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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Robbing the e92 M3 for suspension parts



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      10-09-2008, 07:40 PM   #23
Malek@MRF
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Quote:
Originally Posted by Mooreski View Post
Interesting thread..... let me add a noon question to it:

The M3 has flared fenders, which I always thought was to accommodate a wider track. Where does the wider track come from? The suspension or just wheel width and offset?

From this conversation I'm guessing it's from the wheels since it sounds like the suspension is the same regarding control arm lengths and such.
I this specific M3 (E92), the widened track in the front comes from the wheel offsets and widths.

The rear, I think is ever so slightly wider. Its not that important.
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      10-09-2008, 08:45 PM   #24
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I'm surprised that Harold from HP Autowerkes hasn't chimed in yet.
He was very happy with his.

If you go to the realoem page, you will find that you need a handfull of parts but it does and will fit as long as you ordered everything needed.
I also confirmed it with Evan at Tischer since I was thinking about doing this.
The only reason why I didn't was due to the Performance brace that I picked up.

I probably would have gone this direction otherwise.
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      10-09-2008, 08:49 PM   #25
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Quote:
Originally Posted by Gen_E92 View Post
Could you elaborate more on that? very curious about this since I just installed the JIC one.
I hate to tell you this but the JIC is acting like a spring in tension due to the bends. It is not doing a lot.

If you could start at ground zero for a design then the M3 brace is what you want. It is a triangle in that ties in the L shape of the firewall and short as well.

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      10-09-2008, 09:19 PM   #26
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I got some more interesting stuff to come. I have been busy correcting the KW v3 with yet another set of new spring and modified camber plate. The KW camber plates are very well design and have 7300 PSI axial load limit spherical bearing. The design also uses a separate thrust bearings which are noise resistance. The KW camber plate stack height was off a lot so after testing the isolator. I recalculated the proper nominal stack height that accounts for the isolator deflection. I also reclaimed 5 mm of suspension travel that was lost. This was all so important to getting the right ride height and spring preload. These plates have 0.7 degrees of addition caster built in so I will be running 7.9 degrees caster.

A few pictures of the 2nd iteration of the camber plate modifications. I haven’t put the studs in yet as I just picked them up. I post more in another thread when I finished testing the new setup and bushings.

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Last edited by Orb; 11-25-2011 at 01:09 PM.
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      10-09-2008, 10:06 PM   #27
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Quote:
Originally Posted by Malekreza11 View Post
I am glad you are mentioning this and putting it out for the public to see Orb. I went to the dealer recently to look at the suspension components for the M3, and aside a very few minor differences, its all the same.. There are a few things that look different and have the "M" stamp on them, but they are no different than the 335's components. It seems like BMW just redid the part in a different material just because its an M.

The front end is basically the same as you mentioned. Someone also mentioned the front hub spindles are different, and they are, but its not an advantageous difference aside from a very minor difference in unsprung weight. Due to the spindle difference, the caliper is mounted a little lower than the 335's caliper, but its a negligible difference as far as COG and gain go.
The dealership dude was looking at me like, wtf is he doing. Haha.

Great info nonetheless bro and great job!

I wonder when Dtec will release a bushing set for the E9x's. They make some good custom stuff as far as bushings go.
I'm not sure it would be worth doing any other bushing on this car as the other ones are the same as the M3. If you go with really stiff race spring then it might be worth it but it is better to balance out the system. To stiff of bushings and the car with resonate all over the body which will be a function of spring rate as well. It is best to be safe and do a modest upgrade.

The rubber strut top mounts need to go. The for and aft movement in these have large deflections as well and with the combination of the stock lower control arm mean huge under steer when pushed hard. I am finally on the last leg of the road getting this best to handle at the track.

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      10-10-2008, 12:53 PM   #28
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Quote:
Originally Posted by Suareezay View Post
so the bushings are for the rear only? can you have them pressed into your stock rear arms or do you need to purchase new ones?
Thats the conclusion I have come to believe after reading Orb's post. 4 bushings in the rear; two for the front of the subframe, and two for the rear of the subframe.

which parts do i need for to make the m3 strut bar work on the 335?
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      10-11-2008, 04:41 PM   #29
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Can i get the part numbers for E90?
Can E90 M3 parts transfer to E90 335i?
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      10-11-2008, 08:02 PM   #30
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Quote:
Originally Posted by hsppsh View Post
Can i get the part numbers for E90?
Can E90 M3 parts transfer to E90 335i?
Here's what I ordered (from an E90 M3):

51-617-900-821 ring strut tower brace left
51-617-900-822 ring strut tower brace right
51-618-044-553 strut brace x2
51-618-045-860 mount for brace
51-618-046-445 stud x2
51-717-898-374 stud x4
07-119-904-401 hex bolt x2
07-146-954-965 ASA bolt w/ circlip
07-146-963-730 torx bolt x2
51-717-895-241 hex nut x6
31-316-769-731 self locking collar nut x6
51-617-891-281 cover cap x2

