07-17-2016, 11:34 AM | #1 |
First Lieutenant
149
Rep 379
Posts |
F30 M Sport ARB
Has anybody replaced the front ARB on their xDrive with one from a M Sport model (25mm dia against 22.5mm dia on xDrive). Need to improve the handling of this car but don't want to go too far from stock ie fitting Birds ARB. Ordered ACS springs and they should be here any day now. Wondering if I should fit better ARB before I get alignment and headlights checked.
|
07-18-2016, 03:20 AM | #2 | |
Major General
6420
Rep 8,500
Posts |
Quote:
If you want flatter cornering stiffer front & rear ARBs will help hugely, depending upon what you choose. Subframes have to be dropped to install the ARBs so definitely wait until afterwards (plus, say, 50-100 miles for things to settle down) for the geometry and headlight alignment.
__________________
Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
|
|
Appreciate
0
|
07-18-2016, 03:52 AM | #4 | |
First Lieutenant
149
Rep 379
Posts |
Quote:
I didn't realise fitting new ARBs was such a big job so I might just fit ACS springs and see how I go on. |
|
Appreciate
0
|
07-18-2016, 03:56 AM | #5 | |
First Lieutenant
149
Rep 379
Posts |
Quote:
I don't have adaptive suspension on my car. Are you happy with how yours handles after fitting ACS springs. Planning to fit mine myself like you did too. |
|
Appreciate
0
|
07-18-2016, 03:58 AM | #6 | ||
Banned
10995
Rep 32,881
Posts |
Quote:
Best to fit the ACS springs first and see how you like it. |
||
Appreciate
0
|
07-18-2016, 07:44 AM | #8 |
First Lieutenant
149
Rep 379
Posts |
|
Appreciate
0
|
07-18-2016, 04:49 PM | #9 | |
Colonel
1437
Rep 2,666
Posts |
Quote:
__________________
335d xdrive 2016 M-Sport
745Le xdrive 2020 M-Sport |
|
Appreciate
0
|
07-18-2016, 05:02 PM | #10 |
General
8567
Rep 19,982
Posts
Drives: 911, Cayenne Turbo, Disco 4
Join Date: Sep 2013
Location: Crieff, Perthshire, Scotland
|
I had birds ARBS all round, then changed them back to standard when I changed to the ACS RS coilovers. Except instead of the standard rear xdrive bar I put in the sdrive one which 1mm thicker 13v12mm.
Whilst the car handles better overall now on the RS suspension I think the turn in was sharper with the beefy birds ARBs. So in summary I would change the rear one or I'd change them both, but definitely not the front one only. I'd get ACS springs first though! There is an adage that suspension engineers use- if you think it's the rear that's the issue then it's the rear, if you think it's the front that's the issue then it's still probably the rear...
__________________
Current: Porsche 911 991 C4S, Porsche Cayenne Turbo, Land Rover Discovery 4. Gone...G01 X3 M40i, Cayman S 987, F31 340i, Cayman GT4, F82 M4 CP, Lotus Exige V6, G20 330e, F30 330e, Boxster S 987, F31 335d, Mini Cooper SD, E89 Z4, E90 330d 320d, E60 520d, E46 330d 320d, MX5s, E30 325i
|
Appreciate
0
|
07-19-2016, 01:08 AM | #12 | |
First Lieutenant
149
Rep 379
Posts |
Quote:
|
|
Appreciate
0
|
07-19-2016, 02:35 AM | #13 |
General
8567
Rep 19,982
Posts
Drives: 911, Cayenne Turbo, Disco 4
Join Date: Sep 2013
Location: Crieff, Perthshire, Scotland
|
That list of cars are some of the best cars BMW have ever made though so perhaps not the best comparisons! However, this 335d is the only BMW I've had that I've felt the need to modify the hell out of, so I know what you mean.
__________________
Current: Porsche 911 991 C4S, Porsche Cayenne Turbo, Land Rover Discovery 4. Gone...G01 X3 M40i, Cayman S 987, F31 340i, Cayman GT4, F82 M4 CP, Lotus Exige V6, G20 330e, F30 330e, Boxster S 987, F31 335d, Mini Cooper SD, E89 Z4, E90 330d 320d, E60 520d, E46 330d 320d, MX5s, E30 325i
|
Appreciate
0
|
07-19-2016, 05:12 AM | #14 | |
First Lieutenant
149
Rep 379
Posts |
Quote:
|
|
Appreciate
0
|
07-19-2016, 05:13 AM | #15 |
General
8567
Rep 19,982
Posts
Drives: 911, Cayenne Turbo, Disco 4
Join Date: Sep 2013
Location: Crieff, Perthshire, Scotland
|
It made a small difference with reducing understeer. Not sure it's worth doing on its own but I wa taking the birds arbs off anyway.
__________________
Current: Porsche 911 991 C4S, Porsche Cayenne Turbo, Land Rover Discovery 4. Gone...G01 X3 M40i, Cayman S 987, F31 340i, Cayman GT4, F82 M4 CP, Lotus Exige V6, G20 330e, F30 330e, Boxster S 987, F31 335d, Mini Cooper SD, E89 Z4, E90 330d 320d, E60 520d, E46 330d 320d, MX5s, E30 325i
|
Appreciate
0
|
07-19-2016, 04:02 PM | #16 | ||
Banned
10995
Rep 32,881
Posts |
Quote:
|
||
Appreciate
0
|
07-19-2016, 04:08 PM | #17 |
First Lieutenant
149
Rep 379
Posts |
|
Appreciate
0
|
07-19-2016, 04:33 PM | #18 |
First Lieutenant
130
Rep 358
Posts |
Personally I wouldn't have a clue to what difference it makes.
If you fit a rear arb to a front drive car which did not have any bar at all,as I have in the past,by what percentage do you improve it? Last edited by XK140; 07-19-2016 at 04:34 PM.. Reason: Error |
Appreciate
0
|
07-19-2016, 04:53 PM | #19 | |||
Major General
3489
Rep 9,709
Posts |
Quote:
|
|||
Appreciate
0
|
07-20-2016, 03:14 AM | #20 |
Banned
10995
Rep 32,881
Posts |
|
Appreciate
0
|
07-20-2016, 04:07 AM | #21 | |
Major General
3489
Rep 9,709
Posts |
Quote:
Also the outer diameter plays a large part in the equation, from memory D to the power of 4 is in that torsion equation. |
|
Appreciate
1
|
07-20-2016, 04:56 AM | #22 |
First Lieutenant
149
Rep 379
Posts |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|