TPMS ??

[Roswell]

Hi everyone, I searched the forum & everyone seems to be having to buy a new set of TPMS for their aftermarket wheels. But why in the world my dealership is telling me I don't have TPMS in my wheels, it's in my speed sensors? BTW, my car is Canadian spec... is it different from US spec? Thanks for your help!

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[Sathinas]

Your... speed sensors?

Silly Canadian dealers...

Modern cars get their speed readings from one of two places. Transmission or ABS sensors. Neither, by themselves being a "speed sensor".

I don't see the TPMS being part of either.

[Roswell]

Yeah, I'm confused... they told me that my valve stems is rubber, so I don't have a TPMS installed... it would have to be steel valve. He shown me some cars in the showroom with the steel valve. Maybe, I will have to take my stock rims apart to check.

[Sathinas]

TPMS systems can either be metal, (technically, an alloy, since they are aluminum, not steel), rubber stems.

I know FORDs use both.

[YYZ-E55]

US cars require wheel-mounted sensors. Canadian cars do not (for most models).

The Canadian cars use the wheel speed sensors (yes, that is what they are referred to as) to determine if a tire is low on air.

[Roswell]

^^ This is the answer I was looking for... thanks YYZ! So does it means I don't have to buy new TPMS for my new wheels? Is it just a matter of removing my stockies & installing my new wheels... anything to reset on the computer dash afterwards?

[Sathinas]

Using ABS sensors to determine tire inflation? Sounds retardedly complicated...

I understand the math behind the idea, but it sounds like extra work.

[sjhugh]

Australian spec cars also have speed sensors inside the fender, no TPMS needed. Change the rims and tyres as much as you like, just reset the sensors via the display menu using your steering wheel controls buttons.

.

[1st amg]

Your onboard computer may ask you to reset the tire pressures or simply reset the TPMS speed sensors.

[Roswell]

Wow... this site is great!! Thanks for the helpful infos!

[callmiro]

Hey Roswell....

I've got a 2009 Canadian C63 and have aftermarket wheels. I didn't put any tire pressure sensors on mine and no issues at all

[Peter_02AMG]

On the E63 the Canadian TPMS is more advance than the US, they show all four corner and what the actual pressure is in each tires. The US model get a message on the dash if your tires pressure drop than you have to go find which one is actually low.

[Sathinas]

That sucks for US E63'ers.

My W215 shows pressures at each corner.

[Peter_02AMG]

Originally Posted by Sathinas

Using ABS sensors to determine tire inflation? Sounds retardedly complicated...

I understand the math behind the idea, but it sounds like extra work.

That the cheapest way to monitor your tire pressure. Pressure in the tires drop, ABS senses changes in rotations rpm than light up a bulb on your instrument cluster. Very simply and cheap since after 2007 all US car are required by law to be equip with TPS.

[bhamg]

Originally Posted by Sathinas

Using ABS sensors to determine tire inflation? Sounds retardedly complicated...

I understand the math behind the idea, but it sounds like extra work.

I have the wheel speed via ABS sensor system on another car...it is vastly inferior technology that is very cheap to implement and in my experience, totally useless. The one time it actually alerted me prior to a flat I already could feel something was wrong a mile prior and was headed to a gas station anyway. The alert went off when I had pulled in next to the air pump. I had set the system for 36lbs, the alert sounded at 11lbs.

[Sathinas]

I understand it's cheaper than actual TPMS sensors. After all, copies of software are cheaper than copies of hardware.

Still, it takes CPU cycles to count rotational speeds and calculate pressures.

I'm curious now, just how accurate is the "ABS" way of measuring tire pressures? ±1PSI? 2? 5?

[sjhugh]

Just as a side note, my BMW with ‘run flats’ doesn’t use TPMS, it uses the speed sensor system similar to our Australian spec C63. The only difference is, you are required to input the pressure values for each tyre when resetting the system. Our laws here don’t require any tyre pressure monitoring at all.

.

[dremorg]

Originally Posted by Peter_02AMG

On the E63 the Canadian TPMS is more advance than the US, they show all four corner and what the actual pressure is in each tires. The US model get a message on the dash if your tires pressure drop than you have to go find which one is actually low.

You are right and that sucks having to search to find out which tire is low!

[Jae Duk]

If you get wheels, they can take the tpms out from the stock to the aftermarket ones. Mine was taken off and put on my new wheels.

[Roswell]

It's funny how Mercedes built cars differently for each countries... i mean the TPMS system should be the same on every car in my opinion.

[ZephyrAMG]

+1 Complications, complications....

[Roswell]

Originally Posted by Jae Duk

If you get wheels, they can take the tpms out from the stock to the aftermarket ones. Mine was taken off and put on my new wheels.

This is good for US spec cars... my (Canada) stock wheels doesn't have TPMS sensors. And even if they did, I would prefer to buy an extra set in case I would need the stockies as spare wheels.

[Mort]

Not needing the TPMS sensors can save a lot of mounting problems, maybe open up wheel options and help reduce balancing issues. I would rather not have the sensors or the complications that come with them.

I have been able to monitor my tire pressure myself for 45 years and think I can handle it for the foreseeable future.

So, I for one, am just as happy without them.

[Sathinas]

They had cars 45 years ago in the time of the dinosaurs?


/hides

[Mort]

Originally Posted by Sathinas

They had cars 45 years ago in the time of the dinosaurs?


/hides

Hahaha....I thought that might get a rise out of someone.