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      08-26-2015, 02:42 PM   #23
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Originally Posted by CanAutM3 View Post
Once you start tracking, $100 will be pocket change compared to your other expenditures
What compressor and air tank do you use? My compressor is 15 years old: I am thinking of getting a new one.
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      08-26-2015, 08:03 PM   #24
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Originally Posted by dmnc02 View Post
What compressor and air tank do you use? My compressor is 15 years old: I am thinking of getting a new one.
My tanks is a 5 gallon tank I purchased at Canadian tires well over 15 years ago. Not sure they still sell it.

My compressor is about 10 years old, it is a Michelin 130psi 2hp compressor with an 6.5 gallon tank I purchased when I renovated my house.
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      08-26-2015, 08:12 PM   #25
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Originally Posted by CanAutM3 View Post
My tanks is a 5 gallon tank I purchased at Canadian tires well over 15 years ago. Not sure they still sell it.

My compressor is about 10 years old, it is a Michelin 130psi 2hp compressor with an 6.5 gallon tank I purchased when I renovated my house.
I don't think Michelin still sells compressors either. It looks like I will have to do a bit of research on compressors. Thank you.
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      08-26-2015, 08:47 PM   #26
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If you want some onboard compressors Check http://store.arbusa.com/Compressors-C9.aspx , just in case your M needs some air on the go
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      08-26-2015, 09:54 PM   #27
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If you want some onboard compressors Check http://store.arbusa.com/Compressors-C9.aspx , just in case your M needs some air on the go
It would be funny to keep that thing in the M4 I trust the little BMW Mobility Kit will do its job if needed. I am just looking for something nicer for the garage.
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      08-26-2015, 10:04 PM   #28
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Quote:
Originally Posted by aboulfad View Post
Hi,
Given our Canadian cars don't come w TPMS and use some sensors to detect some difference of tire pressure, how accurate is this system?
Driving today in the highway I got the orange Alarm even in the HUD! Parked on hard shoulder and checked, all four tires were equal pressure of 35psi. I had them inflated at 32psi cold.
Probably a false positive.

I'm unsure but you can probably go to your dealer and tell them to adjust the pressure reading so it doesn't give off a false positive aka lower the computer to warn you.

My 328i has given me 2 false positives and I finally had them adjust it to about 32 psi so they stop giving me dumb false positives.
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      08-27-2015, 06:01 AM   #29
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Quote:
Originally Posted by dmnc02

It would be funny to keep that thing in the M4 I trust the little BMW Mobility Kit will do its job if needed. I am just looking for something nicer for the garage.
Just being silly, but check the equivalent of http://canadiantire.ca in the US. It all depends on your needs, if it's just for filling tires with air, anything may do, but if you want to be serious and use it for air tools, then it gets complicated as the advertised specs (cfm) are often not well represented. My bro who off roads with his Land Rover Discovery said that I'd need the gigantic one which would cause vibrations in the whole house : something like 12cfm... I am having enough noise and rumbling with the M in the mornings, don't want to wake the neighbourhood with a gigantic air compressor !
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      08-27-2015, 06:03 AM   #30
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Quote:
Originally Posted by Arcades
...
My 328i has given me 2 false positives and I finally had them adjust it to about 32 psi so they stop giving me dumb false positives.
I am curious about this, how would it work if you readjust the tire pressure for speeds above 160km/hr at 34 Front/37 Rear as indicated in the door sill, would you have to go back and ask them to adjust the computer sensitivity?
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      08-30-2015, 04:45 PM   #31
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Quote:
Originally Posted by Arcades View Post
Probably a false positive.

I'm unsure but you can probably go to your dealer and tell them to adjust the pressure reading so it doesn't give off a false positive aka lower the computer to warn you.

My 328i has given me 2 false positives and I finally had them adjust it to about 32 psi so they stop giving me dumb false positives.
Note that in Canada, we do not have actual pressure sensors inside the wheels. The TPMS system on Canadian models relies on the ABS/DSC wheel speed sensors to detect if a given wheel starts to spin faster than expected (a deflated tire has a lower rolling radius, hence needs to spin faster for the same road speed). So not much the dealer can do .
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      08-30-2015, 04:49 PM   #32
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Quote:
Originally Posted by aboulfad View Post
I am curious about this, how would it work if you readjust the tire pressure for speeds above 160km/hr at 34 Front/37 Rear as indicated in the door sill, would you have to go back and ask them to adjust the computer sensitivity?
The SA does it for you.

When they take your car to the back to check on the tire pressure, they apparently can adjust it so the car's computer will warn you a bit later if the pressure changes. When it happened the 2nd time, he automatically did it for me and I didn't even ask.

The original pressure warning for my 328i would give me a warning if anyone of my tires were off by just 1 psi. And it happened during winter from the temperature changes. Said there wasn't anything wrong with my tires, just the computer being overly sensitive and warn happy about stuff. I remember him telling me he made it so the computer will warn me if the tires were actually in trouble, so a lot of a lower drop in psi. I'm certain he said around 32 psi was the limit for my 328i atm.
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      08-30-2015, 05:21 PM   #33
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Interesting, I wonder if it's something we can code with Esys or ISTA... Thanks.
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      09-08-2015, 07:59 AM   #34
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Quote:
Originally Posted by aboulfad View Post
Interesting, I wonder if it's something we can code with Esys or ISTA... Thanks.
Note that Arcades is from the US. His car has actual pressure sensors in the wheels. As has been previously discussed, whatever is done on US cars regarding TPMS won't work on our Canadian ones
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      09-08-2015, 10:44 AM   #35
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Quote:
Originally Posted by CanAutM3
...

