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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > new engine strut brace



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      06-23-2006, 04:31 PM   #1
longtran
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new engine strut brace

found it on ebay. looks good. http://cgi.ebay.com/ebaymotors/2006-...00866954QQrdZ1




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      06-24-2006, 07:28 AM   #2
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yah..i made offer on this already and waiting to hear back from seller...
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      06-24-2006, 01:15 PM   #3
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can someone teach me about this??.....How can you tell a strut bar is properly engineered just by the way they look ??
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      06-24-2006, 01:25 PM   #4
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is this oem? you kno the other one? uhh

http://cgi.ebay.com/ebaymotors/BMW-E...5604QQtcZphoto

how do they compare?
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      06-24-2006, 01:27 PM   #5
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oh yeah and forgot to ask. how come it only says 325? it should fit on the 330 right? (haha im a dumbass )
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      06-24-2006, 01:29 PM   #6
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Quote:
Originally Posted by just4kickz
is this oem? you kno the other one? uhh

http://cgi.ebay.com/ebaymotors/BMW-E...5604QQtcZphoto

how do they compare?
yes it is oem, this is the first time i have seen the other one so i doubt any really knows how they'd comepare, it looks cool though, whos it made by????
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      06-24-2006, 01:53 PM   #7
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Hey Mr. DIY why don’t you just make one of those? You have the machine right? It shouldn’t be too hard to do.
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      06-24-2006, 02:17 PM   #8
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long, it's hard to judge from the photos, but those bolts/screws at the attachment points look a bit small and chintzy. And are those phillips screws? Very much not BMW-like. BMW always uses Torx.
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      06-24-2006, 02:18 PM   #9
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Quote:
Originally Posted by LWL
can someone teach me about this??.....How can you tell a strut bar is properly engineered just by the way they look ??
E,
See post #45 on page 3 of my thread:
http://e90post.com/forums/showthread...ighlight=vs-xx

I don't think my car would have been this stiff without the strut bar. Floor jack placed under rear lift point only.


Close-up of front tire off ground:
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      06-24-2006, 02:25 PM   #10
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Quote:
Originally Posted by ksfrogman
E,
See post #45 on page 3 of my thread:
http://e90post.com/forums/showthread...ighlight=vs-xx

I don't think my car would have been this stiff without the strut bar. Floor jack placed under rear lift point only.
I mean, I know the purpose of a strut bar, but, for these no brand no name strut bar, how can I tell it work as some as OEM or ACS, which I trust their products. Some people might say its just a bar that hold the car together better, but, how do i know if these no brand aftermarket ones works well?? so it leads to my previous question that, how can I tell its not just a random bar, but its a carefully engineered struct bar??
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      06-24-2006, 02:53 PM   #11
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Quote:
Originally Posted by LWL
I mean, I know the purpose of a strut bar, but, for these no brand no name strut bar, how can I tell it work as some as OEM or ACS, which I trust their products. Some people might say its just a bar that hold the car together better, but, how do i know if these no brand aftermarket ones works well?? so it leads to my previous question that, how can I tell its not just a random bar, but its a carefully engineered struct bar??
I think some important things to consider are:
*The rigidity of the material used and the design of the bar.
*Strength of the pivot points
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      06-24-2006, 03:04 PM   #12
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Okay, here's my simplistic take on the strut bar issue. Remember Newton's Third Law:

"For every action, there is an equal and opposite reaction."

Now imagine that you are looking at your engine bay from the top without the hood. The strut bar towers can be seen from above. Pretend that the O's are the front strut towers.

O......O

and by bracing those towers together, we are minimizing body flex by preventing inward displacement:

-->O....O<--

and outward displacement:

<--O.........O-->

Now I know I haven't answered your question yet, Elaine, because I know you know all of this already.

Now if you were to weld and attach both strut towers together with straight 4130 chrome moly tubing, you would effectively prevent the body from flexing inwardly and outwardly, right?

The problem is that the engine is in the way, so you must put a bend in the tube. So the next questions you may ask yourself are "how rigid is the strut brace?" and "how would bending the bar affect rigidity?"

