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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, Jul-19-2018, 05:27:20 PM   #1
Joshe46
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Default Do Stiff spring rates have correlation to subframe cracks?

Hey all,
So this has been on my mind for a little while now and giving me some worry about my m3. So I currently am running Broadway static coilovers in a 16k- 18k spring setup. Now let me say that I chose this setup when I had a more garage queen/ show setup in mind. Now I have grown up and ditched my wide wheels and am running 18x 10 square enkei nt03s with r888 all around and I love it. Even on the stiff coils car drives great. Car is still only a weekend warrior and doesnít see daily driving. However being still on these very stiff springs I worry Im doing damage to my m3. I have the subframe reinforcement, front and rear shock tower reinforcements. But still is there any reason these stiff rates will put more wear and tear on things such as my subframe? Or am I overthinking? Part of me wants to sell and go with more track oriented coils, but I also cannot really allow myself to spend that amount currently.
Any thoughts guys? I know some guys that run these very stiff rates and certainly spiritually drive their m3s. Id love to hear youíre thoughts.
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Old Thu, Jul-19-2018, 05:28:52 PM   #2
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

No, plenty of dirty bone stock e46s rolling around on soft progressive stock springs with cracks galore.
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/// 2004 SilberGrau M3 ∑ Coupe ∑ 6MT ∑ slicktop ∑ manual seats ∑ zero options ∑ JOURNAL
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Old Thu, Jul-19-2018, 05:35:51 PM   #3
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by Joshe46 View Post

Part of me wants to sell and go with more track oriented coils, but I also cannot really allow myself to spend that amount currently.
Springs are not the cause.

Keep your current coilovers. Don't buy track-focused coilovers until you:

1. Start going to the track
2. Keep going to the track
3. Keep going to the track more
4. Reach a point in your track experience that your current coilovers are actually an issue on the track (which I give ~1% chance)
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Old Thu, Jul-19-2018, 05:37:49 PM   #4
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

You are running 900 lb/in and 1000 lb/in rate springs? Is the car on slicks and aero and track only?
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Old Thu, Jul-19-2018, 05:40:21 PM   #5
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by lmtfi View Post
Springs are not the cause.



Keep your current coilovers. Don't buy track-focused coilovers until you:



1. Start going to the track

2. Keep going to the track

3. Keep going to the track more

4. Reach a point in your track experience that your current coilovers are actually an issue on the track (which I give ~1% chance)


Thatís what I like to hear. Ill head over to the autobahn soon enough!
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Old Thu, Jul-19-2018, 05:40:58 PM   #6
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by CrookedCommie View Post
You are running 900 lb/in and 1000 lb/in rate springs? Is the car on slicks and aero and track only?

R888 are about as close to slicks as it gets! Lol. Yes I know they are way overkill
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Old Thu, Jul-19-2018, 05:42:07 PM   #7
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Default Do Stiff spring rates have correlation to subframe cracks?

I have the Broadway Static 500’s with 5” springs 11k F & 15k R and it rode decent. I wanted a softer ride beings it’s my DD and moved the 5” 11k to the rear and bought a 6” 9k for the front. What a difference it made! The damper valving wasn’t changed for the softer springs and it works great. Was at 616/840 now I’m at 504/616.
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Last edited by WOLFN8TR; Thu, Jul-19-2018 at 09:36:15 PM.
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Old Thu, Jul-19-2018, 05:55:06 PM   #8
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by WOLFN8TR View Post
I have the Broadway Static 500ís with 5Ē springs 11k F & 15k R and it road decent. I wanted a softer ride beings itís my DD and moved the 5Ē 11k to the rear and bought a 6Ē 9k for the front. What a difference it made! The damper valving wasnít changed for the softer springs and it works great. Was at 616/840 now Iím at 504/616.


So sounds like its more of a if I can bare them. Because how often I drive the car and being young I can tolerate them pretty well haha. As you know Broadways are amazing coilovers.
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Old Thu, Jul-19-2018, 06:15:00 PM   #9
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

I hear ya. I probably wouldnít of even changed mine either but with the wife and kid in the car itís nice to have a more comfortable ride.

You could always do what I did. Move the 16k to the rear and get a 12k for the front.
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VIS XTS CF Hood - CF Lip/Console/Diffuser - OE CSL Trunk - Turner Spacers 15/12 - BWS 500S 9k/11k
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Old Thu, Jul-19-2018, 06:43:01 PM   #10
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by WOLFN8TR View Post
I hear ya. I probably wouldnít of even changed mine either but with the wife and kid in the car itís nice to have a more comfortable ride.

You could always do what I did. Move the 16k to the rear and get a 12k for the front.


Thatís understandable! True I could but honestly now that my mind is at ease that my springs arenít ruining my car, Im totally fine with how they ride!
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Discussing Do Stiff spring rates have correlation to subframe cracks? 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)