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06-01-2015, 10:09 AM | #23 |
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@fe1rx , why did you decide on the yellow powerflex mounts and no the black?
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06-01-2015, 12:05 PM | #24 |
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fe1rx, I have some Bilstein B8 Rear shocks available if you have some time and would like to tear those apart and analyze. Thank you for all your work in this community sir.
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07-26-2015, 12:44 PM | #25 |
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Ferix what you think about this polyurethane 90sha rear lower shock mounts in combination with polyurethane 90sha upper mount? Whether to buy new OE lower shock mount or upgrade for this one? My setup will be st xta(springs 70/103 N/mm)+m3 rear subframe bushings.
Last edited by MDMA 135i; 07-27-2015 at 01:37 AM.. |
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01-21-2016, 08:13 AM | #26 |
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Excellent information (as always) in your posts. Always appreciate the science behind the findings. Keep up the great work!
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2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
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01-25-2016, 03:41 AM | #27 | |
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So fe1rx what's the verdict powerflex or dinan mounts? |
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01-29-2016, 05:26 AM | #28 |
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Drives: BMW 120d e82 M Sportpaket
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Really appreciated the Powerflex Black upper mounts for the rar shocks (I have the ST XTA coilovers kit).
Anyway, MDMA 135i , where did you find this lower mounts? Really interested in them!
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01-29-2016, 12:35 PM | #29 |
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Racecar Vehicle Dynamics by Milliken & Milliken (truly great book) describes the function of a soft mount in series with a damper. The technical name for these things is a "relaxation spring", although a Google search won't find you any info on them. In short, they reduce high frequency harshness at some minor expense of wheel control, provided they are appropriately designed. By eliminating the soft OE shock top mount we are accepting a bit more harshness for some potential benefit. I suspect all the urethane upper mounts are functionally equivalent, give or take some nit picking.
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10-30-2018, 01:26 AM | #30 | |
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Can you please tell me the length of the Ohlins Bump Stop and his P/N? Thank you for your help and your science! BR. |
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10-31-2018, 11:52 AM | #31 | |
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ID = 14 mm OD = 46 mm Height = 52 mm Unfortunately the installation instructions do not list the part number so you would have to contact Ohlins for that. The kit I used was BMS M100. |
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11-02-2018, 08:42 AM | #32 | |
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thank you for your answer. I finally find the P/N it is 24630-03 https://www.1addicts.com/forums/atta...7&d=1415689059 Sadly is it difficult to buy it in France, so i decided to customize and cut my M-performance Bumpstop to 46mm of length. I now have ~29mm (75-46) of shock travel from ride height (75mm) before bump stop engage. Is is really better now; really less harsh. more compliant & smooth. my setup is Bilstein B8 + Bmw Performance Springs & swaybar, Front 1M LCA, Rear 1M subframe bushings. Now that the rear axle feel really nice, the Front axle is a little harsh, i ask myself if it is a good idea to swap the front performance sway bar by the original M-sport now that my performance front springs are stiffer than before (M Sport). What do you think about it? Thank you! |
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11-02-2018, 03:50 PM | #33 | |
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Shortening the bump stop seems reasonable in your case. |
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11-19-2018, 06:22 AM | #34 |
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when cutting the bomp stops cut 2 indents on the top part as the OEM
if not the bump stops will pump air in the shock and ruin it OEM did it on purpose https://www.e90post.com/forums/attac...5&d=1321662229 |
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11-20-2018, 09:16 AM | #35 | |
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in fact i am lucky because i kept the high and the lower part of the bumpstop. I cut a slice in the middle . See photo attached. |
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01-21-2019, 10:39 PM | #37 |
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Rear suspension issue
Hey
I have a 2010 135i Convertible with about 30k miles. My rear tires wear out prematurely. The passenger side rear tires wear out on the inside of the tire within a few thousand miles and the drivers rear wears almost as quickly. I've had wheel alignments but no improvement. I'm using the stock Bridgestone tires. Wondering what is wrong and how to repair. Thanks Henry |
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01-01-2020, 06:37 PM | #38 |
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Great Info!
Have you looked into solid upper or lower mounts like Turner Motorsport Spherical Rear Upper Shock Mounts - E9x E8x non-M ? https://www.turnermotorsport.com/p-5...-shock-mounts/
or Turner Monoball Race Lower Rear Shock Mount - Pair - E88, E82, E9X?https://www.turnermotorsport.com/p-5...r-shock-mount/ Would be interesting to know some science instead of just the marketing hype available. Thanks for all the great info and compelling threads. |
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02-08-2021, 09:01 PM | #39 |
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I have had the opportunity to cut apart the OE lower shock mount, just to see how it is constructed.
Lateral Section: Longitudinal Section: The design is fail safe, as it can't come completely apart, even if the rubber delaminates. |
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