e46 M3 suspension setup, or how to not downgrade your car with suspension mods

[duracellttu]

Had me searching deep for the pic.

Nice, looks like you have some significant weight reduction.

[Cronenberged]

Can you share your corner weights?

Had me searching deep for the pic.

[mrgizmo04]

Yes recommended by FCM, based on corner weights and dual use. Don't have have aero yet, but eventually.

I guess I can see it if your car is rather stripped where you are carrying closer to 55-60% of weight in the front.

What are your FRC and hz ratio per FCM setup recommendations?

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[mrgizmo04]

Is the approach to aim between a 45-70 mph flat ride?

Yeah, remember, it is somewhat "static", so you need to aim for avg cornering speeds on track. That will differ on a more technical/slow speed vs a more open higher speed, but 45-70 is a decent range.

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[duracellttu]

Yeah that's set up for "flat" ride at like 300mph with those frequencies...

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Is the approach to aim between a 45-70 mph flat ride?

[mrgizmo04]

Per the spreadsheet, those spring rates give you a 1% flat ride.

Yeah that's set up for "flat" ride at like 300mph with those frequencies...

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[duracellttu]

Yes recommended by FCM, based on corner weights and dual use. Don't have have aero yet, but eventually.

Can you share your corner weights?

[Cronenberged]

Yes recommended by FCM, based on corner weights and dual use. Don't have have aero yet, but eventually.

[duracellttu]

My previous suspension was TCK SA and after talking with TC he recommended 400F/500R spring rates. Any idea why the spring rates are so much different than flat rides approach?

[duracellttu]

With those rates it sounds borderline pitchy, and adding GC on full stiff to those front rates sounds very understeery...

Did FCM suggest these rates/bar settings? Are you running heavy aero/splitter to counter?

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Per the spreadsheet, those spring rates give you a 1% flat ride.

[mrgizmo04]

I went with a build directly built by FCM.

H&R street coilvers
450lb 6" f spring
800lbs 6" r spring
GC weighted jacks
GC front Sway bar stiffest setting
OE rear sway bar.

Will give some feed back as soon I get everything in and on the car.

With those rates it sounds borderline pitchy, and adding GC on full stiff to those front rates sounds very understeery...

Did FCM suggest these rates/bar settings? Are you running heavy aero/splitter to counter?

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[duracellttu]

For those on a budget, my current setup according to the calculator and butt dyno is flat ride.

Bilstein B4
Eibach pro kit springs
Hotchkis F/R sways medium front, soft rear

Great comfort, bumps even with Hankook v12 (awful sidewalls) feel smooth, car turns in very well, and isnt unsettled at motion changes/apex bumps. Couldnt be happier, as it nearly feels my like old MCS setup. Ride height is fixed, but low enough where it looks OE+ but not low enough where its compromising the control arms/bushings.

What are you spring rates? Also, did you measure corner weights?

I went with a build directly built by FCM.

H&R street coilvers
450lb 6" f spring
800lbs 6" r spring
GC weighted jacks
GC front Sway bar stiffest setting
OE rear sway bar.

Will give some feed back as soon I get everything in and on the car.

Also curious if you measured your corner weights before FCM recommended spring rates? Were these spring rates aimed towards a sporty or more race focused setup?

[Cronenberged]

I went with a build directly built by FCM.

H&R street coilvers
450lb 6" f spring
800lbs 6" r spring
GC weighted jacks
GC front Sway bar stiffest setting
OE rear sway bar.

Will give some feed back as soon I get everything in and on the car.

[Chas3n]

For those on a budget, my current setup according to the calculator and butt dyno is flat ride.

Bilstein B4
Eibach pro kit springs
Hotchkis F/R sways medium front, soft rear

Great comfort, bumps even with Hankook v12 (awful sidewalls) feel smooth, car turns in very well, and isnt unsettled at motion changes/apex bumps. Couldnt be happier, as it nearly feels my like old MCS setup. Ride height is fixed, but low enough where it looks OE+ but not low enough where its compromising the control arms/bushings.

[r4dr]

Hmm, seems like you’re right.

well, something is different and I forget what, it seems. Whatever it is, the result is that the US cars need the strut spacer and the euro cars don’t.

Is this true for US cars regardless whether it's using stock top hats or camber plates?