ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Wheels and Tires
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      12-04-2007, 05:43 PM   #1
JohnZ4greece
New Member
1
Rep
15
Posts

Drives: Z4 Black
Join Date: Oct 2007
Location: Athens

iTrader: (0)

Garage List
2007 z4 2.0lt  [7.00]
Wheel problem!!!

SORRY BUT MY ENGLISH ARE NOT VERY GOOD I WILL TRY TO EXPLAIN WHAT I THINK IS WRONG WITH MY CAR... I CHANGED MY WHEELS BEFORE 2 WEEKS I PUT (17'INC 225, 45) PREVIOUS I HAD THE STANDARD WHEELS 16'INC. AND KNOW I CAN FEEL EVERY deficiency of the road. the steering wheel follows the road, FOLLOWS THE CURVES. I DONT FEEL IT WELL... I HAVE TO PUT STRENGTH WHILE IM DRIVING. LIKE THE TRAIN FOLLOWS THE railway line. I DONT KNOW IF THE PROBLEM IS THE STERRING WHEEL OR THE WHEELS... I DONT KNOW HOW TO EXPLAIN TO YOU BETER...
Appreciate 0
      12-04-2007, 06:21 PM   #2
ROAD EAGLE
Private
1
Rep
87
Posts

Drives: 2005 530I
Join Date: Oct 2006
Location: SAN ANTONIO,TX

iTrader: (0)

Garage List
2005 Z4  [0.00]
I have BMW's 107 Ellipsoid 18" wheels and I have the same issue, My guess that this is normal due to the size and weight of the wheel. But when put in sport mode it feels less.
__________________
Appreciate 0
      12-04-2007, 11:14 PM   #3
rabman5
Captain
United_States
113
Rep
686
Posts

Drives: none
Join Date: Jun 2007
Location: USA

iTrader: (6)

Garage List
2015 BMW M4  [0.00]
It is called tramlining and is very common, especially with run-flat tires. Changing your tires should help. Good Luck.
Appreciate 0
      12-04-2007, 11:35 PM   #4
soeharyo
lettuce
United_States
18
Rep
201
Posts

Drives: 2003 BMW Z4 3.0i
Join Date: Jun 2007
Location: Ann Arbor, MI

iTrader: (0)

i changed to my winter tires... and i still feel not much changes

is this normal richard? anyone?
Appreciate 0
      12-04-2007, 11:52 PM   #5
AlterEgo
25 star General
AlterEgo's Avatar
Australia
3
Rep
128
Posts

Drives: 2007 BMW Z4 3.0si Coupe
Join Date: Jun 2007
Location: Australia

iTrader: (0)

John, if you have RFTs then increase pressure to 38psi. See if this helps.

What about wheel alignment? Get it checked ASAP.
__________________
Sabine: 2007 BMW E86 Z4 3.0si Coupe Montego Blue Metallic
Professional SatNav; Heated/Folding/Auto Dimming Mirrors; Rear Park Distance Control; Heated Electric ///M Sports Seats with Memory; Bi-Xenon Headlamps; 18" 202 Ellipsoid Rims; Brushed Aluminium Trim; Black/Blue Individual Leather; Window Tint; Carver Audio; Paint Protection; Floor Mats; Storage; 6 Speed Automatic with Paddles; OziCozi
Appreciate 0
      12-05-2007, 10:28 AM   #6
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

It's not just the runflat tires...it's the electric steering. You have no physical connection between the steering wheel and the tires...that's why you don't feel anything. The M's hydraulic steering allows for much more feedback.
__________________


07 ///M Coupe (Premium Package) Black Saphire Ext. Imola Red Int.

Best Website EVER!
Appreciate 0
      12-05-2007, 10:49 AM   #7
ZEEFOUR
Private First Class
11
Rep
155
Posts

Drives: 03 Z4 3.0i, 03 MB E55 AMG
Join Date: May 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by Dammmittt View Post
It's not just the runflat tires...it's the electric steering. You have no physical connection between the steering wheel and the tires...that's why you don't feel anything. The M's hydraulic steering allows for much more feedback.
Not correct. Electric steering is a means of "assist" as in the amount of effort required to turn the steering wheel, hydraulic does the same, a means of "assist", as it does with the brakes (hydraulic/power brakes), it does not add any "physical connection", that comes from the steering rack and the linkage back to the steering wheel which both models have. Electric steering has advantages 1.) it came be programmed to give the driver many levels of assist, 2.) it does not rob power from the engine (like the AC compressor).

