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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 04-08-2014, 12:31 AM
Seanla Seanla is offline
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Bouncy suspension - new Koni FSDs

Hi all,

I have a 2011 335i convertible with base suspension and under 34,000 miles. About 1.5 months ago I installed Koni FSDs while keeping base springs.

Although the ride is smooth, the car has excessive vertical bounce at high speeds on uneven roads and freeways. It's quite bothersome. High speed turns seem quite good. Is this bounce normal or could my Konis be bad? Or could the problem be something else such as the standard coil springs? Again keep in mind that I have less than 34,000 miles

Thanks, Sean
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  #2  
Old 04-08-2014, 02:23 AM
hondo402000 hondo402000 is offline
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I can tell you it is not the coil springs,
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  #3  
Old 04-08-2014, 06:08 AM
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David1 David1 is offline
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Get rid of the FSD's, Everyone of my friends cars that have had them we had the same bouncy feeling. You should have have gone with the Yellows.
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  #4  
Old 04-08-2014, 06:08 AM
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thekurgan thekurgan is offline
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This isn't the first time I've heard the FSDs are better at compression than rebound.
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Old 04-08-2014, 06:22 AM
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MasterYoda MasterYoda is offline
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This is why bimmerfest is so good I've been debating about getting Koni FSDs. Definitely wont be getting them now. What do you guys think about bilsteins?


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  #6  
Old 04-08-2014, 07:20 AM
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captainaudio captainaudio is offline
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This has not been my experience at all on my 2007 335i Cabrio with the sport suspension. I find that the car feels very planted and several other members here who have driven it feel the same way.

Perhaps on a car without the sport suspension the Koni FSD/Eibach Spring package would be a better solution.
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  #7  
Old 04-08-2014, 08:35 AM
fdriller9 fdriller9 is offline
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I think the FSDs are geared toward a lower spring. So maybe this is why you are experiencing bouncy-ness. Could be that there is less travel for the shock to react and under compensates.
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  #8  
Old 04-08-2014, 09:03 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Seanla View Post
Hi all,

I have a 2011 335i convertible with base suspension and under 34,000 miles. About 1.5 months ago I installed Koni FSDs while keeping base springs.

Although the ride is smooth, the car has excessive vertical bounce at high speeds on uneven roads and freeways. It's quite bothersome. High speed turns seem quite good. Is this bounce normal or could my Konis be bad? Or could the problem be something else such as the standard coil springs? Again keep in mind that I have less than 34,000 miles

Thanks, Sean

Base suspension provides softer springs - more bounce. BMW performance springs'll calm it down, big time.
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  #9  
Old 04-08-2014, 10:14 AM
anE934fun anE934fun is offline
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Quote:
Originally Posted by captainaudio View Post
This has not been my experience at all on my 2007 335i Cabrio with the sport suspension. I find that the car feels very planted and several other members here who have driven it feel the same way.

Perhaps on a car without the sport suspension the Koni FSD/Eibach Spring package would be a better solution.
What CA says. I am one of the 'other members' (with the Sport package) with FSDs and have absolutely zero complaints with the FSDs.
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Old 04-08-2014, 10:15 AM
anE934fun anE934fun is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Base suspension provides softer springs - more bounce. BMW performance springs'll calm it down, big time.
I would swap the springs before unloading the FSDs.
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  #11  
Old 04-08-2014, 01:05 PM
Seanla Seanla is offline
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Mein Auto: 2011 335i Conv base susp
Thanks all, it seems that several of you think the softer base springs are the issue with the bounciness. People above have suggested the Eibachs and BMW performance springs.

The strange thing is that even with the base springs my car seems to be riding really low. Even the shop that installed my Konis thought at first glance that the car seemed to be riding low and wondered if it was the result of the Konis. With that in mind, I'm concerned that Eibachs or some other springs will lower the ride even more.

1) Could the issue be anything else other than springs?

2) Will Eibach or BMW Performance springs stiffen the ride? I avoided getting the sports package because I didn't want a harsh ride on choppy LA roads and freeways
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  #12  
Old 04-08-2014, 01:06 PM
Seanla Seanla is offline
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Strange thing is that our family Toyota Camry LE 4 cylinder has less bounce than my car. How can the bounce be so bad?
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  #13  
Old 04-08-2014, 01:10 PM
Seanla Seanla is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Base suspension provides softer springs - more bounce. BMW performance springs'll calm it down, big time.
LA has terrible roads and the 405 and 10 freeways are horrid. Will the performance springs make the ride harder?
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  #14  
Old 04-08-2014, 01:40 PM
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thekurgan thekurgan is offline
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Quote:
Originally Posted by Seanla View Post
Strange thing is that our family Toyota Camry LE 4 cylinder has less bounce than my car. How can the bounce be so bad?
Strut/shocks mismatched to the springs, combined with a heavy vehicle.
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  #15  
Old 04-08-2014, 01:46 PM
hondo402000 hondo402000 is offline
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Quote:
Originally Posted by Seanla View Post
Thanks all, it seems that several of you think the softer base springs are the issue with the bounciness. People above have suggested the Eibachs and BMW performance springs.

