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Old 04-07-2010, 03:08 PM   #1
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Anybody have aftermarket tunnel brace?

I am wondering if anybody has an aftermarket tunnel brace(the crossmember bracket by the stock h-pipe)??? I just noticed that the stock crossmember bracket is thin and cheap! Are they worth it?? What is the purpose of them?? If theyre worth it whats a good brand to get??
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Old 04-07-2010, 03:27 PM   #2
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I have this one from BMR:



JM
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Old 04-07-2010, 04:39 PM   #3
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I have this one from BMR:



JM
That looks nice but why did you get it? Whats the purpose of them? Do aftermarket braces really work?? Where did you get that brace and how much did you pay?
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Old 04-07-2010, 04:40 PM   #4
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theres a guy here on the forum that made his own and it looked pretty cool
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Old 04-07-2010, 04:42 PM   #5
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I am using the BMR on my car... as are a couple customers. When you combine it with the Sub-Frame connectors it makes a noticeable difference in chassis stiffness. I recommend it if you plan on adding more HP, or really want to improve rearend traction.
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Old 04-07-2010, 04:49 PM   #6
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I am using the BMR on my car... as are a couple customers. When you combine it with the Sub-Frame connectors it makes a noticeable difference in chassis stiffness. I recommend it if you plan on adding more HP, or really want to improve rearend traction.
Whats the difference between the BMR subframe connectors and the Hotchkis chassis brace?? The only difference I see is the price and with the Hotchkis brace you dont have to buy the tunnel brace seperately.
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Old 04-07-2010, 04:50 PM   #7
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Is it worth just buying an aftermarket tunnel brace or should I just invest my money in something like the Hotchkis chassis brace?
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Old 04-07-2010, 04:54 PM   #8
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I'd get the Hotchkis
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Old 04-07-2010, 05:35 PM   #9
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I would go ahead and use the SFCs and the tunnel brace. The brace itself will not make much of a difference, but the two combined, you will feel the difference.
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Old 04-07-2010, 07:52 PM   #10
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I make a CNC machined tunnel brace. Theres a link in my sig to click for pics and more info.
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Old 04-07-2010, 08:24 PM   #11
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I'd get the Hotchkis
+1. I did!!
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Old 04-14-2010, 09:56 AM   #12
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Whats the difference between the BMR subframe connectors and the Hotchkis chassis brace?? The only difference I see is the price and with the Hotchkis brace you dont have to buy the tunnel brace seperately.
BMR is the only company making a subframe connector for the 2010 Camaro. The BMR subframe connector connects the front subframe to the driveshaft tunnel to the rear subframe.

The other chassis brace connects to the rear cradle, not the rear subframe. The problem is that the rear cradle assembly has a bushing between the cradle and the body of the car. As that bushing flexes, the chassis brace flexes as well.

At BMR, we feel that the best way to stiffen the chassis is to connect the subframe connector from one solid point (front subframe) to another solid point (rear subframe). Even better if you can connect to a 3rd solid point (driveshaft tunnel). Other companies stiffen the chassis by connecting a solid point to a flexible point.

By the way, the BMR piece is $150-$200 less expensive as well.

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Old 04-14-2010, 10:20 AM   #13
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I make a CNC machined tunnel brace. Theres a link in my sig to click for pics and more info.
Best one out in my opinion.

Still trying to get one but every week or so something "more important" pops up. lmao

Heard nothing but great from his products and he's a C5 guy....why wouldn't you want to give him the business first?!!

Good luck,
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Old 04-14-2010, 03:00 PM   #14
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If you're asking if JUST a aftermarket tunnel brace is worth it, IMO, no. The forces on it are lateral and the stock plate works ok, for what it is. Yes if you take it off, you can flex it easily, but bolt it up and try it again. It doesn't bend at all. The "humps" molded into it give it more rigidity. A full chassis brace is the best way to go and I think you have to go aftermarket tunnel brace or modify the stock one for use with the BMR brace. Both the BMR and Hotchkis have their strengths. I like that the Hotchkis is no lower than the lowest point already on the car. The BMR does drop down a little but it's not massively significant. If your car is lowered or going to be lowered, this could possibly be an issue.
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Old 04-14-2010, 07:53 PM   #15
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BARTON makes one now......
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Old 04-14-2010, 09:06 PM   #16
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just how stiff does it make the ride???
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Old 04-14-2010, 09:43 PM   #17
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Some have said if you add a 3" exhaust the stock brace creates an annoying vibration. I don't if ths is the case or not, I still have the stock pipes.
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Old 04-14-2010, 10:35 PM   #18
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Best one out in my opinion.

Still trying to get one but every week or so something "more important" pops up. lmao

Heard nothing but great from his products and he's a C5 guy....why wouldn't you want to give him the business first?!!

