MY05 changed runflat tire pressure recs?
11-23-2004, 07:03 AM
#21
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My Ride: BMW 545iA Black Sapphire
Model Year: 2005
Engine: 545i
Originally Posted by andy545' date='Nov 22 2004, 08:40 AM
I have a MY2005 as well, but my doorjamb indicates 32/28 for my 18"...
[snapback]59206[/snapback]
that should read ( in bars ) :
for 18" 2.2 front 2.6 rear
for 17" 2.4 front 2.8 rear ( winter setup )
................
11-23-2004, 07:36 AM
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My Ride: MY05 545i Jet Black with Auburn interior. SMG, Logic7, Sport Package, Comfort Seats, Navigation.
I have found that inflating low-profile tires up to 36/38 was the threshold for my comfort and handling limit. Above this pressure, my kidneys will shake itself to pieces. Now, with the RFT's I would imagine that threshold pressure should be a lot lower.
I am a much matured driver now
and my tolerance for harshness has sunken to a new low. Therefore, I'd prefer 32/36 for my car from now on.
I am a much matured driver now
and my tolerance for harshness has sunken to a new low. Therefore, I'd prefer 32/36 for my car from now on.
11-23-2004, 08:33 AM
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Interesting comments. I don't see why BMW will want to raise the pressure of the tires. as it is my rears are wearing a bit faster in the middle and I have 34/35 to control a bit the understeering (that was mentioned by an auto cross guy in the E46 fanatics forum). So If increase the rear to anywhere to 40psi i think the middle of the tire will be bold by the end of the month 
..weird. 
.
..weird. .
11-23-2004, 08:39 AM
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My Ride: 2004 545i 6 spd Sports Package | NAV | PDC | Logic 7 | BT retrofit | SW V13.3
Originally Posted by Don Juan' date='Nov 23 2004, 10:33 AM
Interesting comments. I don't see why BMW will want to raise the pressure of the tires. as it is my rears are wearing a bit faster in the middle and I have 34/35 to control a bit the understeering (that was mentioned by an auto cross guy in the E46 fanatics forum). So If increase the rear to anywhere to 40psi i think the middle of the tire will be bold by the end of the month? ..weird. .
..weird. .[snapback]59883[/snapback]
11-23-2004, 10:40 AM
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My Ride: 545Ai, Silver grey, black, poplar, Sport Pkg, Logic 7, Comfort seats, Nav, HUD, PDC, rear shades, and satellite radio
So what do you all think the most likely answer is?:
-The MY05 18" runflat tires are somehow different than MY04.
-BMW just dumbed the recs down.
or
-They purposely raised the recommended pressures to address some issue.
-The MY05 18" runflat tires are somehow different than MY04.
-BMW just dumbed the recs down.
or
-They purposely raised the recommended pressures to address some issue.
11-24-2004, 05:44 AM
#28
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My Ride: 530d SE Saloon 2003: Titanium Silver, Active Steering, Dynamic Drive, Sports Suspension, Star Spoke 138 7.5Jx17'' + Run Flat Tyres, Auto-Dim Interior Mirror, Grey-Flat Weave Cloth, Through Load System inc. Ski-Bag.
Originally Posted by colejl' date='Nov 22 2004, 09:47 PM
Just so I don't feel left out here's my UK 530d pressure tab:
Attachment 3518
For the 124 18" (245/40 & 275/35) this is 35/36 to 39/43.5psi
Anyone else got a 530d with different recommendations? (MY05?)
Attachment 3518
For the 124 18" (245/40 & 275/35) this is 35/36 to 39/43.5psi
Anyone else got a 530d with different recommendations? (MY05?)
[snapback]59440[/snapback]
My UK pressure tab/chart is the same as yours colejl.
Just ordered a digital pressure guage (~?10) btw as a little concerned after reading this thread + others on e60.net.... and my old 2001 Audi 3.0S didn't feel like there were side-wind gusts at motorway speeds as my 530d does even when the weather's calm.
Nev
11-24-2004, 05:54 AM
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A number of owners have commented on the "wander factor" or tramlining that is felt with the run flats. IMO, the more road feel you have, the more these tendencies will be noticed. I do not see it as bad. The car is telling you what the road feels like. This might be more pronounced with low tire pressure. If it really bothers you, trade for a Lincoln and you will never feel the road again. 
I know, my wife has one. 
She likes it that way. 
I know, my wife has one. She likes it that way.
11-26-2004, 01:29 PM
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Originally Posted by Nev' date='Nov 24 2004, 02:44 PM
[quote name='colejl' date='Nov 22 2004, 09:47 PM']Just so I don't feel left out here's my UK 530d pressure tab:
Attachment 3518
For the 124 18" (245/40 & 275/35) this is 35/36 to 39/43.5psi
Anyone else got a 530d with different recommendations? (MY05?)
Attachment 3518
For the 124 18" (245/40 & 275/35) this is 35/36 to 39/43.5psi
Anyone else got a 530d with different recommendations? (MY05?)
My UK pressure tab/chart is the same as yours colejl.
Just ordered a digital pressure guage (~?10) btw as a little concerned after reading this thread + others on e60.net.... and my old 2001 Audi 3.0S didn't feel like there were side-wind gusts at motorway speeds as my 530d does even when the weather's calm.
[/quote]
Hmmm, that's the price you pay for a real sensitive set-up. The active steering may contribute but the wide run-flats are probably to blame