Puncture in rear wheel not detected

[mcbutler]

If you have the non TPMS system it needs to be reset every time you inflate/check your tyres.
This is done via iDrive if you have it, if you dont I have no idea how you would do that, maybe someone else knows?

I thought you had to reset the system for TPMS as well after adjusting tyre pressures.
The tyre system can be reset through the stalks if the car doesnt have idrive.

No idea about TPMS to be honest.

 

[TomZ4]

My Z4 definitely doesn't have direct TMPS, just ABS looks at difference in tyres speed when they are deflated.

I think TMPS is only on some 3.0+l engines as far as I could find on the interwebs.

Still why wouldn't abs pick up fully deflated rear tyre? and it was a quick deflation (hit on a police stinger spike :thumbsdown: ).

 

[Pondy]

Still why wouldn't abs pick up fully deflated rear tyre? and it was a quick deflation (hit on a police stinger spike :thumbsdown: ).

Presuming this is a joke? :?

 

[TomZ4]

Still why wouldn't abs pick up fully deflated rear tyre? and it was a quick deflation (hit on a police stinger spike :thumbsdown: ).

Presuming this is a joke? :?

I wish, there were 2 cars changing tyres on A60 Loughborough last week, something was going on

Stinger Spike image

 

[B21]

Still why wouldn't abs pick up fully deflated rear tyre? and it was a quick deflation (hit on a police stinger spike :thumbsdown: ).

Presuming this is a joke? :?

I wish, there were 2 cars changing tyres on A60 Loughborough last week, something was going on

Stinger Spike image

If you did have a sudden deflation then the ABS sensor based warning system would not have time to do the requisite number of rotations to decide that the tire was flat before you realised it…the primary purpose of the tyre pressure warning systems is to detect under pressure caused by slow leaks / poor maintenance.

Whilst a tyre suddenly deflating is unpleasant it should be controllable..the issue with a low pressure tyre run at high speed over a long period of time is that it overheats without signalling to the driver something is amiss, then it suddenly disintegrates and that is very challenging for the driver, especially at speed.

 

[Nictrix]

Presuming this is a joke? :?

I wish, there were 2 cars changing tyres on A60 Loughborough last week, something was going on

Stinger Spike image

If you did have a sudden deflation then the ABS sensor based warning system would not have time to do the requisite number of rotations to decide that the tire was flat before you realised it…the primary purpose of the tyre pressure warning systems is to detect under pressure caused by slow leaks / poor maintenance.

Whilst a tyre suddenly deflating is unpleasant it should be controllable..the issue with a low pressure tyre run at high speed over a long period of time is that it overheats without signalling to the driver something is amiss, then it suddenly disintegrates and that is very challenging for the driver, especially at speed.

Nicki had a blow out with one of the front tyres on my X6 a few years ago.
The tyre side wall got ripped by a drain on the motorway instantly deflating the tyre.
The TPMS system activated straight away with warning bongs in the cabin.
Im sure its the same system that the Z4 had as its a 2010 model.
It was activated correctly after checking the tyre pressures through the idrive.

 

[B21]

I wish, there were 2 cars changing tyres on A60 Loughborough last week, something was going on

Stinger Spike image

If you did have a sudden deflation then the ABS sensor based warning system would not have time to do the requisite number of rotations to decide that the tire was flat before you realised it…the primary purpose of the tyre pressure warning systems is to detect under pressure caused by slow leaks / poor maintenance.

Whilst a tyre suddenly deflating is unpleasant it should be controllable..the issue with a low pressure tyre run at high speed over a long period of time is that it overheats without signalling to the driver something is amiss, then it suddenly disintegrates and that is very challenging for the driver, especially at speed.

Nicki had a blow out with one of the front tyres on my X6 a few years ago.
The tyre side wall got ripped by a drain on the motorway instantly deflating the tyre.
The TPMS system activated straight away with warning bongs in the cabin.
Im sure its the same system that the Z4 had as its a 2010 model.
It was activated correctly after checking the tyre pressures through the idrive.

TPMS would / could do that as the puter knows the exact pressure directly..

TPMS wasn’t fitted to E89s till at least MY 2013..my 2011 and 2012 E89s have the earlier ABS sensor based version.

Owners manual refers…it’s called Flat Tyre Monitor and the idrive refers the FTM rather than TPMS..

 

[Nictrix]

If you did have a sudden deflation then the ABS sensor based warning system would not have time to do the requisite number of rotations to decide that the tire was flat before you realised it…the primary purpose of the tyre pressure warning systems is to detect under pressure caused by slow leaks / poor maintenance.

