TREAD ACT for 2004 cars
07-14-2003, 09:18 AM
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TREAD ACT for 2004 cars
I read today on MSN that thanks to the TREAD ACT that was passed a few years ago, all 2004 production cars have to have a tire pressure monitor. Do we get one in the rx8? Because if we don't, it has to be retrofitted and electronic. Also, the Rx8 is the perfect car for runflats like the toyotas, BMW, corvette, and MINI are using. Anyone have an idea what these should cost? I might trade in the stock tires day 1 for some run flats instead of paying extra for that stupid spare tire kit.
07-14-2003, 09:49 AM
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There have been several threads about the issues regarding changing the stock rims because the tire pressure monitor would not be compatible with anything custom, so, yes, it does come with a pressure monitor. As far as the run flats are concerned, I know a lot of people that would much rather put a more driving-oriented tire on their car for sake of performance rather than a run flat for sake of convenience, but to each their own....
07-14-2003, 10:11 AM
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The final rule was published June 5, 2002.
One of the systems under consideration is a direct monitoring system that requires four (4) sensors, each in a separate tire. The sensors warn the driver when a tire’s pressure has dropped below 25% of the manufacturer’s recommended cold inflation pressure. This system is more precise and will be used on vehicles not equipped with ABS. Some systems can be calibrated to higher standards than NHTSA requirements.
The second system, which is an indirect system - no sensor in the wheel - works with the vehicle’s anti-lock brake system (ABS). It reads a tire’s RPM and compares the rotational speed of each wheel with that of the other wheels. As any single tire pressure drops, its relative rotational speed increases and sends an 'alert' signal. This system alerts the driver when pressure drops below 30% of the manufacturer’s recommended cold inflation pressure.
The sensor system costs 3 times the ABS based system. And remember both these systems donot read tire pressure point by point, by the time you get the warning the tire will be 8-10 PSI low. Check you tire pressures often anyway.
NHTSA estimates that 49 to 79 deaths could have been prevented if all vehicles were equipped with TPMS. The TPMS device, direct and/or indirect, will be mandatory OE equipment on 10% of the 2004 vehicles with the percentage increased each year thereafter until full compliance in 2006.
If you can read the section on TPM (even as an engineer my eyes begin to glaze over
), here's the link:
http://www.nhtsa.dot.gov/cars/rules/...nal/Index.html
TREAD ACT covers alot of stuff.
One of the systems under consideration is a direct monitoring system that requires four (4) sensors, each in a separate tire. The sensors warn the driver when a tire’s pressure has dropped below 25% of the manufacturer’s recommended cold inflation pressure. This system is more precise and will be used on vehicles not equipped with ABS. Some systems can be calibrated to higher standards than NHTSA requirements.
The second system, which is an indirect system - no sensor in the wheel - works with the vehicle’s anti-lock brake system (ABS). It reads a tire’s RPM and compares the rotational speed of each wheel with that of the other wheels. As any single tire pressure drops, its relative rotational speed increases and sends an 'alert' signal. This system alerts the driver when pressure drops below 30% of the manufacturer’s recommended cold inflation pressure.
The sensor system costs 3 times the ABS based system. And remember both these systems donot read tire pressure point by point, by the time you get the warning the tire will be 8-10 PSI low. Check you tire pressures often anyway.
NHTSA estimates that 49 to 79 deaths could have been prevented if all vehicles were equipped with TPMS. The TPMS device, direct and/or indirect, will be mandatory OE equipment on 10% of the 2004 vehicles with the percentage increased each year thereafter until full compliance in 2006.
If you can read the section on TPM (even as an engineer my eyes begin to glaze over
), here's the link:http://www.nhtsa.dot.gov/cars/rules/...nal/Index.html
TREAD ACT covers alot of stuff.
Last edited by RomanoM; 07-14-2003 at 12:26 PM.
07-14-2003, 12:24 PM
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Originally posted by RomanoM
The second system, which is an indirect system - no sensor in the wheel - works with the vehicle’s anti-lock brake system (ABS). It reads a tire’s RPM and compares the rotational speed of each wheel with that of the other wheels. As any single tire pressure drops, its relative rotational speed increases and sends an 'alert' signal. This system alerts the driver when pressure drops below 30% of the manufacturer’s recommended cold inflation pressure.