The strange thing is that even with the base springs my car seems to be riding really low. Even the shop that installed my Konis thought at first glance that the car seemed to be riding low and wondered if it was the result of the Konis. With that in mind, I'm concerned that Eibachs or some other springs will lower the ride even more.

1) Could the issue be anything else other than springs?

2) Will Eibach or BMW Performance springs stiffen the ride? I avoided getting the sports package because I didn't want a harsh ride on choppy LA roads and freeways
shocks don't set the ride height, the springs do, the shock absorb the bumps in the road, stiffer shock make for a harsher ride,

if the shocks set the ride height why would you buy lowering springs, and not lowering shocks???
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  #16  
Old 04-08-2014, 03:27 PM
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captainaudio captainaudio is offline
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Bouncy suspension - new Koni FSDs

There may be another issue. It may be a good idea to have the suspension checked by a dealer or a good indy shop. I had to have some bushings replaced last year.
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Last edited by captainaudio; 04-08-2014 at 03:52 PM.
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  #17  
Old 04-08-2014, 09:20 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Seanla View Post
LA has terrible roads and the 405 and 10 freeways are horrid. Will the performance springs make the ride harder?

They'll make it firmer, but FSD's should take the shock outta holes & bumps.

Contact Koni! Ask about spring rates & FSD's you purchased.
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  #18  
Old 04-09-2014, 12:33 PM
Spagolli94 Spagolli94 is offline
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I have sport suspension and Koni FSD on my car. No bounce. Feels more planted and firm than stock shocks, but impacts are less harsh.
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  #19  
Old 04-09-2014, 01:33 PM
Seanla Seanla is offline
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Thanks everyone.

BTW, do you know whether adding non-BMW shocks voids my manufacturer's warranty on the suspension pieces?
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  #20  
Old 04-09-2014, 03:28 PM
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captainaudio captainaudio is offline
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Quote:
Originally Posted by Seanla View Post
Thanks everyone.

BTW, do you know whether adding non-BMW shocks voids my manufacturer's warranty on the suspension pieces?
It had no effect on mine. I had bushings replaced under warranty and the dealer (BMW Manhattan which is owned by BMW North America) had no issue with the fact that I had replaced the RFTs and installed Koni FSDs.
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  #21  
Old 04-09-2014, 06:26 PM
Seanla Seanla is offline
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It had no effect on mine. I had bushings replaced under warranty and the dealer (BMW Manhattan which is owned by BMW North America) had no issue with the fact that I had replaced the RFTs and installed Koni FSDs.
Captain Audio, is that Manhattan New York or Manhattan Beach, CA?
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Old 04-09-2014, 06:29 PM
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captainaudio captainaudio is offline
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Captain Audio, is that Manhattan New York or Manhattan Beach, CA?
Manhattan, New York



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Old 04-09-2014, 07:09 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Seanla View Post
The strange thing is that even with the base springs my car seems to be riding really low.

CHECK YOUR RIDE HEIGHT

Ride height is measured from the top of the wheel well fender flange to the bottom of the wheel rim.

Front Stock Values:

16" wheel -- 22.99 in -- 584 mm
17" wheel -- 23.58 in -- 599 mm
18" wheel -- 24.09 in -- 612 mm
19" wheel -- 24.60 in -- 625 mm

Rear Stock Values:

16" wheel -- 22.24 in -- 565 mm
17" wheel -- 22.83 in -- 580 mm
18" wheel -- 23.35 in -- 593 mm
19" wheel -- 23.82 in -- 605 mm
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  #24  
Old 04-21-2014, 12:47 PM
Seanla Seanla is offline
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Quote:
Originally Posted by CALWATERBOY View Post
CHECK YOUR RIDE HEIGHT

Ride height is measured from the top of the wheel well fender flange to the bottom of the wheel rim.

Front Stock Values:

16" wheel -- 22.99 in -- 584 mm
17" wheel -- 23.58 in -- 599 mm
18" wheel -- 24.09 in -- 612 mm
19" wheel -- 24.60 in -- 625 mm

Rear Stock Values:

16" wheel -- 22.24 in -- 565 mm
17" wheel -- 22.83 in -- 580 mm
18" wheel -- 23.35 in -- 593 mm
19" wheel -- 23.82 in -- 605 mm
Thanks. I'll measure it.
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