BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


Reply
 
Thread Tools Display Modes
Old Sat, Oct-03-2015, 06:32:55 PM   #1
EricSMG
40 something
 
Join Date: Nov 2008
Posts: 10,902
Reputation: 0 EricSMG is on a distinguished road
Location: San Diego

United States




Default Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

In my never ending quest to find the ultimate street suspension for this car, the latest experiment involves custom valved Billy HD dampers with either OE/Dinan/Eibach springs.

The question is - who knows how to custom valve a Bilstein AND understands what I'm after? Meet Shaikh, owner/designer, Fat Cat Motorsports. About six months ago I got wind of this character and what he does and so I called him - we talked for an hour! We discussed what he does, all of my trials and tribulations and what I'm after.

Specifically, I told him that the best shock I've used for this car, overall, is the Billy HD damper. However, it is not perfect in that:

1. They've too much gas pressure and raise the ride height
2. The fronts are severely limited in bump travel due to long bumpstops
3. They're just a wee bit too aggressive overall

I love the precision feel of this damper but want it 'dialed back' a bit. I want calm and polite without giving up handling. I want perfect balance. He said "that's exactly what I do!". So for the last six months we've been discussing various things, looking at shock dynos and..... he even drove down to my home in San Diego from San Fran to give me a ride in his own E46 330i sedan!

I thought you guys would love to see some real data, as I do, so I had him dyno the following dampers, dynos down below a bit.

Note - all dampers have less than 1000 miles on them.

1. OE Genuine BMW
2. Konis
3. Billy HDs
4. E36 M3 rear Konis (just for fun since I'd been running these for a while)

Front dampers. Here we can see the OE (red) has firm initial comp and soft initial rebound but the rebound falls of a cliff - way way too stiff, which is why they feel harsh over sharp bump. The HD (green) has a nice initial comp which is why it glides better over little stuff but too much mid/high rebound. Koni has more comp than HD but much less rebound.



Rear dampers including E36 M3 Koni. OE is a disaster here. No wonder they feel like shit!! Also note the firm initial bump of the 46M Koni (red arrow) compared to the soft HD (red line). HD has too much overall force on both comp and rebound, though, which is why the rear of the car gets a little 'rowdy' with these dampers.



Rear E46 M3 Koni at various settings:



Front Koni at various settings:



OE M3 vs OE 330 front dampers. This illustrates partly why the non-Ms ride WAY smoother.



Koni hysteresis. Pretty bad.



OE Sachs hysteresis. Really bad.



Front HD Bumpstop. Way too long. FCM will trim these about 50%, gaining back more than the inch they lose.



Shaikh is building me a set of custom HDs featuring his:

1. Elite revalve (this dictates the 'knee' point, the shape of the curves, the amount of force at any given velocity and the ratio between bump and rebound forces)
2. Ripple reducer (this allows the shock to react quickly to tiny ridges in the surface)
3. Custom gas pressure
4. Custom/shortened bumpstops front and rear

He also offers the KBO (kerb blow-off) for ultimate experience - this is an ultra digressive shape that blows flat at high velocities. I wanted to first feel the revalve before going this route.

They will be ready soon, followed by a review!
__________________


'04 SG/Black 6MT || '04 JB/IR SMG

Last edited by EricSMG; Sat, Oct-03-2015 at 07:48:41 PM.
Jump to top EricSMG is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Sat, Oct-03-2015, 07:06:36 PM   #2
Mr. Wolfe
Anti-Bling
 
Mr. Wolfe's Avatar
 
Join Date: Apr 2006
Posts: 17,383
In the garage:
Reputation: 0 Mr. Wolfe is on a distinguished road
Location: Above Pittsburgh

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Wow, can't wait to read your review Eric!