The second system, which is an indirect system - no sensor in the wheel - works with the vehicle’s anti-lock brake system (ABS). It reads a tire’s RPM and compares the rotational speed of each wheel with that of the other wheels. As any single tire pressure drops, its relative rotational speed increases and sends an 'alert' signal. This system alerts the driver when pressure drops below 30% of the manufacturer’s recommended cold inflation pressure.
07-14-2003, 01:08 PM
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Originally posted by RomanoM
NHTSA estimates that 49 to 79 deaths could have been prevented if all vehicles were equipped with TPMS. The TPMS device, direct and/or indirect, will be mandatory OE equipment on 10% of the 2004 vehicles with the percentage increased each year thereafter until full compliance in 2006.
NHTSA estimates that 49 to 79 deaths could have been prevented if all vehicles were equipped with TPMS. The TPMS device, direct and/or indirect, will be mandatory OE equipment on 10% of the 2004 vehicles with the percentage increased each year thereafter until full compliance in 2006.
Just ranting and raving while I wait for my 8!
norats
Last edited by norats; 07-15-2003 at 01:00 AM.
07-14-2003, 01:25 PM
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Re: TREAD ACT for 2004 cars
Originally posted by RotoRooter
...the Rx8 is the perfect car for runflats like the toyotas, BMW, corvette, and MINI are using. Anyone have an idea what these should cost? I might trade in the stock tires day 1 for some run flats instead of paying extra for that stupid spare tire kit.
...the Rx8 is the perfect car for runflats like the toyotas, BMW, corvette, and MINI are using. Anyone have an idea what these should cost? I might trade in the stock tires day 1 for some run flats instead of paying extra for that stupid spare tire kit.
07-14-2003, 01:41 PM
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Originally posted by Racer X-8
Now, I know I read somewhere that this is the monitoring system that the RX-8 comes with...I'm at work & my stuff is at home...
Now, I know I read somewhere that this is the monitoring system that the RX-8 comes with...I'm at work & my stuff is at home...
Regards,
Gordon
07-14-2003, 06:52 PM
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Well, I'm at home now & found it. It's from a 50 or so - page printout that my salesman printed for me - from a file meant to inform salespeople so they aren't so ignorant about the RX-8 they are selling. Uh, yeah...
The sheet is titled "2004 MAZDA RX-8 PURCHASE MOTIVATION WALKAROUND GUIDE - PERFORMANCE AND HANDLING". Whew!
Section "Tire pressure monitoring system"
- Uses the ABS sensors to detect differences in wheel speed from one wheel to another and activate a display in the instrument panel if the tire pressure is too low.
- Alerts the driver to low tire pressure so that optimum tire pressure can be maintained for better performance and handling.
It's also repeated in the Walkaround guide for things that pertain to "safety" and again for things that pertain to "value for the money".
So, what you are saying is that this is true only on some non-US types, that US has the sensors?
The sheet is titled "2004 MAZDA RX-8 PURCHASE MOTIVATION WALKAROUND GUIDE - PERFORMANCE AND HANDLING". Whew!
Section "Tire pressure monitoring system"
- Uses the ABS sensors to detect differences in wheel speed from one wheel to another and activate a display in the instrument panel if the tire pressure is too low.
- Alerts the driver to low tire pressure so that optimum tire pressure can be maintained for better performance and handling.
It's also repeated in the Walkaround guide for things that pertain to "safety" and again for things that pertain to "value for the money".
So, what you are saying is that this is true only on some non-US types, that US has the sensors?
Last edited by Racer X-8; 07-14-2003 at 07:02 PM.
07-15-2003, 12:07 AM
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Originally posted by Racer X-8
So, what you are saying is that this is true only on some non-US types, that US has the sensors?
So, what you are saying is that this is true only on some non-US types, that US has the sensors?
07-15-2003, 07:18 AM
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BTW, the TREAD Act doesn't require all 2004s to have tire pressure sensing systems, but rather requires that manufacturers begin phasing them in starting with MY 2004.
