10-13-2017, 12:03 AM | #23 |
Major
566
Rep 1,290
Posts |
Then try rear m135i bar it?s 15mm vs 12 or 13mm stock, should make a significant difference without compromising suspension independence too much
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
10-19-2017, 08:25 AM | #24 |
Banned
3509
Rep 2,044
Posts |
Hello BMW Experts!
Why do the front BMW bars have two numbers, ie: 25/22.5MM? One person says replacing the back bar is easy. So how hard is replacing the front bar? Do you have to jack the engine or drop the subframe; does removing the struts help? TIA! Murf |
Appreciate
0
|
10-27-2017, 11:24 AM | #25 | |
Second Lieutenant
54
Rep 258
Posts
Drives: F30 320i (328i ECU) M-Sport
Join Date: May 2012
Location: Rostov-on-Don, Russia
|
Quote:
There is a tapering in the middle which makes it 22,5mm there. Both front and rear need lowering subframes. Rear is a little easier.
__________________
'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
|
Appreciate
0
|
10-27-2017, 11:25 AM | #26 |
Second Lieutenant
54
Rep 258
Posts
Drives: F30 320i (328i ECU) M-Sport
Join Date: May 2012
Location: Rostov-on-Don, Russia
|
I confirm- the ride quality is excellent with both M135i front and rear bars.
__________________
'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
Appreciate
1
Lancelot566.00 |
10-27-2017, 11:27 AM | #27 |
Second Lieutenant
54
Rep 258
Posts
Drives: F30 320i (328i ECU) M-Sport
Join Date: May 2012
Location: Rostov-on-Don, Russia
|
Yes it is. Better to do the front with a partner, who can see the bar moving from another side of the subframe to command where to turn it.
__________________
'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler F32 bottom V-bar F80 bottom reinforcement plate Koni Sport, M-Performance springs, M135i Anti-roll bars |
Appreciate
0
|
10-30-2017, 03:48 AM | #28 | |
Major
566
Rep 1,290
Posts |
Quote:
By the way my H&R bars are for sale (shipping to the EU - ridiculous shipping costs elsewhere)
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
|
Appreciate
1
kabrichx133.00 |
10-30-2017, 11:03 PM | #30 | |
Banned
133
Rep 306
Posts |
Quote:
Part numbers? Are you planning to update chart in post #1? Last edited by kabrichx; 10-31-2017 at 12:54 AM.. |
|
Appreciate
0
|
10-31-2017, 02:06 AM | #31 |
Major
566
Rep 1,290
Posts |
The M135i has the same as the 440i M Sport in the table, you can find the part numbers there.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
10-31-2017, 04:07 AM | #33 | |
Major
566
Rep 1,290
Posts |
Quote:
Because indeed rollbars + springs should be considered as a spring system to be matched with dampers, but I have yet to see a vendor providing dampers *and* bars as a kit? KW for instance sell coilovers and anti-roll bars, but nothing says they're designed to match, as the coilovers are designed with stock bars in mind per their own comment when I contacted them a few months ago.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
|
Appreciate
0
|
11-01-2017, 12:32 AM | #34 |
Brigadier General
2870
Rep 3,445
Posts |
Simple actually, adjustable coil-overs.
But apart from that, the stiffer tune of the shockware and simply going with a more aggressive shock/coil-over usually means higher damping rates and less chassis movement. Will it "match exactly"? Hard to say, but if that's what you are after, you either hope for random chance or get adjustables.
__________________
Current: 2018 Camaro SS 1LE, 2023 Colorado ZR2. Former: BMW 428i Gran Coupe.
