06-25-2010, 10:39 AM | #1 |
Private First Class
21
Rep 103
Posts |
SCOTT, could you get this info for me?
Could you ask the engineers who design the chassis of the E82 (1 coupe), what is the torsional rigidity number of this platform? And also, will they increase the M version of the 1 series' rigidity?
|
06-29-2010, 10:38 AM | #2 |
Private First Class
21
Rep 103
Posts |
OK, 4 days without an answer is what I'm worrying about the 1M: the platform.
Yes within the same platform, you can always put in a larger hp engine, a better suspenssion, better wheels & tires etc. to make a 'motorsport' version of a car model. This is not only applied to M cars, it also applies to any car models in the world. But one thing can not be changed: the structure of the platform. You can not change the platform, or else it is exactly like designing a whole new car. The E8x platform was developed long time ago (back to 2003), and I am sure the structural torsional rigidity requirement at that time is not up to the level like what is now (compared within BMW). I am worrying about whether it will make sense to sell a M car with a structural stiffness which is already outdated... |
Appreciate
0
|
06-29-2010, 11:19 AM | #3 |
Resident Kerbalnaut
477
Rep 10,703
Posts |
Just an FYI i don't have any numbers...but the guys that autox their verts don't have any issues.
I only mention this because the verts have the lowest structural rigidity of all the E8xs and we do just fine Last edited by BrokenVert; 06-29-2010 at 12:25 PM.. |
Appreciate
0
|
06-29-2010, 12:20 PM | #4 |
Chemofski
54
Rep 1,295
Posts |
They can add bracing and suspension components that increase this. With that said, I agree it needs to be done to this chassis and a new suspension is GREATLY needed. I don't doubt that ///M will put a lot of energy into this.
__________________
'13 Individual Frozen Brilliant White ///M3 Coupe
Ordered 2/15/12 | Euro Delivery on 9/21/12 | U.S. Redelivery on 12/6/12 | Motor Dead on 7/15/13 '13 Space Gray/Mugello Red X5///M Pavement Punisher | Snow Muncher | Family and Board Hauler | Roadtripper |
Appreciate
0
|
06-29-2010, 01:18 PM | #5 | |
Private First Class
21
Rep 103
Posts |
Quote:
But racing performance is not the only aim of stiffness (or torsional rigidity), IMO its most important role is to improve the driving experience and the ride quality. As a reference BMW E90 has 22,500 Nm/deg of torsional regidity; compared to Audi A8's 25,000 Nm/deg, VW Phaeton's 37,000 Nm/degree, and Rolls-Royce Phantom's 40,500 Nm/degree. Nobody will take a A8, Phaeton or Rolls Royce to autox or racing, but the engineer still need to make the frame of such cars as stiff as possible, to enhance the ride quality. |
|
Appreciate
0
|
06-29-2010, 01:29 PM | #6 | |
Major
482
Rep 1,189
Posts |
Quote:
|
|
Appreciate
0
|
06-29-2010, 02:35 PM | #7 | |
Private First Class
21
Rep 103
Posts |
Quote:
Now this is interesting: the BMW E46 Coupe has 12,500 Nm/deg of torsional rigidity, while E90 has 22,500 Nm/deg. Speaking of time, E8x is born between them, I really want to know how BMW set the strength requirement for this platform around year 2003... |
|
Appreciate
0
|
06-29-2010, 04:05 PM | #8 | |
Major
482
Rep 1,189
Posts |
Quote:
Imagine what the numbers are for the C4 Vette which was known as Lacking in rigidity. Or those cars with hydrolicz, all that twisting and bouncing with all that weight on those huge LWB 60s era cars has to really weaken the chassis. |
|
Appreciate
0
|
11-12-2011, 03:55 PM | #13 | |
Captain
118
Rep 898
Posts
Drives: '69 GT3, GT4, 1M, 912
Join Date: Nov 2010
Location: SF Bay Area, Shenzhen, Oman
|
Quote:
What are you using the numbers for, if I may ask?
__________________
1M, GT4, 1969 Porsche 911 w/ 997 GT3 Cup Motor (435hp & 2,100 lbs)
|
|
Appreciate
0
|
11-13-2011, 02:36 AM | #15 |
Brigadier General
191
Rep 4,848
Posts |
It took you 2 minutes to go through all the post??!
__________________
Macan S Diesel - Carrera White
Macan Turbo - White 1///M - Valencia Orange |
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|