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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Changing suspension again - FSD/Eibach. Upgrade bump stops?



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      09-29-2010, 04:06 PM   #1
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Changing suspension again - FSD/Eibach. Upgrade bump stops?

So I'm changing from the ST coilovers after only a week of use, they're still too firm for Seattle streets (at least on 19"s). I'm going the conservative route this time with Koni FSD shocks and Eibach pro kit springs. Based on my previous experience with the H&R sport springs over OEM sport shocks, I'd like to change to a shorter bump stop in the front. When I was on the H&R springs, there was so little suspension travel from the drop that the bump stop was always engaged until I trimmed it down to only about 1.25" remaining. The Eibach spring is a similar drop and I'm concerned I may encounter the same issue. FWIW, Eibach says no trimming is required in the front (however they recommend trimming 1" in the back).

Is there any harm in proactively changing to a shorter bump stop in the front with the Eibach/FSD combo? I'm thinking of changing to the E36 Z3M bump stop, part # 31332225377. It looks about .5" shorter than the OEM 335 bump stop. I know that user subieworx changed to these with good results. But can anyone else with Eibach/FSDs comment on whether I need to change bump stops? I've searched and there's not much out there.

Here's the OEM 335 vs Z3M bump stop picture from subieworx's post:
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      09-30-2010, 02:27 PM   #2
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Come on, I know at least some people have changed their bump stops when lowering. What's worked?

Anyone tried E90 M3 bump stops on their lowered 335i? These look like they may be even at bit shorter than the E36 M3/Z3M.
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      10-01-2010, 03:14 AM   #3
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GO for the Z3M bump stops, they are shorter than the E90 M3

E90M3 people with short springs go with the Z3M stops to increase suspension travel
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      10-01-2010, 10:51 AM   #4
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Thanks for the reply. I ended up going with the E36 M3/Z3M bump stops.
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      10-01-2010, 01:49 PM   #5
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Quote:
Originally Posted by 3times3 View Post
Thanks for the reply. I ended up going with the E36 M3/Z3M bump stops.
how does she feel now, noticably better?

Yves
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      10-02-2010, 01:33 AM   #6
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Go with the e36 m3 bumpstops. It's what dinan puts in their setup which very similar to the eibach/ fsd
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      10-02-2010, 01:54 PM   #7
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Yves, just ordered all the parts so I wont have them installed until next week. Will post a review as soon as i have it done and aligned.

I called Dinan and spoke to a tech there who was very friendly and agreed that E36 M3 bump stops are the way to go for this conservative drop.
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      10-03-2010, 01:36 PM   #8
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Quote:
Originally Posted by 3times3 View Post
Yves, just ordered all the parts so I wont have them installed until next week. Will post a review as soon as i have it done and aligned.

I called Dinan and spoke to a tech there who was very friendly and agreed that E36 M3 bump stops are the way to go for this conservative drop.
Thanks 3times3, look forward to hearing your assessment of the difference this makes.

Cheers

Yves
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      10-04-2010, 02:31 AM   #9
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what's good advantage for increase suspension travel?
I have koni fsd/eibach and interested in this setup...
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      12-16-2010, 06:17 PM   #10
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Did you do this? How did the new bumpstop workout? Do you need one for each side? How's the ride with your FSD and Prokit?

Thanks,

Sachin
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      12-17-2010, 02:32 PM   #11
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Yes, pls do tell. Pics if possible.
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      01-13-2011, 10:36 PM   #12
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pics and review please? This is probably the EXACT set up I am going to run.
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      01-14-2011, 01:48 AM   #13
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if you guys want a better ride buy a new car, my previous car was a five series and at the time i thought it was the best handling car ive ever owned. im so sick of women bitching about ride quality
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      01-14-2011, 01:51 AM   #14
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seriously you **** are bitching about koni fsd's and the pro kit. thats no different then the sport package. go buy a five series and leave everyone alone.
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      01-14-2011, 02:08 AM   #15
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and hey 3times3 after reading this post months ago i called eibach and they said not to trim any of the bump stops so i guess we talked to two different people.
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      01-14-2011, 02:11 AM   #16
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Quote:
Originally Posted by Hellrot Sachin View Post
Did you do this? How did the new bumpstop workout? Do you need one for each side? How's the ride with your FSD and Prokit?

Thanks,

Sachin
no put a short bump stop on one side and a longer one on the other, it rides better then stock.
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      01-14-2011, 07:21 PM   #17
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Quote:
Originally Posted by brocklanders View Post
no put a short bump stop on one side and a longer one on the other, it rides better then stock.
+1
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      01-14-2011, 09:33 PM   #18
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Quote:
Originally Posted by brocklanders View Post
no put a short bump stop on one side and a longer one on the other, it rides better then stock.
This is so vague I don't understand what you mean.
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      01-18-2011, 06:40 PM   #19
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Remember that the bump stop is there to give you a controlled bottoming of the suspension as well as preventing any internal damage of your dampers. You need to make sure the bump stop you use is of the correct length and progressive, so you don't get a sudden bottoming and lose traction.

Use bump stops, you need them. With the correct bump stop(shorter is not better) and proper spring rates(higher is not better), you will have more mechanical grip and more cornering power.
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      01-18-2011, 08:09 PM   #20
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Quote:
Originally Posted by HP Autowerks View Post
Remember that the bump stop is there to give you a controlled bottoming of the suspension as well as preventing any internal damage of your dampers. You need to make sure the bump stop you use is of the correct length and progressive, so you don't get a sudden bottoming and lose traction.

Use bump stops, you need them. With the correct bump stop(shorter is not better) and proper spring rates(higher is not better), you will have more mechanical grip and more cornering power.
So would I benefit from a different bump stop in conjunction with an H&R Sports and Koni Yellow set-up?
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      01-18-2011, 11:48 PM   #21
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Quote:
Originally Posted by twinship View Post
So would I benefit from a different bump stop in conjunction with an H&R Sports and Koni Yellow set-up?
If you are changing your springs and struts/dampers, you will get a firmer ride than stock, but a better controlled ride. However, H&R's lowers the car a bit too much for my taste and reduces compression travel. Slightly shorter bump stops can be used to gain a bit of compression travel, but you must do some testing to make sure you will not damage the struts/dampers with shorter than supplied/recommended bump stops. You will also void the warranty of the struts/dampers by installing shorter bump stops.
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      03-25-2011, 05:01 PM   #22
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Regarding the e36 bump stop, does anyone know if there is a big difference in its overall height when under compression vs the stock e9x one? My concern is if I get the e36 bump stops there's a chance it could compress over a large bump to the point that I rub. Also being a suspension n00b do you only need these for the front or rear as well?

Thanks
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