More importantly, it is not practical to weld a solid piece to the strut towers, so we must be able to attach and detach the strut bar. So now look at the attachment points. You'll have to agree that these are the potentially weak points of the design. The OEM strut bar that Long and I have utilize fairly thick (I believe they are 8mm) bolts with hexagonal heads and/or torx. However, the bar is hollow (good for being light). The design seen in this thread seems to use solid aluminum, but it's in three pieces. I would be most concerned about the bolts that are used to attach them. Will they loosen in time with body flex?
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      06-24-2006, 03:07 PM   #13
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sorry michael....but i got a C+ in physics class in college.....

btw...long, did you buy one?
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      06-24-2006, 03:39 PM   #14
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haha when in doubt just buy it and say its eye candy.
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      06-24-2006, 04:18 PM   #15
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Man that thing is sick
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      06-24-2006, 04:28 PM   #16
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yo Frogman,

did you ever try that without the stress bar???

I haven't, but on my Z4 I get the same effect with no mods (I know it's smaller..... ) but just curious??

I bet you'd be able to get the same effect (front wheel lifting) without the bar
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      06-24-2006, 04:35 PM   #17
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Quote:
Originally Posted by ksfrogman
Okay, here's my simplistic take on the strut bar issue. Remember Newton's Third Law:

"For every action, there is an equal and opposite reaction."

Now imagine that you are looking at your engine bay from the top without the hood. The strut bar towers can be seen from above. Pretend that the O's are the front strut towers.

O......O

and by bracing those towers together, we are minimizing body flex by preventing inward displacement:

-->O....O<--

and outward displacement:

<--O.........O-->

Now I know I haven't answered your question yet, Elaine, because I know you know all of this already.

Now if you were to weld and attach both strut towers together with straight 4130 chrome moly tubing, you would effectively prevent the body from flexing inwardly and outwardly, right?

The problem is that the engine is in the way, so you must put a bend in the tube. So the next questions you may ask yourself are "how rigid is the strut brace?" and "how would bending the bar affect rigidity?"

More importantly, it is not practical to weld a solid piece to the strut towers, so we must be able to attach and detach the strut bar. So now look at the attachment points. You'll have to agree that these are the potentially weak points of the design. The OEM strut bar that Long and I have utilize fairly thick (I believe they are 8mm) bolts with hexagonal heads and/or torx. However, the bar is hollow (good for being light). The design seen in this thread seems to use solid aluminum, but it's in three pieces. I would be most concerned about the bolts that are used to attach them. Will they loosen in time with body flex?
hahaha........ you really explain the question in detail. Thanks.
Anyone wants to try it and let us know??
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      06-24-2006, 04:43 PM   #18
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Quote:
Originally Posted by LWL
Anyone wants to try it and let us know??
i'm gonna wait til there's a groupbuy.....

or someone offers it for a lot cheaper.....

everytime i buy something.....2 weeks later....it's like 25% cheaper!
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      06-24-2006, 05:35 PM   #19
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rash decisions natureboy, rash decisions.
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      06-25-2006, 02:44 AM   #20
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Quote:
Originally Posted by ward
yo Frogman,

did you ever try that without the stress bar???

I haven't, but on my Z4 I get the same effect with no mods (I know it's smaller..... ) but just curious??

I bet you'd be able to get the same effect (front wheel lifting) without the bar
This would be a good question for Long to answer. He's jacked up his car and changed the wheels more times than I have washed my car. I have never seen the front wheel come off the ground almost exactly the same distance as the rear wheel. The stiffness of the car is like night and day post-sway bar and strut bar when going up a steep driveway or across a speed bump diagonally.
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      06-25-2006, 03:41 AM   #21
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Went to my dealership today for an oil filter which they did not have but noticed the Strut bar from Dinan on the wall. I think the car is stiff enough and doesn't need it but I guess we have some people that likes more stiffness.
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      06-26-2006, 05:24 PM   #22
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email the guy and this is what he said" This is not original part for BMW, however, the manufacture do make this part for BMW in ASia."
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