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      06-01-2015, 10:09 AM   #23
katsooba
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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.
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      01-21-2016, 09:13 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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      01-25-2016, 04:41 AM   #27
titium
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Quote:
Originally Posted by fe1rx View Post
The Dinan upper mount uses a thinner lower part per the attached image from the Dinan website:


It appears to be a cast polyurethane part, like the Powerflex mount, but thinner.

Dinan claims that their mounts "increase shock travel by 10 mm for improved ride quality and performance". The only way they could increase shock travel by 10 mm is if the lower mount compressed to a thickness of 11.6 - 10 = 1.6 mm. Since (I am assuming they are) made from cast urethane they would need to be only about 2 mm thick to increase travel by 10 mm, and this would only be true if the OE mount itself was compressed to 2 mm in service (which is extremely improbable).

As usual, the marketing hype is overblown and vague.
Seems like the main benefit of the both comes from the much stiffer urethane bush and not the claimed increased suspension travel (in the dinan case).

So fe1rx what's the verdict powerflex or dinan mounts?
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      01-29-2016, 06:26 AM   #28
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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, 01:35 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.


Quote:
Originally Posted by titium View Post
Seems like the main benefit of the both comes from the much stiffer urethane bush and not the claimed increased suspension travel (in the dinan case).

So fe1rx what's the verdict powerflex or dinan mounts?
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      10-30-2018, 01:26 AM   #30
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Quote:
Originally Posted by fe1rx View Post
So you can see from the above that the lower shock mount is not particularly flimsy.

An interesting point that is not visually apparent because of the dust boot normally covering the top of the OE shock - the 135i rides on its rear bump stop at normal ride height. The bump stop is very soft and fairly linear in its initial stiffness, but it adds to the total spring rate at the rear and means that the rear has a progressive total rate, even with a linear spring.

Attachment 1138821

Any load going into the bump stop also loads the shock upper mount, so that thing gets a good workout. You can see how soft this upper mount is simply by jacking the suspension and watching it move. I plan on measuring the actual stiffness of this mount also, but have to make another fixture.

In contrast to the OE suspension my Ohlins suspension at ride height has about 27 mm of shock travel from ride height before the bump stop engages. This is "normal" for a performance oriented suspension, where a linear spring rate is desirable in the steady state working range of travel.

Attachment 1138822

I am planning on installing Powerflex upper mounts to stiffen up the upper mount. I will measure the actual stiffness of this configuration before I install it also.

I think the soft upper mount chosen by BMW is an inexpensive way of softening the damping under high frequency low amplitude inputs. Any large amplitude input would immediately bottom out the upper mount and bring the shock into play. With a good shock, I don't believe this gimmick is necessary.
Hello fe1rx,

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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Quote:
Originally Posted by ornicar View Post
Hello fe1rx,

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.
Based on my measurements:

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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Quote:
Originally Posted by fe1rx View Post
Based on my measurements:

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.
Hello,

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
fe1rx
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Quote:
Originally Posted by ornicar View Post
Hello,

thank you for your answer.

I finally find the P/N it is 24630-03

https://www.1addicts.com/forums/atta...7&d=1415689059
Thanks for that link. I had not seen that spare parts list before.

Shortening the bump stop seems reasonable in your case.
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