11-09-2015, 05:59 AM | #1 |
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M135i F20 - switching from H&R sport springs to Birds B1 springs
My adaptively damped car had its springs changed recently.
I now have Birds b1 springs to compliment the Birds ARBS, Quaife LSD, and M4 LCA's. The point and squirt handling & feel of H&R remains and the ride is marginally less firm. Springs are still settling but here's some photos Car at Birds with H&Rs Car with B1 springs a few days later B1 close ups - front with LCAs B1 rear Rear is settling ride height wise as arch gap was bigger when it was 1st done. BP
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11-13-2015, 07:47 AM | #3 |
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yes - the squat mean stance of H&Rs with M4 LCAs at the front did look good and drove really well. Alas it was too low for me when my work location meant a different commute not best suited to a low rider.
I'm happy with Birds B1 springs as they do everything the H&Rs did but with raised stance.
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11-23-2015, 02:42 PM | #5 |
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Bit of an update.
Before winter really takes hold, I have spent more time with my Birds B1 chassis car between comfort and sport+ than I ever did with H&Rs. I loved the low stance of and the steering feel with the H&Rs and so I was tad ho-hum about the higher stance with the B1s. The springs have settled and I'm happy with how the car sits and there steering feel and response is equal or better in sport+. The ride height increase of B1's means adaptive dampers are influencing the ride and handling more, than with H&Rs, and theres less dependency on BMWs 2nd damper system (Bumpstops to you and I). Not that H&Rs bottomed out but the contribution of adaptive damping was less with H&Rs than it is now. B1 springs (combined with B1 ARBs) keep the front keen and rear tight, irrespective of the damper mode selected. Ride in comfort is improved and in sport+ any hint of underdamping is gone as the cars responses sharpen up nicely. The traction was good before, thanks to quaife LSD but now car is more tolerant of road surface flaws and variations meaning you can be more liberal putting JB4'd power down. I've yet to take the car on a track day with this setup although toying with signing up to PH session at Goodwood 12 Dec but might have winter boots and map 2 or 4 on by then. As steering feels tauter and both traction and ride are more usable on the road, I'm spending more time in sport+. Finally, a chum has just bought a passively damped m235i so we have played with both cars back to back. I agree with C'mans comparison m135i v m235i, stock m235i rides and handles better than I recall my m135i when it was new. The tables turn with B1 springs and m4 LCAs as we both preferred the steering feel and tighter helm on my car. My chum is likely to put m4 LCAs on his car once spring has sprung next year. BP |
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11-27-2015, 02:11 PM | #7 |
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Way,
Yes. The M3/M4 Front Lower control arms with the following part numbers: Left: 31122284529 Right: 31122284530 Regulating rod 37142283867 - you just need the ball joint / nut assembly at the bottom end of regulating rod to attach to existing f2x regulating rod. BP
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11-28-2015, 07:09 AM | #8 | |
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11-29-2015, 07:21 AM | #10 |
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Should fit all models running 18" wheels but you need to check clearance of LCAs on 17" and less diameter alloy wheels
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12-01-2015, 03:13 AM | #11 | |
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12-01-2015, 03:48 AM | #12 | |
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12-01-2015, 03:54 AM | #13 | ||
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I think it's a little soft - let me explain. When you go over a sharp speed bump at any speed you get a proper thump from the suspension as it drops back down. This manifests itself at speed with a similar issue (not a full on thump like you get over the speed bump but a feeling like the car skips a bit, losing brief contact with the road) if you hit broken pavement. I think it needs to be slightly stiffer to fix this. The trade off is you get a massive amount of grip which is great for an open diff car to have... Also adding that the initial travel is excellent - and gives a real sense of security in handling |
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12-01-2015, 04:05 AM | #14 |
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I am running the regular M Sport suspension on the 116i, which I assume is slightly softer sprung. Coming from Bilstein setups of the previous cars, I find the rebound rate to be spot on, but I would prefer slightly stiffer compression. It feels like the car bottoms out too easily.
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12-01-2015, 04:29 AM | #15 | |
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12-01-2015, 06:15 AM | #16 | |
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12-01-2015, 05:18 PM | #17 | |
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That was one of the reason I chose to invest in upgrading my cars chassis. The result is an m135i's that rides, grips, steers and handles better than m235i so won't be reverting it back to standard anytime soon !
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