Hopefully this helps.
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      10-11-2008, 08:26 PM   #31
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Quote:
Originally Posted by shyestsparks View Post
Here's what I ordered (from an E90 M3):

51-617-900-821 ring strut tower brace left
51-617-900-822 ring strut tower brace right
51-618-044-553 strut brace x2
51-618-045-860 mount for brace
51-618-046-445 stud x2
51-717-898-374 stud x4
07-119-904-401 hex bolt x2
07-146-954-965 ASA bolt w/ circlip
07-146-963-730 torx bolt x2
51-717-895-241 hex nut x6
31-316-769-731 self locking collar nut x6
51-617-891-281 cover cap x2

Hopefully this helps.
Thanks for the help.
Are these just for the strut bar?
Are there any M3 suspension parts that are able to transfer?
Thanks again.
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      10-11-2008, 10:36 PM   #32
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Quote:
Originally Posted by shyestsparks View Post
Here's what I ordered (from an E90 M3):

51-617-900-821 ring strut tower brace left
51-617-900-822 ring strut tower brace right
51-618-044-553 strut brace x2
51-618-045-860 mount for brace
51-618-046-445 stud x2
51-717-898-374 stud x4
07-119-904-401 hex bolt x2
07-146-954-965 ASA bolt w/ circlip
07-146-963-730 torx bolt x2
51-717-895-241 hex nut x6
31-316-769-731 self locking collar nut x6
51-617-891-281 cover cap x2

Hopefully this helps.
If u ordered these at the dealership how much was all this?
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      10-12-2008, 03:26 AM   #33
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Quote:
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If u ordered these at the dealership how much was all this?
About 300.
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      10-12-2008, 10:07 AM   #34
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What will I notice if I do this? Im a bit lost in all this.
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      10-12-2008, 12:34 PM   #35
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the chassis should be stiffer side to side and the front sohuld turn in better, I believe

also I had my bulk head covers and filters off just over the weekend and decided to check out the V mounting point for the strut towers and didn't really see an easy way to access it? There were a few silver bolts that seemed to hold the stock one onto the firewall, am I supposed to undo these to get access? That would put me underneath the front windshield
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      10-12-2008, 07:06 PM   #36
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what do u guys think of this suspension upgrade:

Front control arms & Rear sub-frame parts Orb posted

M3 strut bar

M sport rear sway bar

ST coilovers

My main goal is to have better control, firmer ride (not too floaty), lesser body roll and improved handling in and out of turns. Or you can just say i wanna do 60 mph on a 35 mph turn easily with a big smile on my face
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      10-12-2008, 08:59 PM   #37
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Wow this is really eye opening thread. It's amazing the weaknesses you discover once you start pushing the car beyond stock levels. I've got a 325 e90 and was planning on upgrading. I can already feel the thrust arm bushings loosening up and I'm sure the other bushings and mount will start to go soon as well.
I just hope there isn't too much difference between the e90 325 zsp and m3.

--Marcelo
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      10-12-2008, 10:19 PM   #38
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Quote:
Originally Posted by ironic View Post
the chassis should be stiffer side to side and the front sohuld turn in better, I believe
Oh, so thats the side to side squishiness I feel. I didnt feel it at first, but its getting pretty pronounced now. I just thought it was tires wearing out and the lack of upgraded sways.
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      10-12-2008, 10:57 PM   #39
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I have a hard time following these. Can someone please summary what E90 should order? Bushing and not wishbone right?
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      10-13-2008, 01:21 PM   #40
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Quote:
Originally Posted by Orb View Post
The control arms are 100.00 each and the rear bushing are 40.00 each. Use the part numbers i listed in the first post.

Orb
From what I get, you don't need the M3 control arms just the bushings?
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      10-13-2008, 01:25 PM   #41
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Wishbone = control arms ? ? Right
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      10-13-2008, 02:00 PM   #42
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Quote:
Originally Posted by BMW_TT View Post
From what I get, you don't need the M3 control arms just the bushings?
Quote:
Originally Posted by Josephkao View Post
Wishbone = control arms ? ? Right

You need the M3 control arms, which have the bushings installed already.

Lower wishbone on the M3 / 335i = control arms
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      10-13-2008, 02:05 PM   #43
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Quote:
Originally Posted by E92Fan View Post
You need the M3 control arms, which have the bushings installed already.

Lower wishbone on the M3 / 335i = control arms
I thought the LCA on the M3 and 335i were the same? Are the Bushing size different or just harder?
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      10-13-2008, 02:10 PM   #44
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Can someone confirm if these are all the parts that I need for E90.

Front control arms:

• WISHBONE, LEFT - 31102283577 - Qty 1 Price on Tischer is about $90@
• WISHBONE, RIGHT – 31102283578 - Qty 1

Rear sub-frame:

• RUBBER MOUNTING FRONT – 33312283382 - Qty 2 Price on Tischer is about $60@
• RUBBER MOUNTING REAR – 33312283383 - Qty 2

Is there anyone have installed this parts. Please do a review.....................
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