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BoostAddict BoostAddict is offline
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Default New Differential Lock Down Brace - 09-30-2014, 01:02 PM

Hey everybody,

I haven’t posted here much since the forum was reset as you can tell by my post count. I spend most of my time on bimmerboost now. I just wanted to show you guys a diff lockdown brace I produced. I originally built this as a one off for BuraQ back in 2012. The goal was to have an affordable, durable, and easy installation. The results worked out as expected, minimized wheel hop and created overall tighter rear end.

The brace attaches to the bottom two differential cover bolts, and up to the subframe. No modification/drilling is needed. The subframes have holes there already.

Coming from the 350z and e36 community, it was not uncommon for people to run braces like this with great result. As more people are starting to make big power, I thought it was time to start producing these. The braces are hand made here in the USA out of steel. They are TIG welded, then finished with a black epoxy coating. Epoxy paints are more durable than powder coat. The Braces will also include 304SS hardware. I test fit every single brace made before coating to ensure fitment. That is a testament to how fast and easy installation is.

-Justin


http://boostaddictions.com/products/...e-for-e9x-335i






Notes:

1) 135i Fitment has been confirmed. Also see note 2.

2) Braces for Small differentials are now being produced.

3) For anybody interested in ordering, please confirm that the subframe hole locations are in the same position as marked in red in the picture below.

4) For International Orders please PM me so I can setup a Paypal Invoice and give you a shipping estimate.

Install Video:
http://youtu.be/P1Kwq3p7OzI

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Last edited by BoostAddict; 02-25-2015 at 08:22 AM..
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CHECKERED CHECKERED is offline
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Default 09-30-2014, 01:30 PM

cool

much better then paying $726

Since the driveshaft spins clockwise and wants to pull the right side down and left side up, shouldn’t the support brace go across instead of in an angle?
Like this: Blue arrow stress point, Red arrow jerking motion, Black where cross brace should be
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BoostAddict BoostAddict is offline
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Default 09-30-2014, 01:40 PM

I Appreciate your input. Truthfully the support piece is not even necessary, it's just there for added structural integrity. When we first made this we weren't sure what type of force the brace would see. We just decided to keep it. From a fabrication standpoint, triangles tend to disperse force better, which is why we didn't put the piece like in your diagram. Maybe in the future we'll make one like you mentioned to see if there is any added benefit, as I understand what you mean with rotation.


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Default 09-30-2014, 01:58 PM

Curious to know if this would work on the M3 LSD swapped into my car as well?


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Default 09-30-2014, 02:10 PM

Quote:
Originally Posted by Vertigo
Curious to know if this would work on the M3 LSD swapped into my car as well?
I'm not sure, I haven't been under an M3 in awhile to remember what the diff looks like. I've only been able to confirm fitment on e90/2 335i's with 6at/6mt/DCT


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Default 09-30-2014, 02:42 PM

Nice! Much better than $730.

Good work! What is the turnaround time?


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Default 09-30-2014, 03:16 PM

Quote:
Originally Posted by The Leopard
Nice! Much better than $730.

Good work! What is the turnaround time?
I have 5 ready to ship now, and will have 4 more ready after the weekend.


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Default 09-30-2014, 03:28 PM

weight of the unit?

warranty?

can we see preview of installation instructions?


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Default 09-30-2014, 07:04 PM

You should make one for the front end that also protects the oil pan like the e36 motorsports x brace.


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Default 09-30-2014, 07:53 PM

Quote:
Originally Posted by CHECKERED
weight of the unit?

warranty?

can we see preview of installation instructions?
I've never weighed them but I would say under 3lbs

I'll provide a life time warranty for welds. I can't really provide a warranty for the coating since they can potentially be hit by debris while driving.

The plan this weekend is to put together a short youtube video showing installation using rhino ramps. Trust me it's literally a 5 minute thing once the car is up on ramps.

Quote:
Originally Posted by grinchxvx
You should make one for the front end that also protects the oil pan like the e36 motorsports x brace.
That's not a bad idea. I'll check how much clearance there is between the pan and splash guard next time I'm under the car.


