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10-16-2020, 12:30 AM | #23 | |
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A spherical mount is a solid bushing. So even the main lower control arm is NOT spherically mounted as it goes into a non-solid bushing where it is connected to the spindle and the subframe. The same applies for the 3 rear control arms and the trailing arm. The bushings in the control arms are not all solid - spherical/ball-joints are solidly mounted. That's why there are upgrades from SPL and GC for rear arm replacements that are actual spherical ends. The same can be said for the bushings that the main control arm and trailing arm mount to in the subframe and spindle. Those can be replaced with true solid bushings - in the same way the solid subframe bushings are commonly replaced. Last edited by tsk94; 10-16-2020 at 12:43 AM.. |
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10-16-2020, 01:13 AM | #24 | |
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It looks like all of the mounting to the subframe is via rubber bushings, but I'm not sure about the toe arm in that regard, since it has a ball joint on at least one side and photos show both sides looking identical so it may have ball joints on both sides. http://bmwfans.info/parts-catalog/E9...el_suspension/ The subframe diagram can be found there too.
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10-16-2020, 01:30 AM | #25 | |
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Regardless of the specifics, it's still an upgrade to go with the rear set of SPL or GC rear arms. More adjustability and full spherical mounts. The M3 GT4 replaced bushings in the rear arms and trailing arms but retained the stock arms. However I believe at the time this was mandated by rules - the bushings could be replaced but not the arms. Having one end a ball-joint is better then nothing, but a rubber bushing on the other end will result in flex/distortion under load. |
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10-16-2020, 01:36 AM | #26 | |
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10-16-2020, 07:49 AM | #27 | |
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The rear upper arms are a combination. Rubber on one end and spherical on the other. I believe the rubber is on the knuckle end of things. The big lower arm I believe is rubber on both ends and trailing arm is the same.
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10-16-2020, 08:09 AM | #28 | ||
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10-16-2020, 02:59 PM | #29 | |
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Rubber bushings: Camber arm (one with the spring) inboard end Upper Arm outboard end Guide rod outboard end Trailing arm both ends
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10-16-2020, 04:06 PM | #30 | ||
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-SPL rear toe links, -SPL rear upper arm links, -Bimmerworld camber arm bushings, -Bimmerworld rear trailing arm bushings, -solid rear subframe bushings & solid diff bushings Would eliminate all rubber bushings in the rear end? |
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10-16-2020, 04:16 PM | #31 | |
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Ballers on a budget have five bushings to replace then.
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E90M 6MT Slicktop Single Humper in need of a diet
Last edited by Bartledoo; 01-08-2021 at 12:29 AM.. |
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10-18-2020, 05:03 PM | #32 |
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My set up not as radical as what most of you are running but my tried and true set-up for me for track. Have monoballs up front, solid subframe bushings rear, Fall-lIne toe arms in rear, Fall-line solid camber shim kit, rest of suspension is stock (except for shocks/struts).
Front Camber -3.5 degrees Rear Camber -2.25 degrees Front toe 1/16" total toe, OUT Rear toe 1/16" total toe, IN Toe is old school with toe plates, but car tracks straight and I have everything marked so I can switch from street to track settings. This is my street car too, but I wouldn't run this set up long-term for street use with above alignment settings. |
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01-16-2021, 05:17 PM | #33 |
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Front
Camber -3.6L / -3.4R Caster +7.2L / +7.3R Toe -0.10L / -0.10R (toe OUT) Rear Camber -2.4L / -2.4R Toe +0.20L / +0.20R (toe IN) Welcome any thoughts on these #'s. Just picked car up yesterday after six months in the shop for a variety of things.
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01-16-2021, 05:34 PM | #34 | |
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Also, there are no dimensions on your toe specs.
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01-17-2021, 05:54 PM | #35 | |
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Toe specs are in degrees.
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AA Gen 2 Lvl 2 w/Meth; MagnaFlow catless x-pipe; Dinan Underdrive Pulley; VAC Coated Bearings; ARP Rod Bolts; Oil Diverter Valve; Dinan Strut Braces; Dinan Rear Toe Links; ECS Rear Trailing Arms; MCS 2-Way NR w/700F-1000R; GC Camber Plates; AKG 75D MM & 95A TM; CAE Shifter; Titan T-S5; StopTech ST60 380mm/ST40 355mm; MFactory DS; Zebulon Splitter; Zebulon 330 Rear Wing; Gutted w/Piper Motorsports Custom Cage; OMP WRC-R Seats
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01-17-2021, 10:00 PM | #36 | |
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'08 E92 M3 DCT Melbourne Red/Bamboo Beige Leather/EDC/SSP Spec-R DCT clutch discs/SSP Pro-Gold DCT Fluid/Quaife LSD/3:45 Final Drive by Diffs Online/BE Bearings & ARP Bolts/Vibra Technics Engine Mounts/M3 World HFC X-Pipe/LUX H8 180/BPM Sport DCT Tune/PFC Z-Rated Pads/ECS Brass Brake Caliper Bushings/Alex Shop Solid Sub-frame Bushings/Motul 600/Tint
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05-12-2021, 11:38 PM | #37 |
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I found this inches to degrees conversion chart when I tried my first string alignment after doing the solid rear subframe bushings DIY.
A week later I put the car on an actual alignment rack at the local Goodyear store and the conversion chart helped me understand what to tell the tech. http://bulletproofsteering.com/align...version_chart/
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07-03-2021, 10:57 AM | #38 |
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I'll be installing my front camber plates sometime in the next couple of weeks and then head back to the alignment shop to get a sense of what the toe changes are when adding and subtracting negative camber.
But here's a look at my rear tires (helpful?) from Thursday at Laguna Seca (4 right turns and 7 left turns), and my current alignment. Please chime in if you have any recommendations about adjusting the settings for the rear.
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07-03-2021, 12:54 PM | #39 | |
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07-03-2021, 04:07 PM | #40 |
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Yeah I wouldn't change anything unless you are trying to fine-tune the handling balance.
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08-12-2021, 04:19 PM | #41 |
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Lot of talk about camber but what about caster ?? I just bought Vorshlag camber/caster plate and wondering if i leave the oem caster setting (arround 7 i think) or I go to 9-10 since now I have caster adjustment.
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08-12-2021, 04:37 PM | #42 |
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08-12-2021, 05:14 PM | #43 |
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So would you recommend to max out caster adjustment before going to my alignment shop ? Also I was running arround -3 camber and ripping alot outside of the tire . Every one or two event i have to switch tire to put the inside, outside. Would you recommend going to -4 like ?
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08-12-2021, 05:18 PM | #44 | |
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-4* plus way more caster will likely have you wearing the inside of the fronts. |
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