|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
New Suspension Setup! Koni Sport Shocks and B&G S2 Sport Springs
|
|
05-08-2012, 12:48 PM | #23 |
Second Lieutenant
22
Rep 221
Posts |
Well he got the eibach springs right? and they have them specifically for the XIs and are rated for a drop of 1". My Springs are B&G S2 Sport springs. They don't make them for the XIs, only for the I and are rated for a drop of 1.6" in the front and 1.4" in the rear. Could that be the difference?..XI springs vs I springs?
Only reason why I got those was I didnt want the huge drop that the B&G race springs would give yet I didn't want to be stage coaching either after putting forth the effort of removing and replacing the suspension. And I believe there are XI guys out there running on I springs...
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
Appreciate
0
|
05-08-2012, 01:14 PM | #24 | |
Colonel
226
Rep 2,387
Posts |
Quote:
This assumes everything was done right by everyone. What I meant by not letting it settle, to be clear, was when you lower a car off of jacks and do not roll it back and forth some, the suspension is not settled to actual ride height. If for example he just let it off the jacks, and measured then, it would seem high. I am not saying he did that but if he did it would explain some of this. |
|
Appreciate
0
|
05-08-2012, 01:18 PM | #25 | |
Second Lieutenant
22
Rep 221
Posts |
Quote:
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
|
Appreciate
0
|
05-08-2012, 01:31 PM | #26 | |
Chief Executive
300
Rep 2,886
Posts
Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston
|
Quote:
|
|
Appreciate
0
|
05-08-2012, 01:39 PM | #27 |
Second Lieutenant
22
Rep 221
Posts |
Youre right, Eibach only offers them for the 328i but non the less the drop is 1.0 front, 0.8" rear.
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
Appreciate
0
|
05-08-2012, 02:27 PM | #28 |
Second Lieutenant
13
Rep 233
Posts |
|
Appreciate
0
|
05-08-2012, 06:38 PM | #29 |
First Lieutenant
36
Rep 311
Posts |
I was confused when i read that your front bumpstops were fine. I had installed my new springs and struts and dropped her down, it looked horible and i measured the gap and it dropped her only a small amount, .25". I then moved to the rear and swapped out the rear shocks.
As i was buttoning everything up, i thought about why my car was still near stock. I opened up the car door, stood on the sill and tried to rock her from side to side, i had no suspension travel in the front. I then measured the distance from the purch to the bottom of the spring and compared them to the original strut, i got the same measurements, thinking the struts weren't fully seated. I then checked the part numbers of the springs and struts to make sure I didn't have a wrong part. I checked to make sure the springs were installed correctly and the end of the spring was lined up with the rubber. Everything checked out but no drop. I hated the way she lookes, ass end down and the front all high in the air mocking all my hard work! I then took the flashlight and looked at the bumpstops and they were fully compressed. At that point i went inside and ate lunch. I did some searching around here on the forum and found others running into the same problem and they had cut the bumpstops or used lower bumstops. I didn't want to start cutting something and found out that i messed it up and would need to order more parts and wait some more. I didn't find much but I found a guy saying his mechanic installed the springs and he had to cut the bumpstops and noted it was a standard thing when installing lowering springs to adjust the suspension travel. I convinced myself that was the issue and I went out to finish the job. My bumpstop was flat on the portion near the top hat as the ones i saw on the 335i had a little notch cutout on the top. Mine also had a rubber black ring unlike the ones i saw as well. It had three sections, the first had the rubber donut, a second nub, and then the last portion. When i looked at your post i noticed you had a 328xi, so i thought maybe bmw uses different ones between the two. I looked online for new ones and couldn't find one that matched my exact bumpstop. I ended up cutting the first two nubs off which was about 2 inches. Logic was, the bumpstop is compressed currently, i should get another 1" drop, plus I need some suspension travel, so 2" sounded like a good number. I only left the top portion which itself was a 1" to 1.5". After I cut both sides and dropped it back to the ground, it was 25.5" from the wheel well to the ground. I looked underneath again to see where everything was sitting and i had about 1-1.5 inches of possible suspension travel before i hit the bumpstop. A week later and a couple hundred miles, its settled at 25.25" I even made sure the lower spring purch on the strut was fully seated before installing the springs with a few taps of a hammer. The things i dont understand, if the eibach springs rely on the bumpstop in the design, my car should be sitting lower with the bumpstops being cut since they arn't contacting and getting any help. If they designed it to have the additional resistance further in the spring compression, when i hit a bump, this means my struts are working overtime. Maybe thats why they can say that eibach can be ran with the OEM strut, the bumpstop limits the force the struts takes up. Since I didn't go with OEM, i should be fine i guess. Still doesn't make sense to me. Maybe my situation was a fluke and quality control got a batch of the wrong bumpstops. All in all, my car is lowered, suspension feels solid and the car is nimble as hell, all smiles here! Last edited by critical05; 05-08-2012 at 07:13 PM.. |
Appreciate
0
|
05-09-2012, 07:03 AM | #30 | |
Second Lieutenant
22
Rep 221
Posts |
Quote:
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
|
Appreciate
0
|
05-09-2012, 07:26 AM | #31 | |
Colonel
226
Rep 2,387
Posts |
Quote:
By this I mean when you jack up one end of an independent suspension car (both wheels off the ground on one end, front or back), the susp. sags, and the bottom edge of both tires move in towards the center line (quite a bit actually), top edge moves out. Then when you let it back down the bottom of the tires are too close together, and the car sits very high. Just rolling the car a few feet back and forth lets it settle, ideally you'd drive it around the block or something. Anyway this is the only think I can think of. Obviously does not happen on a solid axle. More pronounced on a McPherson strut front end as the control arms are shorter (+not a wishbone/5-link so camber changes more so tire edge moves in more) vs rear end that has very long control arms. |
|
Appreciate
0
|
05-09-2012, 07:32 AM | #32 |
First Lieutenant
36
Rep 311
Posts |
i'm assuming there has to be some differences between the 328 vs the 335. There are separate part numbers for them from eibach which would mean they had to have different spring rates or overall spring height.
