FM Frame Rails/Butterfly Brace - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-01-2008, 04:00 PM   #21
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I add just the Rails, and it made a HUGE difference. I had already had an upgraded suspension, front tower brace and a roll bar and even then i noticed a huge difference. even had to remove my rear sway bar because it was so stiff afterwards..
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Old 02-01-2008, 05:00 PM   #22
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I went to a much looser rear sway as well, though I imagine more of that is from the rollbar.

As far as the butterfly part, Mazda put it in it's new cars. It's for those "45*" situations. On turn in, the outer front tire will want to get closer to the inner rear - a brace to help with that natural flexing has to help.
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Old 02-01-2008, 07:17 PM   #23
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Anyone know what gauge the fm rails are?
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Old 02-01-2008, 07:58 PM   #24
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I'm pretty sure its either 16 or 14 gauge aluminum
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Old 02-01-2008, 08:35 PM   #25
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Stainless steel, about 1/8" thick.
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Old 02-02-2008, 03:40 AM   #26
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they dont look like they would be that hard to make, hmmmm
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Old 02-02-2008, 05:56 AM   #27
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The butterfly looks barely welded at all from the pictures on FM's site. I wonder what some quality time with a MIG would do for them.

-Mike
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Old 02-02-2008, 02:41 PM   #28
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Maybe my "butt chassis flex dyno" isn't very sensitive, but I couldn't tell any difference after installing the rails on my ~120k miles chassis.
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Old 02-02-2008, 03:30 PM   #29
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Quote:
Originally Posted by grippgoat View Post
The butterfly looks barely welded at all from the pictures on FM's site. I wonder what some quality time with a MIG would do for them.

-Mike
No point in welding it anymore,the butterfly is stitch welded together.
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Old 02-04-2008, 02:07 PM   #30
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