressures are. For most of "us", I'd like to think that we're not in need of a Nanny to do anything other than tell us that a tire is low, and we'll know what to do from there. I do check pressures myself periodically, not just relying on the dispaly--sensors can and do vary or fail, which only adds to maintenance expense, ultimately, and it's all mandated by the Feds.

No slight of your position intended, Tom (Storm)....just looking at the reality of what technology has done to us...sort of the way that car alarms are so common that they often/largely are ignored, so why have one!?!

[storm9c1]

I had a 2004 Impala SS (yes, FWD) that had a "TPMS", but no wheel sensors--it simply relied on the 4 ABS wheel rotation sensors, by constantly measuring variation/comparison to set an alarm--a low tire would register a higher wheel rotation speed for a given distance as the tire pressure dropped and road-to-axle radius decreased, and activate the alarm at a threshold value. Simple and effective, if you ask me.

Yeah, I'm familiar with that technology as well. I agree it was simple. I'm sure the average person complained that it was useless because they had no idea what tire was low. The average person probably doesn't even know how to use a tire pressure gauge. You'd be surprised by the number of people I talk to who treat cars as a black-box appliance with no other intent but to get from point A to point B, and it has to be a fun ride, complete with plenty of entertainment. They probably wouldn't even "drive" if they were given the option for the car to drive itself. We are special since we are enthusiasts. And we like to DRIVE. And we like to drive V8 muscle cars.

The need for the more sophisticated individual readout system, with tire pressure info that may or may not be accurate, is a nice bit of technology, and I suppose it's intended to give the "average" driver a warm & fuzzy to see what individual pressures are. For most of "us", I'd like to think that we're not in need of a Nanny to do anything other than tell us that a tire is low, and we'll know what to do from there. I do check pressures myself periodically, not just relying on the dispaly--sensors can and do vary or fail, which only adds to maintenance expense, ultimately, and it's all mandated by the Feds.

No slight of your position intended, Tom (Storm)....just looking at the reality of what technology has done to us...sort of the way that car alarms are so common that they often/largely are ignored, so why have one!?!

Oh believe me, prior to the PPV, I owned low-tech cars. The LT1 in the B-Bodies are about as high-tech as I liked, and it's still a cable driven throttle with a simplistic PCM. I absoultely hate the concept of drive by wire. And I don't like the concept of a "body control module". Too complicated IMO. Along with all of the other "nanny" technologies that they are putting in cars these days. I also hate the fact that some newer cars have GPS that can be tracked, and black boxes that can record your every move. A co-worker owns a newer Mazda, and every time he starts the car, there is an audible alarm, and he has to press an "Accept" button on his nav screen to clear a warning message that using the nav while driving is dangerous. WTF. And it locks out the display until he presses that button. That would drive me nuts every time I start the car. Especially the audible alarm, along with the usual dings for seatbelts and every other paranoid thing. The irony is that I'm a computer engineer by day. And I'm certainly no stranger to high-tech. And this is exactly why I hate it! I don't trust it! A car should be driven. If anything gets in my way of driving it, I don't want it.

Since the PPV was destined to be a police-only car, and they have to hold up to severe use, I imagine they purposely aren't including some of these gadgets -- and that's fine by me.

[Navy Lifer]

Interesting to me, that since weather has turned cooler, and I've been able to see cold pressures as low as 31-32 PSI on TPMS, that the nuisance low-pressure alarms that were experienced in the warmer part of the year, and at higher pressures than mentioned above, have not re-occurred (yet)....I'm curious whether it may just be luck, or if the system eventually "learns" a new normal, or if it's something else.

[Pursuit]

This last Friday, my TPMS indicated a low Right Rear, but all of the sensors were reading 32 psi. I inflated all four tires up to 38 and after about a mile of driving the warning went away.

Maurice

[Navy Lifer]

Maurice, how noticeable was the change in ride quality with the 6 PSI cold setting increase?

Are you currently using the Goodyear RS-A's?

I decided from the first day that I wanted to be on other tires than the production offering.