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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, Apr-01-2017, 03:15:56 AM   #11
TomS2
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Default Re: Rear roll cage

If you don't want it for rollover protection, then get the braces instead. The weight penalty will probably offset the majority of handling improvement you get from stiffening.

You can do one thing good, or two things lousy.
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Old Sat, Apr-01-2017, 03:23:47 AM   #12
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Default Re: Rear roll cage

If you're in Kyoto just bring it to TRA.



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Old Sat, Apr-01-2017, 03:32:48 AM   #13
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Default Re: Rear roll cage

But on a serious note, take a look at most time attack cars in Japan and you'll see the cages are built very thin. You don't really get proper protection unless it's built to FIA standards or close, which many Japanese builders don't adhere to. But since you're talking about a half cage anyway, it's basically just going to be for rollover protection and to act as a harness bar and glorified strut tower bar. You'll need to seriously trim weight to counteract what you'll be adding with the half cage.

IMO go full cage or don't do it at all. You're gonna shell out a small fortune for a NICE custom half cage and it won't really do much for you aside from look cool.
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Old Sat, Apr-01-2017, 03:35:26 AM   #14
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Default Re: Rear roll cage

Also a lot of Japanese time attack builders don't mount their harnesses properly, they just bolt them to the floor. It's allowed but it's really a bad idea. So if you do go with a custom half cage, make sure they build you a proper harness bar with two small hoops to keep your belts in place.
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Old Sat, Apr-01-2017, 11:18:37 AM   #15
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Default Re: Rear roll cage

I paid $1600 for a custom half-cage when my car was streetable. Only half because I will not drive around on the street with a full cage and no helmet. I care about the contents of my skull. Don't tell me this thing didn't firm up the rear half of the car. To me, $1600 was totally worth it to feel safe while harnessed into my car if it rolls.


Now that my car is full-time track, I could get the cage completed, but I don't know if I'm going to actually race with this. The car can be put back to streetable without too much effort at this point. Fully cage it and I can only sell it as a track car.
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Old Sat, Apr-01-2017, 01:47:22 PM   #16
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Default Re: Rear roll cage

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Originally Posted by kyrix1st View Post
I completely agree with you, which is why I'm looking for bolt ins rather than weld in because I'll only be using these when I autox/track the car. I just want more rigidity in the rear during high speed cornering.
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Originally Posted by Solaris99 View Post
I paid $1600 for a custom half-cage when my car was streetable. Only half because I will not drive around on the street with a full cage and no helmet. I care about the contents of my skull. Don't tell me this thing didn't firm up the rear half of the car. To me, $1600 was totally worth it to feel safe while harnessed into my car if it rolls.
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Old Sat, Apr-01-2017, 03:29:43 PM   #17
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Default Re: Rear roll cage

In no way am I saying that a half-cage is half-ultimate protection. It's certainly not worthless, though. This is an example of a little hoop behind the driver's head preventing a possible fatality.
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Old Sun, Apr-02-2017, 03:34:30 PM   #18
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Default Re: Rear roll cage

Quote:
Originally Posted by Nate047 View Post
But on a serious note, take a look at most time attack cars in Japan and you'll see the cages are built very thin. You don't really get proper protection unless it's built to FIA standards or close, which many Japanese builders don't adhere to. But since you're talking about a half cage anyway, it's basically just going to be for rollover protection and to act as a harness bar and glorified strut tower bar. You'll need to seriously trim weight to counteract what you'll be adding with the half cage.

IMO go full cage or don't do it at all. You're gonna shell out a small fortune for a NICE custom half cage and it won't really do much for you aside from look cool.
I disagree that a proper half cage does not help. I hit a concrete wall left front and then rear left at an initial speed of 67mph. The main cabin was not damaged at all. I attribute that to a properly installed Kirk Bar, which helped keep the rear of the car caving-in. Also, the harnesses, eat, HANS, and everything else contributing to me losing my car and not having a single bruise/scratch on me. Kind of crazy... So I do think it helps. I do agree full cages for sure are an order of magnitude better.

Most importantly, my race shop and I both believe that it kept the cabin integrity high enough that the doors were able to open and close without issue.
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Old Sun, Apr-02-2017, 03:43:51 PM   #19
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Default Re: Rear roll cage

I also agree that half cage is better than no cage.
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Old Mon, Apr-03-2017, 12:37:19 AM   #20
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Default Re: Rear roll cage

Also.. one last thing I would like to point out...

IF you are going to go the safety route, you are basically "ruining" the car. To mount harnesses properly, you are going to have to drill a bunch of holes in the chassis. As I converted my M3 to track use, I kept the interior all nice, etc. At the end of the day, there were a ton of holes in the floor for the 1/2 cage and 6 point harness hooks for driver and passenger.
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Discussing Rear roll cage in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)