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baggett67 baggett67 is offline
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Default 09-30-2014, 08:14 PM

What are the trade-offs when you lock down the diff? Any known disadvantages to doing this?


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Cloud9Blue Cloud9Blue is offline
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Default 09-30-2014, 08:19 PM

Looks like an effective solution. But it seems like you do have to drill two holes into the rear sub frame.


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Default 09-30-2014, 08:32 PM

Quote:
Originally Posted by baggett67
What are the trade-offs when you lock down the diff? Any known disadvantages to doing this?
What I've noticed is, if you don't have good tires, you'll be spinning them a lot more.

Quote:
Originally Posted by Cloud9Blue
Looks like an effective solution. But it seems like you do have to drill two holes into the rear sub frame.
No drilling is required. We used preexisting holes on the subframe.


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Cloud9Blue Cloud9Blue is offline
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Default 09-30-2014, 09:06 PM

Quote:
Originally Posted by BoostAddict
What I've noticed is, if you don't have good tires, you'll be spinning them a lot more.



No drilling is required. We used preexisting holes on the subframe.
Great! Never notice there were holes on the subframe already. Will have double check if mines has it too. But that would make things a lot easier to install. Guess I just have to coat the bolts and any of the contact surface w/ anti-seize for rust protection during the winter.

Just curious if you guys ever run the kit on a road course too.


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Default 09-30-2014, 11:17 PM

Can this work on a 135 if not any plans to make one
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Default 10-01-2014, 12:16 AM

Quote:
Originally Posted by goldfz8
Can this work on a 135 if not any plans to make one
X2 im down for one if you do


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Default 10-01-2014, 03:38 AM

Quote:
Originally Posted by VegasJD
X2 im down for one if you do
x3. I'll also take one, if you can ship to South Africa.


fuel injection is cool, but i'd rather be blown!
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Default 10-01-2014, 04:14 AM

Very nice idea.


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Default 10-01-2014, 06:03 AM

The bolts are All stainless hardware. So rusting would me minimal to non-existant. Look forward to my diff brace! Gonna install this weekend.
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Default 10-01-2014, 06:33 AM

I haven't tested this on a road course yet. I would like to at some point. I would imagine the results would be similar to having a solid differential bushing.

Yes the hardware is Stainless as BME30 stated. They are marine grade nuts and bolts, so I would imagine they would hold up to the salt they use up north pretty well.

I haven't confirmed 135i fitment yet, but I'm 99% sure its the same thing. If one of you would like to be a tester let me know.

As for international shipping that's no problem. My website is not configured for International customers so we'll just use paypal Invoices for transactions.


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volcom8190 volcom8190 is offline
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Default 10-01-2014, 07:44 AM

Why not bend the part out of one sheet metal piece (10 GA 1018 CRS) and weld a support rib or two onto it. Might be cheaper to manufacture/stronger/easier.

If you can give me mounting point dimensions, ill gladly draw something up as a concept in Solidworks
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davidwarren davidwarren is offline
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Default 10-01-2014, 08:15 AM

any concerns about shearing those two diff bolts?
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Default 10-01-2014, 09:21 AM

Quote:
Originally Posted by volcom8190
Why not bend the part out of one sheet metal piece (10 GA 1018 CRS) and weld a support rib or two onto it. Might be cheaper to manufacture/stronger/easier.

If you can give me mounting point dimensions, ill gladly draw something up as a concept in Solidworks
I wonder how that would be from an aesthetic standpoint. I like that a normal person would never notice the piece as it is now.

Quote:
Originally Posted by davidwarren
any concerns about shearing those two diff bolts?
I'm not gonna say it impossible as they are aluminum, but after 2 years of testing we didn't have any issue with them. I believe the other option also uses the diff bolts, and I haven't heard any reports of issues from their users.


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Cloud9Blue Cloud9Blue is offline
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Default 10-01-2014, 10:11 AM

i don't know if this is different on other cars. But the holes on the rear subframe are much further apart the the bracket on this brace. Also, is this built for the smaller differential pumpkins or the older bigger one


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Last edited by Cloud9Blue; 10-01-2014 at 10:21 AM..
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Cloud9Blue Cloud9Blue is offline
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Default 10-01-2014, 10:32 AM



See this image.


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