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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 01-26-2012, 02:41 PM
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ArtL ArtL is offline
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FTM How does this work?

Driving my 2006 750 Li, got a blowout yesterday at 80 mph and had to put on the spare. Four inch hole in the tire, totally gone. After changing the tire I drove off and about 30 miles up the road I get a "Flat Tire" warning in iDrive. Started to freak out until I read that a changed tire requires the resetting of the FTM. I did that and warning went away. My question is how does this system work? My spare tire and rim were new never used. I assume there are sensors somewhere but I didn't do anything except pull the blown tire off and put on the spare. I wonder why the FTM warning came on in a delayed fashion.

Gotta buy new tires now unexpectedly because the other three are worn down enough that with an unrepairable 4th, it's time to do all 4. Not sure where to begin the search because there's a wide range in pricing.

Last edited by ArtL; 01-26-2012 at 02:42 PM.
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  #2  
Old 01-26-2012, 04:27 PM
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1bad540 1bad540 is offline
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I dont remeber which is which, My 750 has the sensors and i reset them when i swap wheels, my 745 i think had ftm and that uses the rotations of the tire, when it senses one is off you get the msge.If you've been contemplating switching wheels nows the time to do it.
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  #3  
Old 01-26-2012, 04:36 PM
ODA CDR ODA CDR is offline
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Continental DWS, you won't be disappointed in performance or price.
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  #4  
Old 01-26-2012, 04:58 PM
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Quote:
Originally Posted by 1bad540 View Post
I dont remeber which is which, My 750 has the sensors and i reset them when i swap wheels, my 745 i think had ftm and that uses the rotations of the tire, when it senses one is off you get the msge.If you've been contemplating switching wheels nows the time to do it.
I would like new wheels but I dunno about the cost. I may be looking at $1400 just for the tires. Plus +!
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  #5  
Old 01-26-2012, 05:15 PM
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Quote:
Originally Posted by ODA CDR View Post
Continental DWS, you won't be disappointed in performance or price.
My current tires are 245/50/18s. Don't seem to find the DWS in that size.
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  #6  
Old 01-26-2012, 05:28 PM
RTGrove RTGrove is offline
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Iirc, the FTM doesnt use sensors. It uses the wheel speed sensor to detect wheel speed diffences due to reduced air pressure (change in circumference). It has to run for a bit at speed to confirm the deviation among tires, which is why the error doesnt show up immediately. I think it was sometime in late 06 production they changed to using actual sensors/transmitters in each tire.
You can tell if you hve the sensors by looking at the valve stems of your tires. If they are metal, they are sensors. If they are rubber, your car uses the wheel speed sensors.
Make sure you check before buying anything...i bought a set of snow tires and rims and assumed i needed the sensors...that was $200 wasted.....
Also, conti dws are very good tires, fwiw. Go to the tirerack.com and they have tons of options, and a great database of user reviews and their own testing. Lots of good info the, and usually very good prices.
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Last edited by RTGrove; 01-26-2012 at 05:31 PM.
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  #7  
Old 01-26-2012, 06:02 PM
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RTGrove, thanks for the explanation. I will have to look more closely tomorrow at the stems. I know the stem caps are metal and I am pretty sure the stems are metal but not sure. I purchased the 750 in August, 2005 so I suppose it was early in the run of 2006 model year.

I am trying to find a price on the DWS in my size but no luck. Searched Tire Rack for my size and only got Conti Sport Contact 3s. That's not an all season tire which I would prefer.
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  #8  
Old 01-27-2012, 07:37 AM
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csmeance csmeance is offline
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Quote:
Originally Posted by ArtL View Post
My current tires are 245/50/18s. Don't seem to find the DWS in that size.
the DWS is made in 235/50/18 which is fairly close to your tire size. It's just a hair narrower but it shouldn't be an issue.
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  #9  
Old 01-27-2012, 08:47 AM
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1bad540 1bad540 is offline
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dont get narrower, if anything go 1 size wider. also Im sure if you check ebay for what 4 new tires will cost you may be able to score a nice set of 19's with good tires.
Here is a decent deal for youhttp://www.ebay.com/itm/18-OEM-BMW-7-SERIES-WHEELS-RIMS-745I-750I-760I-NEW-BRIDGESTONE-TIRES-59539-/120847909056?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item1c2318c0c0
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c5 Corvette 6sp,z51,2"drp,19"ccw'sshrt shft,corsa exh,dd nav
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  #10  
Old 01-27-2012, 04:22 PM
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Thanks. I looked at the 19s and I like them better than my 18s but I really like the Stance Evolution 20" wheels for sale on eBay. I think the listing is $1700 for 4 wheels but I can't find the definitive words in the listing description. I may just do the tires and think about upgrading the wheels when I have more wiggle room on the cash.

I need to do some personal research on tire sizing.
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  #11  
Old 01-27-2012, 04:47 PM
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Ok, so do you think 255/45ZR18 would be a right size to replace my 245/50R18s? They are Bridgestone Turanza EL42s.
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  #12  
Old 01-27-2012, 04:52 PM
AceFX AceFX is offline
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There are two systems........ one is called FTM, the other is called RDC.

As explained by RTGrove

1. FTM - Car uses the DSC system to monitor the wheel rotation comparing them against the other wheels rotation
2. RDC - Car uses individual sensors in each wheel and the spare. When a spare is placed back in the trunk I know that the valve stem must be oriented towards the rear right quarter wheel so the transmitter in that wheel can be picked up by that receiver in that wheel well.

Last edited by AceFX; 01-27-2012 at 05:54 PM.
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  #13  
Old 01-27-2012, 05:22 PM
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ArtL ArtL is offline
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Quote:
Originally Posted by AceFX View Post
There are two systems........ one is called FTM, the other is called RDC.

As explained by RTGrove

1. FTM - Car uses the DSC system to monitor the wheel rotation comparing them against the other wheels rotation
2. RDC - Car uses individual sensors in each wheel and the spare. When a spare is placed back on the trunk I know that the valve stem must be oriented towards the rear right quarter wheel so the transmitter in that wheel can be picked up by that receiver in that wheel well.
Mine must be a DSC because the I drive indicates FTM. I have a full spare tire and factory wheel, no donut. I had a hell of a time loosening the wheel from the mount. All five lugs were off and still it would not budge. A DOT truck came to help and he hit it about a dozen times with a large wooden chock before it came off. Good thing he came by. He said most people hit the tight rims with their donut which I did not have. Spare was way too heavy to do that.
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  #14  
Old 01-31-2012, 05:50 PM
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I decided to buy a used tire for now while I look into new wheels and tires. Found a good one locally and they installed it in record time. I'm good now for a few months my FTM system does another reset. Not sure how long this should take.
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  #15  
Old 02-17-2013, 04:27 PM
ajskcs ajskcs is offline
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I replaced the p zeros with DSW's from discount tire on my 05 745Li and have run back and forth from PHX to ABQ Several times. Great tires. Bought hazard warranty which turned out well as tire picked up nail from my roofers! Yo yos !
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