Last edited by BillK; 07-15-2003 at 08:06 AM.
07-15-2003, 07:58 AM
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Well, good. I was honestly disappointed to read that doc. which I previously posted. Based purely on ignorance, using the ABS to sense tire pressure seemed to me to be not as precise as what I thought we were getting before I read it.
A pressure sensor inside the tire should be pretty darn precise, based on what I know about industrial digital pressure sensors, such as what Keyence makes. I mean reeeeeel precise for this kind of application.
As long as the whole system is robust, I'm happy. I don't want a nuisance idiot light flickering in my dash all the time, that's for sure.
A pressure sensor inside the tire should be pretty darn precise, based on what I know about industrial digital pressure sensors, such as what Keyence makes. I mean reeeeeel precise for this kind of application.
As long as the whole system is robust, I'm happy. I don't want a nuisance idiot light flickering in my dash all the time, that's for sure.
07-15-2003, 08:06 AM
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Originally posted by Racer X-8
Well, good. I was honestly disappointed to read that doc. which I previously posted. Based purely on ignorance, using the ABS to sense tire pressure seemed to me to be not as precise as what I thought we were getting before I read it.
Well, good. I was honestly disappointed to read that doc. which I previously posted. Based purely on ignorance, using the ABS to sense tire pressure seemed to me to be not as precise as what I thought we were getting before I read it.
When researching it earlier, here's what I found:
Under the first set or compliance option, the vehicle's TPMS will be required to warn the driver when the pressure in any single tire or in each tire in any combination of tires, up to a total of four tires, is 25 percent or more below the vehicle manufacturer's recommended cold inflation pressure for the tires, or a minimum level of pressure specified in the standard, whichever pressure is higher. Under the second compliance option, the vehicle's TPMS will be required to warn the driver when the pressure in any single tire is 30 percent or more below the vehicle manufacturer's recommended cold inflation pressure for the tires, or a minimum level of pressure specified in the standard, whichever pressure is higher.
[ ... ]
To facilitate compliance with the options, the rule phases them in by increasing percentages of production. Ten percent of a vehicle manufacturer's light vehicles will be required to comply with either compliance option during the first year (November 1, 2003 to October 31, 2004), 35 percent during the second year (November 1, 2004 to October 31, 2005), and 65 percent during the third year (November 1, 2005 to October 31, 2006). These percentages are the same as those in the preliminary determination about the final rule. The agency is allowing carry-forward credits for vehicles that are manufactured during the phase-in and are equipped with TPMSs that comply with the four-tire, 25 percent option. It is not allowing credits for TPMSs complying with the other option for the same reason that the agency is requiring manufacturers to provide consumers with information about the performance limitations of those systems.
[ ... ]
Beginning November 1, 2006, all passenger cars and light trucks, multipurpose passenger vehicles, and buses under 10,000 pounds GVWR will be required to comply with the requirements in the second part of this final rule. The agency will publish the second part of this final rule by March 1, 2005, in order to give manufacturers sufficient lead time before vehicles must meet the requirements.
[ ... ]
To facilitate compliance with the options, the rule phases them in by increasing percentages of production. Ten percent of a vehicle manufacturer's light vehicles will be required to comply with either compliance option during the first year (November 1, 2003 to October 31, 2004), 35 percent during the second year (November 1, 2004 to October 31, 2005), and 65 percent during the third year (November 1, 2005 to October 31, 2006). These percentages are the same as those in the preliminary determination about the final rule. The agency is allowing carry-forward credits for vehicles that are manufactured during the phase-in and are equipped with TPMSs that comply with the four-tire, 25 percent option. It is not allowing credits for TPMSs complying with the other option for the same reason that the agency is requiring manufacturers to provide consumers with information about the performance limitations of those systems.
[ ... ]
Beginning November 1, 2006, all passenger cars and light trucks, multipurpose passenger vehicles, and buses under 10,000 pounds GVWR will be required to comply with the requirements in the second part of this final rule. The agency will publish the second part of this final rule by March 1, 2005, in order to give manufacturers sufficient lead time before vehicles must meet the requirements.
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