11-25-2017, 04:55 PM | #45 | |
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I agree the M135i has fantastic balance. It was my favourite car when I was invited to a track day with a selection of M-cars, including the E92 M3, F10 M5 and F12 M6. Shortly after buying my F31, I drove an F32 435i. The coupe felt much more agile as well, and I note from the table in the OP that it has the same sway bars as the F30. What would explain the difference in handling and steering? I also note that the LCI 440i has the same diameter sway bar up front as my M-sport F31, but thicker ones at the back end. Is the LCI 440i RSB the same part number as the M235i's?
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11-26-2017, 01:59 AM | #46 | ||
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Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
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02-01-2018, 08:44 PM | #47 |
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02-03-2018, 01:52 PM | #48 |
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02-03-2018, 02:08 PM | #49 |
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4 hours is enough for both ends for an experienced shop; first time we did it it was very long, second time maybe 2-3h and we added the powerflex subframe bushings in the process
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02-03-2018, 05:18 PM | #50 |
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The guy said they don't do that many "lesser" f's, but more M3 M4, which are easier to change bars on!
Why did BMW do this to us?? I used to change my rear sway bar when I put my winter tires on & off.... Murf Last edited by Littlebear; 02-03-2018 at 05:23 PM.. |
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02-04-2018, 12:34 AM | #51 |
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Has anyone considered also using polyurethane sway bar bushings ,they tend to help alot as well? Energy suspension has aftermarket sway bar links as well.
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02-04-2018, 02:20 AM | #52 | |
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Having said that, I had the opportunity to drive an M4 for a track day a few months ago and I can say that i now prefer my modified F30 to the f82 overall, i found it a better all purpose car than the m4 which is unnecessarily stiff, sounding bad, and annoyingly braking non-progressive. By i’m getting carried away |
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02-04-2018, 02:21 AM | #53 | |
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Aftermarket bars come with poly bushings as well of course. |
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02-26-2018, 04:23 PM | #54 | |
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02-26-2018, 05:25 PM | #55 | |
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04-27-2018, 06:39 PM | #56 |
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Hello BMW Experts!
I finally got the rear sway bar in, so now have the big 440i sway bars front & rear. I haven't taken the car to the hills yet, so have no driving report. But the install was a royal pain. My 330i, made in 10/16, bog stock suspension, came with no rear bar at all. The first shop I asked managed to replace the front bar, but chickened out on the rear bar because it wasn't a 'replace' like in the front, but more of an unknown. So 'F' them, I dropped my car at a better place this morn who said they could do it. Got a call a few hours later saying they didn't know where to attach the bar at the strut/hub end. WTF!! So I went out and put their fingers on the screw holes. Then they managed for a large price. I also put in the M3/4 front lower lateral links, which give ~ 0.5 degrees camber & have stiffer ball joints & bushings, & maybe are lighter. I put these in myself & had to drive ~ 2 miles for an alignment. I had so much toe it was scary! I should have done an eyeball alignment. But the driving improvement is obvious, with turn-in very nice & sharp. With these bars in, I think I have my suspension where I want it: M-Sport springs, Billie shocks, 440i sway bars, M3/4 lateral links, lite 17" wheels. I'm ready for the dirty back roads.... Murf |
04-27-2018, 06:48 PM | #57 | |
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Can you confirm the part numbers for the sways? How about the part number for the springs? Also - did you go with Bilstein B6? Thats what I was leaning towards at the moment. |
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04-27-2018, 07:33 PM | #58 |
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Hi S,
