E9X Half Cage interest

Feb 15, 2017
255
Baltimore
#1
I'm working with local fabricator/mech engineer to look at half cage options for my car. All the options I've found either something I don't like or are too much $$$. We've talked about making a small batch & want some feed back from others to keep in mind. We're thinking 1.75" DOM or chromoly & tig welded. Finishing (paint or pc) would be up to the buyer to keep cost down. Ideally would be as bolt in as possible if demand is there but that will be determined once we're into it.

Who's interested?
Ball park price?
Lose rear seat completely?
Lose seat back keep bottom?
Keep seat?
Finished or Raw?
Other things to incorporate?
 

doublespaces

Administrator
Oct 18, 2016
6,758
AZ
#2
If you're doing a half cage, maybe keep the rear seats?
 

Cheezy

Lieutenant
Nov 7, 2016
553
Toledo Ohio
#3
Im interested. Already ditched rear seat completely. Would like it to be less than 4 digits price point. Harness bar incorporated. Shipped raw.
 

VACust

Corporal
Dec 1, 2016
110
US - Utah
#4
Keep the rear seat if possible. You will have to modify ge side bolsters to keep them but I wouldn’t think it would be that bad to do. Maybe make the rear legs have enough contour so you don’t obstruct the rear 1/4 windows?
 

doublespaces

Administrator
Oct 18, 2016
6,758
AZ
#7
So you can just slip the cross bars out the trunk and put the seat back up and drive normally, right? This would need to be more complicated for a convertible since the fold down seats do not expose the trunk, not like there would be a market for that anyway.
 
Oct 8, 2017
27
#8
Interested. Keep me posted
 

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Corporal
Platinum Vendor
Oct 25, 2016
142
Houston, Texas
#10
The cage won't be very strong since it doesn't have the cross bars intersecting the node of the other bars tube.
Or, perhaps the mounting bracket that is welded at a 90* angle to the tube will be ripped off the face of the tube.
In any case, its a compromise and not an ideal strong solution.
 

doublespaces

Administrator
Oct 18, 2016
6,758
AZ
#11
The cage won't be very strong since it doesn't have the cross bars intersecting the node of the other bars tube.
Or, perhaps the mounting bracket that is welded at a 90* angle to the tube will be ripped off the face of the tube.
In any case, its a compromise and not an ideal strong solution.
Wouldn't it be possible to just weld in another removable bar?
 
Jan 29, 2018
99
#13
seems like ok concept, but cages on street cars... are they willing to include hoop padding and actually design it so its semi safe for the street?
 
Jan 29, 2018
99
#14
human squishy parts dont play well with DOM,,, seen it its bad. But im all for a "safe" cage.
 
Nov 6, 2016
235
N las vegas NV
#15
Interested
Needs harnesss bar
No backseat
Raw finish will make it easier on buyer to color match and on seller about shipping
A 4 point will work for just a roll bar
Preferable it to be certifiable by what ever race event one is doing ie NHRA compliant
 
Jun 4, 2017
840
#16
If you want a half cage, just get specs on the M3 GTS cage and have it copied. You know it was engineered to be safe and meet certs. Then pad it for street use.
 
Nov 6, 2016
235
N las vegas NV
#17
If you want a half cage, just get specs on the M3 GTS cage and have it copied. You know it was engineered to be safe and meet certs. Then pad it for street use.
That'll only work for the E90 not so much for the 92 also just curious but is the m3 wider on the inside or are the specs the same as well
 

doublespaces

Administrator
Oct 18, 2016
6,758
AZ
#19
You'd have to rephrase that going forward, four door coupes are on the rise.
 
Nov 6, 2016
235
N las vegas NV
#20
GTS is a coupe, not a 4 door.
My bad missed the GTS part. But Autopower already makes a decent roll bar. The problem I've seen is the lack of 6 point full cages and fitment there. Most drop before the dashes blocking certain view points where I wouldn't mind cutting the dash for a proper fitting cage
 

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