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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 Mon, Jul-23-2018, 02:36:13 PM   #21
Joshe46
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by twentyseven View Post
So does the spring float in midair or does the rear height adjuster sit on the perch? More pounds per square inch spread out on a smaller area.


The rear height adjuster sits on the perch. And since it threads through the perch, its only on the raised portion. Sounds like its even worse for the perch!
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Old Mon, Jul-23-2018, 02:38:20 PM   #22
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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
The rear height adjuster sits on the perch. And since it threads through the perch, its only on the raised portion. Sounds like its even worse for the perch!
Indeed it is - most suspension kits will actually come with reinforcement plates for that reason

http://m3forum.net/m3forum/showthread.php?t=530583
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Old Mon, Jul-23-2018, 02:45:49 PM   #23
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by Drewster View Post
Indeed it is - most suspension kits will actually come with reinforcement plates for that reason

http://m3forum.net/m3forum/showthread.php?t=530583


So would the RE plate help me at all? Or am I just kind of screwed here? Looks like that idea in the thread you linked never took off.
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Old Mon, Jul-23-2018, 04:01:25 PM   #24
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Default Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by Joshe46 View Post
So would the RE plate help me at all? Or am I just kind of screwed here? Looks like that idea in the thread you linked never took off.

I highly suggest the RE reinforcement plates.

Before and After.





Underneath

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Build Thread - S54 Vanos Thread

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Last edited by WOLFN8TR; Mon, Jul-23-2018 at 04:51:49 PM.
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Old Mon, Jul-23-2018, 04:04:08 PM   #25
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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 highly suggest the RE reinforcement plates.

Before and After.





Wait a second, why does my adjuster not sit like yours? My threaded tube doesnt make contact with the perch like that.
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Old Mon, Jul-23-2018, 05:50:24 PM   #26
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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
Wait a second, why does my adjuster not sit like yours? My threaded tube doesnt make contact with the perch like that.
With stiffer rates, you need rear reinforcement plates as well as the front ones (front strut towers can mushroom).

What do yours look like in the back?

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All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

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Old Mon, Jul-23-2018, 06:00:48 PM   #27
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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
Wait a second, why does my adjuster not sit like yours? My threaded tube doesnt make contact with the perch like that.
Really? Post up some pics.
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TTFS Engine/SMG Tune - SGT Headers/Sect 1/SCZA - Evolve Eventuri
VIS XTS CF Hood - CF Lip/Console/Diffuser - OE CSL Trunk - BWS 500S 9k/11k
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Old Mon, Jul-23-2018, 06:05:58 PM   #28
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

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Originally Posted by mrgizmo04 View Post
With stiffer rates, you need rear reinforcement plates as well as the front ones (front strut towers can mushroom).

What do yours look like in the back?

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I have both front and rear reinforcement plates. Just not spring perch. But Once I get home from work Ill grab some pics!
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Old Mon, Jul-23-2018, 06:06:31 PM   #29
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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
Really? Post up some pics.


Will do once I get home from work!
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Old Mon, Jul-23-2018, 06:10:51 PM   #30
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Default Re: Do Stiff spring rates have correlation to subframe cracks?

Maybe your springs are of stock length and not adjustable. Either way, when you get home, post some pics so we can see.


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All DIY: 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, WPC rod bearings, Beyer driveshaft, full SS (SS stepped V1, catted S1, resonated S2, SS sport), Sachs clutch/flywheel, rear main, VANOS bullet proofing with anti-rattle, valve adjustment, cooling refresh, Ohlins R&T/Swift 448f 672r/GC street tops and camber plates, AFD E85 Proflex kit.

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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)