FCM Elite Ride Harmonizer Spreadsheet, v2.0   BMW E46 M3 (2000-2006) FRC & Setup Comparison   FCM Elite Stage 3 testimonials (Ripple Reducer + KBO)          
  Copyright © SHAIKH JALAL AHMAD   Press 'Reset' at bottom left to recover original settings   SCCA Nationals trophy winner, Clint - Mazdaspeed 6  
                http://www.fatcatmotorsports.com/contact_elite.htm   NASA track racer Percy - BMW E36 M3  
  A NOTE to YOU, the USER:                
  Enter values for your setup in Blue cells and observe the results. ANY blue value can be changed/over-written! RESET button at bottom left.  
  For more instructions, watch: 'How to Use FCM Elite Ride Harmonizer FRC and Setup Comparison spreadsheet'  
  EricSMG's M3forum thread 'Shock dynos, Fat Cat Motorsports and custom valved Bilstiens', has FCM Elite Stage 2 setup (with Ripple Reducer)  
  Listen to Shaikh engage in an FCM Elite Project Consultation using a Ride Harmonizer spreadsheet   
                             
  FCM Elite Stage 3 testimonial from Anthony Zwain, NASA National Champion, owner of Edge Motorworks Mtn View, BMW specialist, previous user of JRZ, Koni, Moton, AST, etc.  
  "Hey Shaikh, I just got back from 2018 NASA championships at COTA, we had a successful time despite fighting through a few issues beyond our control. We swept the Podium in TT4 getting 1st-3rd and in ST-4 the race group placed 2nd-4th. All those cars were running your shocks set-up"  
   
                             
  Standard rear spring location | Tubular or Solid Sway Bar inputs: For a Solid Bar, thickness = 0.5 * Outside Diameter; For a Tubular bar, thickness = wall thickness  
  Front Sway Bar Outside Diameter Front Bar thickness (for solid = 1/2* OD) Rear Sway Bar Outside Diameter Rear Bar thickness (for solid = 1/2* OD) Front spring Rear Spring Bump stop rate Front Bump stop rate Rear Bounce Frequency (Hz) Ratio, Bounce Freq Flat Ride or Pitch? Front Roll Couple (FRC) Total Roll Stiffness Front Roll Stiffness Rear Roll Stiffness Bar ratio (bar stiff / total roll stiff) Spring ratio (spr stiff / total roll stiff) Comments  
  mm mm mm mm lb/in lb/in lb/in lb/in Front  Rear R/F   % lb-ft/deg % %    
   
   
   
   
  OE sways (mm) Front bar length Front arm length Rear bar length Rear arm length                  
                       
                             
  mm mm mm mm lb/in lb/in lb/in lb/in Front  Rear R/F   % lb-ft/deg % %              
   
   
   
   
  Turner sways (mm) Front bar length Front arm length Rear bar length Rear arm length                
                 
                 
  mm mm mm mm lb/in lb/in lb/in lb/in Front  Rear R/F   % lb-ft/deg % %              
   
   
  10speed, SCCA STU autocross setup  
  FCM Elite Stage 3 setup E46 330i, 'Christina'  
  GC front sway (mm) Front bar length Front arm length Rear bar length Rear arm length  
   
 
  Rear coil-over spring | Tubular or Solid Sway Bar inputs: For a Solid Bar, thickness = 0.5 * Outside Diameter; For a Tubular bar, thickness = wall thickness  
  Front Sway Bar Outside Diameter Front Bar thickness (for solid = 1/2* OD) Rear Sway Bar Outside Diameter Rear Bar thickness (for solid = 1/2* OD) Front spring Rear Spring Bump stop rate Front Bump stop rate Rear Bounce Frequency (Hz) Ratio, Bounce Freq Flat Ride or Pitch? Front Roll Couple (FRC) Total Roll Stiffness Front Roll Stiffness Rear Roll Stiffness Bar ratio (bar stiff / total roll stiff) Spring ratio (spr stiff / total roll stiff) Comments  
  mm mm mm mm lb/in lb/in lb/in lb/in Front  Rear R/F   % lb-ft/deg % %    
   
   
   
