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Old 05-14-2009, 10:04 AM   #1
oneoverWRX
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Member#: 74793
Join Date: Nov 2004
Location: The Registry
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02 WRX
BLAZE YELLOW

Default Subframe brace + Roll cage questions

Ok, I have a 2002 wrx with a 10pt cage. It is mainly used as a drag car but i am really interested in doing some Track days. I would have posted this in the suspension section but it seemed like i would get a better answer here and from someone with experience.

Questions: I currently have a Perrin Subframe brace on the car for the weight savings but i have considered taking it off. Should I...

Go without a subframe brace, the cage is sufficient?

Leave the perrin, not the greatest brace as i have read but with the cage should be fine?

Go back stock, i need the extra support?

Thanks
Phillip
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Old 05-14-2009, 11:31 AM   #2
MasterKwan
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I'd say initially it won't matter a lick so, I'd change nothing, do some HPDE's and see if you like them. Just upgrade your pads and fluid and have fun.

Keep in mind that most places require that the instructor have the same protection as the driver so, if you have harnesses and seats, you have to have it on both sides. The place I normally track requires real rollbar padding too, not that useless foam pipe insulation.
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Old 07-06-2009, 02:22 AM   #3
cubuff
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Bringing back this topic. I would guess it wouldnt matter one bit about your subframe.

I would take it off and save the weight. you have a 10 point cage that is holding the whole car together. There should be zero flex in your chassis.
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Old 07-06-2009, 03:17 AM   #4
shemoves
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Quote:
Originally Posted by cubuff View Post
Bringing back this topic. I would guess it wouldnt matter one bit about your subframe.

I would take it off and save the weight. you have a 10 point cage that is holding the whole car together. There should be zero flex in your chassis.
Actually, I could see how the subframe and the cage would work well together. The subframe basically connects portions of the front of the car (effectively in front of the cage) to portions in the center of the car that the cage is supporting.

I'll use a pic of the Perrin and a better underbody shot of the GT Spec to explain.

Perrin


GT Spec


The support of the cage basically 'ends' around the middle of the rear sections of the GT Spec braces. One can see; however, that there is a great deal of room for flex in front of that (in all the various suspension components). Adding the Perrin unit would help tie the front section to the middle (where the cage is). Actually, I wonder if adding just a cage would do some unfavorable things to both handling and component longevity. Having just a cage makes the front end absorb much more of the various forces from a system that was originally designed to also have the chassis helping.
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