Note that Arcades is from the US. His car has actual pressure sensors in the wheels. As has been previously discussed, whatever is done on US cars regarding TPMS won't work on our Canadian ones
Good point but I didn't investigate further and just yesterday I get another warning about the FTM system is not working, blah Blah... Different than the previous alarm. Checked tires and they were all set to 32psi. I ran all my previous BMW by manually checking every month.

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      09-16-2015, 06:02 PM   #36
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I got another warning again, weird too on the same expressway! I made it downtown to find one tire off by 0.5 psi. Seriously! Everytime I get it my heart drops thinking I had a flat... I will mention it to my dealer to see if something can be done about our stupid sensitive FTM.
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      09-17-2015, 01:00 PM   #37
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Quote:
Originally Posted by aboulfad View Post
I got another warning again, weird too on the same expressway! I made it downtown to find one tire off by 0.5 psi. Seriously! Everytime I get it my heart drops thinking I had a flat... I will mention it to my dealer to see if something can be done about our stupid sensitive FTM.
O.5psi is not enough to trigger the alarm. That little of a pressure drop will not allow the rolling radius to decrease enough for the ABS/DSC wheel speed sensors to pick-up a difference. Something else must be triggering the alarm.
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      09-17-2015, 05:23 PM   #38
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Quote:
Originally Posted by CanAutM3
O.5psi is not enough to trigger the alarm. That little of a pressure drop will not allow the rolling radius to decrease enough for the ABS/DSC wheel speed sensors to pick-up a difference. Something else must be triggering the alarm.
Yeah a faulty sensor? Or some weird interference from that highway as it happened the same place. However the 0.5psi was measured on my el cheapo digital gauge. So maybe it was 1psi, Would that be enough to trigger the FTM?
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      09-18-2015, 10:47 AM   #39
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Quote:
Originally Posted by aboulfad View Post
Yeah a faulty sensor? Or some weird interference from that highway as it happened the same place. However the 0.5psi was measured on my el cheapo digital gauge. So maybe it was 1psi, Would that be enough to trigger the FTM?
I am only going by impression here, no hard technical evidence, but I would say 5~10psi would normally be needed to trigger the alarm IMHO.
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      09-18-2015, 04:14 PM   #40
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Quote:
Originally Posted by CanAutM3 View Post
I am only going by impression here, no hard technical evidence, but I would say 5~10psi would normally be needed to trigger the alarm IMHO.
We've had a frustrating slow to repair slow leak on the MB Wagon for the last few weeks. Normal pressure is 48 psi. When the warning goes off it has usually dropped to 35ish......

YMMV in the F8X but, yeah, would take a lot more than a single psi change to set off the sensor (or they would go off daily in the winter when temps fluctuate)
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      09-18-2015, 04:19 PM   #41
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OK at the risk of asking a 'dumb' question, why don't they come with TPMS? Are the TPMS sensors inaccurate in extremely low temps or is it the huge range in temps from summer to depths of winter where they loose calibration/accuracy?

Quote:
Originally Posted by aboulfad View Post
Hi,
Given our Canadian cars don't come w TPMS and use some sensors to detect some difference of tire pressure, how accurate is this system?
Driving today in the highway I got the orange Alarm even in the HUD! Parked on hard shoulder and checked, all four tires were equal pressure of 35psi. I had them inflated at 32psi cold.
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      09-18-2015, 04:27 PM   #42
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Originally Posted by ciaranob View Post
OK at the risk of asking a 'dumb' question, why don't they come with TPMS? Are the TPMS sensors inaccurate in extremely low temps or is it the huge range in temps from summer to depths of winter where they loose calibration/accuracy?
hahahaha.

no, nothing to do with temperatures (the populated parts of canada arent actually any colder than the northern parts of the US of A and the temperature swings are just as big there as here)...but you are from houston, and i know lots of people from houston for who dont get the 'seasons' and 'snow' thing so you get a pass.....

Mostly just not a government policy to mandate them here (like you have). As for why not, i gather it is just costly, technical and most manufacturers would rather not include them than include them. There has been no big consumer push to include them so....they remain not standard.
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      09-18-2015, 04:36 PM   #43
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Ha - I don't get off that easily I'm afraid - Born and raised in Dublin Ireland so definitely in tune with 'seasons' and miss them in a big way - we have two here hot and frikken' hot

Yeah it would not make much sense for BMW to test these in extreme conditions so right after I posted I realized was not my smartest contribution

Have taught courses up in Fort McMurray where it was -55F and the wind would take it 5-10 lower - pretty extreme

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hahahaha.

no, nothing to do with temperatures (the populated parts of canada arent actually any colder than the northern parts of the US of A and the temperature swings are just as big there as here)...but you are from houston, and i know lots of people from houston for who dont get the 'seasons' and 'snow' thing so you get a pass.....

Mostly just not a government policy to mandate them here (like you have). As for why not, i gather it is just costly, technical and most manufacturers would rather not include them than include them. There has been no big consumer push to include them so....they remain not standard.
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      09-18-2015, 04:45 PM   #44
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Quote:
Originally Posted by CanAutM3
I am only going by impression here, no hard technical evidence, but I would say 5~10psi would normally be needed to trigger the alarm IMHO.
I guess a trip to the dealer is warranted. Just sitting in my car now in my garage, I got a stupid alarm that the FTM system is unable to check ... I grabbed my iPhone to take a pic but it then disappeared. This alarm has appeared twice as the the low tire thingy.

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