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

[mrgizmo04]

FWIW, Ohlins comes with a 8" 400 front spring and that provides almost an inch drop with stock front mounts.

If you try running a 350 7" spring at 13.5 ride height, you will be almost at the very top of adjustment threads on the collar after preloading the spring appropriately (ride height and spring preload same adjuster).

I tried a 336 7" spring and could not get it to more than barely above 13.25 after maxing out the adjustment collar/preload. The tire rubbed.

Rears at 628 I believe are 6" long (they might be 5", ill need to check).

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[lvm3sm46]

From what I've seen and experienced, 8" is for stock rate like 143lb up to like 200. Once around 300-400, 7" is good. Then after 400lb 6" is ok, especially if you get the extra travel type.

You won't have to worry about rubbing the spring perch with linear springs and those wheels.

This is golden information. I'll give 7" a try and will definitely report back.

tried 7" and maxed out only can get 12.75" from fender to hub center. So these dont work. 8" it will have to be

[Tbonem3]

IMO, using stock mounts defeats a very useful feature of aftermarket coilovers/plates for us - reducing ride height for free through reduction of stack height in camber plates from GC, Vorshlag, TMS and probably others.

If you just want stock like height (14"+) then you'll have plenty of travel I suppose.

[r4dr]

Would Ohlins with a 300# front spring both L&R and stock Ohlins rear at 630# in the rear L&R with Turner bar at soft which gives me 74.4 L&R FRC and bounce frequency of 1.10 L&R be a good starting point to try Flat Ride?

Funny, this is the exact setup I'm going to go with, and I had the same question about spring length. Undecided on if I'll go Turner Street plates or stock mounts (swapped L to R) with these Turner 2.5" perch adapters.

[maupineda]

What length springs up front should be used? 7" or 8" or 7.5" vogtland?

at those rates, 8 would not work. I am at a much milder rate and at lowest setting I am at 610mm from the wheel to the fender edge.

[Obioban]

^agreed

[Tbonem3]

From what I've seen and experienced, 8" is for stock rate like 143lb up to like 200. Once around 300-400, 7" is good. Then after 400lb 6" is ok, especially if you get the extra travel type.

You won't have to worry about rubbing the spring perch with linear springs and those wheels.

[lvm3sm46]

I planned on Turner street plates but I am open to suggestions.

I also plan to run a 9.5 wide +35 wheel squares with 265's

[Obioban]

This will be a complete new setup from struts/shocks too springs. So I have no data to go off of besides what I read from your posts on some others.

What camber plates are you using?

[lvm3sm46]

This will be a complete new setup from struts/shocks too springs. So I have no data to go off of besides what I read from your posts on some others.

[Obioban]

What length springs up front should be used? 7" or 8" or 7.5" vogtland?

That depends on a lot of things :P

How long and how stiff is your current spring? Where is it on it's adjuster range, and are you at your future desired ride height?

[lvm3sm46]

What length springs up front should be used? 7" or 8" or 7.5" vogtland?

[Obioban]

Would Ohlins with a 300# front spring both L&R and stock Ohlins rear at 630# in the rear L&R with Turner bar at soft which gives me 74.4 L&R FRC and bounce frequency of 1.10 L&R be a good starting point to try Flat Ride?

Yes.

[lvm3sm46]

Would Ohlins with a 300# front spring both L&R and stock Ohlins rear at 630# in the rear L&R with Turner bar at soft which gives me 74.4 L&R FRC and bounce frequency of 1.10 L&R be a good starting point to try Flat Ride?

[K-Dawg]

Shaikh, effects of high damper gas pressure ('jerk')

Is the gas pressure article still available somewhere?

https://web.archive.org/web/20190219100658/http://www.m3forum.net/m3forum/showpost.php?p=1067876267&postcount=60