Hydraulic has been around for many years and works, period. So many ask (enthusiasts) why change? Good question. Some cars are using electric water pumps for the same reason.
Appreciate 0
      12-05-2007, 11:09 AM   #8
Dammmittt
My favorite sign.
Dammmittt's Avatar
South Korea
167
Rep
4,333
Posts

Drives: 2007 M Coupe
Join Date: Dec 2006
Location: Der Autobahnen

iTrader: (0)

While I may have oversimplified the thing...if you look at the steering columns...you'll note the giant electric motor in one where there is none in the other. The electric motor is where all the feed back is lost.

Electric

Hydraulic
__________________


07 ///M Coupe (Premium Package) Black Saphire Ext. Imola Red Int.

Best Website EVER!
Appreciate 0
      12-05-2007, 12:40 PM   #9
ZEEFOUR
Private First Class
11
Rep
155
Posts

Drives: 03 Z4 3.0i, 03 MB E55 AMG
Join Date: May 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by Dammmittt View Post
While I may have oversimplified the thing...if you look at the steering columns...you'll note the giant electric motor in one where there is none in the other. The electric motor is where all the feed back is lost.
The diagram for the hydraulic does not show the powersteering/hydraulic unit only shows the steering linkage. The hydraulic unit looks simular to the electric motor except its located at the bottom of the linkage at the steering rack. Think of electric steering as a electric motor with a worm gear attached to the steering linkage (nothing feeds through it), and the computer/ECU tells it how much to help you turn the wheel based on speed, rpm, etc. The hydraulic works on the same principal except its at the bottom, the linkage goes inside and the unit helps you turn the wheel by applying hydraulic fluid pressure. In both cases some of the road feel/vibration is absorbed into the electric and hydraulic units. But road feedback to the driver is more of a function of the suspension and lack of rubber parts which muffle what the car is doing. If you notice in write-ups about Porsches they all mention that they have the best road feel and feed back to the driver then any other car that is why. Electric steering is new technology much like drive-by-wire, the critics said there was no need for it, it didn't feel like a cable, etc., but nobody complains about it anymore.

Now if your talking recirculating ball vs rack and pinion, i would agree but thats another discussion...
Appreciate 0
      12-05-2007, 01:56 PM   #10
ROAD EAGLE
Private
1
Rep
87
Posts

Drives: 2005 530I
Join Date: Oct 2006
Location: SAN ANTONIO,TX

iTrader: (0)

Garage List
2005 Z4  [0.00]
Quote:
Originally Posted by ZEEFOUR View Post
The diagram for the hydraulic does not show the powersteering/hydraulic unit only shows the steering linkage. The hydraulic unit looks simular to the electric motor except its located at the bottom of the linkage at the steering rack. Think of electric steering as a electric motor with a worm gear attached to the steering linkage (nothing feeds through it), and the computer/ECU tells it how much to help you turn the wheel based on speed, rpm, etc. The hydraulic works on the same principal except its at the bottom, the linkage goes inside and the unit helps you turn the wheel by applying hydraulic fluid pressure. In both cases some of the road feel/vibration is absorbed into the electric and hydraulic units. But road feedback to the driver is more of a function of the suspension and lack of rubber parts which muffle what the car is doing. If you notice in write-ups about Porsches they all mention that they have the best road feel and feed back to the driver then any other car that is why. Electric steering is new technology much like drive-by-wire, the critics said there was no need for it, it didn't feel like a cable, etc., but nobody complains about it anymore.

Now if your talking recirculating ball vs rack and pinion, i would agree but thats another discussion...
Ok great..so in final conclusion it's not a problem, it's something normal and it's not worth taking the car to the dealership for...Right?
__________________
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:02 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST