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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > monoball set up
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      12-05-2021, 01:20 AM   #23
biomed27
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Quote:
Originally Posted by kilogram View Post
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Originally Posted by johnung View Post
Actually the engineering explanation that I've heard on monoballs is that their ability to move in almost all directions is what prevents them from transmitting NVH to the chassis. If you think about it, hard race bushings are the opposite of monoballs. They are stiff in all directions and are known for transmitting a ton of added NVH to the chassis.
I don't think that's a correct engineering explanation. The DoF the monoballs allow prevents binding in the suspension, but they absolutely transmit more impulse force directly to the chassis.

With rubber bushings, some of the impulse from suspension motion is consumed in deforming the bushing. This is part of rubber's natural damping properties, and as such some of the kinetic energy from the suspension impulse is dissipated. There is very little deformation in a spherical bearing (only the PTFE liner) to dissipate kinetic energy.

As an experimant, try hitting a piece of rubber with a hammer, then a piece of steel with a film of PTFE on it and see which one transmits more vibration and noise to the surface below.

The monoball is substantially stiffer than a rubber bushing in the direction it matters- the direction it's most heavily loaded. The suspension arm there is a two-force member, and although the bushing allows it to transmit limited moments, the moments involved pale in comparison to the designed load path.

Monoballs are most definitely higher NVH than rubber bushings. If they weren't, BMW would have used them there from the factory. And in the control arm chassis pickup as well. The monoballs used here are an existing part from the rear suspension, and it's cheaper to design the suspension to use existing OTS parts than to design it with a bespoke bushing.
This makes absolute sense from an engineering perspective. More reviews in the VAC set up would be useful.
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      12-09-2021, 09:11 PM   #24
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Quote:
Originally Posted by kilogram View Post
I don't think that's a correct engineering explanation. The DoF the monoballs allow prevents binding in the suspension, but they absolutely transmit more impulse force directly to the chassis.
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Originally Posted by kilogram View Post
Monoballs are most definitely higher NVH than rubber bushings. If they weren't, BMW would have used them there from the factory.
^^^ 100% ^^^

Definitely upped the NVH on my setup. The trade off is worth it to me.
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      12-14-2021, 10:24 PM   #25
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I have the VAC monoballs, both upper and lower, on my 340i. All I can say is on well paved roads, its amazing… on shitty roads, it can be annoying. Do you live in a big city or outside? I'd say it really just depends what kind of roads you're driving on often.
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      12-15-2021, 06:58 AM   #26
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Originally Posted by AllaVodka View Post
I have the VAC monoballs, both upper and lower, on my 340i. All I can say is on well paved roads, its amazing… on shitty roads, it can be annoying. Do you live in a big city or outside? I'd say it really just depends what kind of roads you're driving on often.
Annoying how? Thank you for reaching out
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      12-28-2021, 01:48 PM   #27
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Has anyone installed the monoball bushings and got DSC light blinking during a long sweeping corner? I thought it was the alignment issue but it wasnít. I still got DSC light blinking. I also didnít drive fast enough to get any wheel slip or losing the control. Quite surprising to me how I got this issue and I still couldnít figure it out.

Anyone experienced the same thing?

Thanks!
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      12-30-2021, 05:35 PM   #28
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Quote:
Originally Posted by Happy Odie View Post
Has anyone installed the monoball bushings and got DSC light blinking during a long sweeping corner? I thought it was the alignment issue but it wasn’t. I still got DSC light blinking. I also didn’t drive fast enough to get any wheel slip or losing the control. Quite surprising to me how I got this issue and I still couldn’t figure it out.

Anyone experienced the same thing?

Thanks!
No, that doesn't sound right. If this just started after you installed these new parts then I would get the car up on jacks and see if anything is obviously out of place. Maybe a sensor was knocked loose or not reattached during the install? These control arms are dumb mechanical parts. They don't talk to the vehicle systems nor should they be causing wheel slip.
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      01-07-2022, 02:00 PM   #29
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Originally Posted by johnung View Post
You won't get any added noise, vibration or harshness from the VAC Monoball thrust arms. But as Alohasurftoad alluded to- the driver will get enhanced road feel transmitted to his hands through the steering wheel. Basically it feels the way that a sports sedan should!
After researching the alternatives, I just ordered VAC monoball UCA and LCA for my 2014 328i RWD. Thank you for the information you've provided on this thread and others about this product. It really helped me make the decision to go with VAC.

I've got an m-sport the DHP package that includes adaptive suspension. I've also got Dinan Shockware. It will be interesting to see how the ride quality and NVH changes with this product given my setup.

I've got a great indie that I use. Any idea what the cost of installation I should expect?

Last edited by sygazelle; 01-07-2022 at 03:11 PM..
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      01-07-2022, 03:26 PM   #30
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Quote:
Originally Posted by sygazelle View Post
Quote:
Originally Posted by johnung View Post
You won't get any added noise, vibration or harshness from the VAC Monoball thrust arms. But as Alohasurftoad alluded to- the driver will get enhanced road feel transmitted to his hands through the steering wheel. Basically it feels the way that a sports sedan should!
After researching the alternatives, I just ordered VAC monoball UCA and LCA for my 2014 328i RWD. Thank you for the information you've provided on this thread and others about this product. It really helped me make the decision to go with VAC.

I've got an m-sport the DHP package that includes adaptive suspension. I've also got Dinan Shockware. It will be interesting to see how the ride quality and NVH changes with this product given my setup.

I've got a great indie that I use. Any idea what the cost of installation I should expect?
They'll probably charge minimum 2 hours/ maximum 3 hours labor. The control arms should come with nuts on the ball joints. I bought a new nut and bolt for the other end where the monoball bushing mounts to the car and gave them to my local Indy shop. It's a good idea to get a full alignment afterwards too. You may get a cost break on the alignment if the same shop is installing them.

Please post back to let us know your impressions. Photo below of a good test track to try them out. Just mash the gas pedal and go! 😀
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      01-07-2022, 03:38 PM   #31
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Quote:
Originally Posted by johnung View Post
They'll probably charge minimum 2 hours/ maximum 3 hours labor. The control arms should come with nuts on the ball joints. I bought a new nut and bolt for the other end where the monoball bushing mounts to the car and gave them to my local Indy shop. It's a good idea to get a full alignment afterwards too. You may get a cost break on the alignment if the same shop is installing them.

Please post back to let us know your impressions. Photo below of a good test track to try them out. Just mash the gas pedal and go! 😀
Thanks for the advice. I will definitely post once I have them installed. I have been driving BMWs non-stop since '88 and while I love the newer models, I really miss the steering feel of the hydraulic systems. I'm totally used to my 3er as is, but when I learned from you and others that monoballs can get some of that feel back, I just simply had to do it.

I'll write up my experience and share a photo of my ride down Lombard St.!
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      01-07-2022, 09:32 PM   #32
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Quote:
Originally Posted by sygazelle View Post
Quote:
Originally Posted by johnung View Post
They'll probably charge minimum 2 hours/ maximum 3 hours labor. The control arms should come with nuts on the ball joints. I bought a new nut and bolt for the other end where the monoball bushing mounts to the car and gave them to my local Indy shop. It's a good idea to get a full alignment afterwards too. You may get a cost break on the alignment if the same shop is installing them.

Please post back to let us know your impressions. Photo below of a good test track to try them out. Just mash the gas pedal and go! 😀
Thanks for the advice. I will definitely post once I have them installed. I have been driving BMWs non-stop since '88 and while I love the newer models, I really miss the steering feel of the hydraulic systems. I'm totally used to my 3er as is, but when I learned from you and others that monoballs can get some of that feel back, I just simply had to do it.

I'll write up my experience and share a photo of my ride down Lombard St.!
So many owners of earlier BMWs talk about how awesome the steering was. Another mod that improves the steering on the F30 chassis is a high quality front strut brace.

When the car first turns into a curve, there's some chassis flex that's not always perceptible but it causes a slight delay in steering responsiveness. The strut brace mounts across the top of the shock towers. By eliminating that flex it makes the steering actually feel quicker, more responsive.

This is my favorite German made strut brace. It's high quality and installs in minutes. The crossbar removes in a minute to service the engine. The bolts that hold on the tower brackets are stretch bolts that are not supposed to be constantly removed and reinstalled. So this design eliminates that issue.



https://www.kiesmotorsports.com/prod...8;_ss=r?aff=22
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