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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 Sat, Oct-20-2018, 05:24:38 AM   #121
FrankJones
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Are you still going for the 448/840?
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Old Sat, Oct-20-2018, 05:56:47 AM   #122
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Are you still going for the 448/840?
Yea, I wouldn't mind a slightly higher flat ride percentage, as my main concern with ride quality is street and highway driving between 30-80mph. That being said, I don't really want to go lower than 448 in the front because I know I want to go significantly stiffer than the current spring, which is 342 or something like that (slightly apples to oranges here, as the current spring is a progressive). I also am reluctant to go higher than 840 in the rear because 800+ just sounds so stiff to me. Maybe this is just me having a hard time breaking the mold of "traditional" spring rates in my mind.

I already have the 448/840 springs so I might as well try them and then switch up either the front or the rear depending on how it feels.
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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 Sat, Oct-20-2018, 07:09:44 AM   #123
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

^same here. It’s whacky, I could literally swap my old setup front to back and it would make flat ride!
You could test leaving your front springs on and throw the 840s in the back. With a 30mm front sway, you would get 17% and 72% FRC. Might surprise you. Seems that even the aggressive Porsche’s have 12-37% flat ride!
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Old Sat, Oct-20-2018, 04:49:03 PM   #124
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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^same here. Itís whacky, I could literally swap my old setup front to back and it would make flat ride!
You could test leaving your front springs on and throw the 840s in the back. With a 30mm front sway, you would get 17% and 72% FRC. Might surprise you. Seems that even the aggressive Porscheís have 12-37% flat ride!
You know, now that you mention this, I think I have to test that set up. Using the 840 rear with the stock front is the only way to try a higher flat ride percentage without buying more springs. The damping will be fooked but itís worth testing at least.

One caveat with comparing the P car percentages is that theyíre managing very different weight distributions than our cars are. That makes me take their numbers with a grain of salt.

I was planning on buying stock springs and shocks to use while the Bilsteins are away because Iíve never even driven a stock-springed e46 m3 and I wanted to compare, but now Iím leaning towards buying my friendís cheapo Vogtlands, using the swift rear and keeping my ride height and alignment settings as they are now. Maybe I could even try the swift fronts on those as well if they fit...
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Old Sun, Oct-21-2018, 11:48:54 PM   #125
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Will an e46 non-sport 323i/328i/323Ci/328Ci rear sway bar (15 mm) bolt-on/fit on the e46 M3? Seems to be the smallest e46 bar I have been able to find.

Trying to the the FRC% in the desirable range. GC race, likely medium, on the front.

Current focused on a set-up using 475 (2.24)/425 (2.38) for 6% flat ride, but need to get the sway bars sorted.

Also considering 500 (2.3)/425 (2.38)[3%FR] or 450(2.45)[6%FR].

Let me know your thoughts.

thanks,
Mike
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Old Mon, Oct-22-2018, 05:13:03 AM   #126
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

Anyone gonna make an Excel of this set up with this and that is best for this circumstance?
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Old Mon, Oct-22-2018, 12:12:11 PM   #127
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Anyone gonna make an Excel of this set up with this and that is best for this circumstance?
Kind of defeats the purpose-- the spreadsheet in the OP lets you make it specific to your car, with your mods, your values, and with you in it.
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Old Mon, Oct-22-2018, 04:34:24 PM   #128
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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Obioban, whenever possible I measure damper motion ratios via a series of wheel vs. shock shaft displacements. The rear spring MR was estimated with spring off using a tape measure at fixed points while displacing the suspension. People can post all kinds of numbers they get from all kinds of sources. I measured these myself a while back therefore I'm using values I can trust.
Is it possible they're different on your 330i than they are on the M3?

I just BCCed an email to TC Kline, Ground Control, MCS, and JRZ, asking them what the e46 M3 motion ratios are.

TC: 1:1 front, .66 rear
GC: .97 front, .67 rear

Will update this post with MCS's and JRZ's when they reply
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Old Mon, Oct-22-2018, 06:17:11 PM   #129
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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 Obioban View Post
Is it possible they're different on your 330i than they are on the M3?

I just BCCed an email to TC Kline, Ground Control, MCS, and JRZ, asking them what the e46 M3 motion ratios are.

TC: 1:1 front, .66 rear
GC: .97 front, .67 rear

Will update this post with MCS's and JRZ's when they reply
What motion ratios is Shaikh using? Iím not seeing them in the thread.
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Old Mon, Oct-22-2018, 06:53:36 PM   #130
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Default Re: FCM E46 M3 Ride Harmonizer suspension spreadsheet (bounce freqs, FRC, roll stiffn

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What motion ratios is Shaikh using? Iím not seeing them in the thread.
In the spreadsheet, it's .96 front, .7 rear.
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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)