tire pressure sensor redux
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Joined: Oct 2005
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From: Columbia SC
tire pressure sensor redux
OK, I know this has been beaten to death but I have one more question then I'm going to let this go...
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
OK, I know this has been beaten to death but I have one more question then I'm going to let this go...
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
Race Director
Joined: Jan 2005
Posts: 10,924
Likes: 854
From: Daytona Beach FL
OK, I know this has been beaten to death but I have one more question then I'm going to let this go...
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
I purchased another set of C6 rims with new TPS's. I mounted these to see what would happen if I didn't use a reset tool to match them to the car. I wanted to know if I could still access Competition Mode. I understand that the sensors do not register until the car reaches 25 MPH. Before starting, the reading from when the original rims were mounted was 30 PSI all around. After driving some distance, the readings showed 29 PSI and I had no warnings about low or no tire pressure. This reading did not change throughout the drive even though the tires typically gain 1-2 PSI in this weather. So, while the new sensors are obviously not sending accurate data to the car, the car believes that the sensors are sending data. What's going on?
According to the manual the car will go "approximately 1 hour" (that's steady driving without turning off the engine) before you'll get a "Service Tire Monitor" alert.
If you want to try something else, try this - run 2 tires (say, your front tires) with sensors that are registered, and 2 other tires that are not registered. I think that shortly after leaving your garage area you will get some DIC lights and messages. I think the car is more tolerant of zero sensors than it is of a couple of good ones and a couple of bad ones. It won't wait "approximately 1 hour" to give you alerts because it is getting info from a couple of sensors and knows it should be getting info from all of them, but isn't, so it tells you that you've got a sensor problem right away.
If you try that and that's what happens (that's what happened to me), I think it pretty well proves that the car is getting no info at all from any sensor that is not registered.
Bob
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Joined: Oct 2005
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From: Columbia SC
Hi Bob, actually, I did as you suggested but didn't mention it in my thread due to length of the thread without this info. I changed the front wheels and left the rears so the front two were not registered and the rears were. I drove about 20 minutes at city to freeway speeds. All four started off at 30 in the DIC. When I got back home, the front two (unregistered) said 30, the rears (registered) said 32 and 31. I had no warnings and was able to access competition mode w/o problems. I changed the rears to the unregistered sensors after this.
I have a lift in the garage. On it, I have a Ford Ranger. The registered wheels are in the bed of the truck. I park the Vette under this. I don't know where the TPS receiver is located but there is a good bit of metal between where the wheels are and where the receiver, at it's closest point, might be. Can the wheel sensors actually transmit data that far? Could this account for the reading of 29 I got on all four the next morning?
If it takes an hour for the sensors to "reset" then I've got it made. Autocrosses, at best, consist of 5 35-45 second runs - nowhere near an hour. I should be OK w/o the reset tool... This still puzzles me though.
I have a lift in the garage. On it, I have a Ford Ranger. The registered wheels are in the bed of the truck. I park the Vette under this. I don't know where the TPS receiver is located but there is a good bit of metal between where the wheels are and where the receiver, at it's closest point, might be. Can the wheel sensors actually transmit data that far? Could this account for the reading of 29 I got on all four the next morning?
If it takes an hour for the sensors to "reset" then I've got it made. Autocrosses, at best, consist of 5 35-45 second runs - nowhere near an hour. I should be OK w/o the reset tool... This still puzzles me though.
Race Director
Joined: Jan 2005
Posts: 10,924
Likes: 854
From: Daytona Beach FL
Hi Bob, actually, I did as you suggested but didn't mention it in my thread due to length of the thread without this info. I changed the front wheels and left the rears so the front two were not registered and the rears were. I drove about 20 minutes at city to freeway speeds. All four started off at 30 in the DIC. When I got back home, the front two (unregistered) said 30, the rears (registered) said 32 and 31. I had no warnings and was able to access competition mode w/o problems. I changed the rears to the unregistered sensors after this.
I have a lift in the garage. On it, I have a Ford Ranger. The registered wheels are in the bed of the truck. I park the Vette under this. I don't know where the TPS receiver is located but there is a good bit of metal between where the wheels are and where the receiver, at it's closest point, might be. Can the wheel sensors actually transmit data that far? Could this account for the reading of 29 I got on all four the next morning?
If it takes an hour for the sensors to "reset" then I've got it made. Autocrosses, at best, consist of 5 35-45 second runs - nowhere near an hour. I should be OK w/o the reset tool... This still puzzles me though.
I have a lift in the garage. On it, I have a Ford Ranger. The registered wheels are in the bed of the truck. I park the Vette under this. I don't know where the TPS receiver is located but there is a good bit of metal between where the wheels are and where the receiver, at it's closest point, might be. Can the wheel sensors actually transmit data that far? Could this account for the reading of 29 I got on all four the next morning?
If it takes an hour for the sensors to "reset" then I've got it made. Autocrosses, at best, consist of 5 35-45 second runs - nowhere near an hour. I should be OK w/o the reset tool... This still puzzles me though.
It sounds like you'll be fine Auto-Xing with no sensors (or no tool).
Yeah, this is a screwy system we have to deal with!!!
Bob
