Technical - Sorta: Roll cage design - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dave-ROR · 08-09-2012, 04:06 PM

So another thread went a little OT with roll cage design. Let's see some of your previous/current cages for your race car(s) and design design pros and cons of what we see.

Also, let's use this thread to discuss FRS/BRZ specific rollcage design information.

Dave-ROR · 08-09-2012, 04:07 PM

And I'll start, here's the chump car cage:

Cage was built to meet LeMons, ChumpCar, SCCA and NASA requirements (ie, built to the strongest requirements of each). Seat is mounted to the cage, not the car, and uses a slider system with reinforced pins to allow for adjustment. This car is used for 7-24 hour long races so adjustable was desired to allow different driver sizes, not that we ever actually adjust it...

Thoughts on the design?

ABQautoxer · 08-09-2012, 04:23 PM

FWIW, wasn't the FRS/BRZ dash designed in such a way that it didn't require cutting to install a roll cage? I recall reading that in some of the media during launch.

Dave-ROR · 08-09-2012, 04:26 PM

Quote:

Originally Posted by ABQautoxer

FWIW, wasn't the FRS/BRZ dash designed in such a way that it didn't require cutting to install a roll cage? I recall reading that in some of the media during launch.

You definately have to cut if you want the bars forward as much as possible.. if you like Cusco death cages (or any bolt in cage) you'll have to live with the bars in front of the dash.

icemang17 · 08-12-2012, 07:48 PM

cage design is highly dependant on two things:

1: The race series you plan on racing with requirements
2: The inherent strength-stiffness of the body

Many cars have fairly weak bodies....Many M3's that I race with break all kinds of body parts due to the chassis flex at high G loads....Mustangs are really poor in this area too.....

I don't know how strong-weak the FRS-BRZ platform is, but I would guess its on the weaker end of the spectrum given its light weight.....

If you have a less stiff bodied platform then you build extra reinforcements into the cage to stiffen it up....and pretty much all touring car based racers have cages designed to increase stiffness......

The advantage to a stiff body is using a lighter cage to save overall weight, but of course the stronger body probably is heavier to start with....

A simple test is jacking up 1 front or rear wheel..... when the wheel you are lifting comes off the ground, how close is the opposite side wheel (if there was no droop)....really stiff cars can lift the wheels from the OTHER end....

08-09-2012, 04:06 PM	#1
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	Technical - Sorta: Roll cage design So another thread went a little OT with roll cage design. Let's see some of your previous/current cages for your race car(s) and design design pros and cons of what we see. Also, let's use this thread to discuss FRS/BRZ specific rollcage design information. __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

08-09-2012, 04:07 PM	#2
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	And I'll start, here's the chump car cage: Cage was built to meet LeMons, ChumpCar, SCCA and NASA requirements (ie, built to the strongest requirements of each). Seat is mounted to the cage, not the car, and uses a slider system with reinforced pins to allow for adjustment. This car is used for 7-24 hour long races so adjustable was desired to allow different driver sizes, not that we ever actually adjust it... Thoughts on the design? __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

08-09-2012, 04:23 PM	#3
ABQautoxer Senior Member Join Date: Jun 2012 Drives: 2021 Supra / 2022 Tundra Location: Albuquerque, NM Posts: 659 Thanks: 60 Thanked 197 Times in 141 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	FWIW, wasn't the FRS/BRZ dash designed in such a way that it didn't require cutting to install a roll cage? I recall reading that in some of the media during launch. __________________ TomR

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08-12-2012, 07:48 PM	#5
icemang17 Senior Member Join Date: Jun 2012 Drives: Scion FR-S/ Subaru BRZ Location: Stockton CA Posts: 182 Thanks: 2 Thanked 107 Times in 55 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	cage design is highly dependant on two things: 1: The race series you plan on racing with requirements 2: The inherent strength-stiffness of the body Many cars have fairly weak bodies....Many M3's that I race with break all kinds of body parts due to the chassis flex at high G loads....Mustangs are really poor in this area too..... I don't know how strong-weak the FRS-BRZ platform is, but I would guess its on the weaker end of the spectrum given its light weight..... If you have a less stiff bodied platform then you build extra reinforcements into the cage to stiffen it up....and pretty much all touring car based racers have cages designed to increase stiffness...... The advantage to a stiff body is using a lighter cage to save overall weight, but of course the stronger body probably is heavier to start with.... A simple test is jacking up 1 front or rear wheel..... when the wheel you are lifting comes off the ground, how close is the opposite side wheel (if there was no droop)....really stiff cars can lift the wheels from the OTHER end....

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