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 Mon, Feb-25-2019, 06:06:54 PM   #511
TheGenius46M
Registered User
 
TheGenius46M's Avatar
 
Join Date: Sep 2012
Posts: 2,214
In the garage:
Reputation: 0 TheGenius46M is on a distinguished road
Location: Pleasanton, CA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Running into a slight dilemma here as I am looking to move from 750F 850R to 425F 850R to give me the ideal flat ride I am seeking based on the spreadsheet. Issue I'm hearing I could be facing would be with the 425 front springs in 7."

I am looking to run 18x10 +33 265/35/18 for track wheels and have heard that the 7" spring may pose some fitment issues.

Can a 6" spring be run with 425 lb spring without compromise (I'm pretty low) or will there not be enough travel for that rate?

I need to know like asap because the wheels I'm ordering from bimmerworld are only on sale through Thursday lol.
__________________
2003 E46 M3 TiAg/Cinnamon 6MT
Purchased: 11/13 with 58k miles
Karbonius | MCS | Volk | Recaro | OMP | Hyperco | Ground Control | Besian | AKG | Schroth | Bimmerworld | Turner | PFC | CSF | SuperSprint | Radium Engineering |




Bay Area/ Nor Cal Coding and DME Tuning Specialist. PM for inquiries.

My Build Thread | My Build Journal | Instagram:@thegenius46m
Jump to top TheGenius46M is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Mon, Feb-25-2019, 06:19:42 PM   #512
TboneM3
YNWA
 
TboneM3's Avatar
 
Join Date: Oct 2009
Posts: 10,317
In the garage:
Reputation: 0 TboneM3 is on a distinguished road
Location: Socal

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

As long as you have room on the body for the collar to adjust upwards, I don't see why you couldn't run a 6" spring?
__________________

/// 2004 SilberGrau M3 · Coupe · 6MT · slicktop · zero options · ~3100lbs · JOURNAL
Evolve-R Alpha N · Evolve CF CSL Airbox · Eventuri Scoop · Supersprint V1 stepped 2.5" · SS V1 2.5" sect 1 · OE sect 2 · SCZA 2.5" sect 3 · Besian · RE pulleys/fan delete · CSL battery

Bilstein HD B6 + GroundControl/Eibach 325/550lb + GC "tall" RSMs · Hotchkis front sway · F & R strut bars · TMS camber & subframe plates · Eibach alu rear camber arms · RE trans mounts · AKG poly subf/diff 95a · SDW RTAB · OE weighted ///M knob + ZHP alcantara boot + UUC DSSR

OE CSL trunk · Cobra Nogaros + BK + manual OE bases · TMS black pedals · Sportline 8S 18"x 8.5/9.5" · MPSS 245/275 · APEX 75mm Studs · Brembo 996 4 pot 345mm CSL + Textar & 328mm CSL + ATE · ZHP "712" rack

DD: 2012 TiAg/Blk 128i · N52 · ULEV · Slicktop · 6MT · manual heated seats
Eibach springs & sways · Koni STR.T · Whiteline SF bushes · Dinan camber plates · M3 FCAs
Jump to top TboneM3 is online now   Reply With Quote
Old Mon, Feb-25-2019, 06:25:50 PM   #513
Obioban
Moderator
 
Obioban's Avatar
 
Join Date: Jul 2003
Posts: 39,340
In the garage:
Reputation: 54 Obioban has a spectacular aura about
Location: SE PA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Quote:
Originally Posted by TheGenius46M View Post
Running into a slight dilemma here as I am looking to move from 750F 850R to 425F 850R to give me the ideal flat ride I am seeking based on the spreadsheet. Issue I'm hearing I could be facing would be with the 425 front springs in 7."

I am looking to run 18x10 +33 265/35/18 for track wheels and have heard that the 7" spring may pose some fitment issues.

Can a 6" spring be run with 425 lb spring without compromise (I'm pretty low) or will there not be enough travel for that rate?

I need to know like asap because the wheels I'm ordering from bimmerworld are only on sale through Thursday lol.
Spring should have a usable stroke listed on their spec page. You need need enough usable stroke so that you can bottom out your shock without running out. Anythi ng beyond that is useless.

How far that is depends on spring rate, ride height, shock design, etc/

Example of stroke listing:
__________________

Current Cars: 2005 IR/IR M3, 2001 LMB/blk M5, 04 M3 wagon, 2017 i3
Past cars: 04 M3, 03 530i, 96 M3, S50B32 e36 M3 CM race car

FS: Intravee and various compatible AI Net components.
Jump to top Obioban is offline   Reply With Quote
Old Mon, Feb-25-2019, 06:43:32 PM   #514
TheGenius46M
Registered User
 
TheGenius46M's Avatar
 
Join Date: Sep 2012
Posts: 2,214
In the garage:
Reputation: 0 TheGenius46M is on a distinguished road
Location: Pleasanton, CA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

So here is what Swift’s chart is approximating for 448 (closest to 425 I can find)



And here is what Shaik’s calculator shows for travel:



I should be fine right? Also want to make sure I don’t run into any issues with the shock bottoming out or having too much travel to cause the wheel to hit the fender on dips, etc.


Sent from my iPhone using Tapatalk
__________________
2003 E46 M3 TiAg/Cinnamon 6MT
Purchased: 11/13 with 58k miles
Karbonius | MCS | Volk | Recaro | OMP | Hyperco | Ground Control | Besian | AKG | Schroth | Bimmerworld | Turner | PFC | CSF | SuperSprint | Radium Engineering |




Bay Area/ Nor Cal Coding and DME Tuning Specialist. PM for inquiries.

