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      06-01-2015, 11:09 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, 01:05 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, 01:44 PM   #25
MDMA 135i
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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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Last edited by MDMA 135i; 07-27-2015 at 02:37 AM.
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      01-21-2016, 10:13 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, 05:41 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, 07:26 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, 02:35 PM   #29
fe1rx
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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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