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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.


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Old Thu, Feb-21-2019, 11:38:52 PM   #491
eacmen
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by gearhead55 View Post
Where are you seeing a 1.5 freq ratio? Those rates should give me 1.02 freq ratio.



I chose those spring rates because I wanted a linear spring stiffer up front than my PSS9 spring, which Bilstein told me was 340 or 380, I don’t remember now. The bounce frequencies with 448/840 are close to GT3 frequencies, which is what I’m shooting for, ride quality/stiffness wise. I spent some time driving a 991 GT3 RS and would like to replicate that. They’re also close to Shaikh’s 330i, which by anecdotal accounts seems like a good balance of track stiffness and streetable ride quality.



The only aspect that I am not sure about is the front bar. Ideally I would like a 29mm bar, but couldn’t find one. I may end up switching to 30mm bar depending on how this set up behaves.


Are you using pss9 dampers for the FCM build?
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Old Thu, Feb-21-2019, 11:52:55 PM   #492
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by eacmen View Post
Are you using pss9 dampers for the FCM build?
Yes PSS9 dampers, swift springs.
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nah this one dude on the forum said it was all good. I'm sure he knows what he's talking about.
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Old Fri, Feb-22-2019, 12:44:15 AM   #493
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by gearhead55 View Post
Yes PSS9 dampers, swift springs.
Interested to hear your results.

I would urge you/FCM to err on the "sport" side of the sport/comfort scale. Essentially, have him just soften the rebound edge a pinch as I've found the Billy dampers to be pretty good out of the box. Just a very subtle tweak here and there and they'll be perfect. FCM's sport setting should handle extremely good and be a bit more plush on the street than would normally be expected.

I never went for the full KBO. Just the standard re-valve, custom reduced pressure, trimmmed front bumps and ripple reducer.
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Old Fri, Feb-22-2019, 02:16:23 AM   #494
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Hmm, plugged those rates into the spreadsheet, will give it another try.



Sent from my iPhone using Tapatalk


You were right, I reset the page then re-entered.

I’m thinking about 500 f & 425 r, coil over rear, 1.06 flat ride, GC large front bar & stock rear, JRZ RS pros.


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Old Fri, Feb-22-2019, 03:08:28 PM   #495
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by EricSMG View Post
Interested to hear your results.

I would urge you/FCM to err on the "sport" side of the sport/comfort scale. Essentially, have him just soften the rebound edge a pinch as I've found the Billy dampers to be pretty good out of the box. Just a very subtle tweak here and there and they'll be perfect. FCM's sport setting should handle extremely good and be a bit more plush on the street than would normally be expected.

I never went for the full KBO. Just the standard re-valve, custom reduced pressure, trimmmed front bumps and ripple reducer.
Ok thanks for the tips! I’m going the same route, ripple reducer but no KBO.

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Originally Posted by empty View Post
You were right, I reset the page then re-entered.

I’m thinking about 500 f & 425 r, coil over rear, 1.06 flat ride, GC large front bar & stock rear, JRZ RS pros.
That sounds like a good set up. How do you plan to use the car? And are the RS pros the double adjustable ones? I’m not sure if they’ve changed this, but I guess the 2-way JRZs are a dual-tube design and are inferior to the single adjustable monotube design. The 3-ways are monotube again though. This is just something I heard from the race shop I go to and I haven’t researched myself, so take that with a grain of salt.
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Old Fri, Feb-22-2019, 06:27:18 PM   #496
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by gearhead55 View Post
but I guess the 2-way JRZs are a dual-tube design and are inferior to the single adjustable monotube design. The 3-ways are monotube again though. This is just something I heard from the race shop I go to and I haven’t researched myself, so take that with a grain of salt.
A twin tube isn't necessarily "inferior" to a monotube. Each type has their strengths and weaknesses.

Granted, generally speaking, a monotube is probably better suited for 100% track use, but IMO quality is much more important. I would rather have a quality twin tube than a crappy monotube.
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Old Fri, Feb-22-2019, 06:43:09 PM   #497
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by gearhead55 View Post
Ok thanks for the tips! I’m going the same route, ripple reducer but no KBO.







That sounds like a good set up. How do you plan to use the car? And are the RS pros the double adjustable ones? I’m not sure if they’ve changed this, but I guess the 2-way JRZs are a dual-tube design and are inferior to the single adjustable monotube design. The 3-ways are monotube again though. This is just something I heard from the race shop I go to and I haven’t researched myself, so take that with a grain of salt.


Plan is for a streetable track car, only two seats and kids are HS & college, likely only me in the car 90% of the time.

RS pros are monotube 2-ways with remote reservoir.

Thx


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Old Fri, Feb-22-2019, 07:32:35 PM   #498
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by elbert View Post
A twin tube isn't necessarily "inferior" to a monotube. Each type has their strengths and weaknesses.

Granted, generally speaking, a monotube is probably better suited for 100% track use, but IMO quality is much more important. I would rather have a quality twin tube than a crappy monotube.
Sure, but I’m comparing the twin-tube/monotube from the same manufacturer, ‘quality’ should be consistent. Supposedly the twin-tube JRZs ride noticeably worse than the monotubes.


Quote:
Originally Posted by empty View Post
Plan is for a streetable track car, only two seats and kids are HS & college, likely only me in the car 90% of the time.

RS pros are monotube 2-ways with remote reservoir.

Thx
Sounds dope!
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Old Fri, Feb-22-2019, 08:35:29 PM   #499
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by gearhead55 View Post
Sure, but I’m comparing the twin-tube/monotube from the same manufacturer, ‘quality’ should be consistent. Supposedly the twin-tube JRZs ride noticeably worse than the monotubes.
Fair enough. When you said it was inferior, I thought you referring to twin tube as an inferior design.

But in this particular case, yes, that twin tube might be an inferior product. Generally speaking, the ride of a twin tube *should* be better than a monotube because of the lower gas pressure. In theory, anyway.
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Old Sat, Feb-23-2019, 12:43:36 AM   #500
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Originally Posted by Mike RT4 View Post
OE plates and CSL king-pins do almost 2½° negative on their max setting .
I got my car aligned and easily got -2.0 with OEM plates and Dinan camber plates. I don't doubt an OEM, Dinan, CSL kingpin setup would get -3 or maybe a bit more.
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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)