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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 Wed, Aug-14-2019, 02:19:29 PM   #31
Zzyzx85
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Default Re: JRZ Install Help

For street usage, I think preload is a nice to have but not necessary. I don't think I've ever experienced full droop on my front suspension while driving on public roads.
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Old Wed, Aug-14-2019, 02:37:55 PM   #32
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Default Re: JRZ Install Help

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Originally Posted by Zzyzx85 View Post
For street usage, I think preload is a nice to have but not necessary. I don't think I've ever experienced full droop on my front suspension while driving on public roads.
Not in my M3, but in a different car I did, and it sucked-lol
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Old Wed, Aug-14-2019, 02:41:08 PM   #33
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Default Re: JRZ Install Help

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Whuuuuuut!? Thatís counter to everything Iíve heard and read. I had an adj. collar come loose once on one of my other vehicles, and it made this horrendous racket every time I hit a bump or abrupt dip in the road-lol. Even so, it appears that the collar would have to be almost completely at the bottom to achieve the ride height Iím looking for...something just doesnít feel right here.
On my front suspension I use the helper spring so I do end up having preload. So I can't comment on my experience with no preloads on the front. However on my rear at full droop the spring is *totally* loose and I never reach full droop in the rear on the street. When first lowering the car you'll hear some nasty noises as the springs settle but once you drive it for a few miles it should be ok.

Full disclosure, this is on my dedicated track car. I only drive it on the street on the weekends.
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Old Wed, Aug-14-2019, 02:44:10 PM   #34
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Default Re: JRZ Install Help

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Right, but if I loosen the collar any further, there will be zero preload on the spring assembly. Am I crazy in thinking that there has to be a minimum amount of preload to account for possible unloading situations-lol.
Yea you can have slack, itíll never unload unless youíre getting serious air on the track.
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Old Wed, Aug-14-2019, 02:46:32 PM   #35
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Default Re: JRZ Install Help

You could try a longer softer rate?
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Old Wed, Aug-14-2019, 02:54:14 PM   #36
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Default Re: JRZ Install Help

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On my front suspension I use the helper spring so I do end up having preload. So I can't comment on my experience with no preloads on the front. However on my rear at full droop the spring is *totally* loose and I never reach full droop in the rear on the street. When first lowering the car you'll hear some nasty noises as the springs settle but once you drive it for a few miles it should be ok.

Full disclosure, this is on my dedicated track car. I only drive it on the street on the weekends.
Yep, the rears are completely unloaded at full droop as well...this is not uncommon. However, I've never had to run the fronts in an unloaded state on any of my previous c/o set ups on this car or others...it was never necessary or desirable...so I thought.

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Yea you can have slack, it’ll never unload unless you’re getting serious air on the track.
Ok, maybe I am that stupid, and learning something new...see you're never too old I guess-lol.
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Old Wed, Aug-14-2019, 02:54:58 PM   #37
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Default Re: JRZ Install Help

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You could try a longer softer rate?
Yep, I think that might have the desired effect as well?

EDIT: ...or if I just ran the thinner race plates, that should resolve it as well...but I don't want to run race plates-lol.
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Old Wed, Aug-14-2019, 03:02:48 PM   #38
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Default Re: JRZ Install Help

Before you do anything why not lower the collar and go for a short drive, you should be fine. The only time mine unloads is when it’s on stands. I’m sure they specd the piston for the amount of threads available.
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Old Wed, Aug-14-2019, 03:16:36 PM   #39
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Default Re: JRZ Install Help

To your earlier question about rates 250lbs apart making a difference in height - yes! I went from 440lb to 300lb, so only 140lb spread, and it was significant enough, about 3/8".

If you had something like 400 up front, you'd be fine with the street plates I bet. 600lb front springs makes more sense with race plates as those rates are race car rates
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Old Wed, Aug-14-2019, 03:33:30 PM   #40
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Default Re: JRZ Install Help

Yep, that's what I was going to post-- if you're planning to go to softer springs anyway, that should kill two birds with one stone. Get a softer spring of the same length and you'll be lower at the same setting.

... I drove my car for over a decade with slop at full droop with no ill effects other than noises when I jacked and jacked the car. But, I didn't have a helper spring at the time-- I could see that making it get misaligned.
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Discussing JRZ Install Help 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)