11-21-2015, 05:58 PM | #1 |
Enlisted Member
8
Rep 32
Posts |
anti-roll bars for F20
Hello,
I tuned my car, installed Schnitzer springs on my BMW F20 with M-pack. front lip, rear wing, and the car handles so much bether, especially while doing hi-speed drive. My question is, if anyone have installed anti-roll bars, if you did, can you feel the difference ? keep well everyone |
11-22-2015, 02:21 AM | #2 |
Brigadier General
268
Rep 3,290
Posts |
The car has such bars from the factory, but it is possible to install thicker ones. By only changing the rear bar, you can tune the balance of the car. Stiffer bar to get more oversteer and less traction, thinner bar for more understeer and more traction. Notice that when you go for stiffer springs or anti-roll bars, you also need stiffer dampers. Also notice that the anti-roll bars are more noticeable when you have soft springs.
|
Appreciate
0
|
11-22-2015, 09:20 AM | #3 |
Brigadier General
1912
Rep 4,599
Posts |
I have Birds Anti roll bars with Birds b1 springs.
Car corners flat and as said above Bids combination is thicker rear anti roll bar and soft rear springs. Works well |
Appreciate
0
|
12-11-2015, 02:27 AM | #4 |
Colonel
1112
Rep 2,409
Posts |
How does it impact the balance of the car? My logic says flatter and more grip? What's the compromise?
__________________
M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost
(A Dane in China) |
Appreciate
0
|
12-11-2015, 06:24 AM | #6 |
Brigadier General
268
Rep 3,290
Posts |
|
Appreciate
0
|
12-11-2015, 11:08 PM | #7 |
Colonel
1112
Rep 2,409
Posts |
So on uneven surfaces especially while cornering you might loose traction. As always there is a trade off.
__________________
M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost
(A Dane in China) |
Appreciate
0
|
12-12-2015, 06:57 AM | #8 |
Brigadier General
268
Rep 3,290
Posts |
Also, if you find the right stiffness with very stiff swaybars, that means softer springs. The car will corner flat, but will pitch more (squat and dive). The opposite strategy is stiff springs and soft swaybar. Very little pitch, but more roll.
Notice that swaybars are very nice for fine tuning the balance of the car, if you only change the stiffness in one end of the car. If you run rather stiff coilovers, you might even disconnect one swaybar completely. Remove the front one for better turn in, and the rear one for better traction. |
Appreciate
0
|
12-14-2015, 01:02 AM | #9 |
Brigadier General
1912
Rep 4,599
Posts |
Stiffer rear ARB used with softer rear springs and LSD is how Birds set up my car. This combination works very well on the road with OE adaptive damping.
Will do some track time with this set up in the spring next year. |
Appreciate
0
|
12-14-2015, 01:22 AM | #10 | |
Brigadier General
268
Rep 3,290
Posts |
Quote:
I guess Birds did this to adjust the balance towards oversteer without making it under damped and without sacrificing traction. |
|
Appreciate
0
|
12-14-2015, 02:53 AM | #11 | |
Brigadier General
1912
Rep 4,599
Posts |
Quote:
Front firmer Birds B1 springs and thicker B1 ARBs Rear softer Birds B1 springs and thicker B1 ARBs. Birds recommend only upgrading firmer rear ARB in conjunction with LSD so as traction is not compromised due to firmer rear ARB, which will reduce rear wheel travel. The cars ride is near stock in comfort but well controlled and sport/sport+ is firmer but still very useable on UK roads as car doesn't bounce as can sometimes be the case with firmer suspension on uneven surfaces. My car started out with Birds ARBs and H&R springs which again was fine as H&R spring rates aren't as hard as say eibachs.
__________________
Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI.. |
|
Appreciate
0
|
12-14-2015, 03:05 AM | #12 |
Brigadier General
268
Rep 3,290
Posts |
|
Appreciate
0
|
12-14-2015, 06:12 AM | #13 |
Brigadier General
1912
Rep 4,599
Posts |
Not these days, TUV certs, for both eibach and H&R springs, show some interesting info wrt wire diameter and number of coils.
__________________
Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI.. |
Appreciate
0
|
12-14-2015, 06:40 AM | #14 |
Brigadier General
268
Rep 3,290
Posts |
|
Appreciate
0
|
12-14-2015, 07:01 AM | #15 |
Brigadier General
1912
Rep 4,599
Posts |
Page 4 of the forum link below has some extrapolated data comparing stock M135i and M235i springs rates with aftermarket springs.
http://www.babybmw.net/forum/viewtop...79484&start=45 H&R offer bespoke sport springs for each of these 2 cars whereas Eibach proline is the same for both Mx35i.
__________________
Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI.. |
Appreciate
0
|
12-14-2015, 07:44 AM | #16 | |
Brigadier General
268
Rep 3,290
Posts |
Quote:
|
|
Appreciate
0
|
12-15-2015, 03:01 AM | #17 | |
Brigadier General
1912
Rep 4,599
Posts |
Quote:
However, the combination of ARBs and springs [+ M4 LCA's] with stock MPSS tyres, the handling balance thru corners [tight&slow or fast&open] is neutral.
__________________
Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI.. |
|
Appreciate
0
|
12-18-2015, 01:27 AM | #18 |
Private First Class
14
Rep 111
Posts |
For what it's worth as an example only, I fitted bigger springs onto my truck which were also a fair amount stiffer than the stock springs as they were designed to carry more weight which I did not have. I left off the rear ARB (Anti Roll Bar) entirely and did not get any noticeable body roll.
The Front ARB was a different story though. Removing the front in addition to the rear was like being in a boat when changing lanes on the motorway. Passengers were scared. It was hilariously funny. |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|