Good luck,
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Thanks dude!
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Old 04-15-2010, 09:59 AM   #19
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Does the stock tunnel brace qualify as a driveshaft loop? My track requires a driveshaft loop for cars < 13 seconds in the 1/4.
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Old 04-15-2010, 11:01 AM   #20
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Does the stock tunnel brace qualify as a driveshaft loop? My track requires a driveshaft loop for cars < 13 seconds in the 1/4.
No. A driveshaft loop goes around the driveshaft like a bracelet for safety in the event the driveshaft input comes out of the tranny. It will prevent the driveshaft from falling to the ground and severely damaging the car or hurting the driver.
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Old 04-15-2010, 11:16 AM   #21
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No. A driveshaft loop goes around the driveshaft like a bracelet for safety in the event the driveshaft input comes out of the tranny. It will prevent the driveshaft from falling to the ground and severely damaging the car or hurting the driver.
Do you know who sells them...sorry for the thread jack.
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Old 04-15-2010, 11:39 AM   #22
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http://bmrfabrication.com/F5.htm

http://www.mtiracing.com/purchase/20...-by-metco.html
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Old 04-16-2010, 04:50 PM   #23
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Whats the difference between the BMR subframe connectors and the Hotchkis chassis brace?? The only difference I see is the price and with the Hotchkis brace you dont have to buy the tunnel brace seperately.


We like to assess each vehicle and platform through rigorous race track and street testing before coming up with an action plan on how to improve overall driving dynamics. With the 2010 Camaro, we found that it is a remarkably stiff platform. Through both drag race and road course testing we found that the problem with the 5th Gen Camaro is not subframe flex, it's the massive bushings in the rear cradle used by the factory to isolate NVH (noise, vibration and harshness) originally designed for some of the other Zeta platform cars. Those big bushings are great for creating a soft cushy ride, but terrible for performance since they allow the rear suspension cradle to move longitudinally & laterally, hurting both launch from a standstill and overall handling.

Here's a visual:




The Hotchkis Sport Suspension Chassis Max Brace reduces chassis flex and improves traction during hard launches and high-speed cornering by triangulating the rear sub frame to the chassis frame rails. The beauty of the brace is that it stiffens the platform but still allows the bushings to articulate in the vertical axis, so ride quality is not diminished. You get a stable footing and harder launches without the punishing ride of some of the other solutions. It took hundreds of R&D hours and several versions to come up with a brace we were happy with, which is why it works so well.

As for cost, look closely at materials and engineering. Our brace is manufactured from strong, lightweight, aerodynamic elliptical aluminum tubing that we have extruded to our custom spec by Alcoa and mated to laser cut, CNC machined aluminum brackets. We do this for minimal weight, maximum strength, ground clearance and corrosion resistance.

So, with our brace you improve chassis stiffness, launches and overall handling. Improve three things instead of just one, and maintain a decent ride. Plus it’s easy to bolt on, as you can see here:




Hopefully that helps!
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Old 04-16-2010, 06:32 PM   #24
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Some have said if you add a 3" exhaust the stock brace creates an annoying vibration. I don't if ths is the case or not, I still have the stock pipes.
The annoying vibration is when the exhaust is making contact with the tunnel brace. If the exhaust is sitting right on the tunnel brace you'll get a very annoying vibration/drone. It the exhaust doesn't touch the brace but comes real close, then you'll get banging noises when you go over bumps.

I'm running Kook's headers with a Magnaflow catback. I've had to adjust my exhaust a couple times to keep it from making contact with the tunnel brace. Even after making adjustments the exhaust eventually settles back down again (a couple months later) and the exhaust starts hitting the tunnel brace when I go over certain bumps.

So I put several thick washers on each bolt between the stock brace and the car. That gave me about a 1/4'' clearance or so. That's been just enough to keep the exhaust from making contact with brace going over bumps.

But I just recently ordered BMR's tunner brace. I should have it on Monday. They told me it will give me an additional 1/4'' clearance over the stock brace. So I'm pretty confident using a couple washers with the BMR brace will prevent any issues in the future. Plus it will add some rigidity to my frame.
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Old 05-23-2011, 11:02 AM   #25
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The annoying vibration is when the exhaust is making contact with the tunnel brace. If the exhaust is sitting right on the tunnel brace you'll get a very annoying vibration/drone. It the exhaust doesn't touch the brace but comes real close, then you'll get banging noises when you go over bumps.

I'm running Kook's headers with a Magnaflow catback. I've had to adjust my exhaust a couple times to keep it from making contact with the tunnel brace. Even after making adjustments the exhaust eventually settles back down again (a couple months later) and the exhaust starts hitting the tunnel brace when I go over certain bumps.

So I put several thick washers on each bolt between the stock brace and the car. That gave me about a 1/4'' clearance or so. That's been just enough to keep the exhaust from making contact with brace going over bumps.

But I just recently ordered BMR's tunner brace. I should have it on Monday. They told me it will give me an additional 1/4'' clearance over the stock brace. So I'm pretty confident using a couple washers with the BMR brace will prevent any issues in the future. Plus it will add some rigidity to my frame.

How did you make out with the subframe/tunnel and spacing ? I have the 3" borla atak exhaust (w/ kooks headers and high flow cats). I have the rubbing issue on the stock tunnel brace and am curious if the BMR will clear.
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