08 TPMS question
#1
02-12-2008, 10:43 AM
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08 TPMS question
I have an 08 MCS and i'm assuming it has the metal stem direct tire pressure sensor. I bought a set of aftermarket wheels comming in this week and i have a lot of questions before i go have them mounted to my stock run flats.
When we dismount how do you get the whole valve stem and sensor off the stock wheel? just press it out?
When you mount them to the new wheel do i make sure the sensor sits flush on the inner lip ,since it is an aftermarket and wont have the recessed groove for the sensor? If the sensor is "floating" or seems unstable how do you remove the sensor from the valve stem? then i guess i'll band them to the center of the wheel and just use the remaining part of the valve stem on the wheels?
Sorry i have so many questions i searched and read as much as i can and i got confused with different ways to do it since there are two types of sensors. Thank you ahead of time.
When we dismount how do you get the whole valve stem and sensor off the stock wheel? just press it out?
When you mount them to the new wheel do i make sure the sensor sits flush on the inner lip ,since it is an aftermarket and wont have the recessed groove for the sensor? If the sensor is "floating" or seems unstable how do you remove the sensor from the valve stem? then i guess i'll band them to the center of the wheel and just use the remaining part of the valve stem on the wheels?
Sorry i have so many questions i searched and read as much as i can and i got confused with different ways to do it since there are two types of sensors. Thank you ahead of time.
#2
02-12-2008, 03:18 PM
5th Gear
I wish I knew how they are installed too. I'm getting a tire place to do mine but I hope they know what they are doing. They've been out for a while now, so I'm hopeful.
I just received the new Beru sensors (for BMW/MINI) I bought on ebay from TireRack for $184. I should get the wheels Friday and get the tires installed next week. Hopefully everything will go smooth.
Maybe the Beru site has something.
I just received the new Beru sensors (for BMW/MINI) I bought on ebay from TireRack for $184. I should get the wheels Friday and get the tires installed next week. Hopefully everything will go smooth.
Maybe the Beru site has something.
#6
02-29-2008, 04:51 AM
5th Gear
I never updated this thread.
It was easy, looking at those directions.
The old rubber stem cuts right off (I never did that before).
The specified washer for the BMW OEM wheels has no bevel, and you can see there was no bevel. I guess some other wheels have a bevel (at the stem) and maybe if you were transferring sensors you'd have to check on that. Come to think of it, maybe new washers wouldn't be a bad idea, although I don't know where you'd get them.
It was easy, looking at those directions.
The old rubber stem cuts right off (I never did that before).
The specified washer for the BMW OEM wheels has no bevel, and you can see there was no bevel. I guess some other wheels have a bevel (at the stem) and maybe if you were transferring sensors you'd have to check on that. Come to think of it, maybe new washers wouldn't be a bad idea, although I don't know where you'd get them.
Last edited by VelvetFoot; 02-29-2008 at 05:07 AM.
#7
02-29-2008, 05:01 AM
The TPMS valve stems need to be removed and transferred to the new wheels. You should contact the company you bought the wheels from and make sure they accept the TPMS valve stems. If they don't know, ask Alec at Tire Rack. If they won't work with the new wheels, you'll either have to get different wheels or use rubber valve stems and deal with the TPMS light being on all the time. Good luck.
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#8
02-29-2008, 06:27 AM
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thanks for all the heads up guy/girls. I transfered the sensors to the new wheels no problems. One thing that was never said that i figured out was that once the nut and washer are on the sensor on the new wheels, if you loosen the Torx bolt on the bottom of the sensor you can rotate/adjust it to sit flush on just about any rim surface. I adjusted mine about 45degrees down and everything works GREAT>!
#10
03-02-2008, 09:14 PM
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You will. I bought my summer wheels with tires and sensors installed from Tire Rack. I had all season tires installed on my OEM wheels to replace the run flats and reused the stock sensors. No problems.
#14
03-03-2008, 10:29 AM
Nevermind the google knew the answer
http://en.wikipedia.org/wiki/Tire_pr...itoring_system
Direct
Direct TPMS delivers real time tire pressure information to the driver of the vehicle - either via a gauge or a simple low pressure warning light. These systems employ physical pressure sensors inside each tire and a means of sending that information from inside the tire to the vehicle instrument cluster.....
[edit]Indirect
Indirect TPMS measures the air pressure indirectly by monitoring individual wheel speeds and other signals available in the vehicle. Most indirect TPMS uses the fact that an under-inflated tire has a slightly smaller diameter than a correctly inflated tire and therefore has to rotate more times to cover a specific distance to detect under-inflation. Such TPMS can detect under-inflation in up to three tires simultaneously but not in all four since the operating principle of these systems is to compare the different wheel speeds and if all four tires lose the same amount of air the relative change will be zero. Newer developments of indirect TPMS can also detect simultaneous under-inflation in all four tires thanks to vibration analysis of individual wheels or analysis of load shift effects during acceleration and/or cornering. Indirect TPMS is cheap and easy to implement since most modern vehicles already have wheel speed sensors for anti-lock braking systems and electronic stability control systems. The disadvantage is that they rely on the user resetting the system by pushing a "Calibration Button" when the tires are changed or re-inflated—forgetting to perform this initialization leads to potentially dangerous false or missing alerts. Another disadvantage of indirect TPMS is that if the Calibration Reset Button is pressed when one or more tires are under-inflated then the system accepts this under-inflation as normal and the driver will be unaware of potentially dangerous tire pressures.
