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Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 08-09-2013, 06:27 AM   #1
Cavi Mike
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Lightbulb If you're curious what a non-M looks like with M3 lowering springs, stay tuned...

I just ordered a set of Tein S-Tech springs for the M3 - I own a 328Ci.

Few reasons why I chose these springs:
-Tein actually lists their spring rates
-M3 rates are a little higher than non-M
-Spring perches are the same between M and non-M

I know pretty much every advertisement says "M3 ONLY!!" or "SPORT SUSPENSION ONLY!!" etc etc. Well this thread proves that they are a lot more similar than any advertisement leads you to believe.

So, if anyone wants to know what happens when you put springs that are "M3 ONLY!!" in a non-M, keep an eye on this thread.

No, I haven't ordered shocks yet. If this little experiment proves unsuccessful, I'm going with some nice coilovers.
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Old 08-09-2013, 12:47 PM   #2
Llink78
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You will just sit a little higher so it won't lower as much. The m3 only compensates for the extra weight a M has. So putting even stock or aftermarket M suspention will have you sitting a little high.
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Old 08-09-2013, 11:57 PM   #3
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Reasonable theory - until you factor in the convertible. Non-M convertible weighs more (far more) than the M3 coupe. You also have to subtract added unsprung weight of the much larger, heavier wheel/tire combination of the M3.

Clearly the weight is not a factor.
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Old 08-10-2013, 12:10 AM   #4
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When you get this installed measure. I bet you will be higher than you think.
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Old 08-13-2013, 09:41 PM   #5
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Springs are here. Weather is looking good all week, I should get to it Thursday or Friday morning.
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Old 08-16-2013, 12:34 PM   #6
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Here's where the snag occurs in the front. The diameter of the M3 spring is too small to fit in the hat. The non-M spring is larger on one end and fits a specific way, the M3 spring is identical on either end. So, no, the M3 spring will not fit right out of the box.







Unfortunately I won't be able to get any comparisons in ride-height in the front. I'm still installing these springs - albeit with some modification - but this modification is going to net me 1/2" or more drop in the front.

Stay tuned for the rear.
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Old 08-16-2013, 12:51 PM   #7
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And that is how you make an M3 spring fit in a non-M hat.


Last edited by Cavi Mike; 08-16-2013 at 12:52 PM.
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Old 08-16-2013, 01:24 PM   #8
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Quote:
Originally Posted by Cavi Mike View Post
Here's where the snag occurs in the front. The diameter of the M3 spring is too small to fit in the hat. The non-M spring is larger on one end and fits a specific way, the M3 spring is identical on either end. So, no, the M3 spring will not fit right out of the box.







Unfortunately I won't be able to get any comparisons in ride-height in the front. I'm still installing these springs - albeit with some modification - but this modification is going to net me 1/2" or more drop in the front.

Stay tuned for the rear.
Quote:
Originally Posted by Cavi Mike View Post
And that is how you make an M3 spring fit in a non-M hat.

So modification is necessary to fit M3 springs. Good to know.
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Old 08-16-2013, 05:47 PM   #9
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Fronts have been done only.

Before:



After:

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Old 08-16-2013, 05:48 PM   #10
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Don't mind the red calipers - that's getting de-riced next. Anyone want some faux-M3 mirrors? hahaha
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Old 08-16-2013, 05:56 PM   #11
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If you're curious what a non-M looks like with M3 lowering springs, stay tuned.

My buddy zx5rider took tein coilovers off his 330 and put them on his M3.
Only the top mounts up front are different it seems.


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Old 08-16-2013, 06:06 PM   #12
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Wow congrats man. So the front would be a 1/2 inch higher if you didn't cut?
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Old 08-16-2013, 06:56 PM   #13
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At first I thought I was gonna need to cut a whole coil, but half a coil was enough, so I doubt it's even 1/2" difference. Prolly the difference between running spring pads or not.
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Old 08-16-2013, 07:25 PM   #14
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Hmm, so to fit M3 springs to non-M struts, you need to either cut the springs or buy the M3 strut and strut mount combo. I never tested that or tried that out when I made my thread.

Good to know they can fit and don't raise the front of the car significantly.
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Old 08-22-2013, 09:18 AM   #15
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They didn't raise the car, they lowered the front at least 1-1/2" but I just did the back and the drop is barely noticeable, maybe 1/2". Over time I'm sure it will settle a little bit but they definitely lowered the car, not raise it.

All 4 Tein M3 springs in, with all spring pads as well.


Bilstein short-strokes are next.

Last edited by Cavi Mike; 08-22-2013 at 09:19 AM.
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Old 08-24-2013, 08:59 PM   #16
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I feel like my car sits lower than that on non-m Tein S Techs
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| BB Gen 3 Headers | Cosmos Racing V2 CAI | Muffler Delete | RE Underdrive Pulleys |
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Old 08-25-2013, 01:25 AM   #17
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That's very possible. I explained in the OP why I went with the M3 version over the non-M.
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Old 08-27-2013, 04:53 AM   #18
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Drop it like it's hot. Very nice.
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Old 10-02-2013, 11:50 AM   #19
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Now what if i was doing the absolute opposite of what you're doing... I have a non-m sedan lowered on Tein-S tech springs with blown out non m shocks/struts (my car sits really low cause of this). From research, I can use m3 rear shocks as a direct fitment into a non-m. How would i go about doing the front? is it a direct swap? I have seen some people saying that i can use the m3 front suspension, i would just need to change out the top hats as well.
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