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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Anyone Lowered the Front Via Strut Clevis?



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      06-29-2017, 11:45 AM   #67
feuer
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Quote:
Originally Posted by YoungBlood View Post
to make the reinforcement plate fit over the top, I'd have to cut a portion of it out, because of where the strut brake bolt on. That area is also probably part of the reason e90 can get away without it though
Can you post a photo from your setup?
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      06-29-2017, 12:14 PM   #68
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Quote:
Originally Posted by feuer View Post
Can you post a photo from your setup?
I haven't done it yet, I just was meaning, if I was going to place the reinforcement plate over the top of the strut tower, I would have to trim a portion to allow it to seat over the strut bolts, since the brace is in the way
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      06-29-2017, 12:26 PM   #69
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Quote:
Originally Posted by YoungBlood View Post
I haven't done it yet, I just was meaning, if I was going to place the reinforcement plate over the top of the strut tower, I would have to trim a portion to allow it to seat over the strut bolts, since the brace is in the way
Reinforcement would work only if is on the bottom, sandwiched between the strut tower and the strut mount. Above, on top, you can mount strut bar but that serves different purpose, it isn't a strut tower reinforcement.
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      06-30-2017, 02:14 PM   #70
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2009 E90 328i  [5.00]
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Originally Posted by freedomfries View Post
Can't believe I missed this thread. I've been looking for a way to lower my front end a tiny bit and this is perfect. I don't think I'll have any clearance issues with my 284 wheels (17x8, ET34) with 12mm spacers and 225/45R17 tires on non-Sport suspension

And approved by Chris and Feuer? Say no more.
I went ahead with this mod and it was very easy to do.


Here is the RHS tab. You can see where I started cutting.


I cut the tab off flush with the weld. I just used a hacksaw with a bimetal blade (18 TPI).


Remove the 18mm pinch bolt (torque spec is 60 ftlb) and spread the knuckle with a prybar or chisel. Jack the knuckle and strut assembly up and the spring should push the strut further into the knuckle. If not, spread the knuckle further and gave it a few wacks with a hammer.


The tab is about 8mm tall.


I also took this opportunity to "bypass" my brake pad sensor to avoid future headaches.


My 2009 E90 328i AT has non-Sport suspension (C5 front springs) and the stock ride height in the front was 66cm with a full tank of gas. After the modification, my ride height decreased to 65cm and the stance doesn't look raked anymore. Very happy with the results.

Big thanks to the OP and everyone else!

Last edited by freedomfries; 08-06-2017 at 11:26 AM.
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      07-01-2017, 08:25 PM   #71
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Awesome! I still haven't gotten around to doing mine, realized I need new tension arm bushings, and decided to go full m3 arms and overhaul all my suspension while I'm at it, so no point in pulling it all apart twice
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      07-01-2017, 11:45 PM   #72
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Is this safe to reverse it if need be??

I mean, if you cut the tab and you want to go back to the stock position, would the pinch bolt be enough to hold it in position??
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      07-02-2017, 06:32 PM   #73
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Quote:
Originally Posted by P14kle View Post
Is this safe to reverse it if need be??

I mean, if you cut the tab and you want to go back to the stock position, would the pinch bolt be enough to hold it in position??
The pinch bolt would probably be strong enough to hold it until you hit the first pothole.

Reversing this mod would mean installing new front struts - but that's not necessarily a bad thing.

If you're considering this mod, I'd recommend doing it on a set of worn struts that you'd be replacing soon anyway.

Once you used "throw-aways" as your guinea pig, then you'd know if you want to mod a new set of struts that you're intending to ride the full service life.
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      07-03-2017, 07:16 AM   #74
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measure carefully and think forward.

once you measure,
how worn are your tires? will new tires, same size, be okay? how close is tire and wheel to strut? If it's real close, how will the distance change as you lower strut? what does it mean for future tire choices?

stock wheel and tire sizes should be fine. In my case, I was pretty close to the strut with 18x9 et 31 and 245/35. I might have been okay with that setup, but it was close and it seemed too close for 245/40 or 255/35, so I passed.
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      07-03-2017, 08:54 AM   #75
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Quote:
Originally Posted by terryd5150 View Post
The pinch bolt would probably be strong enough to hold it until you hit the first pothole.
There's no way that tiny piece of sheet-metal, held only by a superficial weld, is the make-or-break for that entire strut assembly as it relates to it's position within the clevis; pothole or not.

Looking forward to hearing what our resident engineers think, but to believe the entire weight of the vehicle literately rests on that small installation tab is pretty far fetched IMO.
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      07-03-2017, 09:03 AM   #76
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Quote:
Originally Posted by FCobra94 View Post
There's no way that tiny piece of sheet-metal, held only by a superficial weld, is the make-or-break for that entire strut assembly as it relates to it's position within the clevis; pothole or not.

Looking forward to hearing what our resident engineers think, but to believe the entire weight of the vehicle literately rests on that small installation tab is pretty far fetched IMO.
I agree with your overall point, that the entire weight of the car doesn't rest on that tab.

The pinch bolt does a good bit of the work but it won't hold the strut stationary all by itself, it needs "assistance" from that tab - or a flared strut tube on other designs.

If you think that's incorrect, you're welcome you to test the theory out, but there's a reason the strut either has that tab or a flare - to prevent downward movement of the strut tube.
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      07-03-2017, 10:08 AM   #77
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I've got plenty of room with the offset and size I'm running, on brand new tires I've measured multiple times. However, I'm running a bit more offset that the average setup (et22) so that contributes.
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      07-03-2017, 11:37 AM   #78
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Quote:
Originally Posted by FCobra94 View Post
There's no way that tiny piece of sheet-metal, held only by a superficial weld, is the make-or-break for that entire strut assembly as it relates to it's position within the clevis; pothole or not.

Looking forward to hearing what our resident engineers think, but to believe the entire weight of the vehicle literately rests on that small installation tab is pretty far fetched IMO.
Not a mechanical engineer but tend to agree. The amount of clamping force the pinch bolt provides can be found from bolt torque clamping force tables. It is not small. The tab is for height alignment during assembly in my opinion.
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      07-03-2017, 11:41 AM   #79
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Quote:
Originally Posted by PhaseP View Post
The tab is for height alignment during assembly in my opinion.
I agree with this as well.
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      07-03-2017, 11:45 AM   #80
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I'll agree too, otherwise you'd see it gouging the aluminum where it rest from taking force, or bending, it's really not a strong piece
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