  Sway bar dims (mm) Front bar length Front arm length Rear bar length Rear arm length  
   
 
  ADJUSTABLE SWAY BAR ARM (or ELBOW) LENGTH, Effect on Front Roll Couple % (FRC %). Keep spring rate & sway bar thickness constant, vary front and/or rear arm length to see FRC changes.  
  Front Sway Bar Outside Diameter Front Bar thickness (for solid = 1/2* OD) Rear Sway Bar Outside Diameter Rear Bar thickness (for solid = 1/2* OD) Front spring Rear Spring Input sway bar length (mm) Input sway bar elbow length (mm) Bump stop rate Front Bump stop rate Rear Bounce frequency (Hz) Ratio, Bounce Freq (Hz) Flat Ride or Pitch? Front Roll Couple (FRC) Total Roll Stiffness Front roll stiffness Rear roll stiffness Comments  
  mm mm mm mm lb/in lb/in Front  Rear Front  Rear lb/in lb/in Front  Rear R/F   % lb-ft/deg    
   
   
   
   
   
   
   
 
  Racer's Edge , utilize corner weights and tune spring rates to obtain matching left and right bounce frequencies! All rows use sway bar data from below  
  Front Sway Bar Outside Diameter Front Bar thickness (for solid = 1/2* OD) Rear Sway Bar Outside Diameter Rear Bar thickness (for solid = 1/2* OD) Corner weights (w/driver), LF/RF top, LR/RR bot Total weight Front weight Rear weight Cross weight, (LR+RF) / total Spring rates, LF/RF top, LR/RR bot Bounce Freqs, LF/RF top, LR/RR bot Bounce Freq Ratio L-FRC R-FRC Max bump force @ 30 ips Target bump force @ 5ips  
  mm mm mm mm lb   lb % % % lb / in Hz Left side Right side % lb-f lb-f  
   
  Setup 1: standard rear spring                  
                                               
   
  Setup 2: standard rear spring                  
                                               
   
  Setup 3: coil-over rear spring                  
                                               
   
  Setup 4: coil-over rear spring                  
 
  Total loaded vehicle weight (lb)   Nominal curb weights (lb)   Front Sway Bar (mm) - see table below   Rear Sway Bar (mm) - see table below  
  Curb weight (lb)   M3 Coupe 3415   Bar length Arm length   Bar length Arm length  
  Driver & passenger weight (lb)   M3 Convertible  3838      
  Total loaded weight (lb)   M3 CSL  3075  
     
  Weight dist (%)   Sprung weight (lb)   Unsprung weight (lb) Tire weight (lb) Wheel weight (lb) Est. or meas'd weight of susp. components (lb)  NOTE: Unsprung weight is tire weight + wheel weight + 50% of total suspension components weight. If direct measurements aren't possible, taking 10% of the corner weight as unsprung weight is a reasonable assumption  
  Front   Front   Front Front Front Front      
  Rear   Rear   Rear Rear Rear Rear      
                                       
  Vehicle track (in)   Spring motion ratios   Shock motion ratios   Sway bar motion ratios                
  Front   Front 0.938   Front 0.938   Front 0.938   E46 front bars  OD Thk Bar length Arm length   
  Rear   Rear, OE 0.63   Rear 1.15   Rear 0.44   M3 coupe front 26 13.00 835 290  
  Wheelbase 107.5   Rear, c/o 1.15               CSL front 30.8 4.18 835 290  
                Ideal corner weight calculator - enter current weights in BLUE for expected weights @ 50% cross:   M3 convertible fr 27 13.50 835 290              
  Flat Ride calculator based on target road speed:       Turner fr, stiff 30.2 15.10 850 260              
  Target road speed (mph)         Turner fr, med 30.2 15.10 850 281              
  Target rear ride frequency (Hz)       Current corner weights (lb)   Turner fr, soft 30.2 15.10 850 302              
  FCM recc front ride freq (Hz)       LF RF   GC Race fr, soft 32.4 4.78 830 250              
  Flat Ride freq ratio (rear / front)       LR RR   GC Race fr, med 32.4 4.78 830 230              
                Total wt Front wt%   GC Race fr, stiff 32.4 4.78 830 214              
  Comments and NAM3 Suspension links     Cross wt% Left wt%   ECS / Eibach, stiff 27 13.50 830 260              
  Everthing about Fat Cat Motorsports Suspension by duracellttu     Cross wt Delta (lb)   ECS / Eibach, soft 27 13.50 830 280              
 
