[Tom Droze]

Does anyone have any experience with the Boost Addicts differential lock down brace? They have one for the small differential for the 335i and the 135i, which should fit the small differential on the 328i. I am not certain I would leave it on for daily driving purposes (depending on the increase in NVH) but because the install only takes 15 minutes, it is easily installed for track day purposes. I do have the subframe bushing inserts and the MFactory differential bushings, so it might be overkill. . . but oh the coolness factor!

http://***********ions.com/products/...-for-e9x-335i#

[mmmnot]

Curious as well.

I can't imagine this serving a purpose without high torque and/or LSD.

But then again, I'm assuming.

[Tom Droze]

Originally Posted by mmmnot

Curious as well.

I can't imagine this serving a purpose without high torque and/or LSD.

But then again, I'm assuming.

I have an LSD and I do go to the track occasionally, so. . .

[mmmnot]

Originally Posted by Tom Droze

I have an LSD and I do go to the track occasionally. so. . .

So.

You wanna fight about it?

Actually, I just noticed your signature. How do you like the diff? Was it an entire pumpkin swap out or did you have a shop break it apart?

[Tom Droze]

Originally Posted by mmmnot

So.

You wanna fight about it?

Actually, I just noticed your signature. How do you like the diff? Was it an entire pumpkin swap out or did you have a shop break it apart?

If you were a 335i pinhead, I'd say yes, put up your dukes, but you're not, you're one of us, so no!

I had a shop break it apart to do the install, I believe it cost my about $600 to have it installed. I do feel a difference even when driving it on the street.

Any other questions?

[mmmnot]

Originally Posted by Tom Droze

If you were a 335i pinhead, I'd say yes, put up your dukes, but you're not, you're one of us, so no!

I had a shop break it apart to do the install, I believe it cost my about $600 to have it installed. I do feel a difference even when driving it on the street.

Any other questions?

No. Not relevant to this discussion.

I can't find a local shop confident enough to crack open the diff

[Tom Droze]

Originally Posted by mmmnot

I can't find a local shop confident enough to crack open the diff

There has to be a driveline / differential shop somewhere in Atlanta that can do it. While the BMW differential is technically a non-serviceable differential, MFactory, does sell bearings for it, though I did not replace mine because they were not available at the time of my install and I only had 20,000 miles on the car.

[ajaye]

Originally Posted by Tom Droze

There has to be a driveline / differential shop somewhere in Atlanta that can do it. .

http://www.topspeedtuned.com/ Have you tried them?

[matteblue3er]

I'm not 100% familiar with these diff lock down kits but I'm pretty sure you NA guys do not have enough power to merit the need for it

[Tom Droze]

Originally Posted by matteblue3er

I'm not 100% familiar with these diff lock down kits but I'm pretty sure you NA guys do not have enough power to merit the need for it

Ignorance is bliss!

[hassmaschine]

Waste of money.

[chris82]

Originally Posted by Tom Droze

Ignorance is bliss!

Not ignorant, he's right.

Originally Posted by hassmaschine

Waste of money.

+1 yup

[TheSt|G]

Originally Posted by hassmaschine

Waste of money.

Spot on.

[tinkerputzer]

If you're looking for a sure fire way to transmit drive-line noise this would be it.

[Taskmaster]

Wheel hop sucks, but this looks like it mounts the diff at a second point on the subframe, like the Rogue Dual Ear diff mount did for Z3s. Those where S52 powered cars with similar powerlevels and the comments were pretty positive.

[hassmaschine]

I didn't want to type this on my phone - but basically, that thing does nothing.

Firstly, BMWs have had IRS since what, the 1960s? How exactly does making the diff more rigid make the rear end "more planted"? nonsense - the suspension is attached to the subframe, not the diff.

Second, it doesn't even really stiffen the diff, because if it did, that bracket would fail miserably. Those 4 little bolts are attempting to create a sort of "moment connection". If there were any significant forces through them, they would rip right out of their threads (or shear off). And the flat bar piece is going to be really flimsy along the length of the car (it would just bend at the welds), while the shape of the flat bar is wrong to resist force in the horizontal direction (even seen a flat bar being used as an I beam or tube? nope!) .

All it tells me is with stock bushings, the diff doesn't move much to begin with, because that bracket would fail if it did. And even if it did move a lot, it wouldn't translate into the suspension anyway. Plus, we have pegleg diffs and put down maybe 220wtq. Older BMWs with single ear diff mounts (and LSD) can put down way more than that without any problems.

[hassmaschine]

Originally Posted by TheAxiom

Wheel hop sucks, but this looks like it mounts the diff at a second point on the subframe, like the Rogue Dual Ear diff mount did for Z3s. Those where S52 powered cars with similar powerlevels and the comments were pretty positive.

Z3Ms had single ear diff mounts and the same subframe as the E30. Not even comparable to an E90.

[matteblue3er]

Originally Posted by Tom Droze

Ignorance is bliss!

lol how ironic

[mmmnot]

Originally Posted by matteblue3er

lol how ironic

Kind of like rain, on your wedding day.

[Volasko]

Originally Posted by hassmaschine

All it tells me is with stock bushings, the diff doesn't move much to begin with, because that bracket would fail if it did.

I took the following video, even with upgraded M3 diff mounts the diff does move alot!

[Tom Droze]

Originally Posted by matteblue3er

lol how ironic

Hey matteblue3er, my comment was not in reference to the brace but rather it was in reference to your comment that our N/A cars don't have enough power to merit such a brace. The fact of the matter is, despite my "lack of horsepower" I have experienced substantial wheel hop at the drag strip. And since I do track my car in addition to going to the drag strip, I became curious as to any benefit this brace might provide. And yes I am ignorant with respect to any benefit this type of brace might provide, which is why I asked for feedback from people who are more knowledge than me.

[hassmaschine]

wheel hop is a function of spring & shock stiffness/rebound. making the diff stiffer isn't going to change that.