My Build Thread | My Build Journal | Instagram:@thegenius46m
Jump to top TheGenius46M is offline   Reply With Quote
Old Mon, Feb-25-2019, 07:00:26 PM   #515
Obioban
Moderator
 
Obioban's Avatar
 
Join Date: Jul 2003
Posts: 39,340
In the garage:
Reputation: 54 Obioban has a spectacular aura about
Location: SE PA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Quote:
Originally Posted by TheGenius46M View Post
So here is what Swift’s chart is approximating for 448 (closest to 425 I can find)



And here is what Shaik’s calculator shows for travel:



I should be fine right? Also want to make sure I don’t run into any issues with the shock bottoming out or having too much travel to cause the wheel to hit the fender on dips, etc.


Sent from my iPhone using Tapatalk
Swift springs tend to have more usable stroke that other springs of the same length. I'd find the specs for the springs you're actually running.
__________________

Current Cars: 2005 IR/IR M3, 2001 LMB/blk M5, 04 M3 wagon, 2017 i3
Past cars: 04 M3, 03 530i, 96 M3, S50B32 e36 M3 CM race car

FS: Intravee and various compatible AI Net components.
Jump to top Obioban is offline   Reply With Quote
Old Mon, Feb-25-2019, 07:14:11 PM   #516
TheGenius46M
Registered User
 
TheGenius46M's Avatar
 
Join Date: Sep 2012
Posts: 2,214
In the garage:
Reputation: 0 TheGenius46M is on a distinguished road
Location: Pleasanton, CA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Quote:
Originally Posted by Obioban View Post
Swift springs tend to have more usable stroke that other springs of the same length. I'd find the specs for the springs you're actually running.


Planning to run hyperco 425 6” 2.25ID but can’t seem to find a similar table on their website with the relevant info unless I’m blind and someone else can find that info? Lol. Would appreciate it.


Sent from my iPhone using Tapatalk
__________________
2003 E46 M3 TiAg/Cinnamon 6MT
Purchased: 11/13 with 58k miles
Karbonius | MCS | Volk | Recaro | OMP | Hyperco | Ground Control | Besian | AKG | Schroth | Bimmerworld | Turner | PFC | CSF | SuperSprint | Radium Engineering |




Bay Area/ Nor Cal Coding and DME Tuning Specialist. PM for inquiries.

My Build Thread | My Build Journal | Instagram:@thegenius46m
Jump to top TheGenius46M is offline   Reply With Quote
Old Mon, Feb-25-2019, 07:27:13 PM   #517
bigjae1976
Registered User
 
Join Date: Nov 2008
Posts: 8,069
In the garage:
Reputation: 0 bigjae1976 is on a distinguished road
Location: SW Houston

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Might be OT but is it possible to convert a TC Kline strut to a 2.25” spring?


Sent from my iPhone using Tapatalk
__________________
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola Red
Jump to top bigjae1976 is online now   Reply With Quote
Old Mon, Feb-25-2019, 07:41:49 PM   #518
empty
Registered User
 
Join Date: Aug 2005
Posts: 131
Reputation: 0 empty is on a distinguished road

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

^ should be if it will accept a standard bilstein 2.25” spring perch


Sent from my iPhone using Tapatalk
Jump to top empty is offline   Reply With Quote
Old Mon, Feb-25-2019, 08:01:09 PM   #519
Obioban
Moderator
 
Obioban's Avatar
 
Join Date: Jul 2003
Posts: 39,340
In the garage:
Reputation: 54 Obioban has a spectacular aura about
Location: SE PA

United States




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Quote:
Originally Posted by TheGenius46M View Post
Planning to run hyperco 425 6” 2.25ID but can’t seem to find a similar table on their website with the relevant info unless I’m blind and someone else can find that info? Lol. Would appreciate it.


Sent from my iPhone using Tapatalk
I'd give them a call or shoot them an email, asking. You should have usable stroke >= metal to metal travel of your shocks + spring preload distance (or minus helper spring covered distance when in full droop, if you have them).
__________________

Current Cars: 2005 IR/IR M3, 2001 LMB/blk M5, 04 M3 wagon, 2017 i3
Past cars: 04 M3, 03 530i, 96 M3, S50B32 e36 M3 CM race car

FS: Intravee and various compatible AI Net components.
Jump to top Obioban is offline   Reply With Quote
Old Wed, Feb-27-2019, 09:10:42 PM   #520
M3 dude
Registered User
 
Join Date: Jan 2014
Posts: 524
Reputation: 0 M3 dude is on a distinguished road

Australia




Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Quote:
Originally Posted by TheGenius46M View Post
So here is what Swift’s chart is approximating for 448 (closest to 425 I can find)



And here is what Shaik’s calculator shows for travel:



I should be fine right? Also want to make sure I don’t run into any issues with the shock bottoming out or having too much travel to cause the wheel to hit the fender on dips, etc.


Sent from my iPhone using Tapatalk
you *might* struggle.

if we assume a useable shock stroke of 120mm, ~4.5"
-you'll have 2" of droop
-2.5" of bump.
(some shocks have way more droop, but we're limited by bump travel)
a 400-450 spring compresses almost 2" when loaded on the front of a std weight m3 - basically the spring is fully captive but unloaded at full droop.
Jump to top M3 dude is offline   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 03:15:28 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2020, 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 FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffness) 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)