Whilst a tyre suddenly deflating is unpleasant it should be controllable..the issue with a low pressure tyre run at high speed over a long period of time is that it overheats without signalling to the driver something is amiss, then it suddenly disintegrates and that is very challenging for the driver, especially at speed.

Nicki had a blow out with one of the front tyres on my X6 a few years ago.
The tyre side wall got ripped by a drain on the motorway instantly deflating the tyre.
The TPMS system activated straight away with warning bongs in the cabin.
Im sure its the same system that the Z4 had as its a 2010 model.
It was activated correctly after checking the tyre pressures through the idrive.

TPMS would / could do that as the puter knows the exact pressure directly..

TPMS wasn’t fitted to E89s till at least MY 2013..my 2011 and 2012 E89s have the earlier ABS sensor based version.

Owners manual refers…it’s called Flat Tyre Monitor and the idrive refers the FTM rather than TPMS..

I maybe used the wrong terminology for the earlier tyre monitoring system.
My X6s monitoring system seems to be the same as the earlier Z4s system without the valve sensors, so as you say probably ABS sensor based.
Still threw up a bong as soon as the tyre deflated.
So maybe the system had not been set properly in the OPs car.

 

[B21]

Nicki had a blow out with one of the front tyres on my X6 a few years ago.
The tyre side wall got ripped by a drain on the motorway instantly deflating the tyre.
The TPMS system activated straight away with warning bongs in the cabin.
Im sure its the same system that the Z4 had as its a 2010 model.
It was activated correctly after checking the tyre pressures through the idrive.

TPMS would / could do that as the puter knows the exact pressure directly..

TPMS wasn’t fitted to E89s till at least MY 2013..my 2011 and 2012 E89s have the earlier ABS sensor based version.

Owners manual refers…it’s called Flat Tyre Monitor and the idrive refers the FTM rather than TPMS..

I maybe used the wrong terminology for the earlier tyre monitoring system.
My X6s monitoring system seems to be the same as the earlier Z4s system without the valve sensors, so as you say probably ABS sensor based.
Still threw up a bong as soon as the tyre deflated.
So maybe the system had not been set properly in the OPs car.

That’s very possible..not properly initialised, different makes / construction, incorrect relative sizes etc.

I know I’ve had some weird effects when I inadvertently ran significantly varied front and rear rolling radius tyres from the DSC unit which is what works this out.

As I said I collected a bolt hole through a front tyre and I smelt hot rubber and mushy steering before the warning system went bong..

Does seem best on slow leaks, caught 3 such ones on the XC70 with the same system.

Glad it worked for you but I guess you already knew you had a problem?

Must have been an unpleasant experience.

As an aside one of the reasons they changed the steering geometry from positive scrub radius to negative as it means in the case of a blow out or split circuit braking failure the car tends still to track straight.

 

[Pondy]

So to sum up;
TPMS (tyre pressure monitoring system) with valve sensors = GOOD
FTMS (flat tyre monitoring system) without valve sensors = CRAP

 

[B21]

So to sum up;
TPMS (tyre pressure monitoring system) with valve sensors = GOOD
FTMS (flat tyre monitoring system) without valve sensors = CRAP

I would prefer..

TPMS (tyre pressure monitoring system) with valve sensors = GOOD
FTMS (flat tyre monitoring system) without valve sensors = NOT AS EFFECTIVE (but cheaper to maintain and simpler to fix)
No warning system = CRAP

 

[Nictrix]

TPMS would / could do that as the puter knows the exact pressure directly..

TPMS wasn’t fitted to E89s till at least MY 2013..my 2011 and 2012 E89s have the earlier ABS sensor based version.

Owners manual refers…it’s called Flat Tyre Monitor and the idrive refers the FTM rather than TPMS..

I maybe used the wrong terminology for the earlier tyre monitoring system.
My X6s monitoring system seems to be the same as the earlier Z4s system without the valve sensors, so as you say probably ABS sensor based.
Still threw up a bong as soon as the tyre deflated.
So maybe the system had not been set properly in the OPs car.

That’s very possible..not properly initialised, different makes / construction, incorrect relative sizes etc.

I know I’ve had some weird effects when I inadvertently ran significantly varied front and rear rolling radius tyres from the DSC unit which is what works this out.

As I said I collected a bolt hole through a front tyre and I smelt hot rubber and mushy steering before the warning system went bong..

Does seem best on slow leaks, caught 3 such ones on the XC70 with the same system.

Glad it worked for you but I guess you already knew you had a problem?

Must have been an unpleasant experience.

As an aside one of the reasons they changed the steering geometry from positive scrub radius to negative as it means in the case of a blow out or split circuit braking failure the car tends still to track straight.

She said she got a fright as she was in the outside lane of the M8 at night.
But after the bong and a pull on the steering the runflats did their job and got her home.