Subframe connectors? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

zooki · 12-23-2014, 02:19 PM

Does anyone make full length subframe connectors for these cars? Or does the design preclude the fitting of them? I see various braces that either brace the front or the back subframes, but nothing that ties them together. It seem that every unibody type car benefits from tying the two together. Thoughts?

OkieSnuffBox · 12-23-2014, 02:37 PM

Most modern coupes aren't going to benefit from subframe connectors.

It's not something like your Fox-Body that's based on a chassis designed in the late 70s without real FEA work.

Even the S197 Mustang didn't really benefit from subframe connectors and that car was designed over a decade ago. The S550 is even stiff still.

zooki · 12-23-2014, 02:47 PM

I was just wondering since TRD sells those little door jamb thingies. It seems that these chassis' flex a bit watching the videos. If the door is flexing that much it would seem the chassis needs a bit of stiffening.

OkieSnuffBox · 12-23-2014, 02:57 PM

Have any links to the parts/videos you are talking about?

zooki · 12-23-2014, 04:20 PM

Quote:

Originally Posted by OkieSnuffBox

Have any links to the parts/videos you are talking about?

I was reading through this thread:

http://www.ft86club.com/forums/showt...t=28367&page=2

Thee are a couple of videos posted shot from along the door that show it fixing a bit. The second one shows it better.

OkieSnuffBox · 12-24-2014, 02:32 PM

That looks like the door not being 100% solid on the striker vs chassis flex.

mav1178 · 12-24-2014, 03:17 PM

Quote:

Originally Posted by zooki

It seem that every unibody type car benefits from tying the two together. Thoughts?

Yes they do, however you have to look at the big picture.

Doing this will result in (or bring up questions of):
- stiffer chassis
- altered crash/crumple zone characteristics
- lack of ground clearance (even more than before)
- how do you measure this without a review that says "it feels stiffer for sure"?
- Who will pay for the R&D for a functional piece?

Subframe mounting points are easy areas to stiffen up with minimal cost involved (i.e. no one will go out and R&D this, they just usually fab bars that fit/work). To do full unibody bracing, you're much better off seam-welding or fabricating a weld-in cage.

-alex

12-23-2014, 02:19 PM	#1
zooki Senior Member Join Date: Jun 2012 Drives: waiting on a 2021... Location: Texas Posts: 770 Thanks: 190 Thanked 410 Times in 233 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Subframe connectors? Does anyone make full length subframe connectors for these cars? Or does the design preclude the fitting of them? I see various braces that either brace the front or the back subframes, but nothing that ties them together. It seem that every unibody type car benefits from tying the two together. Thoughts? __________________ 2016 4Runner Tail edition 2020 Camry 2020 RAV4 2013 Chevy 3500 4x4 Duramax 1999 Ford F250 Powerstroke, the tow rig 1969 Mustang, the fast car....(:

12-23-2014, 02:47 PM	#3
zooki Senior Member Join Date: Jun 2012 Drives: waiting on a 2021... Location: Texas Posts: 770 Thanks: 190 Thanked 410 Times in 233 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I was just wondering since TRD sells those little door jamb thingies. It seems that these chassis' flex a bit watching the videos. If the door is flexing that much it would seem the chassis needs a bit of stiffening. __________________ 2016 4Runner Tail edition 2020 Camry 2020 RAV4 2013 Chevy 3500 4x4 Duramax 1999 Ford F250 Powerstroke, the tow rig 1969 Mustang, the fast car....(:

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12-23-2014, 02:37 PM	#2
OkieSnuffBox Senior Member Join Date: Aug 2014 Drives: '23 BRZ Limited Location: OKC, OK Posts: 2,089 Thanks: 683 Thanked 1,337 Times in 761 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	Most modern coupes aren't going to benefit from subframe connectors. It's not something like your Fox-Body that's based on a chassis designed in the late 70s without real FEA work. Even the S197 Mustang didn't really benefit from subframe connectors and that car was designed over a decade ago. The S550 is even stiff still.

12-23-2014, 02:57 PM	#4
OkieSnuffBox Senior Member Join Date: Aug 2014 Drives: '23 BRZ Limited Location: OKC, OK Posts: 2,089 Thanks: 683 Thanked 1,337 Times in 761 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	Have any links to the parts/videos you are talking about?

12-24-2014, 02:32 PM	#6
OkieSnuffBox Senior Member Join Date: Aug 2014 Drives: '23 BRZ Limited Location: OKC, OK Posts: 2,089 Thanks: 683 Thanked 1,337 Times in 761 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	That looks like the door not being 100% solid on the striker vs chassis flex.

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