For eibach they have one part number (2092.140) for the e90/e92 335i (kit i have). This should get 1.4 front, 1 rear drop. For 328i, there are separate part numbers for e90 (2085.140) and e92(2091.140). Just using what i found out on eibach, assume things are the same for the other springs out there. Last edited by critical05; 05-09-2012 at 07:37 AM.. |
Appreciate
0
|
05-09-2012, 07:49 AM | #33 |
Second Lieutenant
22
Rep 221
Posts |
what part# for Koni are you running? Becasue if that matches what I'm running the only variables would be the model car (335 vs 328) and the springs. Possibly the install as well..
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
Appreciate
0
|
05-09-2012, 02:26 PM | #35 |
Second Lieutenant
22
Rep 221
Posts |
So like me, you didn't have any problems with the install right?..lke cutting down the bumpstop or anything...
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
Appreciate
0
|
05-09-2012, 02:32 PM | #36 |
Major
22
Rep 1,083
Posts
Drives: 2021 M2C 6MT
Join Date: Jun 2007
Location: Chicagoland
iTrader: (4)
Garage List My garage spot [0.00]
07/07 BMW 335xi [8.50] 2001 Honda CBR600F4i [0.00] 2007 Husqvarna SM610 [0.00] 2004 Chevy Tahoe Z71 [0.00] 2005 Harley Davidso ... [0.00] 2007.9 335xi [6.50] |
Threads like this make me never want to mess with my suspension.
__________________
2021 BMW M2 Competition, BSM, Exec Pkg, 6MT
GONE:07/07 E90 335xi SG Black Dakota|Alum|ZSP|2AB|ZPP|ZCW|Nav|CA|6FL|PDC| Blacklines|3M Summers: 235/40/18 265/35/18 Hankook Ventus V12 on VMR 701s A/S: 225/40/18 255/35/18 Pirelli PZero Nero M+S on OEM 162s |
Appreciate
0
|
05-09-2012, 04:15 PM | #37 |
Private First Class
13
Rep 166
Posts |
|
Appreciate
0
|
05-09-2012, 06:08 PM | #38 |
First Lieutenant
36
Rep 311
Posts |
Koni's for the front are 8741 1535 l/r sport, fits all 3 series xi models.
Besides the extra time diagnosing the bump stops, the install was surprisingly easy. Its more of a mental thing. After this experience, I would rather do struts and springs on the bmw than replace a serpintine belt on an Audi. You have to remove the entire front end and push out the radiator support to get an extra 3" to get to the belt. I had to do mine earlier this year on my old S4 cabrio. All said and done, I haven't looked back besides sharing my experience. Well worth the time and effort for the results, both looks and handling. I felt the car had way too much power for the suspension. Missed shifts due to nose lift as well as front wheel scratch during heavy trottle. Just because you have an awd car doesn't mean you need all that extra ground clearance. Last edited by critical05; 09-09-2012 at 09:39 AM.. |
Appreciate
0
|
05-10-2012, 07:59 AM | #39 | |
Second Lieutenant
22
Rep 221
Posts |
Quote:
__________________
2008 e92 328Xi - Daily Driver
M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36 |
|
Appreciate
0
|
05-10-2012, 08:55 AM | #40 |
Colonel
226
Rep 2,387
Posts |
So the mystery is not solved regarding trimming bump stops or not. I am going to do the koni yellow/eibach pro kit later this summer. For a 335xi coupe. I'll get some e36 M3 & Z4 bump stops just in case, and do some measuring prior to disassembling everything...
|
Appreciate
0
|
05-10-2012, 09:41 AM | #41 |
Chief Executive
300
Rep 2,886
Posts
Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston
|
|
Appreciate
0
|
05-13-2012, 10:54 PM | #42 |
***** noob
1369
Rep 10,479
Posts
Drives: 325xi>M235i>428GCx Mspor
Join Date: Sep 2005
Location: Boston
|
no pics?
__________________
2006 325xi (Sold)
2014 M235I (Current) 2015 428xi Gran Coupe (STB) |
Appreciate
0
|
05-23-2012, 10:04 AM | #43 |
Private First Class
7
Rep 180
Posts |
Installing eibach springs and koni yellows on my 335xi, so is it agreed that it is required to trim the bump stops in order for the suspension to function properly ?
|
Appreciate
0
|
05-24-2012, 02:41 PM | #44 |
Master of Ceremonies
1
Rep 111
Posts |
Bumpstops do not affect ride height. Springs determine ride height.
Cutting bumpstops allows for an additional inch or so of travel near the bottom of the damper's stroke. This is a benefit for lowered cars, since they have reduced shock travel lengths compared to stock. Cutting, or even omitting, bumpstops will not change how a car sits. Bumpstops prevent shocks from being damaged from being bottomed out. Bumpstops do not change the behavior of a suspension system. They are a rubber buffer to prevent metal to metal contact within the damper. |
Appreciate
0
|
Bookmarks |
|
|