|
Appreciate
0
|
11-01-2017, 02:57 AM | #35 | |
Major
566
Rep 1,290
Posts |
Quote:
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
|
Appreciate
0
|
11-01-2017, 09:16 AM | #36 | |
Brigadier General
2870
Rep 3,445
Posts |
Quote:
These are adjustable coil over shocks that can adjust the damping: https://www.tirerack.com/suspension/...171101140644:s They have adjusters that can be turned to increase rebound/compression, etc. The more fancy the shocks, the more adjustments you can have. Typically, most adjusters adjust the low-speed effects, which means low shaft-speed. Low-speed shock performance deals with weight shift, chassis movement, chassis stability, etc. When you throw the car into a turn and it leans, it's a low-speed event for the shock shaft. When you hit a pothole at 30mph, it's a relatively fast shock shaft event, where the damping piston has to blow off and bypass a lot of oil very quickly. This can be important to be able to adjust for the proper roadholding for high end racing, but for most people, it's not necessary. This is either pre-set, can be re-valved, or can be adjusted, but it takes fairly complex damping circuits to allow true adjustment of high-speed damping via external adjusters. Low-speed is much more common and the perfect way to offset the effects of your stiffer swaybars. In general, a more aggressive coil-over will have higher damping rates because they assume stiffer springs and sway-bars, hence the terms "stage 1, stage 2 and stage 3 suspension". These usually assume stages of upgrading everything, including swaybars, bushings, links, springs, etc. This is one way to make sure you at least roughly match the shocks to the sways, but if you want to have a better chance of nailing it, get adjustable coil-overs. A lot of this is suspension 101, not that everyone should be this in-tune with suspension, but if you go down this path, you should do some research on basic suspension theory. I do a lot of work with mountain bike shocks and forks, rebuilding, taking apart, servicing, in addition to custom-dampers. Some of these back in the 90s were just complete jokes, some of them though, from custom manufacturers or even the big manufacturers these days, are more high end than you'll find on 99.9% of performance road cars, with twin tube high and low damping circuits and adjustable high and low speed damping. The damping has to match the spring rates, to which the sways contribute.
__________________
Current: 2018 Camaro SS 1LE, 2023 Colorado ZR2. Former: BMW 428i Gran Coupe.
|
|
Appreciate
0
|
11-01-2017, 10:11 AM | #37 |
Major
566
Rep 1,290
Posts |
My mistake I thought you were talking about adjusting spring rate, not dampers, and got confused. Thanks for clarifying.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
11-01-2017, 12:19 PM | #38 |
Banned
133
Rep 306
Posts |
|
Appreciate
0
|
11-01-2017, 12:35 PM | #39 |
Major
566
Rep 1,290
Posts |
Yes both front and rear, thought it best to keep a balanced combination
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
11-02-2017, 12:39 PM | #40 | |
Second Lieutenant
46
Rep 203
Posts |
Quote:
To match dampers to roll bars takes time and lot of track testing with suspension deflection and roll data logging. I loath slammed cars! It’s ridiculous and pointless. |
|
Appreciate
0
|
11-17-2017, 07:19 PM | #41 |
Major General
2460
Rep 5,451
Posts
Drives: F30
Join Date: Oct 2017
Location: Stevenson, WA
|
How involved is a rear sway bar upgrade on a 2014 328i ?
|
Appreciate
0
|
11-25-2017, 04:13 AM | #43 |
Lieutenant
123
Rep 441
Posts |
Four years on, and I can't shake my reality that a 2006 Subaru Legacy (albeit with Bilstein B6 and stiffer RSB) steers with much better agility than my 335i Touring. Can the OP cite the diameter of the RSB from the M235i, assuming they are interchangeable with an F31. If it's slightly stiffer than my OEM M-Sport RSB, then that could be worth trying out to sharpen the steering of my wagon.
__________________
EBII 335i Touring M-Sport (Munich built July 2013)
| 6 Speed Manual | 2VF Adaptive M Suspension | 2VL Variable Sports Steering | 403M wheels | M-Sport brakes | 688 Harman Kardon | 494 Heated Seats | 610 HUD | 322 Comfort Access | 5AC High-Beam Assist | 609 Navigation Professional | |
Appreciate
0
|
11-25-2017, 05:21 AM | #44 |
Major
566
Rep 1,290
Posts |
M235i is the same as 440i, 15mm rear bar so you can give it a try.
And yes, the e46 3 series of 20years ago was a reference, if you want the same sort of experience m140i or m240i is the way to go, 3 series of today is 5 series of yesterday and it’s not even spacious
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|