04-07-2020, 06:52 PM | #1 |
Bmw Inside
50
Rep 210
Posts |
Does anyone happen to know the rate of the springs want to buy them when this quarantine is over and I'm back to work but want to make sure I buy the correct ones. Also if anyone has any recommendations on any others that sounds great not sure if anyone has any experience with them and hate them.
|
04-07-2020, 07:54 PM | #2 |
Brigadier General
4016
Rep 3,539
Posts
Drives: 328d Wagon, M2 Comp, i4 eD35
Join Date: Sep 2016
Location: Bay Area, CA
|
399lbs/in front, 565lbs/in rear. The front spring is too stiff for the rear spring included IMO. The F32 M-perf kit has the same rear spring kit, but much lower front spring rate.
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations. |
Appreciate
0
|
04-08-2020, 10:36 AM | #5 | |
Brigadier General
4016
Rep 3,539
Posts
Drives: 328d Wagon, M2 Comp, i4 eD35
Join Date: Sep 2016
Location: Bay Area, CA
|
Quote:
The front is too stiff IMO because it removes flat ride, where the front frequency is lower than the rear to promote stability and fast settling of the chassis. Frequency is a function of weight and spring rate.
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations. |
|
Appreciate
0
|
04-08-2020, 12:37 PM | #6 | |
Brigadier General
1599
Rep 3,748
Posts |
Quote:
|
|
Appreciate
0
|
04-08-2020, 01:11 PM | #7 |
Bmw Inside
50
Rep 210
Posts |
Not sure how everyone else does it but my friend has a spring rate of 16k on his bc coilovers got to drive it yesterday and I loved them was hoping bilstein would do the same with measurement but I dont see a spring rate any where.
|
Appreciate
0
|
04-08-2020, 01:28 PM | #8 |
Major General
6407
Rep 8,495
Posts |
Suspension characteristics, including ride and handling, are very subjective. It's a minefield of manufacturers, specifications, prices and opinions. Thorough research is required if you want to get it 'right'.
My car is running Ohlins Road & Track : Ohlins customers 90nN/mm springs on the front (Ohlins R&T 'standard' springs are 70N) and 160N/mm on the rear. Some people may find the ride to be too firm. That said, my wife (who drives a very softly sprung KIA Sorento) doesn't mention it. For me the spring rates (and the damping) are excellent, but I do track my car several times each year and it's been modified as a fast road / occasional track setup. From experience if you want decent suspension changing the dampers is a must, not just springs.
__________________
Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
|
Appreciate
2
cfm56d7b5886.00 1bad14-F3030.50 |
04-08-2020, 03:14 PM | #10 |
Captain
480
Rep 681
Posts |
You'll def feel more of the road with b14s. You'll also have plenty of bump steer and a "sporty" ride aka choppy and stiff. If your baseline are BCs with 16k springs, then bilsteins will prob be better than that.
Bilsteins are also monotube dampers and have a really high gas pressure. They're stiff and designed to be stiff. I ran KWs and now Bilstein on my car. The only reason I'm still running Bilsteins is because they're a donor set for my custom tuned dampers. I'm running different springs which I'll have the dampers tuned for.
__________________
2016 328ix F31 - SOLD!
2006 997.1 C4S |
Appreciate
1
DLag30103.50 |
04-08-2020, 03:24 PM | #11 | |
Bmw Inside
50
Rep 210
Posts |
Quote:
Sounds good to me I think that probably sealed the deal. |
|
Appreciate
0
|
04-08-2020, 05:01 PM | #12 |
Brigadier General
4016
Rep 3,539
Posts
Drives: 328d Wagon, M2 Comp, i4 eD35
Join Date: Sep 2016
Location: Bay Area, CA
|
This is going to depend on weight of the vehicle. For my F31, F8x ZCP front springs and stiffer (210lbs/in+) look pretty decent with the B6/8 fronts. For the B6/8 rears I would need something in excess of 1000lbs/in to bring the critical damping ratio down to not overdamped levels.
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations. |
Appreciate
0
|
04-09-2020, 10:31 AM | #13 |
First Lieutenant
156
Rep 320
Posts |
would you know if they were the stock BCs springs or the custom swift springs that can be ordered with BCs?
Last edited by brigade24; 04-09-2020 at 01:41 PM.. Reason: text quoted was incorrect |
Appreciate
0
|
04-09-2020, 12:10 PM | #14 | |
Captain
480
Rep 681
Posts |
Quote:
__________________
2016 328ix F31 - SOLD!
2006 997.1 C4S |
|
Appreciate
0
|
04-09-2020, 01:36 PM | #15 |
First Lieutenant
156
Rep 320
Posts |
yes you're right...sorry about that. fixed!
Last edited by brigade24; 04-09-2020 at 01:42 PM.. Reason: error correction |
Appreciate
0
|
04-12-2020, 02:32 PM | #17 | |
Lieutenant General
5886
Rep 10,256
Posts |
Quote:
|
|
Appreciate
0
|
04-13-2020, 09:34 PM | #18 |
Captain
157
Rep 928
Posts |
Loving my Fortune Auto Gen 7 series 500 with swift springs 9k ft 14k rear. Rides and handles amazing.
__________________
2015 335i 6sp manual with MPK and sport pack
GPlus intercooler and CP. Stage 1. CG precision dp. Staggered 19?s. 275/35/19, 245/40/19 ps4s. |
Appreciate
0
|
09-16-2020, 05:58 PM | #19 |
Lieutenant
230
Rep 525
Posts |
|
Appreciate
0
|
09-16-2020, 07:45 PM | #20 |
Brigadier General
4016
Rep 3,539
Posts
Drives: 328d Wagon, M2 Comp, i4 eD35
Join Date: Sep 2016
Location: Bay Area, CA
|
Direct from Bilstein customer support.
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations. |
Appreciate
0
|
09-17-2020, 03:45 AM | #21 |
Lieutenant
230
Rep 525
Posts |
ok great thank you.
i was going to contact them! could you comment on whether puttiing the b14 kit on my F32 440i will stop the awful pitching, especially under braking? this is the one thing i'm trying to eliminate the most, its really bad on my car even with the Msport suspension. i've been trying to find the spring rates of the passive Msport suspension setup to at least compare to the bilstein but can't find it anywhere. my intention is to couple the kit with either the H&R or Eibach sway bar kit. EDIT: i just used your excel suspension calculator and popped the figures in. It tells me that with the B14's i'd get PITCH, 2.04 Front and 1.56 rear. So..........am i going to have to pair the rear shocks with significantly stiffer springs? if so what rear springs will give me 1000 lbs/inch spring rate? Brands, part numbers would be super helpful. OR.....would i be better off just going with the B12 pro kit, which consists of B8 dampers and Eibach prokit springs? If i plug those figures into the spreadsheet it comes out with FLAT.....but presumably overall, softer setup than the B14 coilovers. Last edited by gippy; 09-17-2020 at 04:01 AM.. |
Appreciate
0
|
09-17-2020, 10:51 PM | #22 | |
Brigadier General
4016
Rep 3,539
Posts
Drives: 328d Wagon, M2 Comp, i4 eD35
Join Date: Sep 2016
Location: Bay Area, CA
|
Quote:
__________________
-328d Wagon Build Log (with helpful reference links)
-My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations. |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|