    Expected weights @ 50% cross (RF+LR / Total wt)   Hotchkiss fr, stiff 30.2 4.18 830 260              
  7/2/24 - Thanks to @cobra for providing precise rear damper and spring motion ratio values       Hotchkiss fr, med 30.2 4.18 830 280              
      LF RF   Hotchkiss fr, soft 30.2 4.18 830 302              
      LR RR   H&R fr, stiff 30.2 15.10 830 260              
      Total wt Front wt%   H&R fr, soft 30.2 15.10 830 305              
      Cross wt%  Left wt%   330i Sport fr 24 12.00 830 290              
                330Ci front 23.5 11.75 830 290              
                                             
  Unit Converter         Front spring perch height change for new spring rate (lb/in) and length (in) to keep current ride height   E46 rear bars  OD Thk Bar length Arm length               
  Deg F Deg C lb kg in mm     M3 coupe/vert rr 21.5 10.75 580 230              
    Current front spring rate (lb/in)   CSL rear 22.5 11.25 580 230              
  Deg C Deg F kg lb mm in   Current front spring length (in)   Turner rr, stiff 25.6 12.80 580 230              
    Current spring deflection (in)   Turner rr, soft 25.6 12.80 580 260              
  kg-(force) N lb kPa psi bar   Current spring loaded height (in)   GC Race rear 32.4 2.10 570 230              
                                 
  N kg-(force) lb psi kPa bar   New front spring rate (lb/in)   NOTE1: 7/2/24 - Updated rear shock & spring MR from @cobra (thanks!)

NOTE2: only FRONT non-M sway bars fit the M3 		             
    New front spring length (in)   GC Race front, 1.275" OD, L thk = 0.188", M thk = 0.155"              
  lb kg-(force) N bar psi kPa   New spring deflection (in)   GC Race rear, 1.275" OD, S thk = 0.083", SS thk = 0.062"              
    New spring loaded height (in)                            
  kg/mm N/mm lb/in toe (in) wheel dia toe (deg)   Change in spring perch position to keep current height (in)                            
                               
  N/mm kg-f/mm lb/in toe (deg) wheel dia toe (in)                                      
                                       
  lb/in kg-f/mm N/mm                                            
                                             
                             
             
  E46 front bars  OD Thk Bar length Arm length 
  M3 coupe front 26 13.00 835 290
  CSL front 30.8 4.18 835 290
  M3 convertible fr 27 13.50 835 290
  Turner fr, stiff 30.2 15.10 850 260
  Turner fr, med 30.2 15.10 850 281
  Turner fr, soft 30.2 15.10 850 302
  GC Race fr, soft 32.4 4.78 830 250
  GC Race fr, med 32.4 4.78 830 230
  GC Race fr, stiff 32.4 4.78 830 214
  ECS / Eibach, stiff 27 13.50 830 260
  ECS / Eibach, soft 27 13.50 830 280
  Hotchkiss fr, stiff 30.2 4.18 830 260
  Hotchkiss fr, med 30.2 4.18 830 280
  Hotchkiss fr, soft 30.2 4.18 830 302
  H&R fr, stiff 30.2 15.10 830 260
  H&R fr, soft 30.2 15.10 830 305
  330i Sport fr 24 12.00 830 290
  330Ci front 23.5 11.75 830 290
             
  E46 rear bars  OD Thk Bar length Arm length 
  M3 coupe/vert rr 21.5 10.75 580 230
  CSL rear 22.5 11.25 580 230
  Turner rr, stiff 25.6 12.80 580 230
  Turner rr, soft 25.6 12.80 580 260
  GC Race rear 32.4 2.10 570 230
             
  NOTE: only FRONT non-M sway bars fit the M3
  GC Race front, 1.275" OD, L thk = 0.188", M thk = 0.155"
  GC Race rear, 1.275" OD, S thk = 0.083", SS thk = 0.062"