old version of TPM works very good.

FotiosF90M5 · 03-25-2008, 01:42 PM

I was impressed by the accuracy of the old passive version of the TPMS my e90 has. I got the warning light this morning and looked at all 4 wheels and tirers and they all looked fine. I checked the pressure and the right front was 3lbs off and the system picked it right up. just thought I'd share my experience.

Amir87 · 03-25-2008, 02:05 PM

What's the difference between old/new TPM version?

MINNOW · 03-25-2008, 02:21 PM

Old system is indirect, using ABS system to detect speed differentials among the 4 wheels/tires.
New system is direct, with individual sensors on each wheel that sends a reading to the OBC.
Advantage of the new system, it tells you which tire is low pressure.
Old system advantage, no need for expensive sensors. (for example for a second set of wheels/tires) It also seems to be fairly accurate.

BK · 03-25-2008, 02:31 PM

Another advantage of the old system -- FTM is not triggered because of a cold morning (all tire pressures a couple of pounds lower). With TPMS, the alert is triggered. Or maybe this is a disadvantage. At least, it's a difference.

EDIT - can anyone in the EU confirm -- I thought even the new cars in the EU had the "old" FTM system, rather than the sensors of the "new" TPMS system? I thought the air pressure sensors were used in the US only because of US regulations. I'll look for the old thread on this topic...

EDIT #2 - here you go: http://www.e90post.com/forums/showthread.php?t=55845

To paraphrase E90Fleet, the new system is the less advanced system, but it is required by US DOT. The old system is the more advanced system, but it is not allowed in the US since 2007.

The Accountant · 03-25-2008, 02:36 PM

Quote:

Originally Posted by BK

Another advantage of the old system -- FTM is not triggered because of a cold morning (all tire pressures a couple of pounds lower). With TPMS, the alert is triggered. Or maybe this is a disadvantage. At least, it's a difference.

EDIT - can anyone in the EU confirm -- I thought even the new cars in the EU had the "old" FTM system, rather than the sensors of the "new" TPMS system? I thought the air pressure sensors were used in the US only because of US regulations. I'll look for the old thread on this topic...

I read this too, but can't confirm. However my boss has the sensors on his A8 - so I can at least say Audis have the sensors (and he had to buy a second set for his winter tires). Even his spare has to have a sensor....oh....to have a spare and a place to put it....how nice.

FotiosF90M5 · 03-25-2008, 04:03 PM

with how often I get new wheels im really glad I have the old version.

03-25-2008, 01:42 PM	#1
FotiosF90M5 ///M Specialist South Shore BMW 770 Rep 7,108 Posts Drives: 2021 M5 Comp BHG/Silverstone Join Date: Jan 2007 Location: South Shore, MA iTrader: (62)	old version of TPM works very good. I was impressed by the accuracy of the old passive version of the TPMS my e90 has. I got the warning light this morning and looked at all 4 wheels and tirers and they all looked fine. I checked the pressure and the right front was 3lbs off and the system picked it right up. just thought I'd share my experience. __________________ 2021 M5 COMPETITION LCI Brands Hatch Gray on SIlverstone, carbon roof, comp wheels, Mperf splitter, carbon pro spoiler, carbon diffuser , carbon paddles, executive pkg. Dinan HAS, RaceChip, dinan spacers, FC stud kit, etc
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03-25-2008, 02:05 PM	#2
Amir87 Gruppe Titan 262 Rep 2,839 Posts Drives: 08 E92 SG/Coral Join Date: Sep 2007 Location: NC iTrader: (37) Garage List 2008 E92 335i [10.00]	What's the difference between old/new TPM version? __________________
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03-25-2008, 02:21 PM	#3
MINNOW Current E90 Fetishist 4 Rep 246 Posts Drives: '07 323i / '04 MINI Cooper Join Date: Apr 2006 Location: Edmonton, Alberta iTrader: (0)	Old system is indirect, using ABS system to detect speed differentials among the 4 wheels/tires. New system is direct, with individual sensors on each wheel that sends a reading to the OBC. Advantage of the new system, it tells you which tire is low pressure. Old system advantage, no need for expensive sensors. (for example for a second set of wheels/tires) It also seems to be fairly accurate.
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03-25-2008, 02:31 PM	#4
BK Smiling politely 165 Rep 7,931 Posts Drives: 330i Join Date: Feb 2006 Location: Washington DC iTrader: (0) Garage List 2006 330i [9.00]	Another advantage of the old system -- FTM is not triggered because of a cold morning (all tire pressures a couple of pounds lower). With TPMS, the alert is triggered. Or maybe this is a disadvantage. At least, it's a difference. EDIT - can anyone in the EU confirm -- I thought even the new cars in the EU had the "old" FTM system, rather than the sensors of the "new" TPMS system? I thought the air pressure sensors were used in the US only because of US regulations. I'll look for the old thread on this topic... EDIT #2 - here you go: http://www.e90post.com/forums/showthread.php?t=55845 To paraphrase E90Fleet, the new system is the less advanced system, but it is required by US DOT. The old system is the more advanced system, but it is not allowed in the US since 2007. __________________ E90 330i Black Sapphire 6MT \| 991.1 C4 Platinum Silver 7MT
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03-25-2008, 04:03 PM	#6
FotiosF90M5 ///M Specialist South Shore BMW 770 Rep 7,108 Posts Drives: 2021 M5 Comp BHG/Silverstone Join Date: Jan 2007 Location: South Shore, MA iTrader: (62)	with how often I get new wheels im really glad I have the old version. __________________ 2021 M5 COMPETITION LCI Brands Hatch Gray on SIlverstone, carbon roof, comp wheels, Mperf splitter, carbon pro spoiler, carbon diffuser , carbon paddles, executive pkg. Dinan HAS, RaceChip, dinan spacers, FC stud kit, etc
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