Bilstein B6 Mono or Koni FSD?

umut335i · 02-05-2015, 06:15 AM

As per the title which would you prefer to have paired with Eibach Pro Kit;

The car is an e93 335i m sport...

I keep bottoming out over humps even though she's not that low? Weird!

Could it be the bump stops or knackered shocks?

Umut

mob17 · 02-05-2015, 09:29 AM

Out of those two, the Bilsteins.

Koni FSDs are best to use for stock height springs, and even then they aren't great for handling. Bouncyness has been reported!

The issue could be either knackered shocks or bumpstops. My guess, the shocks.

Mileage?

Phil325i · 02-05-2015, 01:32 PM

Or KONI Yellows..?

jimborae · 02-06-2015, 05:53 AM

Another vote for Koni Yellows, have them on mine with Eibach Pro springs and it's a very good combination.

umut335i · 02-06-2015, 05:54 AM

Quote:

Originally Posted by mob17

Out of those two, the Bilsteins.

Koni FSDs are best to use for stock height springs, and even then they aren't great for handling. Bouncyness has been reported!

The issue could be either knackered shocks or bumpstops. My guess, the shocks.

Mileage?

Thanks for your input mate.

74k

umut335i · 02-06-2015, 05:57 AM

whats the difference between koni fsd and yellows? my guess is one is adjustable one is not? other than this?

mob17 · 02-06-2015, 09:34 AM

Quote:

Originally Posted by umut335i

whats the difference between koni fsd and yellows? my guess is one is adjustable one is not? other than this?

A lot. FSDs are for stock height springs, for stock performance. Yellows are better, and you get adjustable damping too which is very nice to have so you can fine tune your ride.

Just be sure to get the rear yellows which you can adjust from the boot with extenders. Some rear yellows you have to jack it up.

Yellows and Eibachs would be a good match. Or you could go Bilstein B12.

RajB · 02-06-2015, 04:27 PM

I've had FSDs and yellows on different vehicles.

FSDs are ideally for stock springs but can be used with eibachs (I did) but are not manually adjustable. They react to the forces being put on them.

Yellows are adjustable damping as they have a valve you can adjust.

Personally prefer the yellows.

umut335i · 02-06-2015, 07:19 PM

Sounds good thanks everyone!

02-05-2015, 06:15 AM	#1
umut335i Lieutenant 28 Rep 407 Posts Drives: 335i Convertible 2007 Join Date: May 2014 Location: Kent UK iTrader: (0)	Bilstein B6 Mono or Koni FSD? As per the title which would you prefer to have paired with Eibach Pro Kit; The car is an e93 335i m sport... I keep bottoming out over humps even though she's not that low? Weird! Could it be the bump stops or knackered shocks? Umut
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02-05-2015, 09:29 AM	#2
mob17 Major General 400 Rep 5,623 Posts Drives: E92 335D Join Date: Mar 2012 Location: East Midlands, UK iTrader: (5)	Out of those two, the Bilsteins. Koni FSDs are best to use for stock height springs, and even then they aren't great for handling. Bouncyness has been reported! The issue could be either knackered shocks or bumpstops. My guess, the shocks. Mileage?
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02-05-2015, 01:32 PM	#3
Phil325i Brigadier General 624 Rep 3,200 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Or KONI Yellows..? __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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02-06-2015, 05:53 AM	#4
jimborae Second Lieutenant 11 Rep 238 Posts Drives: E91 335i M-Sport LCI Manual Join Date: Mar 2014 Location: UK iTrader: (2)	Another vote for Koni Yellows, have them on mine with Eibach Pro springs and it's a very good combination.
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02-06-2015, 05:57 AM	#6
umut335i Lieutenant 28 Rep 407 Posts Drives: 335i Convertible 2007 Join Date: May 2014 Location: Kent UK iTrader: (0)	whats the difference between koni fsd and yellows? my guess is one is adjustable one is not? other than this?
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02-06-2015, 04:27 PM	#8
RajB Brigadier General 448 Rep 3,312 Posts Drives: E92 335i Join Date: Nov 2014 Location: Midlands iTrader: (4)	I've had FSDs and yellows on different vehicles. FSDs are ideally for stock springs but can be used with eibachs (I did) but are not manually adjustable. They react to the forces being put on them. Yellows are adjustable damping as they have a valve you can adjust. Personally prefer the yellows. __________________ E92 335i / M3 Hybrid - The Build
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02-06-2015, 07:19 PM	#9
umut335i Lieutenant 28 Rep 407 Posts Drives: 335i Convertible 2007 Join Date: May 2014 Location: Kent UK iTrader: (0)	Sounds good thanks everyone!
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