Mr. Wolfe
__________________

2006 Interlagos/Black ///M3 Coupe 6MT
1987 Turquoise Green / Imola Red 325is Mtech1 w/ M62 V8 Swap
1994 Porsche 911 Turbo-Look
2003 Alpine/Cinnamon ///M3 Coupe 6MT (SOLD)
2003 Steel Gray/Black ///M3 Coupe 6MT (SOLD)
Jump to top Mr. Wolfe is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:10:18 PM   #3
MarcZCP
Registered User
 
MarcZCP's Avatar
 
Join Date: Oct 2014
Posts: 246
Reputation: 0 MarcZCP is on a distinguished road
Location: Ottawa area

Canada




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

I've heard nothing but good about Fat Cat Motorsports - I think you're in good hands.

Really really looking forward to your review once you get these installed.
__________________

2006 M3 ZCP 6MT Interlagos blue, black retrofit interior
2013 Acura TL SHAWD 6MT - Daily driver
2005 Mazda RX8 - Gone but not forgotten
Jump to top MarcZCP is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:16:59 PM   #4
AP22
AMG.
 
Join Date: Feb 2014
Posts: 1,388
In the garage:
Reputation: 0 AP22 has disabled reputation

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Oh, this'll be good.
__________________
AMG ftw.
Jump to top AP22 is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:21:00 PM   #5
Brian N
wubalubadubdub
 
Brian N's Avatar
 
Join Date: Oct 2007
Posts: 2,930
In the garage:
Reputation: 0 Brian N is on a distinguished road
Location: Orange County, CA

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Wow this is mighty impressive. I really hope this does the trick for you.

Does Fat Cat Motorsport revalve or have experience with other brands? Custom valuing is something I have been interested in as well.
__________________


-My Journal-
Jump to top Brian N is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:21:13 PM   #6
m3 hal
Registered User
 
Join Date: Jan 2006
Posts: 21,634
Reputation: 0 m3 hal will become famous soon enough

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

quality post
Jump to top m3 hal is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:36:14 PM   #7
terraphantm
Moderator
 
Join Date: Dec 2010
Posts: 11,269
In the garage:
Reputation: 11 terraphantm is on a distinguished road
Location: Philadelphia

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Looking forward to your impressions. Could very well end up being what I'm looking for
__________________
Jump to top terraphantm is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:47:44 PM   #8
EricSMG
40 something
 
Join Date: Nov 2008
Posts: 10,902
Reputation: 0 EricSMG is on a distinguished road
Location: San Diego

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Quote:
Originally Posted by Brian N View Post
Wow this is mighty impressive. I really hope this does the trick for you.

Does Fat Cat Motorsport revalve or have experience with other brands? Custom valuing is something I have been interested in as well.
I'm not sure but he really likes the Bilstein 'foundation' with their big pistons, monotube design and robust build quality.

Shaikh actually joined this forum so look for his comments in this thread at some point!
__________________


'04 SG/Black 6MT || '04 JB/IR SMG

Last edited by EricSMG; Sat, Oct-03-2015 at 07:56:36 PM.
Jump to top EricSMG is offline   Reply With Quote
Old Sat, Oct-03-2015, 07:54:48 PM   #9
Brian N
wubalubadubdub
 
Brian N's Avatar
 
Join Date: Oct 2007
Posts: 2,930
In the garage:
Reputation: 0 Brian N is on a distinguished road
Location: Orange County, CA

United States




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Quote:
Originally Posted by EricSMG View Post
I'm not sure but he really likes the Bilstein 'foundation' with their big pistons, monotube design and robust built quality.

Shaikh actually joined this forum so look for his comments in this thread at some point!
Awesome can't wait to hear more.
__________________


-My Journal-
Jump to top Brian N is offline   Reply With Quote
Old Sat, Oct-03-2015, 08:38:28 PM   #10
HassanEido
Registered User
 
HassanEido's Avatar
 
Join Date: Oct 2014
Posts: 3,415
In the garage:
Reputation: 0 HassanEido is on a distinguished road

Lebanon




Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Wow subbed
Jump to top HassanEido is online now   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT. The time now is 05:56:04 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing Shock dynos, Fat Cat Motorsports and custom valved Bilstiens in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)