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Old 01-18-2004, 01:01 PM   #1
ScreaminFast
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89 240 / 90 240

Default sheet metal to cover back seat hole??

My friend, who races bmws at many different events, said that I should probably put a piece of sheet metal over the hole from the rear seats to the trunk. Its to prevent a "parachute" like effect. Have any of you guys with no rear seats done this? If so, whats the best way to do it?
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Old 01-18-2004, 05:59 PM   #2
markf@wrx
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We just built an STi version 6 Group N rally car for a friend of mine and we used a sheet of quarter inch aluminium. We had to profile it around the bottom corners against the wheel arches. It is held in place with about a dozen self tapping screws around the perimeter. I don't know about the parachute effect but I guess it adds a little to the rigidity of the bodyshell.
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Old 01-18-2004, 07:06 PM   #3
ellisnc
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Did someone say track day

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I don't see how that would possibly be true or effect anything. I think the main reason you see it in race cars is there is a fuel cell back there so it's acting as a firewall.

Are you sure he wasn't talking about between the rear axle and rear fascia?

I'm planning on cutting holes in my rear fascia to prevent this at speed.
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Old 01-19-2004, 02:56 PM   #4
Chaste Automotive
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Prodrive as well as us uses Carbon fiber, the sheet adds no structural stability (well if there is any it is negligible) but the main reason we cover it is because the FIA mandates it since we have a fuel cell mounted in the trunk.
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Old 01-19-2004, 04:05 PM   #5
99WNX
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I would also agree with the structural bonuses. The "parachute" effect would probably minimal at best. Wouldn't do any more harm than having an open window in the vehicle.
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Old 01-22-2004, 12:30 PM   #6
ScreaminFast
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Is there any regulations to the size, etc of that? I want to put in something there and then maybe carpet the rear seat area so it would look finished from an interior standpoint...
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Old 01-22-2004, 12:41 PM   #7
Uber Wagon
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Why not just put the sound deadening sheet back that used to be there with the plastic press in bolts. It is probably the lighest thing you can find.
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Old 01-30-2004, 10:36 AM   #8
ScreaminFast
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I don't think that would be FIA legal and I want to try to stay legal if the car makes that next jump in to super-race-car-type-thing-of-science (bill nye the science guy reference)
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