The 440iLCI/M235i sway bars listed at the start of this thread agree with what REALoem has listed, so I got the biggest factory bars, 2420 & 3476. I got 1 used, and the other new at a lower price than the used one. The springs I got from a member here, from the classifieds. For a little on the spring ID prob, check this thread: http://f30.bimmerpost.com/forums/sho....php?t=1466527 I got Billie B8s. Partly because there are no B6s to be found in this world, but also because in my searches for Billies for sale, I found an official German Bilstein site that wasn't as strict about the drop preferred by the B8. They listed BMW Sport springs as being fine. Much might be advertising.... Murf Last edited by Littlebear; 10-30-2021 at 06:03 AM.. |
04-27-2018, 09:47 PM | #59 | |
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04-28-2018, 12:22 AM | #60 |
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Look for threads about f80 LCA (lower control arms), there are plenty of references on the topic; i went there myself, and back. M3 LCAs are indeed providing added negative camber and the benefits of noticeably sharper turnin, however i got two major drawbacks from them
- high speed stability (~130km/h or 80mph) issues: car became so sensitive to crosswinds that it was dangerous whenever a wind gust or overtaking a big truck - rubbing: these control arms move the wheel further front and started rubbing at the front of the wheel pit. These arms are not made for f30 chassis, bear in mind that f30 and f80 subframes are completely different, unlike previous generations of 3 series. The best way to get more camber is to swap the wheel hubs with the -0.5deg versions intended for f30s (and come as default to m135i/m235i), which respects the intended geometry of the car, other options are to be avoided in my opinion.
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04-28-2018, 12:58 AM | #61 | |
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Out of curiosity, which of the label part numbers in the M235i diagram/link are you referring to? http://www.realoem.com/bmw/enUS/show...diagId=31_0956 Last edited by IK6SPEED; 04-28-2018 at 01:07 AM.. |
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04-28-2018, 01:12 AM | #62 |
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So it's item 2, ending in 651 and 652 (note the -30min mention)
It’s clearly mentioned in the euro version of the parts: http://www.realoem.com/bmw/enUS/show...54#31216853651 “Important! Swivel bearing for camber correction -30 min. is installed as standard equipment on the M135i.” And i guess this is also true for the m235i, strangely however this isn’t mentionned on the US version, i think it’s more likely to be a labeling issue than an actual difference, but who knows...
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04-28-2018, 05:51 AM | #63 |
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I used #10 from this diagram:
http://www.realoem.com/bmw/enUS/show...diagId=31_1123 Pls provide more on the negatives. I'm all ears. Murf |
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04-28-2018, 06:11 AM | #64 |
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I did too, as well as #9 (with F30 bushings in place of F80 bushings which are narrower)
Check my post in this thread : https://f30.bimmerpost.com/forums/sh...1090804&page=5 and see how far ahead the wheel went in the wheel pit (last pic) https://f30.bimmerpost.com/forums/sh...&postcount=107 (edit) Note that - I have not hear anyone else complain of this stability issue. - However the very day I removed these F80 LCAs and switched back to OEM F30 LCAs the stability issues were gone. So there's all the evidence I need to trace the issue to these F8x control arms, but I can't explain why I would be alone with this issue. It could be that I am more sensitive, but tbh the stability issue I had was a real safety issue where the car would swerve by about 1m left or right under wind gusts, e.g. crossing a bridge (sudden wind change) or just slightly stormy weather (sudden gusts), or overtaking a truck (massive aspiration).
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04-28-2018, 09:05 AM | #65 |
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Thanks Sir Lancelot,
for sharing your experience. But with all due respect, I'm not seeing much concern out there. Respected shops like Turner, Birds, HP Autosport, & others are selling or recommending the LCA replacement as plug & play. I seem to have sufficient space in front of the tires, maybe because I'm running stock size. On the E46 many changed the FCAB to a Z4 part (I think) to gain caster, and the slotted top strut mount gave a little more camber. I did both, and liked them. Before this change my F30 had basically zero camber up front. Somehow, I didn't get the alignment sheet last night when I picked up my car, but will try on Monday. I don't think the camber & caster #s are out of range for a road car, the change from stock being fairly minor? Murf Last edited by Littlebear; 04-28-2018 at 09:11 AM.. |
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