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914World.com _ 914World Garage _ Rear Trunk Cut Out
Posted by: RobW Apr 21 2012, 07:21 AM
Respectfully, is this a dangerous hack job totally compromising the structure of the car?
Attached thumbnail(s)
Posted by: RobW Apr 21 2012, 07:22 AM
More pictures...
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Posted by: Joe Sharp Apr 21 2012, 07:35 AM
Are you going to get rear-ended on the street? Pertty much what I did to Carerror. I put in a cross brace between the shock towers and back to the dog bone on top of the tranny pick-up points. The build thread is in the Garage, over on NARP under the title Carerror. Let me see if I can find the picture.
Posted by: RobW Apr 21 2012, 08:33 AM
Are you going to get rear-ended on the street? Pertty much what I did to Carerror. I put in a cross brace between the shock towers and back to the dog bone on top of the tranny pick-up points. The build thread is in the Garage, over on NARP under the title Carerror. Let me see if I can find the picture.
Thanks. Not a street car. No windshield.
Posted by: kg6dxn Apr 21 2012, 09:31 AM
Looks like easy access. It's a race car, so fuch it!
Posted by: McMark Apr 21 2012, 09:54 AM
Pretty common modification. Very little (if any) structural effect on the chassis, IMHO.
Posted by: Randal Apr 21 2012, 10:24 AM
The two important structural areas on a 914 in the rear are the shock towers and the transmission cross member.
You can lose the entire floor and the transmission cross member will pretty much stand on it's own.
The shock towers however, to remain solid need to be tied into the roll cage. You can run without them being tied in, but the suspension settings get compromised under load IMHO.
BTW Mark did my trunk and did a great job.
In fact the idea to do your trunk came from Mark's work. 
Posted by: RobW Apr 21 2012, 11:25 AM
Thanks Randal. Great picture. I had a buyer for the race car last night, who had reservations about the rear trunk structurally with the floors gone.
I've seen this modification so many times on race cars that it kind of surprised me.
I would love to collect more experience and pictures to surface any real issue.
Thanks again.
Posted by: SirAndy Apr 21 2012, 12:04 PM
I've seen this modification so many times on race cars that it kind of surprised me.
I would love to collect more experience and pictures to surface any real issue.
Most racecars i have seen have at least additional bracing going down from the shock towers to the rear transmission mount crossbeam.
That ties in and triangulates the tranny mounts with the rest of the chassis.
It also takes care of any potential structural issues in that area.
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Posted by: Randal Apr 21 2012, 12:49 PM
I've seen this modification so many times on race cars that it kind of surprised me.
I would love to collect more experience and pictures to surface any real issue.
Most racecars i have seen have at least additional bracing going down from the shock towers to the rear transmission mount crossbeam.
That ties in and triangulates the tranny mounts with the rest of the chassis.
It also takes care of any potential structural issues in that area.
Yup, good idea.
I'd done it as well, but didn't want to add the additional weight. On the other hand did run bars from the front shock towers to the top of the torsion mountings in front.
Posted by: jimkelly Apr 21 2012, 02:22 PM
i wonder if this negatively effects aerodynamics of the cars at higher speeds.
want to keep the rear down.
jim
Posted by: McMark Apr 21 2012, 03:58 PM
Jim, keep air from getting under the car in the first place. 
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