Direct TPMS delivers real time tire pressure information to the driver of the vehicle - either via a gauge or a simple low pressure warning light. These systems employ physical pressure sensors inside each tire and a means of sending that information from inside the tire to the vehicle instrument cluster.....
[edit]Indirect
Indirect TPMS measures the air pressure indirectly by monitoring individual wheel speeds and other signals available in the vehicle. Most indirect TPMS uses the fact that an under-inflated tire has a slightly smaller diameter than a correctly inflated tire and therefore has to rotate more times to cover a specific distance to detect under-inflation. Such TPMS can detect under-inflation in up to three tires simultaneously but not in all four since the operating principle of these systems is to compare the different wheel speeds and if all four tires lose the same amount of air the relative change will be zero. Newer developments of indirect TPMS can also detect simultaneous under-inflation in all four tires thanks to vibration analysis of individual wheels or analysis of load shift effects during acceleration and/or cornering. Indirect TPMS is cheap and easy to implement since most modern vehicles already have wheel speed sensors for anti-lock braking systems and electronic stability control systems. The disadvantage is that they rely on the user resetting the system by pushing a "Calibration Button" when the tires are changed or re-inflated—forgetting to perform this initialization leads to potentially dangerous false or missing alerts. Another disadvantage of indirect TPMS is that if the Calibration Reset Button is pressed when one or more tires are under-inflated then the system accepts this under-inflation as normal and the driver will be unaware of potentially dangerous tire pressures.
#15
07-15-2008, 12:21 AM
Question regarding TPMS in an 08 MCS.......if this is a wireless system then it has a battery.......where is the battery located and how long does it last? I am curious if it is buried inside the wheel and once your battery runs out, you have to pull the tires off the wheels just to replace the battery in the TPMS.....
#16
08-01-2008, 05:17 PM
Yes the battery is on the inside of the tire. Expected Life is about 10 years on TPMS batteries. The bigger risk is, with TPMS being somewhat new, you have to be careful when you get a flat fixed or tire change that the tire shop knows how to remove/install the tire without damaging the TPMS unit. Some still don't, so ask.
Last edited by bobj; 08-05-2008 at 09:07 AM.
#17
08-01-2008, 05:51 PM
I just bought a new set of wheels form edge racing. Before I purchased them I went on ebay and bought the 4 TPMS from tirerack for a total of $184. I then mailed them to edge racing and they mount them in the wheel/tire combo at no extra charge.
This may seem like a lot to do but I looked at it this way.
Locally it was about $20 a tire to mount and balance ($80 a set). Assuming you want to keep your old set mounted like I do, in my case for resale, that will be $160 just for all the mounting and balancing on both sets, plus the hassle.
Someone will also pay more for a set with the TPMS still in them. For example this set of bridgespokes with TPMS just went for $830 on ebay (item number 300240027023). My combo from edge wasnt much more than that and I saved the mounting and balancing costs on two sets of wheels.
This may seem like a lot to do but I looked at it this way.
Locally it was about $20 a tire to mount and balance ($80 a set). Assuming you want to keep your old set mounted like I do, in my case for resale, that will be $160 just for all the mounting and balancing on both sets, plus the hassle.
Someone will also pay more for a set with the TPMS still in them. For example this set of bridgespokes with TPMS just went for $830 on ebay (item number 300240027023). My combo from edge wasnt much more than that and I saved the mounting and balancing costs on two sets of wheels.
#19
08-02-2008, 05:43 PM
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The sensors are held into the wheel with a nut. After taking the cap off look at the stem where it goes into the wheel there should be a nut there. Unscrew it after the tire is dismounted and the sensor will pull out from the inside of the wheel. There is a battery sealing into each sensor and some even are able to charge them by using tire rotation. From experience make sure you replace the o-ring seal everytime you remove and reinstall the sensors. Also not all aftermarket wheels will accept a valve stem mounted sensor. Check with your wheel manufacturer for compatability.
#22
09-15-2009, 06:16 PM
#24
09-16-2009, 06:15 AM
6th Gear
Where do you get the O-ring from to replace and what torque do you use. I just need to replace the O ring and know what torque to use?
I do offer the change over kits for $4.50 per wheel, O ring and valve core. I'd go just past finger tight, its very easy tp strip and destroy the threads.
Alex
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